Transflective LCD With Uneven Reflective Plate and Flattening Film
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Solution Overview
Problem
Conventional transflective liquid crystal display apparatuses in the in-plane switching mode face difficulties in achieving wide view angles due to challenges in setting the reflective and transmissive part differences and maintaining display quality, particularly with the pretilt angle of liquid crystals and the angle of incident and exit light.
Innovation Solution
The solution involves a transflective liquid crystal display apparatus with a reflective area featuring an uneven reflective plate and a flattening film, where the uneven reflective plate is designed to diffusely reflect light at an incident angle of 30 degrees to exit angles of 0-10 degrees, and the flattening film is set to be flat or nearly flat, allowing for stable electrode formation and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an uneven reflective plate is used to achieve wide view angles by diffusely reflecting light, then the view angle is improved, but the surface becomes uneven making electrode formation difficult
Solution Approach 1:
A flattening film is introduced as an intermediary layer between the uneven reflective plate and the electrodes. This mediator maintains the light-diffusing function of the uneven reflective plate while providing a flat surface for easy electrode formation and alignment.
Solution Approach 2:
The reflective plate is designed with segmented uneven portions having different tilt angles (3-12 degrees). This segmentation allows different regions to reflect light in different directions, achieving wide view angles while the overall structure can still support electrode formation through the flattening film.
2Illumination intensity
If the reflective plate tilt angle is increased to improve light reflection at 30 degrees incident angle, then the reflection efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The tilt angle parameter of the uneven reflective plate is optimized to a specific range (3-12 degrees) that balances reflection efficiency at 30 degrees incident angle with manufacturability. This parameter change allows achieving good reflection performance without requiring excessive manufacturing precision.
Solution Approach 2:
Different regions of the reflective plate have locally optimized tilt angles within the 3-12 degree range. This local quality approach allows each region to be tailored for optimal light reflection while maintaining overall manufacturing feasibility through the flattening film structure.
3Ease of manufacture
If a completely flat surface is used for electrode formation, then the ease of manufacture is improved, but the light diffusion capability for wide view angles is reduced
Solution Approach 1:
The flattening film serves as an intermediary that decouples the two conflicting requirements: the uneven reflective plate provides light diffusion capability while the flat surface of the flattening film enables easy electrode formation. Both functions are preserved simultaneously.
Solution Approach 2:
The solution moves from a two-dimensional choice (either uneven or flat) to a three-dimensional structure where the reflective plate has unevenness for light diffusion while the upper surface (after flattening film) remains flat for electrode formation. This dimensional approach resolves the contradiction.
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 configuration enables the achievement of wide view angles and stable operation by setting the average tilt angle of the uneven reflective plate between 3-12 degrees and the flattening film surface to 3-5 degrees, enhancing the reflection properties and durability of the apparatus.
Implementation Method 1
the uneven reflective plate comprises a diffusive reflecting function that is capable of diffusely reflecting light making incident at an incident angle of 30 degrees towards directions at exit angles of 0-10 degrees
Implementation Method 2
Regarding the liquid crystal display apparatus 100, in the pixel to which the data signals (selected by the scanning signals supplied through the scanning lines, and supplied through the data lines 24) are written, parallel electric fields are generated in the above-described transparent insulating substrates 22a, 22b between the common electrodes 26 and the pixel electrodes 27. The alignment direction of the liquid crystal molecules is rotated within a plane in parallel to the transparent insulating substrates 22a, 22b in accordance with the generated electric field
Data Source
AI summary
To provide a transflective liquid crystal display apparatus that employs in-plane switching mode (in-plane switching system), which exhibits a reflection property of wide view angles. Provided is a transflective liquid crystal display apparatus which comprises: a reflective area and a transmissive area; an uneven reflective plate provided in the reflective area; a flattening film laminated on the uneven reflective plate; and common electrodes and pixel electrodes arranged on the flattening film, wherein, the uneven reflective plate comprises a diffusive reflecting function that is capable of diffusely reflecting light making incident at an incident angle of 30 degrees towards directions at exit angles of 0-10 degrees, and a surface of the flattening film is set to be substantially flat.