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參數(shù)資料
| 型號(hào)： | BUF12800AIPWPR |
| 英文描述： | REFERENCE VOLTAGE GENERATOR for LCD GAMMA CORRECTION |
| 中文描述： | 參考電壓發(fā)生器，用于LCD伽瑪校正 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 282K |
| 代理商： | BUF12800AIPWPR |
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SBOS315 DECEMBER 2004
www.ti.com
11
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 12 shows a
block diagram using the BUF12800 for dynamic gamma
control.
The BUF12800 is ideally suited for rapidly changing the
gamma curves due to 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
Output Latch
sections.
The double register input structure saves programming
time by allowing updated DAC values to be pre-stored 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 12 registers simultaneously via
software.
Step 1:
Check if LD pin is placed in HIGH state.
Step 2:
Write DAC Registers 112 with bit 15 always 0.
Step 3:
Write any DAC register a second time with
identical data. Make sure that bit 15 is 1. All DAC
channels will be updated simultaneously after receiving
the last bit of data.
Digital
Picture
Data
Histogram
Gamma
Adjustment
Algorithm
SDA
BUF12800
Gamma References
Timing Controller/
μ
Controller
A through L
SCL
Source Driver
Source Driver
Black
White
Figure 12. Dynamic Gamma Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BUF12800AIPWPRG4 | 功能描述:LCD Gamma緩沖器 Ref Vltg Generator for Correction 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 |
| BUF12800EVM | 功能描述:放大器 IC 開發(fā)工具 BUF12800 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| BUF12840 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator |
| BUF12840_12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator with Integrated Two-Bank Memory and External EEPROM |
| BUF12840AIRGER | 功能描述:LCD Gamma緩沖器 12 Channel Gamma Buffer 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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