Source Driver Gamma Voltage Generator for LCD Viewing Angle
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Solution Overview
Problem
Liquid crystal display (LCD) systems face limitations in visibility, viewing angle, color shift, cross talk phenomenon, and side-visibility due to narrow viewing angles and inadequate voltage control across pixel regions.
Innovation Solution
A source driver incorporating a gamma voltage generator and digital to analog converter that generates and selects gamma voltages with varying levels to drive sub-pixel regions independently, improving voltage control and light transmission axis directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are aligned perpendicular to substrate with cutout or protrusion patterns to form multi-domain structure, then viewing angle and contrast are improved, but side-visibility and cross talk phenomenon remain unacceptable
Solution Approach 1:
The pixel electrode is divided into multiple pixel regions (first pixel region and second pixel region) with different voltage applications. This segmentation allows different portions of the same pixel to have different voltage levels, creating distinct electric field directions that improve side-visibility while maintaining overall viewing angle performance.
Solution Approach 2:
Different voltage levels are applied to different pixel regions within the same pixel. The first pixel region receives a first voltage and the second pixel region receives a second voltage, creating local quality differences that address side-visibility issues without compromising overall display performance.
2Device complexity
If traditional gamma voltage generation is used, then circuit complexity is reduced, but visibility and color shift performance deteriorate
Solution Approach 1:
The gamma voltage generator is segmented into multiple independent voltage generation paths, each producing specific gamma voltages for different pixel regions. This allows precise voltage control for visibility improvement while keeping each individual voltage generation path relatively simple.
Solution Approach 2:
The system dynamically selects and applies different gamma voltages to different pixel regions based on timing control signals. This dynamic voltage switching enables improved visibility and color performance without requiring permanently complex circuitry.
Data Source
AI summary
A source driver for driving at least one sub-pixel is disclosed, in which the source driver includes a gamma voltage generator and a digital to analog converter. The gamma voltage generator generates a plurality of gamma voltages, in which the gamma voltage generator includes a first gamma resistor string and an operation circuit. The first gamma resistor string includes a plurality of resistors electrically connected serially for dividing a first gamma reference voltage and a second gamma reference voltage into the gamma voltages. The operation circuit optionally adds increments to the gamma voltages according to a timing control signal, wherein the increments are the same when the gamma voltages are added. The digital to analog converter selecting one of the gamma voltages generated by the operation circuit as a driving voltage based on received digital pixel data.