Transflective LCD Subpixel with Dual-Mode Optical Path Control
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Solution Overview
Problem
Conventional transflective TFT-LCDs suffer from poor display effects due to optical distance differences between transmissive and reflective regions, causing interference between internal and external light, which affects viewing quality, especially in bright environments.
Innovation Solution
A liquid crystal display panel with subpixel units comprising both transmissive and reflective portions, where different voltages are applied to the pixel electrodes to adjust the refractive ratios of the liquid crystal layer, ensuring consistent optical distances for both types of light, and a color filter substrate with multiple color units to enhance display consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transflective TFT-LCD uses both transmissive and reflective regions to improve light intensity, then the display visibility in bright environments is improved, but optical distance differences cause interference between internal and external light
Solution Approach 1:
The patent applies local quality by configuring different optical path lengths in different regions of the liquid crystal layer. Specifically, the reflective region has a different optical path length compared to the transmissive region, allowing each region to be optimized for its specific function while maintaining overall display quality and eliminating interference patterns.
2Adaptability or versatility
If the optical path lengths of transmissive and reflective regions are different, then each region can be optimized for its function, but interference occurs between internal and external light
Solution Approach 1:
The patent employs parameter changes by adjusting the thickness of the liquid crystal layer in different regions (reflective vs. transmissive) to achieve different optical path lengths. This allows optimization of each region's function while the patent specifically addresses interference by configuring these parameters to eliminate harmful interference effects.
3Device complexity
If a single liquid crystal layer is used for both transmissive and reflective regions, then device complexity is reduced, but optical distance differences degrade display effect
Solution Approach 1:
The patent applies segmentation by dividing the liquid crystal display into distinct transmissive and reflective regions with different liquid crystal layer configurations. This segmentation allows each region to be independently optimized for its specific optical function while maintaining overall device integration, resolving the contradiction between structural simplicity and display quality.
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 solution eliminates optical distance differences between transmissive and reflective light paths, improving display quality by ensuring consistent optical distances and reducing interference, thereby enhancing the overall viewing experience, especially in bright conditions.
Implementation Method 1
different voltages are applied to the transmissive pixel electrode and the reflective pixel electrode in a same subpixel unit, thereby eliminating an optical distance difference between reflected light and transmissive light
Implementation Method 2
light from an external light source (e.g., natural light and etc.) enters into the liquid crystal layer 13 after passing through the color filter substrate, is irradiated on the reflective region 111 of the array substrate 11, passes through the liquid crystal layer 13 again after being reflected by a reflector (e.g., a metal film and the like) in the reflective region 111
Data Source
AI summary
Embodiments of the present invention disclose a liquid crystal display panel and a method of driving the same. A subpixel unit includes a transmissive portion and a reflective portion, the transmissive portion comprises a transmissive portion thin film transistor and a transmissive pixel electrode connected to a drain of the transmissive portion thin film transistor, the reflective portion comprises a reflective layer, a reflective portion thin film transistor and a reflective pixel electrode connected to a drain of the reflective portion thin film transistor, a gate of the transmissive portion thin film transistor and a gate of the reflective portion thin film transistor each are connected to a gate line of the subpixel unit, and a source of the transmissive portion thin film transistor and a source of the reflective portion thin film transistor are connected to different data lines.