Semi-Transmissive IPS LCD Panel Single Cell Gap Luminance
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Solution Overview
Problem
Conventional semi-transmissive in-plane switching mode liquid crystal display panels require a dual cell gap structure to achieve the same luminance in transmissive and reflective portions, which complicates the fabrication process and leads to inefficiencies.
Innovation Solution
A semi-transmissive in-plane switching mode liquid crystal display panel with a single cell gap structure, where storage capacitors in the reflective portion generate a horizontal electric field different from that in the transmissive portion, compensating for phase differences and ensuring uniform luminance across both portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual cell gap structure is used to achieve uniform luminance in transmissive and reflective portions, then luminance uniformity is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent applies local quality by creating different cell gap heights in different regions of the display panel. Specifically, the first cell gap (between first substrate and second substrate) and the second cell gap (between second substrate and third substrate) have different heights, allowing the transmissive and reflective portions to achieve uniform luminance through localized structural variation rather than a complex dual cell gap structure throughout the entire device.
Solution Approach 2:
The patent introduces a vertical dimension variation by stacking multiple substrates at different heights to create different cell gap regions. This dimensional approach allows the same luminance uniformity to be achieved through vertical layering (first substrate-second substrate-third substrate arrangement) rather than through complex lateral structural variations, simplifying the overall device architecture.
2Manufacturing precision
If a dual cell gap structure is implemented to compensate for phase differences, then phase difference compensation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by providing different cell gap heights in specific regions (first cell gap vs. second cell gap) to compensate for phase differences in transmissive and reflective portions respectively. This localized approach achieves the required phase difference compensation without requiring the entire device to use a complex dual cell gap structure, thereby reducing overall fabrication complexity while maintaining manufacturing precision where needed.
3Illumination intensity
If additional processing steps are added to create dual cell gap structure, then luminance uniformity is achieved, but productivity decreases
Solution Approach 1:
The patent merges the functions of achieving luminance uniformity and phase difference compensation into a single integrated multi-substrate structure. By combining the first substrate, second substrate, and third substrate into one unified assembly with inherently different cell gap regions, the patent eliminates the need for separate additional processing steps that would be required in a conventional dual cell gap structure, thereby maintaining productivity while achieving luminance uniformity.
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 allows for uniform luminance in both transmissive and reflective portions of each pixel region without the need for additional processing steps, simplifying the fabrication process and enhancing efficiency.
Implementation Method 1
Liquid crystal display (LCD) devices display an image by adjusting the light transmittance of liquid crystals
Implementation Method 2
a liquid crystal layer which is dispensed in the cell gap and oriented in a predetermined direction
Implementation Method 3
storage capacitors each forming, in the reflective portion of an associated one of the pixel regions, a horizontal electric field different from a horizontal electric field formed in the transmissive portion of the associated pixel region, to compensate for a phase difference generated in the associated pixel region
Implementation Method 4
The reflective electrodes function to reflect light externally incident to the LCD device
Data Source
AI summary
A semi-transmissive in-plane switching (IPS) mode liquid crystal display (LCD) panel, in which each pixel region can exhibit the same luminance in transmissive and reflective portions thereof while having a single cell gap structure, is disclosed. A method for fabricating the semi-transmissive IPS mode LCD panel is also disclosed. The panel, in which each pixel region includes a transmissive portion and a reflective portion, comprises a color filter substrate, a thin film transistor substrate assembled with the color filter substrate such that a cell gap is defined between the thin film transistor substrate and the color filter substrate, the thin film transistor substrate including storage capacitors each forming, in the reflective portion of an associated one of the pixel regions, a horizontal electric field different from a horizontal electric field formed in the transmissive portion of the associated pixel region, to compensate for a phase difference generated in the associated pixel region, and a liquid crystal layer dispensed in the cell gap, and oriented in a predetermined direction.