Reflective Display Panel Using Optical Structure for Color
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Solution Overview
Problem
Existing reflective display technologies have low reflectance due to the use of color resist materials with low transmittance, which absorb a significant amount of light, making it difficult to achieve a 30% color gamut requirement and resulting in poor viewing experiences, especially in normal ambient conditions.
Innovation Solution
A reflective display panel is designed with a first and second liquid crystal cell, each comprising substrates with a liquid crystal layer, and an optical structure that includes a ¼ wave plate, a ½ wave plate, and a polarizer to change the polarization states of ambient light, allowing bicolor lights (R, G, B) to be emitted from sub-pixel units, eliminating the need for a color resistance layer and improving aperture opening ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color resist material is used to implement color display, then color gamut can be achieved, but transmittance is low and reflectance is very low due to light absorption
Solution Approach 1:
The patent removes the color resist layer from the display structure. Instead of using color resist materials that absorb light, the invention uses a reflective layer combined with liquid crystal cells and optical compensation films to achieve color display through reflection and polarization control, thereby eliminating the harmful light absorption effect.
Solution Approach 2:
The patent replaces the optical absorption mechanism of color resist materials with an optical reflection and polarization control mechanism. By using a reflective layer, liquid crystal cells, and optical compensation films, the system achieves color display through constructive interference and polarization state control rather than selective absorption.
2Illumination intensity
If color resist layer is used for color display, then color gamut can be achieved, but aperture opening ratio is reduced
Solution Approach 1:
The patent extracts and removes the color resist layer from the display structure. Color display is achieved through the combination of a reflective layer, liquid crystal cells with specific alignment layers, and optical compensation films, eliminating the need for the color resist layer and thereby increasing the aperture opening ratio.
Solution Approach 2:
The patent applies different optical properties to different layers: the reflective layer provides color through selective reflection, the liquid crystal cells control polarization states, and the optical compensation films enhance the color effect. This distributed functional approach replaces the single color resist layer and improves light transmission.
3Illumination intensity
If traditional reflective display structure with color resist layer is used, then color display is achieved, but reflectance is very low making viewing experience poor in normal ambient
Solution Approach 1:
The patent replaces the color resist-based color generation mechanism with a reflective and polarization-based mechanism. The reflective layer combined with liquid crystal cells and optical compensation films creates enhanced color saturation and reflectance, providing superior viewing experience in normal ambient conditions without relying on light absorption.
Solution Approach 2:
The patent uses a composite structure consisting of a reflective layer, liquid crystal cells with specific alignment layers, and optical compensation films. This composite system works synergistically to achieve high reflectance and excellent color display, replacing the insufficient color resist layer.
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 enhances color display by allowing full-color representation with only two sub-pixel units, increasing reflectance by more than one times compared to traditional reflective displays with color resistance layers, while maintaining improved transmittance and color temperature.
Implementation Method 1
the optical structure is configured to change polarization states of lights with different wavelengths in external ambient light passing through the optical structure
Implementation Method 2
an optical structure, arranged at a light-emitting side of the first liquid crystal cell and covering the pixel units
Implementation Method 3
a first liquid crystal cell including a first substrate and a second substrate oppositely arranged to each other, and a first liquid crystal layer between the first substrate and the second substrate
Implementation Method 4
the optical structure includes a 1⁄4 wave plate, a 1⁄2 wave plate and a first polarizer sequentially arranged on the second substrate
Data Source
AI summary
A reflective display panel and a display device are provided. The reflective display includes: a first liquid crystal cell including a first substrate and a second substrate oppositely arranged to each other, and a first liquid crystal layer between the first substrate and the second substrate; a plurality of pixel units on the first substrate, where each pixel unit includes a first sub-pixel unit and a second sub-pixel unit; an optical structure, arranged at a light-emitting side of the first liquid crystal cell and covering the pixel units.