Transflective LCD Reflective Electrode Design for Contrast
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Solution Overview
Problem
IPS-type transflective liquid crystal display devices exhibit low display efficiency and contrast in the reflective part compared to VA-type devices.
Innovation Solution
The design includes a reflective electrode with an uneven and flat portion, where the flat portion is arranged between the transmissive and reflective parts, and the pixel electrode is formed with comb-teeth electrodes, a strip-like connection, and through holes, with a larger number of comb-teeth electrodes and closer spacing in the reflective part to enhance liquid crystal operation and optical path length control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional IPS-type transflective liquid crystal display device is used, then the device structure is simple and easy to manufacture, but the display efficiency and contrast in the reflective part are low compared to VA-type devices
Solution Approach 1:
The reflective electrode is designed with different surface characteristics in different regions: a flat portion in the transmissive part and an uneven portion with protrusions and recesses in the reflective part. This local differentiation optimizes light reflection in the reflective region while maintaining transmissivity in the transmissive region, thereby improving display efficiency without complicating the overall manufacturing process
Solution Approach 2:
The uneven portion of the reflective electrode features protrusions and recesses that create curved surfaces. These curved surfaces enhance light reflection efficiency by directing reflected light more effectively toward the viewer, improving contrast and display efficiency while maintaining the relatively simple IPS-type device structure
2Use of energy by moving object
If voltage is limited to approximately 5V, then energy consumption is controlled, but reflection efficiency is set to approximately 2/3 of transmission efficiency
Solution Approach 1:
By changing the physical structure of the reflective electrode from flat to uneven with specific protrusion heights and spacing, the optical properties are improved. This structural parameter change enables the reflective portion to achieve better reflection efficiency at the same voltage level, reducing the gap between reflection and transmission efficiency while maintaining controlled energy consumption
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 the reflection efficiency and contrast of the reflective part, improving display efficiency compared to conventional IPS-type transflective liquid crystal display devices.
Implementation Method 1
an electric field is applied between both electrodes thus rotating the liquid crystal within a plain of a substrate thus controlling a contrast
Implementation Method 2
the reflective electrode includes an uneven portion and a flat portion, and the flat portion of the reflective electrode is arranged on a boundary portion between the transmissive part and the reflective part
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer formed between the first substrate and the second substrate, and a transistor formed in a pixel. A first insulating layer is formed over the transistor, a first electrode is formed on the first insulating layer, a second insulating layer is formed on the first electrode, a second electrode is formed on the second insulating layer, and the first electrode has a bumpy plane shape and the second electrode has a line shape portion.