ADE3700XT datasheet(60/89 Pages) STMICROELECTRONICS

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sRGB

ADE3700

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2.14

sRGB

The sRGB block performs two primary functions:

1. Parametric gamma correction on multiple windows or full screen, used for video enhancement

in a window and digital contrast/brightness control. The window coordinates are set by TCON

registers.

2. 3D color cube warping RGB color space.

2.14.1 Parametric Gamma, Digital Contrast / Brightness on Multiple Windows

The function can be applied to the entire window by programming the window control to full screen.

Each color channel acts independently. Simple digital contrast and brightness can be programmed

using this hardware function. The desired window coordinates are programmed into the TCON.

2.14.2 Color Space Warp

The 8 corners of the color cube are independently controlled in 3D space with smooth interpolation

of intermediate colors. Registers are 2’s complement color delta’s. For example, to make WHITE

more like RED, program SRGB_WHITE_R to a small positive value.

Figure 8: Color Space Warp

Table 20: sRGB Registers (Sheet 1 of 3)

Addr

Mode

Bits

Default

Description

SRGB_CTRL

0x0D00

R/W

[7:6]

0x0

Reserved

R/W

[5:4]

0x0

gamma_b control

0x0: disable

0x1: full screen

0x2: windowed

0x3: Reserved

R/W

[3:2]

0x0

gamma_a control

0x0: disable

0x1: full screen

0x2: windowed

0x3: Reserved

R/W

[1:0]

0x0

sRGB control

0x0: disabled

0x1: full screen

0x2: windowed

0x3: Reserved

SRGB_BLACK_R

0x0D01

R/W

[7:0]

0x0

Black Point Red Delta

Color Space Warp

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