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CXD2467Q

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD2467Q

(c) Sub gain block

This block performs multiplication processing as the white balance gain adjustment. Multiplication is performed

as follows using the 10-bit data a[9:0] output from the user bright block and an 8-bit coefficient b[7:0] as inputs.

c[17:0] = a[9:0] × b[7:0]

The upper 13 bits c[17:5] of the arithmetic results are output. Next, the c[5] value is checked and rounding is

performed to 12 bits. Further, the upper 2 bits of the rounded 12 bits are checked, clipping is performed to

prevent overflow, and the lower 10 bits are output. Note that since the coefficient has 8 bits and the 6th bit of

the arithmetic results is rounded, the maximum gain by this operation is 255/64 = 3.984375 times and this can

be varied in 256 steps. The arithmetic coefficients can be set independently for R, G and B, and the initial

value is 040h for each.

Coefficient

b[7:0] 8

Input 10

a[9:0]

a×b

13

c[17:5]

Rounding

and

clipping

10

Output

(d) Sub bright block

This block performs addition and subtraction processing as the white balance bright adjustment. Note that the

block configuration is the same as the user bright block. However, the arithmetic coefficients and codes can be

set independently for R, G and B, and the initial values are 000h and 0h for each, respectively.

(e) Gamma block

This block performs gamma correction for the user- and white balance-adjusted signal. This block comprises a

10-bit × 1024-word RAM, and the gamma correction curve can be set as desired. The results of this correction

are output as 10 bits. The RAM data is set through the parallel I/F block. Note that the RAM output is

undetermined while data is being set in this RAM, and also during power-on.

Input 10

RAM

10

10bit × 1024 word

Output

(f) Gamma gain block

This block performs multiplication processing for the gamma-corrected signal as the gain adjustment for

correcting variance in the VT curve of the LCD panel. Multiplication is performed as follows using the 10-bit

data a[9:0] output from the gamma block and an 8-bit coefficient b[7:0] as inputs.

c[17:0] = a[9:0] × b[7:0]

The upper 12 bits c[17:6] of the arithmetic results are output. Next, the c[6] value is checked and rounding is

performed to 11 bits. Further, the MSB of the rounded 11 bits is checked, clipping is performed to prevent

overflow, and the lower 10 bits are output. Note that since the coefficient has 8 bits and the 7th bit of the

arithmetic results is rounded, the maximum gain by this operation is 255/128 = 1.9921875 times and this can

be varied in 256 steps. The arithmetic coefficients can be set independently for R, G and B, and the initial

value is 080h for each.

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