Reflective Electrode Storage Capacitor for Liquid Crystal Display Contrast
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Solution Overview
Problem
Micro-reflective liquid crystal display devices using the TN mode manufacturing method fail to optimize the reflected voltage and reflectance relationship curve, leading to suboptimal contrast, which affects the practicality of the liquid crystal display device.
Innovation Solution
A liquid crystal display panel design where the electrode of a storage capacitor serves as a reflective electrode, with an opening in the black matrix to allow light modulation, and a dielectric layer on top of the storage capacitor to divide the voltage, ensuring the threshold voltage in the reflection area matches that of the transmissive area, thereby enhancing reflection contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the TN mode manufacturing method is used for micro-reflective liquid crystal display devices, then the device can be produced without extra manufacturing processes, but the reflected voltage and reflectance relationship curve cannot be optimized and the contrast is poor
Solution Approach 1:
The patent applies local quality by creating different electrode configurations in different regions of the display panel. Specifically, the storage capacitor electrode in the reflection area is designed with different properties than electrodes in transmissive areas, allowing localized optimization of the voltage-reflectance curve without changing the overall TN mode manufacturing process. This enables region-specific performance tuning while maintaining general manufacturing simplicity.
Solution Approach 2:
The patent implements parameter changes by adjusting the electrode structure and electrical parameters in the reflection area. By modifying the storage capacitor electrode configuration and its electrical characteristics, the patent optimizes the voltage-reflectance relationship curve specifically for reflective modes, thereby improving contrast without requiring a complete manufacturing process overhaul.
2Ease of operation
If the storage capacitor electrode is used as a reflective electrode with an opening in the black matrix, then light modulation is achieved, but the voltage division in the reflection area differs from the transmissive area
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary element between the storage capacitor electrode and the liquid crystal layer. This dielectric layer acts as a voltage division mechanism that compensates for the voltage distribution differences caused by the opening in the black matrix, ensuring that both reflection and transmissive areas achieve proper voltage division and maintain consistent performance characteristics.
3Illumination intensity
If the threshold voltage in the reflection area is matched to the transmissive area, then higher reflection contrast is achieved, but the voltage and reflectance relationship curve requires optimization
Solution Approach 1:
The patent applies local quality by designing the storage capacitor electrode in the reflection area with specific local characteristics that differ from other regions. This localized electrode design enables threshold voltage matching between reflection and transmissive areas, thereby achieving higher reflection contrast while maintaining overall device functionality.
Solution Approach 2:
The patent implements parameter changes by adjusting the electrical parameters of the storage capacitor electrode to optimize the voltage-reflectance relationship curve. By carefully controlling electrode parameters such as area, position, and electrical properties, the patent achieves both threshold voltage matching and optimal voltage-reflectance characteristics for high-contrast reflective display performance.
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
The design achieves higher reflection contrast by matching the voltage and reflectance relationship curve in the reflection area with the transmittance curve in the transmissive area, improving the overall performance of the liquid crystal display device.
Implementation Method 1
the reflective electrode reflects the outside light to provide a light source to the liquid crystal display panel
Implementation Method 2
a dielectric layer on top of the storage capacitor to divide the voltage, ensuring the threshold voltage in the reflection area matches that of the transmissive area
Data Source
AI summary
A liquid crystal display panel and a liquid crystal display device incorporating the same are provided. The liquid crystal display panel includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first base, a dielectric layer and a storage capacitor. The storage capacitor includes a reflective electrode. The dielectric layer covers at least part of the storage capacitor. The second substrate is substantially paralleled to the first substrate. The second substrate includes a second base, a black matrix and a common electrode. The black matrix corresponds to the storage capacitor. The black matrix includes an opening corresponding to the reflective electrode. The opening is provided to let an outside light enter into the liquid crystal display panel such that the reflective electrode reflects the outside light to provide a light source to the liquid crystal display panel.