Liquid Crystal Display Reflection Electrode Insulation Layer
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Solution Overview
Problem
Reflective transmission type liquid crystal displays face challenges in achieving good display quality in both bright and dark surroundings due to limitations in area utilization and color density, leading to reduced brightness and contrast.
Innovation Solution
The design includes a liquid crystal display with a pixel electrode connected to a thin film transistor, featuring a transmission electrode and a reflection electrode with convexities on an insulation layer, allowing for increased reflection area while maintaining transmission area and adjusting color filter layer thickness to balance color density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the reflection electrode is formed over the gate bus line without insulation layer, then the reflection area is increased, but the capacitance between reflection electrode and gate bus line increases causing voltage drop
Solution Approach 1:
An insulation layer is introduced as an intermediary between the reflection electrode and the gate bus line. This insulation layer electrically isolates the two conductors, preventing unwanted capacitance coupling while allowing the reflection electrode to maintain its position over the gate bus line for maximum reflection area utilization.
2Quantity of substance
If the color filter layer thickness is increased to improve color density, then the color density is improved, but the brightness is reduced
Solution Approach 1:
The thickness of the color filter layer is optimized to a specific range (50-200 nm) rather than simply increased. This parameter optimization achieves sufficient color density while minimizing light absorption, thereby maintaining brightness. The precise control of film thickness allows balancing color saturation and light transmission.
3Illumination intensity
If the reflection electrode area is increased to improve reflective display quality, then the reflective display quality is improved, but the transmission area is reduced
Solution Approach 1:
The reflection electrode is positioned in the vertical dimension (over the gate bus line area) rather than expanding horizontally into the transmission pixel area. This spatial arrangement in another dimension allows the reflection electrode to utilize the gate bus line region for reflection without encroaching on the transmission area, enabling both reflective and transmission modes to coexist with adequate display areas.
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 enhances brightness and contrast in both reflective and transmission modes, providing improved display quality with balanced color density and efficient area utilization.
Implementation Method 1
a reflection electrode electrically connected to the transmission electrode
Implementation Method 2
a liquid crystal layer sealed between the first substrate and the second substrate
Data Source
AI summary
A liquid crystal display including a first substrate including a gate bus line, a data bus line intersecting the gate bus line, a thin film transistor formed near an intersection between the gate bus line and the data bus line, and a pixel electrode including a transmission electrode electrically connected to the thin film transistor and a reflection electrode electrically connected to the transmission electrode, a second substrate opposed to the first substrate and including an opposed electrode opposed to the pixel electrode, and a liquid crystal layer sealed between the first substrate and the second substrate. The transmission electrode includes a plurality of electrode units interconnected to each other by an interconnection pattern, and the reflection electrode is formed over the electrode unit with an insulation layer with convexities formed in the surface of the insulation layer.