LCD Reference Voltage Adjustment for Side Visibility
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with side visibility being different from front visibility, leading to poor gray expression and reduced transmittance when pixels are divided into subpixels with different transmittance, affecting picture quality.
Innovation Solution
A liquid crystal display system that includes a signal controller to adjust a reference voltage based on gray-level values, using specific transmittance measurements to ensure side visibility matches front visibility by adjusting the reference voltage relative to the data voltage, with subpixels having different liquid crystal capacitors and switching elements to control voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pixel is divided into two subpixels having different transmittance to improve side visibility, then side visibility is improved, but luminance increases at low and high grayscale levels causing picture quality deterioration
Solution Approach 1:
The patent changes the voltage parameter applied to subpixels based on grayscale level. At low grayscale levels (≤127), a first voltage is applied to maintain accurate gray expression, while at high grayscale levels (>127), a second voltage is applied to improve side visibility. This dynamic parameter adjustment resolves the contradiction by adapting the voltage condition to the specific grayscale requirement.
2Adaptability or versatility
If a pixel is divided into two subpixels having different transmittance to improve side visibility, then side visibility is improved, but transmittance decreases due to gap between subpixels
Solution Approach 1:
The patent adjusts the voltage parameter applied to subpixels based on grayscale level to compensate for transmittance loss. By applying appropriate voltages at different grayscale levels, the liquid crystal alignment is optimized to maintain higher transmittance while still achieving improved side visibility through the subpixel structure.
3Adaptability or versatility
If different voltages are applied to two subpixels to render side visibility similar to front visibility, then side visibility is improved, but luminance increases affecting gray expression at lateral sides
Solution Approach 1:
The patent dynamically changes the voltage parameter applied to subpixels based on the grayscale level of the displayed image. At low grayscale levels, a first voltage is applied to maintain accurate luminance control and gray expression. At high grayscale levels, a second voltage is applied to improve side visibility. This conditional parameter adjustment resolves the contradiction between luminance control and side visibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves accurate gray-level expression and improved transmittance by ensuring side visibility is similar to front visibility, enhancing overall picture quality by optimizing voltage distribution across subpixels.
Implementation Method 1
When a voltage is applied to the field generating electrodes, an electric field is generated on the liquid crystal layer. The electric field determines the alignment directions of liquid crystal molecules of the liquid crystal layer and controls polarization of incident light passing through the liquid crystal layer
Implementation Method 2
The electric field determines the alignment directions of liquid crystal molecules of the liquid crystal layer and controls polarization of incident light passing through the liquid crystal layer
Implementation Method 3
When a voltage is applied to the field generating electrodes, an electric field is generated on the liquid crystal layer. The electric field determines the alignment directions of liquid crystal molecules
Data Source
AI summary
A liquid crystal display (LCD) includes: a display panel including a plurality of pixels connected to a gate line, a data line, and a reference voltage line to which a common voltage is applied; a data driver connected to the data line and configured to apply a data voltage to the data line; a gate driver connected to the gate line and configured to apply a gate voltage to the gate line; a reference voltage generator connected to the reference voltage line and configured to apply a reference voltage to the reference voltage line; and a signal controller configured to control the data driver, the gate driver, and the reference voltage generator, and output a signal to the reference voltage generator for changing the reference voltage applied to the pixels, wherein the reference voltage is changed according to a gray-level value of an image data.