Transflective Display Wall Electrodes Optical Path
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Solution Overview
Problem
Transflective liquid crystal displays face challenges in achieving matched opto-electric characteristics between transmissive and reflective regions due to differing cell thicknesses, leading to disparate response times and increased manufacturing complexity and costs.
Innovation Solution
The implementation of wall-shaped electrodes on the array and color filter substrates to divide sub-pixel regions into transmissive and reflective regions with equal cell thickness, allowing for the same optical path difference by using liquid crystals with different refractive indices, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a double cell-thickness structure is used to equalize optical path differences, then opto-electric characteristics are matched, but response time varies and manufacturing complexity increases
Solution Approach 1:
The sub-pixel regions are segmented into transmissive sub-subpixel regions and reflective sub-subpixel regions by wall-shaped electrodes. This segmentation allows each region to be optimized independently while maintaining a uniform overall cell thickness, resolving the contradiction between opto-electric matching and structural complexity.
Solution Approach 2:
Different liquid crystal materials with different refractive indices are used in transmissive and reflective regions respectively. The transmissive region uses liquid crystal with refractive index nt and the reflective region uses liquid crystal with refractive index nr, where nt ≠ nr. This local quality differentiation enables optical path difference equalization while maintaining uniform cell thickness.
2Reliability
If different liquid crystal modes are used for transmissive and reflective regions, then opto-electric characteristics are improved, but manufacturing difficulty and production costs increase
Solution Approach 1:
The invention changes the refractive index parameter of the liquid crystal material to achieve opto-electric performance optimization. By selecting liquid crystal materials with appropriate refractive indices (nt for transmissive, nr for reflective) rather than changing the liquid crystal mode, the manufacturing process remains simple while achieving excellent opto-electric characteristics.
3Ease of manufacture
If uniform cell thickness is used, then manufacturing is simplified, but optical path differences between transmissive and reflective regions become unequal
Solution Approach 1:
The refractive index parameter of the liquid crystal is adjusted to compensate for the optical path difference. By using liquid crystal with different refractive indices in transmissive and reflective regions, the optical path differences are equalized despite uniform cell thickness, thus maintaining both manufacturing simplicity and optical precision.
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 ensures consistent optical path differences for both regions, reducing response time variations and manufacturing complexities while maintaining high visibility and energy efficiency, and eliminates the need for additional compensation films, thus simplifying the driving circuitry and reducing production costs.
Implementation Method 1
light of the transmissive regions and the reflective regions has a same optical path difference
Implementation Method 2
The transmissive region adopts the backlight source for luminescence and light can only transmit the liquid crystal layer once. While the reflective region illuminates by reflecting surrounding environment light source and light needs to transmit the liquid crystal layer twice
Data Source
AI summary
A display device and a manufacturing method thereof. The display device includes: an array substrate and a color film substrate which are disposed oppositely each other forming a cell, two-dimensionally arranged sub-pixel regions are correspondingly formed in the array substrate and the color film substrate respectively; wall-shaped electrodes, sandwiched between the array substrate and the color film substrate, the wall-shaped electrodes separate each row or line of the sub-pixels region to form a light ray transmission area and a light ray reflection area; and a liquid crystal layer, sandwiched between the array substrate and the color film substrate, and including liquid crystal in transmission area and liquid crystal in reflection area respectively filled in the light ray transmission area and the light ray reflection area, wherein light rays of the light ray transmission area and the light ray reflection area has the same optical path differences.