1. A front-end processing circuit preceding a panel driving circuit, coupled to and preceding the panel driving circuit, the front-end processing circuit comprising:

the sub-pixel rendering module is used for receiving a first signal, performing sub-pixel rendering processing on the first signal and outputting a second signal; and

and the compensation module is respectively coupled with the sub-pixel rendering module and the panel driving circuit and is used for outputting a third signal to the panel driving circuit after performing compensation processing on the second signal.

2. The front-end processing circuit before the panel driving circuit of claim 1, wherein the compensation module is an overdrive module and the compensation process is an overdrive compensation process.

3. The front-end processing circuit before the panel driving circuit of claim 1, wherein the compensation module is a de-branding module and the compensation process is a de-branding compensation process.

4. The front-end processing circuit before the panel driving circuit as claimed in claim 1, wherein the compensation module is a de-mura module and the compensation process is a de-mura compensation process.

5. The front-end processing circuit before the panel driving circuit of claim 1, wherein the compensation module comprises an overdrive unit and a de-branding unit and the compensation process comprises an overdrive compensation process and a de-branding compensation process.

6. The front-end processing circuit of claim 5, wherein the overdrive unit is coupled between the sub-pixel rendering module and the de-branding unit or the de-branding unit is coupled between the sub-pixel rendering module and the overdrive unit.

7. The front-end processing circuit of claim 1, wherein the compensation module comprises an overdrive unit and a de-mura unit and the compensation process comprises an overdrive compensation process and a de-mura compensation process.

8. The front-end processing circuit of claim 7, wherein the overdrive unit is coupled between the sub-pixel rendering module and the de-mura unit or the de-mura unit is coupled between the sub-pixel rendering module and the overdrive unit.

9. The front-end processing circuit of claim 1, wherein the compensation module comprises a de-branding unit and a de-mura unit and the compensation process comprises a de-branding compensation process and a de-mura compensation process.

10. The front-end processing circuit of claim 9, wherein the de-branding unit is coupled between the sub-pixel rendering module and the de-mura unit or the de-mura unit is coupled between the sub-pixel rendering module and the de-branding unit.

11. The front-end processing circuit of claim 1, wherein the compensation module comprises an overdrive unit, a de-branding unit and a de-mura unit and the compensation process comprises an overdrive compensation process, a de-branding compensation process and a de-mura compensation process.

12. The front-end processing circuit of claim 11, wherein the overdrive unit, the de-branding unit, and the de-mura unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

13. The front-end processing circuit of claim 11, wherein the overdrive unit, the de-mura unit and the de-branding unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

14. The front-end processing circuit of claim 11, wherein the de-branding unit, the over-driving unit and the de-mura unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

15. The front-end processing circuit of claim 11, wherein the de-branding unit, the de-mura unit and the overdrive unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

16. The front-end processing circuit of claim 11, wherein the de-luminance-unevenness unit, the over-driving unit and the de-branding unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

17. The front-end processing circuit of claim 11, wherein the de-mura unit, the de-branding unit, and the overdrive unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

18. The front-end processing circuit before the panel driving circuit of claim 1, wherein the panel driving circuit is coupled to and drives an organic light emitting diode panel.

Background

Generally, the oled panel may cause some display problems during the manufacturing or using process, such as uneven brightness (Mura), Burn-in (Burn-in), ghost shadow or smear. Conventionally, the panel driving circuit can respectively eliminate the display problems through different compensation mechanisms, such as brightness unevenness removal (Demura), burn-in removal (De-burn in) or Over-drive (Over-drive).

However, no matter what compensation mechanism is adopted by the panel driving circuit, a considerable operation burden is caused, and the panel driving circuit needs to store numerous data such as compensation data, panel usage or a difference of pictures at each point in previous and next frames, so that the originally built-in memory of the panel driving circuit is not used, and the memory capacity needs to be additionally increased, thereby greatly increasing the cost of the panel driving circuit, and requiring improvement.

Disclosure of Invention

Accordingly, the present invention is directed to a front-end processing circuit in front of a panel driving circuit to effectively solve the above-mentioned problems encountered in the prior art.

One embodiment according to the present invention is a front-end processing circuit. In this embodiment, the front-end processing circuit is coupled to and before the panel driving circuit. The front-end processing circuit includes a Sub-Pixel Rendering (SPR) module and a compensation module. The sub-pixel rendering module is used for receiving the first signal, performing sub-pixel rendering processing on the first signal and outputting a second signal. The compensation module is respectively coupled with the sub-pixel rendering module and the panel driving circuit and is used for outputting a third signal to the panel driving circuit after the second signal is compensated.

In one embodiment, the compensation module is an Overdrive (Overdrive) module and the compensation process is an Overdrive compensation process.

In one embodiment, the compensation module is a De-burn-in module and the compensation process is a De-burn-in compensation process.

In one embodiment, the compensation module is a de-mura (Demura) module and the compensation process is a de-mura compensation process.

In one embodiment, the compensation module includes an overdrive unit and a de-branding unit and the compensation process includes an overdrive compensation process and a de-branding compensation process.

In one embodiment, the overdrive unit is coupled between the sub-pixel rendering module and the de-branding unit or the de-branding unit is coupled between the sub-pixel rendering module and the overdrive unit.

In one embodiment, the compensation module includes an overdrive unit and a brightness unevenness removal unit, and the compensation process includes an overdrive compensation process and a brightness unevenness removal compensation process.

In one embodiment, the overdrive unit is coupled between the sub-pixel rendering module and the brightness unevenness removing unit or the brightness unevenness removing unit is coupled between the sub-pixel rendering module and the overdrive unit.

In one embodiment, the compensation module includes a de-branding unit and a de-luminance-unevenness unit and the compensation process includes a de-branding compensation process and a de-luminance-unevenness compensation process.

In one embodiment, the de-branding unit is coupled between the sub-pixel rendering module and the de-uneven brightness unit or the de-uneven brightness unit is coupled between the sub-pixel rendering module and the de-branding unit.

In one embodiment, the compensation module includes an overdrive unit, a de-branding unit, and a de-luminance-unevenness unit, and the compensation process includes an overdrive compensation process, a de-branding compensation process, and a de-luminance-unevenness compensation process.

In one embodiment, the over-driving unit, the de-branding unit and the uneven brightness removing unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the over-driving unit, the uneven brightness removing unit and the burn-in removing unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the de-branding unit, the over-driving unit and the uneven brightness removing unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the de-branding unit, the de-uneven brightness unit and the over-driving unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the brightness unevenness removing unit, the overdrive unit and the de-branding unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the brightness unevenness removing unit, the burn-in removing unit and the overdrive unit are sequentially coupled between the sub-pixel rendering module and the panel driving circuit.

In one embodiment, the panel driving circuit is coupled to and drives an Organic Light Emitting Diode (OLED) panel.

Compared with the prior art, the invention discloses a front-end processing circuit before a panel driving circuit, which is used for firstly carrying out sub-pixel rendering (SPR) processing on an input image signal and then carrying out other related compensation processing (such as de-branding compensation, de-uneven brightness compensation, overdrive compensation and the like) so as to provide the image signal after the compensation processing to the panel driving circuit for driving an organic light-emitting diode panel to display a picture, thereby greatly reducing the memory capacity and the operation burden required by the panel driving circuit and enabling the organic light-emitting diode panel to provide the best display efficiency.

The advantages and spirit of the present invention can be further understood by the following detailed description of the invention and the accompanying drawings.

Drawings

Fig. 1 to 8F are schematic diagrams of front-end processing circuits according to different embodiments of the present invention.

Fig. 9A to 9C are schematic diagrams of an overdrive module, a de-branding module and a brightness nonuniformity removal module in the front-end processing circuit, respectively.

Description of the main element symbols:

1 front-end processing circuit 10 sub-pixel rendering module

12 compensation module PD panel drive circuit

S1 first signal S2 second signal

S3 third signal 2 front-end processing circuit

20 subpixel rendering module 22 overdrive module

3 front-end processing circuit 30 sub-pixel rendering module

32 remove front-end processing circuit of brand module 4

40 sub-pixel rendering module 42 uneven brightness removing module

5A front-end processing circuit 50A sub-pixel rendering module

52A compensation module 520A overdrive unit

522A brand-removing unit 5B front-end processing circuit

50B sub-pixel rendering module 52B compensation module

520B De-branding Unit 522B overdrive Unit

6A front-end processing circuit 60A sub-pixel rendering module

62A compensation module 620A overdrive unit

622A brightness unevenness removing unit 6B front end processing circuit

60B sub-pixel rendering module 62B compensation module

620B luminance unevenness removing unit 622B overdrive unit

7A front-end processing circuit 70A sub-pixel rendering module

72A compensation module 720A de-branding unit

722A brightness unevenness removing unit 7B front-end processing circuit

70B sub-pixel rendering module 72B compensation module

720B brightness unevenness removing unit 722B burn-in removing unit

8A front-end processing circuit 80A sub-pixel rendering module

82A compensation module 820A overdrive unit

822A brand removing unit 824A uneven brightness removing unit

8B front-end processing circuit 80B sub-pixel rendering module

82B compensation module 820B overdrive unit

822B uneven brightness removing unit 824B brand removing unit

8C front-end processing circuit 80C sub-pixel rendering module

82C compensation module 820C de-branding unit

822C overdrive unit 824C brightness unevenness removing unit

8D front-end processing circuit 80D sub-pixel rendering module

82D compensation module 820D de-branding unit

822D brightness unevenness removing unit 824D overdrive unit

8E front-end processing circuit 80E sub-pixel rendering module

82E compensation module 820E brightness unevenness removing unit

822E over-drive unit 824E de-branding unit

8F front-end processing circuit 80F sub-pixel rendering module

82F compensation module 820F brightness unevenness removing unit

822F brand removing unit 824F overdrive unit

9A overdrive module 90A memory

92A overdrive compensation calculating unit 94A data merging unit

D1 data Signal D2 data Signal

D3 data signal 9B de-branding module

90B De-branding calculation Unit 92B memory

De-branding compensation unit for 94B non-volatile memory 96B

98B data merge unit D4 data signal

9C uneven brightness removing module 90C uneven brightness removing compensation unit

92C memory 94C non-volatile memory

96C data merging unit

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.

One embodiment according to the present invention is a front-end processing circuit. In this embodiment, the output terminal of the front-end processing circuit is coupled to the input terminal of the panel driving circuit, i.e. the front-end processing circuit is located in front of the panel driving circuit. The panel driving circuit may be used to drive a panel (e.g., an organic light emitting diode panel) to display a picture, but not limited thereto. In practical applications, the front-end Processing circuit may be a Central Processing Unit (CPU), but is not limited thereto.

Referring to fig. 1, fig. 1 is a schematic diagram of a front-end processing circuit in this embodiment. As shown in fig. 1, the front-end processing circuit 1 is coupled to and located before the panel driving circuit PD. The front-end processing circuit 1 comprises a sub-pixel rendering module 10 and a compensation module 12. The sub-pixel rendering module 10 is configured to receive a first signal (for example, but not limited to, an original image signal) S1, perform sub-pixel rendering (SPR) processing on the first signal S1, and output a second signal (for example, but not limited to, an SPR processed image signal) S2. The compensation module 12 is coupled to the sub-pixel rendering module 10 and the panel driving circuit PD, respectively, for performing compensation processing on the second signal S2 and outputting a third signal (for example, but not limited to, an image signal after compensation processing) S3 to the panel driving circuit PD, so that the panel driving circuit PD drives an organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 2, the front-end processing circuit 2 includes a sub-pixel rendering module 20 and an Overdrive (Overdrive) module 22. The sub-pixel rendering module 20 is configured to receive the first signal S1 and output a second signal S2 after performing a sub-pixel rendering process on the first signal S1. The overdrive module 22 is coupled to the sub-pixel rendering module 20 and the panel driving circuit PD, respectively, for performing overdrive compensation on the second signal S2 and outputting a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD drives an organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 3, the front-end processing circuit 3 includes a sub-pixel rendering module 30 and a De-burn-in module 32. The sub-pixel rendering module 30 is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-branding module 32 is coupled to the sub-pixel rendering module 30 and the panel driving circuit PD, respectively, for performing de-branding compensation processing on the second signal S2 and outputting a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD drives an organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 4, the front-end processing circuit 4 comprises a sub-pixel rendering module 40 and a de-mura (Demura) module 42. The sub-pixel rendering module 40 is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The brightness unevenness removing module 42 is coupled to the sub-pixel rendering module 40 and the panel driving circuit PD, respectively, for performing brightness unevenness removing compensation on the second signal S2 and outputting a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD drives an organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 5A, the front-end processing circuit 5A comprises a sub-pixel rendering module 50A and a compensation module 52A. The compensation module 52A includes an overdrive unit 520A and a de-branding unit 522A. The sub-pixel rendering module 50A is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The overdrive unit 520A is coupled between the sub-pixel rendering module 50A and the de-branding unit 522A. The overdrive unit 520A and the de-branding unit 522A sequentially perform overdrive compensation and de-branding compensation on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD drives the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 5B, the front-end processing circuit 5B comprises a sub-pixel rendering module 50B and a compensation module 52B. The compensation module 52B includes a de-branding unit 520B and an overdrive unit 522B. The sub-pixel rendering module 50B is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-branding unit 520B is coupled between the sub-pixel rendering module 50B and the overdrive unit 522B. The de-branding unit 520B and the over-driving unit 522B sequentially perform de-branding compensation processing and over-driving compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 6A, the front-end processing circuit 6A comprises a sub-pixel rendering module 60A and a compensation module 62A. The compensation module 62A includes an overdrive unit 620A and a de-mura unit 622A. The sub-pixel rendering module 60A is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The overdrive unit 620A is coupled between the sub-pixel rendering module 60A and the de-luminance-unevenness unit 622A. The overdrive unit 620A and the brightness unevenness removing unit 622A sequentially perform overdrive compensation and brightness unevenness removing compensation on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 6B, the front-end processing circuit 6B comprises a sub-pixel rendering module 60B and a compensation module 62B. The compensation module 62B includes a de-mura unit 620B and an overdrive unit 622B. The sub-pixel rendering module 60B is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-mura unit 620B is coupled between the sub-pixel rendering module 60B and the overdrive unit 622B. The uneven brightness removing unit 620B and the overdrive unit 622B sequentially perform uneven brightness removing compensation processing and overdrive compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 7A, the front-end processing circuit 7A comprises a sub-pixel rendering module 70A and a compensation module 72A. The compensation module 72A includes a de-branding unit 720A and a de-uneven brightness unit 722A. The sub-pixel rendering module 70A is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-branding unit 720A is coupled between the sub-pixel rendering module 70A and the de-uneven brightness unit 722A. The de-branding unit 720A and the de-luminance unevenness unit 722A sequentially perform de-branding compensation processing and de-luminance unevenness compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD for the panel driving circuit PD to drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 7B, the front-end processing circuit 7B comprises a sub-pixel rendering module 70B and a compensation module 72B. The compensation module 72B includes a brightness unevenness removing unit 720B and a burn-in removing unit 722B. The sub-pixel rendering module 70B is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-uneven brightness unit 720B is coupled between the sub-pixel rendering module 70B and the de-branding unit 722B. The brightness unevenness removing unit 720B and the burn-in removing unit 722B sequentially perform brightness unevenness removing compensation processing and burn-in removing compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD for the panel driving circuit PD to drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 8A, the front-end processing circuit 8A includes a sub-pixel rendering module 80A and a compensation module 82A. The compensation module 82A includes an overdrive unit 820A, a de-branding unit 822A, and a de-uneven brightness unit 824A. The over-driving unit 820A, the de-branding unit 822A and the de-uneven brightness unit 824A are sequentially coupled between the sub-pixel rendering module 80A and the panel driving circuit PD. The sub-pixel rendering module 80A is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The overdrive unit 820A, the de-branding unit 822A and the de-uneven brightness unit 824A sequentially perform overdrive compensation, de-branding compensation and de-uneven brightness compensation on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 8B, the front-end processing circuit 8B includes a sub-pixel rendering module 80B and a compensation module 82B. The compensation module 82B includes an overdrive unit 820B, a de-luminance-unevenness unit 822B, and a de-branding unit 824B. The overdrive unit 820B, the de-luminance-unevenness unit 822B and the de-branding unit 824B are sequentially coupled between the sub-pixel rendering module 80B and the panel driving circuit PD. The sub-pixel rendering module 80B is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The overdrive unit 820B, the brightness unevenness removing unit 822B and the burn-in removing unit 824B sequentially perform overdrive compensation, brightness unevenness removing compensation and burn-in removing compensation on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 8C, front-end processing circuit 8C includes a sub-pixel rendering module 80C and a compensation module 82C. The compensation module 82C includes a de-branding unit 820C, an overdrive unit 822C, and a de-luminance-unevenness unit 824C. The de-branding unit 820C, the over-driving unit 822C and the brightness unevenness removing unit 824C are sequentially coupled between the sub-pixel rendering module 80C and the panel driving circuit PD. The sub-pixel rendering module 80C is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-branding unit 820C, the over-driving unit 822C and the brightness unevenness removing unit 824C sequentially perform de-branding compensation processing, over-driving compensation processing and brightness unevenness removing compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in fig. 8D, the front-end processing circuit 8D includes a sub-pixel rendering module 80D and a compensation module 82D. The compensation module 82D includes a de-branding unit 820D, a de-luminance-unevenness unit 822D, and an overdrive unit 824D. The de-branding unit 820D, the de-brightness-unevenness unit 822D and the over-driving unit 824D are sequentially coupled between the sub-pixel rendering module 80D and the panel driving circuit PD. The sub-pixel rendering module 80D is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The de-branding unit 820D, the de-luminance-unevenness unit 822D and the over-driving unit 824D sequentially perform de-branding compensation processing, de-luminance-unevenness compensation processing and over-driving compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 8E, the front-end processing circuit 8E includes a sub-pixel rendering module 80E and a compensation module 82E. The compensation module 82E includes a brightness unevenness removing unit 820E, an overdrive unit 822E, and a de-branding unit 824E. The uneven brightness elimination unit 820E, the over-driving unit 822E and the de-branding unit 824E are sequentially coupled between the sub-pixel rendering module 80E and the panel driving circuit PD. The sub-pixel rendering module 80E is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The uneven brightness removing unit 820E, the overdrive unit 822E and the burn-in removing unit 824E sequentially perform uneven brightness removing compensation processing, overdrive compensation processing and burn-in removing compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in FIG. 8F, the front-end processing circuit 8F includes a sub-pixel rendering module 80F and a compensation module 82F. The compensation module 82F includes a brightness unevenness removing unit 820F, a burn-in removing unit 822F, and an overdrive unit 824F. The uneven brightness elimination unit 820F, the burn-in elimination unit 822F and the overdrive unit 824F are sequentially coupled between the sub-pixel rendering module 80F and the panel driving circuit PD. The sub-pixel rendering module 80F is configured to receive the first signal S1 and output a second signal S2 after performing sub-pixel rendering processing on the first signal S1. The brightness unevenness removing unit 820F, the burn-in removing unit 822F and the overdrive unit 824F sequentially perform brightness unevenness removing compensation processing, overdrive compensation processing and burn-in removing compensation processing on the second signal S2, and then output a third signal S3 to the panel driving circuit PD, so that the panel driving circuit PD can drive the organic light emitting diode panel (not shown) to display a picture.

In another embodiment, as shown in fig. 9A, the overdrive module 9A in the front-end processing circuit includes a memory 90A, an overdrive compensation calculating unit 92A and a data merging unit 94A. The memory 90A is coupled to the overdrive compensation calculation unit 92A. The overdrive compensation calculating unit 92A is coupled to the data merging unit 94A. When the overdrive module 9A receives the data signal D1, the memory 90A is used for storing the data signal D1. The overdrive compensation calculating unit 92A is used for performing overdrive compensation calculation according to the data signal D1 to output a data signal D2. The data merging unit 94A is used for merging the data signals D1 and D2 to output a data signal D3.

In another embodiment, as shown in FIG. 9B, the de-branding module 9B of the front-end processing circuit includes a de-branding calculation unit 90B, a memory 92B, a non-volatile memory 94B, a de-branding compensation unit 96B, and a data merge unit 98B. The memory 92B is coupled to the de-branding calculation unit 90B and the de-branding compensation unit 96B, respectively. The de-branding compensation calculation unit 96B is coupled to the data merging unit 98B. When the de-branding module 9B receives the data signal D1, the de-branding calculation unit 90B performs de-branding calculation according to the data signal D1 to output a data signal D2. The memory 92B is used for storing the data signal D2 and transmitting it to the nonvolatile memory 94B for storage. The de-branding compensation unit 96B performs de-branding compensation according to the data signal D2 to output a data signal D3. The data merge unit 98B is used for merging the data signals D1 and D3 to output the data signal D4.

In another embodiment, as shown in fig. 9C, the uneven brightness elimination module 9C in the front-end processing circuit includes an uneven brightness elimination compensation unit 90C, a memory 92C, a non-volatile memory 94C and a data merging unit 96C. The memory 92C is coupled to the brightness unevenness compensation unit 90C and the non-volatile memory 94C, respectively. The de-luminance unevenness compensating unit 90C is coupled to the data merging unit 96C. When the uneven brightness elimination module 9C receives the data signal D1, the uneven brightness elimination compensation unit 90C is used for carrying out uneven brightness elimination compensation according to the data signals D1 and D2 to output a data signal D3. The data merge unit 96C is used for merging the data signals D1 and D3 and outputting the data signal D4.

In practical applications, the sequence of the overdrive, burn-in removal and/or brightness unevenness compensation performed by the front-end processing circuit can be adjusted or added or deleted according to practical requirements, and is not limited to the above embodiments.

It should be noted that, in the above embodiments, the front-end processing circuit located in front of the panel driving circuit performs sub-pixel rendering (SPR) processing on the original image signal, and then performs one or more compensation processing procedures of overdrive, burn-in removal and/or brightness removal unevenness for improving the phenomena of image sticking, smear, burn-in, brightness unevenness, etc. to provide the compensated image signal to the panel driving circuit, so that the panel driving circuit does not need to adopt a large amount of memory space of a low-voltage process under a high-voltage integration process, and does not need to arrange a flash memory in the limited space, thereby effectively saving the space and cost of the panel driving circuit. In addition, since sub-pixel rendering (SPR) processing is already performed in the front-end processing circuit located before the panel driving circuit, the amount of data transmission between the front-end processing circuit and the panel driving circuit can be relatively reduced to save power consumption.

Compared with the prior art, the invention discloses a front-end processing circuit before a panel driving circuit, which is used for firstly carrying out sub-pixel rendering (SPR) processing on an input image signal and then carrying out other related compensation processing (such as de-branding compensation, de-uneven brightness compensation, overdrive compensation and the like) so as to provide the image signal after the compensation processing to the panel driving circuit for driving an organic light-emitting diode panel to display a picture, thereby greatly reducing the memory capacity and the operation burden required by the panel driving circuit and enabling the organic light-emitting diode panel to provide the best display efficiency.