Gamma Correction On The Circuit Panel Driver

What does the term "gamma" in the technique of LCD panel television or monitor?
Why gamma is important in the technique of LCD?

In a simple easy to understand so that we can describe as follows:

The term gamma or more details is "gamma correction" is a parameter which is almost similar to the contrast and britnes. If the contrast and image signal level affect britnes starting from the lowest level (dark) to the highest level (white), then gamma only affect the level or mid-level grey between dark and white only.

Signal voltage "image" If the signal is converted to "light" by LCD screens will be received by the eyes are not linear, so consequently the image will appear to be not natural anymore, because the middle-level image into tend to be darker.

Gamma correction is required to fix this flaw, so that image back appears natural.

Gamma = 1 is a graph if the LCD screen is not experiencing disabilities gamma
If the LCD display has gamma 1.8 – then the middle part of the level will look darker.
The greater the value of gamma, then the secondary image will be visible level the more dark.

Images if not using gamma correction

If the image has undergone gamma correction

Gamma correction circuit in LCD driver:

• The gamma circuit site is on the "Source" drivers "or" data driver "

• Is a series of "voltage-reference voltage" of which there are not always the same from one LCD screen LCD screen with others.

• Here the image data "digital" was changed to "analog" voltage corresponds to the voltage reference gamma correction.

• Gamma correction are available typically have a value (1.8), (2.0), (2.2) and (2.4)

Examples of external Gamma IC:

• As-15 F/G has 14 channels of voltage reference voltage + «Vcom drive

• BUF 12800 has 12 chanel voltage reference

• BUF20800 have 20 reference voltage + chanel «Vcom voltage drive

• MAX9679 has 12 chanel voltage reference, voltage + «Vcom drive

On a specific type of T-con may not dijumapai ic gamma as the example above. Here gamma correction internal become one with large ic timing control.
Damage to ic gamma can cause:

-Thin images lack contrast.
-Images such as negatif.
-Plain white screen.

Gamma Correction On The Circuit Panel Driver 2016-04-28T22:33:00-07:00 Rating: 4.5 Diposkan Oleh: Unknown