CXD2467AQ Просмотр технического описания (PDF) - Sony Semiconductor

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CXD2467AQ

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD2467AQ

Coefficient

b[7:0] 8

Input 10

a[9:0]

a×b

12

c[17:6]

Rounding

and

clipping

10

Output

(g) Gamma bright block

This block performs addition and subtraction processing for the gamma-corrected signal as the bright

adjustment for correcting variance in the VT curve of the LCD panel. 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.

(h) Black frame block

This block can perform processing to fix the blanking period of the video signal to the desired level regardless

of the front-end signal processing results. This is effective when attempting to display a video signal which has

been pixel-converted using a scan converter, etc., on a LCD panel or other display with a fixed number of

pixels. If the number of pixels calculated from the effective period of the video signal to be displayed is less

than the number of pixels of the display on which the signal is to be displayed, the blanking period of the video

signal is displayed in the excess pixels. At this time, the displayed blanking period can be fixed to the desired

level regardless of the gain and bright adjustment, gamma correction or other picture quality adjustment results

by processing with this block.

Here, the desired range of the video signal is replaced with 10-bit data (FRM) by switching the video signal

(port 1 and port 2) and the coefficients using the pulse output from the pulse decoder. This range can be set as

desired by the 11-bit coefficients (H1F, H2F, V1F and V2F) set in the pulse decoder. Then separate pulses are

output from the pulse decoder for each of the port 1 (R1, G1 and B1) and port 2 (R2, G2 and B2) processing

system blocks. By doing so, the black frame display range can be controlled in 1-dot units for the horizontal

direction and in 1-line units for the vertical direction. Note that the 1-dot unit for the horizontal direction is the 1-

dot unit when viewed with the video signal displayed. Also, all coefficients are shared by R, G and B, and the

initial value is 000h for each. However, note that when all black frame display range coefficients (H1F, H2F,

V1F and V2F) are 000h, black frame display processing is not performed regardless of the black frame signal

level coefficient values.

Internal HD

Internal VD

Internal MCLK

Pulse

decoder

11

Horizontal direction display range (H1F)

11

Horizontal direction display range (H2F)

11

Vertical direction display range (V1F)

11

Vertical direction display range (V2F)

Input (port 1) 10

Coefficient (FRM) 10

Selector

10

Output (port 1)

Input (port 2) 10

10

Selector

– 19 –

Output (port 2)

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