Liquid Crystal Display Subpixel Electrode Shapes for Color Motion Blur
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Solution Overview
Problem
Liquid crystal display pixels exhibit varying switching speeds due to different voltage applications, leading to unpleasant color motion blur effects when moving objects across colored backgrounds, as subpixels of different colors switch at different speeds.
Innovation Solution
The display incorporates an array of pixels with subpixels of different colors, featuring distinct electrode shapes and liquid crystal layer thicknesses to synchronize switching speeds, reducing color motion blur by configuring red subpixels to switch slower than green and blue subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If subpixels of different colors are driven with different voltage levels to achieve different brightness levels, then the display can show color images, but the switching speeds of different colored subpixels become unequal causing color motion blur
Solution Approach 1:
The patent applies local quality by giving different liquid crystal layer thicknesses to different colored subpixels. Specifically, the red subpixel has a greater liquid crystal layer thickness than the green and blue subpixels, which compensates for the faster switching speed of red subpixels and equalizes the overall switching speeds across all colors, thereby reducing color motion blur while maintaining color image display capability
2Reliability
If the liquid crystal layer thickness is increased to slow down switching speed, then color motion blur is reduced, but the response time increases
Solution Approach 1:
Instead of uniformly increasing the liquid crystal layer thickness across all subpixels, the patent applies local quality by selectively increasing the thickness only in the red subpixel where the switching speed is excessively fast. This targeted approach equalizes the switching speeds of different colored subpixels without unnecessarily increasing the response time of green and blue subpixels, thus reducing color motion blur while minimizing the overall response time penalty
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
This configuration effectively minimizes color motion blur by equalizing the switching speeds of red, green, and blue subpixels, enhancing the visual clarity when moving objects across colored backgrounds.
Implementation Method 1
The strength of the electric field in a pixel controls the polarization state of the liquid crystal material and thereby adjusts the brightness of the pixel
Implementation Method 2
An array of color filter elements may be used to provide the display with the ability to display color images. The color filter elements may include red, green, and blue elements or color filter elements of different colors
Data Source
AI summary
A layer of liquid crystal material may be interposed between display layers. The display layers may include thin-film transistor circuitry having subpixel electrodes for applying electric fields to subpixel portions of the layer of liquid crystal material. Subpixels of different colors may have different shapes and may have different liquid crystal layer thicknesses. These subpixel differences may be configured to slow the switching speed of subpixels of a certain color relative to other subpixels to reduce color motion blur when an object is moved across a black or colored background. The subpixels may have chevron shapes. Subpixels of a first color may have chevron shapes that are less bent than subpixels of second and third colors. In configurations with varying liquid crystal layer thicknesses, the subpixels of the first color may have thicker liquid crystal layers than the subpixels of the second and third colors.