Reflective Display Device White Pixel Light Loss Reduction
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Solution Overview
Problem
Reflective display devices face issues with reduced luminance and color reproducibility due to light loss and color interference caused by the presence of a color photoresist in the white pixel area.
Innovation Solution
The omission of the white color photoresist and the use of a reflective layer or opaque pixel electrode in the white pixel area, with the reflective layer disposed between the color filter and the insulating layer, reduces light loss and enhances reflectivity, while the opaque pixel electrode, made of the same material as the reflective layer, further minimizes interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a color photoresist is used in the white pixel area, then color interference is reduced, but luminance and color reproducibility deteriorate due to light loss and yellowing
Solution Approach 1:
The patent removes the color photoresist layer from the white pixel area entirely. By extracting this harmful element that causes light absorption and yellowing, the device achieves higher luminance and better color reproducibility while maintaining color interference prevention through the reflective layer configuration
Solution Approach 2:
The patent converts the potential harm of light loss into benefit by introducing a reflective layer that reflects ambient light back through the liquid crystal layer and color filter. This transforms the previously lost light into useful reflected light that enhances luminance and color reproduction in the white pixel area
2Illumination intensity
If a reflective layer is added to improve luminance, then light loss is reduced, but device complexity increases
Solution Approach 1:
The patent merges the reflective layer with the existing insulating layer structure, where the reflective layer is positioned between the color filter and the insulating layer. This integration approach improves luminance while minimizing additional structural complexity by combining functions into existing layers
Solution Approach 2:
The reflective layer serves multiple functions simultaneously: it prevents light loss by reflecting ambient light, maintains color accuracy by working in conjunction with the color filter, and provides a structural base for the pixel electrode. This multi-functionality reduces the need for separate components, thereby limiting complexity increase
3Illumination intensity
If the reflective layer is positioned close to the color filter to enhance reflectivity, then luminance improves, but manufacturing precision requirements increase
Solution Approach 1:
The reflective layer is merged with or positioned immediately adjacent to the insulating layer, creating a integrated structure that reduces the need for precise positioning relative to the color filter. This integration approach maintains high reflectivity while reducing manufacturing precision requirements through structural consolidation
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 enhances luminance and color reproducibility by preventing light loss and color crosstalk, reducing manufacturing costs, and minimizing yellowing and image flicker phenomena.
Implementation Method 1
a reflective layer on the insulating layer and in the red pixel area, the green pixel area, and the blue pixel area
Data Source
AI summary
A display device includes substrate including a red pixel area, a green pixel area, a blue pixel area, and a white pixel area, a gate line and a data line on the substrate, a thin film transistor connected to each of the gate line and the data line, an insulating layer on the gate line, the data line, and the thin film transistor, the insulating layer having grooves in the red pixel area, the green pixel area, and the blue pixel area, respectively, a reflective layer on the insulating layer, the reflective layer being in the red pixel area, the green pixel area, and the blue pixel area, a color filter in each of the grooves of the insulating layer, and a transparent pixel electrode on the color filter and the insulating layer, the transparent pixel electrode being connected to the thin film transistor.