參數(shù)資料
型號(hào)： BUF20820
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(yè)數(shù)： 20/32頁(yè)
文件大?。?/td> 1826K
代理商： BUF20820
"#$%&$%
SBOS330C DECEMBER 2005 REVISED OCTOBER 2006
www.ti.com
20
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 18 shows a
block diagram using the BUF20820 for dynamic gamma
control and V
COM
output.
The BUF20820 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
BUF20820
Gamma References
Timing Controller/
μ
Controller
1 through 18
SCL
Source Driver
Source Driver
V
COM
Black
White
Figure 18. Dynamic Gamma Control
相關(guān)PDF資料
PDF描述
BUF20820AIDCPR 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF20820AIDCPRE4 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF298AF TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
BUF298AV TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
BUF298F TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(bǔ)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
BUF20820AIDCPRE4 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(bǔ)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
BUF20820EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 BUF20800-BUF20820 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
BUF22821 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
BUF22821AIDCPR 功能描述:LCD Gamma緩沖器 Prgrmbl Gam-Vltg Gen & Vcom Calibrator RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)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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