Compressive overdrive circuit and associated method

1. A compressive overdrive circuit, comprising:

a compression unit, for compressing a current frame to generate compressed data for buffering, where the compressed data comprises pixel values of a plurality of non-encoded pixels and a plurality of index values associated with the non-encoded pixels; and

a decompression unit, for decompressing according to the pixel values of the non-encoded pixels and the index values to generate data of a previous frame;

wherein the overdrive circuit performs overdrive processing according to the current frame and the previous frame.

2. The overdrive circuit of claim 1 , wherein the compressed data further comprises a plurality of blending values, and the blending values and the index values are encoded data of a plurality of encoded pixels, and the decompression unit decompresses the encoded data according to the blending values, the pixel values of the non-encoded pixels and the index values.

3. The overdrive circuit of claim 2 , wherein each encoded data of each encoded pixel comprises a blending value and two index values; and the decompression unit generates pixel values of the encoded pixels by blending the pixel values of the non-encoded pixels represented by the two index values according to the bending value.

4. The overdrive circuit of claim 3 , wherein the two index values are equal and both represent a most resembling pixel neighboring to the encoded pixels.

5. The overdrive circuit of claim 3 , wherein the two index values are different and respectively represent a most resembling pixel and a secondary resembling pixel neighboring to the encoded pixels.

6. The overdrive circuit of claim 1 , further comprising:

a data transformer, for performing overdrive processing according to the pixel values of the current frame and a plurality of most significant bits of the pixel values of the previous frame.

7. The overdrive circuit of claim 6 , further comprising:

two luminance calculators, coupled to the compression unit and the decompression unit respectively and the two luminance calculators both coupled to the data transformer, for calculating luminance for the two frames respectively according to the pixel values of the current frame and the most significant bits of the pixel values of the previous frame to perform overdrive processing.

8. The overdrive circuit of claim 1 , further comprising:

a buffer, coupled to the compression unit and the decompression unit, for buffering the compressed data.

9. A method of compressive overdrive, comprising:

compressing a current frame to generate compressed data for buffering, where the compressed data comprises pixel values of a plurality of non-encoded pixels and a plurality of index values associated with the non-encoded pixels;

decompressing according to the pixel values of the non-encoded pixels and the index values to generate data of a previous frame; and

performing overdrive processing according to the current frame and the previous frame.

10. The overdrive method of claim 9 , wherein the compressed data comprises a plurality of blending values, and the blending values and the index values are encoded data of a plurality of encoded pixels, and the step of decompressing further comprises decompressing according to the blending values, the pixel values of the non-encoded pixels and the index values.

11. The overdrive method of claim 9 , wherein each encoded data of each encoded pixel comprises a blending value and two index values; and the decompressing step generates pixel values of the encoded pixels by blending the pixel values of the non-encoded pixels represented by the two index values according to the blending value.

12. The overdrive method of claim 11 , wherein the two index values are equal and both represent a most resembling pixel neighboring to the encoded pixels.

13. The overdrive method of claim 11 , wherein the two index values are different and respectively represent a most resembling pixel and a secondary resembling pixel neighboring to the encoded pixels.

14. The overdrive method of claim 9 , wherein the step of performing overdrive processing further comprises:

performing overdrive processing according to the pixel values of the current frame and a plurality of most significant bits of the pixel values of the previous frame.

15. The overdrive method of claim 9 , further comprising:

calculating luminance for the two frames according to the pixel values of the current frame and the most significant bits of the pixel values of the previous frame to perform overdrive processing.

16. The overdrive method of claim 9 , further comprising:

buffering the compressed data.