參數(shù)資料
型號(hào)： BUF16820AIDAPRG4
英文描述： 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory
中文描述： 14通道伽瑪電壓發(fā)生器具有可編程威科姆輸出和OTP存儲(chǔ)器
文件頁數(shù)： 19/30頁
文件大?。?/td> 681K
代理商： BUF16820AIDAPRG4
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SBOS356A FEBRUARY 2006 REVISED OCTOBER 2006
www.ti.com
19
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 BUF16820 for dynamic gamma
control and V
COM
output.
The BUF16820 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
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. Since the data are 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 14 gamma registers simultaneously
via software.
Step 1:
Check if LD pin is placed in HIGH state.
Step 2:
Write DAC Registers 114 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 14 to ‘1’ in the previous step.)
Digital
Picture
Data
Histogram
Gamma
Adjustment
Algorithm
SDA
BUF16820
Gamma References
Timing Controller/
μ
Controller
1 through 14
SCL
Source Driver
Source Driver
V
COM
Black
White
Figure 18. Dynamic Gamma Control
相關(guān)PDF資料
PDF描述
BUF20800 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF20800AIDCPR 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF20820 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF20820AIDCPR 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF20820AIDCPRE4 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BUF16821 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
BUF16821_1 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
BUF16821A 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
BUF16821AIPWPR 功能描述:LCD Gamma緩沖器 Progammable Gamma Vltg Gen & Vcom Cal 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
BUF16821AIPWPRQ1 功能描述:IC PROG GAMMA-V GEN 28HTSSOP 制造商:texas instruments 系列:汽車級(jí)，AEC-Q100 包裝:剪切帶（CT） 零件狀態(tài):有效 應(yīng)用:TFT-LCD 面板：伽瑪緩沖器，VCOM 驅(qū)動(dòng)器 輸出類型:滿擺幅 電路數(shù):18 -3db 帶寬:- 壓擺率:- 電流 - 電源:12mA 電流 - 輸出/通道:30mA 電壓 - 電源，單/雙（±）:9 V ~ 20 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應(yīng)商器件封裝:28-HTSSOP 標(biāo)準(zhǔn)包裝:1
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