Overlapping Subpixel Electrodes for LCD Transmittance and Kick-Back Reduction
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Solution Overview
Problem
Liquid crystal displays, particularly in the vertically aligned mode, face issues with reduced transmittance and display quality due to kick-back voltage, especially when driven at low frequencies, and struggle to maintain side visibility comparable to front visibility.
Innovation Solution
The implementation of a liquid crystal display configuration with overlapping first and second subpixel electrodes on a common electrode, creating regions with different electric field intensities to enhance transmittance and reduce kick-back voltage, while maintaining side visibility akin to front visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If one pixel is divided into two subpixels located in separate regions to improve side visibility, then side visibility is improved, but transmittance is reduced due to distance between subpixels
Solution Approach 1:
The patent transitions from a planar arrangement of subpixels to a three-dimensional stacked configuration where the first subpixel electrode is disposed on the second subpixel electrode. This vertical stacking allows subpixels to be closely positioned in the thickness direction while maintaining separate functional regions, thereby improving transmittance by reducing the distance between subpixels while still achieving side visibility enhancement through differential voltage application to each subpixel region.
2Use of energy by moving object
If a high-resolution liquid crystal display is driven at a low frequency, then power consumption is reduced, but flicker and display quality deterioration occur due to kickback voltage
Solution Approach 1:
The pixel electrode is divided into first and second subpixel electrodes that can be independently controlled with different voltages. By segmenting the pixel into two functional regions, the patent enables differential voltage application where one subpixel can be maintained at a higher voltage to reduce kickback effects while the other operates at lower voltage for power savings, thereby maintaining display quality at low driving frequencies.
Solution Approach 2:
Different voltage levels are applied to different subpixel regions based on their specific functional requirements. The first subpixel electrode receives a first voltage and the second subpixel electrode receives a second voltage, allowing local optimization where critical regions maintain higher voltage for stability while other regions use lower voltage for power efficiency, thus preventing flicker and quality deterioration during low-frequency operation.
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 increases transmittance and reduces the impact of kick-back voltage, thereby improving display quality and maintaining side visibility comparable to front visibility without significant deterioration.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes
Implementation Method 2
determines the direction of liquid crystal molecules of the liquid crystal layer by the generated electric field, and controls polarization of incident light
Data Source
AI summary
A liquid crystal display includes: a first subpixel electrode disposed on a first substrate; an insulating layer disposed on the first subpixel electrode; a second subpixel electrode disposed on the insulating layer; and a common electrode disposed on a second substrate, the second substrate facing the first substrate. The first subpixel electrode is overlapped with a portion of the second subpixel electrode, and the first subpixel electrode and the second subpixel electrode are configured to receive substantially the same electric potential.