Transflective LCD Panel with Integrated Color Filter and Reflective Layer
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Solution Overview
Problem
Transflective liquid crystal display panels face issues with color-mixing phenomena due to misalignment between substrates, leading to increased fabrication costs and waste, as well as reduced reflectivity.
Innovation Solution
The solution involves fabricating a color filter layer on one substrate before forming thin film transistors, allowing for direct rework and integration of both layers, with a reflective layer enhancing ambient light reflection without passing through the color filter, thus reducing misalignment and increasing reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the color filter layer is formed on the array substrate after thin film transistor fabrication, then the alignment accuracy between substrates is improved, but the fabrication cost increases and yield decreases due to difficulty in rework
Solution Approach 1:
The color filter layer is formed on the array substrate before thin film transistor fabrication. This preliminary action allows the color filter layer to be in place and protected during subsequent processing steps, enabling easy rework if defects occur while maintaining alignment accuracy through the integrated structure
Solution Approach 2:
The color filter layer and thin film transistor are integrated on the same array substrate, forming a unified structure. This merging eliminates the need for separate substrate alignment and allows both components to be fabricated and reworked together, improving both alignment accuracy and fabrication yield
2Ease of manufacture
If the color filter layer is formed on the array substrate, then the color display function is achieved, but the reflective ability of the display panel decreases due to light passing through the color filter layer
Solution Approach 1:
The pixel structure is segmented into distinct reflecting region and transmitting region. The reflecting region contains a reflective layer that reflects ambient light without passing through the color filter layer, while the transmitting region allows backlight to pass through the color filter layer for color display. This segmentation enables both high reflective ability and color display function to coexist
Solution Approach 2:
Different regions of the array substrate are assigned different functions: some regions have reflective layers for high reflectivity (reflecting region), while other regions have color filter layers for color display (transmitting region). This local quality differentiation allows each region to optimize its specific function without compromising the other
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 prevents color-mixing, increases yield, reduces fabrication costs, and enhances the reflective ability of the display panel by allowing direct rework of the color filter layer and integrating it with thin film transistors on a substrate, while improving light reflection intensity.
Implementation Method 1
a liquid crystal layer disposed between the first substrate and the second substrate
Implementation Method 2
a first reflective layer disposed between the color filter layer and the first substrate and located in the reflecting region
Data Source
AI summary
A transflective liquid crystal display panel includes a first substrate, a second substrate arranged opposite to the first substrate, and a plurality of pixels positioned between the first substrate and the second substrate. Each of the pixels having at least one reflecting region and at least one transmitting region includes a color filter layer formed on the substrate and located in both of the reflecting region and the transmitting region, at least one first reflective layer formed between the color filter layer and the substrate and located in the reflecting region, at least one switch element located in the reflecting region, and at least one second reflective layer located in the reflecting region.