Mono-Cell Gap Transflective LCD Driving Method
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Solution Overview
Problem
Transflective LCD devices with multi-cell gap configurations face manufacturing defects such as alignment layer deposition issues, polyimide agglomeration, and texture defects, leading to reduced contrast ratio and display quality.
Innovation Solution
A method for driving an LCD device with a mono-cell gap configuration, where data signals are boosted to equal pixel voltages for both transmissive and reflective electrodes, ensuring equal retardation of light passing through the liquid crystal layer, and manufacturing an array substrate with equal cell gaps to prevent these defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-cell gap configuration is used in transflective LCD devices, then the transmissive and reflective areas can be formed, but manufacturing defects such as alignment layer deposition issues, polyimide agglomeration, and texture defects occur
Solution Approach 1:
The patent merges the transmissive and reflective electrode structures into a single cell gap configuration, eliminating the need for separate cell gap formations. This is achieved by forming both transmissive and reflective electrodes on the same substrate plane without creating steps, thereby combining what were previously separate structural requirements into a unified design that prevents alignment layer deposition defects and polyimide agglomeration
Solution Approach 2:
The patent extracts and eliminates the step structures that caused manufacturing defects. By removing the need for different cell gaps in transmissive and reflective areas, the invention takes out the problematic multi-level structure that led to alignment layer deposition issues and texture defects, achieving a planar single-cell-gap design
2Adaptability or versatility
If a multi-cell gap configuration is used, then transmissive and reflective areas can be formed, but contrast ratio is reduced due to manufacturing defects
Solution Approach 1:
The patent merges the transmissive and reflective electrode structures into a single cell gap configuration, eliminating the need for separate cell gap formations. This is achieved by forming both transmissive and reflective electrodes on the same substrate plane without creating steps, thereby combining what were previously separate structural requirements into a unified design that prevents alignment layer deposition defects and polyimide agglomeration
Solution Approach 2:
The patent changes the cell gap parameter from a multi-level configuration to a single uniform gap throughout the display area. By maintaining a constant cell gap distance between the substrate and counter-substrate across both transmissive and reflective regions, the invention eliminates the parameter variations that caused contrast ratio reduction and manufacturing defects
3Manufacturing precision
If steps are formed on TFT substrate or color filter substrate to create different cell gaps, then the cell gap in reflective area can be smaller, but alignment defects such as polyimide agglomeration and texture defects occur
Solution Approach 1:
The patent merges the transmissive and reflective electrode structures into a single cell gap configuration, eliminating the need for separate cell gap formations. This is achieved by forming both transmissive and reflective electrodes on the same substrate plane without creating steps, thereby combining what were previously separate structural requirements into a unified design that prevents alignment layer deposition defects and polyimide agglomeration
Solution Approach 2:
The patent uses asymmetric electrode positioning within a symmetric single-cell-gap structure. The transmissive and reflective electrodes are positioned at different locations on the substrate, but both operate within the same cell gap distance, creating an asymmetric functional layout without symmetric structural complexity
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 approach reduces manufacturing steps, increases contrast ratio, and improves display quality by eliminating texture and alignment defects associated with multi-cell gap configurations, enhancing the yield of LCD devices.
Implementation Method 1
A liquid crystal cell on a transmissive area alters the phase of incident light by a 1⁄2λ retardation
Implementation Method 2
incident light into the reflective electrode passes through the liquid crystal layer two times before and after reflection from the reflective electrode
Data Source
AI summary
In a method for driving a liquid crystal display (LCD) device, an array substrate, a method of manufacturing the array substrate and the LCD device having the same, data signals are boosted by a first and a second boost signals up to a first and a second pixel voltages, respectively. The first and the second pixel voltages are applied to a transmissive electrode and a reflective electrode, respectively. As a result, the retardation of light passing through a liquid crystal layer on the transmissive electrode and the retardation of light of the liquid crystal layer on the reflective electrode may be controlled to be substantially equal to each other. Thus, the LCD device is driven in a transflective mode with a mono-cell gap so that the yield of the LCD device may be increased.