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參數(shù)資料
| 型號： | BUF20800AIDCPR |
| 英文描述： | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
| 中文描述： | 18通道伽瑪雙通道可編程的VCOM電壓發(fā)生器 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 765K |
| 代理商： | BUF20800AIDCPR |
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SBOS329D JUNE 2005 REVISED OCTOBER 2006
www.ti.com
17
DYNAMIC GAMMA CONTROL
Dynamic gamma control is a technique used to improve
the picture quality in LCD TV applications. The brightness
in each picture frame is analyzed and the gamma curves
are adjusted on a frame-by-frame basis. The gamma
curves are typically updated during the short vertical
blanking period in the video signal. Figure 16 shows a
block diagram using the BUF20800 for dynamic gamma
control and V
COM
output.
The BUF20800 is ideally suited for rapidly changing the
gamma curves because of its unique topology:
double register input structure to the DAC;
fast serial interface;
simultaneous updating of all DACs by software. See
the
Read/Write Operations
to write to all registers and
the
Output Latch
sections.
The double register input structure saves programming
time by allowing updated DAC values to be pre-loaded into
the first register bank. Storage of this data can occur while
a picture is still being displayed. Because the data is only
stored into the first register bank, the DAC output values
remain unchanged—the display is unaffected. During the
vertical sync period, the DAC outputs (and therefore, the
gamma voltages) can be quickly updated either by using
an additional control line connected to the LD pin, or
through software—writing a ‘1’ in bit 15 of any DAC
register. For the details on the operation of the double
register input structure, see the
Output Latch
section.
Example:
Update all 18 gamma registers simultaneously
via software.
Step 1:
Check if LD pin is placed in HIGH state.
Step 2:
Write DAC Registers 118 with bit 15 always ‘0’.
Step 3:
Write any DAC register a second time with identi-
cal data. Make sure that bit 15 is ‘1’. All DAC channels will
be updated simultaneously after receiving the last bit of
data. (Note: this step may be eliminated by setting bit 15
of DAC 18 to ‘1’ in the previous step.)
Digital
Picture
Data
Histogram
Gamma
Adjustment
Algorithm
SDA
BUF20800
Gamma References
Timing Controller/
μ
Controller
1 through 18
SCL
Source Driver
Source Driver
V
COM
Black
White
Figure 16. Dynamic Gamma Control
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| BUF20820AIDCPR | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
| BUF20820AIDCPRE4 | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BUF20800AIDCPRE4 | 功能描述:LCD Gamma緩沖器 18-Ch Vltg Generator w/2 Prog VCOM Chs RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF20800ATDCPRQ1 | 功能描述:LCD Gamma緩沖器 AUTO CAT 18CH GAMMA VLTG GEN RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF20800-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:18-CHANNEL GAMMA VOLTAGE GENERATOR WITH TWO PROGRAMMABLE VCOM CHANNELS |
| BUF20820 | 制造商:BB 制造商全稱:BB 功能描述:18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
| BUF20820AIDCPR | 功能描述:LCD Gamma緩沖器 18-Ch Vltg Generator w/2 Prog VCOM Chs RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
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