Liquid Crystal Display Odd-Even Row Brightness Control
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Solution Overview
Problem
Liquid crystal displays suffer from color cast issues at large viewing angles due to directional light control, which existing solutions either reduce transmittance significantly or complicate mathematical algorithms and increase chip costs.
Innovation Solution
A display device with pixels distributed differently on odd and even rows, where the brightness of odd rows is alternately set higher or lower than that of even rows, using differential output enable signals for scan lines to mix light effectively and maintain uniform brightness without reducing transmittance or increasing algorithm complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pixels are divided into main pixel and sub pixel to improve color cast, then color cast is reduced, but transmittance of the panel reduces significantly
Solution Approach 1:
The patent segments the pixel array into odd rows and even rows with different brightness characteristics. By dividing the display into alternating bright and dark rows rather than dividing individual pixels, the solution reduces color cast while maintaining full pixel transmittance area.
Solution Approach 2:
Instead of dividing pixels horizontally into sub-pixels (2D segmentation), the patent applies brightness differentiation in the vertical dimension by alternating row brightness. This dimensional shift allows color cast correction without reducing the transmittance area of individual pixels.
2Object-affected harmful factors
If mathematical algorithms are used in timing processing chip to improve color cast, then color cast is reduced, but algorithm complexity increases and chip cost increases
Solution Approach 1:
The patent extracts the color cast correction function from the timing processing chip's algorithm and implements it through physical row brightness differentiation. This removes the need for complex mathematical algorithms in the chip, simplifying the device while maintaining color cast correction.
Solution Approach 2:
The patent replaces the software-based mathematical algorithm system with a hardware-based optical system using differential row brightness. This substitution eliminates complex computational requirements while achieving the same visual correction effect.
3Adaptability or versatility
If directional light valve control is used in VA mode to expand viewing angle, then viewing angle is improved, but color cast occurs at large viewing angles
Solution Approach 1:
The patent introduces asymmetry in the display by creating alternating bright and dark rows. This asymmetric brightness pattern compensates for the symmetric color cast issue that occurs in VA mode at large viewing angles, allowing wide viewing angle maintenance while correcting color distortion.
Data Source
AI summary
The present application discloses a display device and a liquid crystal display, wherein the display device has a plurality of pixels, and the plurality of pixels are distributed at intervals along an array of a plurality of rows and columns; the pixel distributed at intervals along a plurality of rows includes a plurality of pixels distributed at intervals on odd rows and a plurality of pixels distributed at intervals on even rows; the brightness of the pixels on the odd rows is disposed differentially from the brightness of the pixels on the even rows.