Non-Planar Pixel Electrode Reflective Portion for Display Light Efficiency
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Solution Overview
Problem
Transparent display devices face a trade-off between increasing the area of light-transmissive and light-emissive areas, which limits both transmittance and aperture ratio, making it difficult to improve both light efficiency and visibility simultaneously.
Innovation Solution
Adjusting the width of the black matrix layer in the left-right direction between the light-transmissive and light-emissive areas, using a non-planar reflective portion in the pixel electrode, and employing an inorganic bank layer to minimize dead zones and enhance light efficiency, while a transparent clad layer serves as an etch stopper to improve surface flatness and reduce reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of the light-transmissive area is increased, then light transmittance is improved, but the aperture ratio decreases
Solution Approach 1:
The patent changes the geometric parameters of the black matrix layer, specifically reducing its width in the left-right direction and optimizing its position. This parameter adjustment allows the light-transmissive area to expand while maintaining proper optical separation, thereby improving light transmittance without significantly reducing the aperture ratio.
Solution Approach 2:
The patent utilizes the vertical dimension by extending the black matrix layer in the up-down direction to compensate for the reduced horizontal width. This dimensional transition allows the black matrix to maintain its light-blocking function while permitting horizontal expansion of the light-transmissive area.
2Area of stationary object
If the area of the light-emissive area is increased, then aperture ratio is improved, but light transmittance decreases
Solution Approach 1:
The patent optimizes the parameters of the black matrix layer, specifically reducing its width in the left-right direction and adjusting its vertical position. This allows the light-emissive area to expand horizontally while the black matrix maintains adequate separation through vertical extension, preserving light transmittance.
3Illumination intensity
If the width of the black matrix layer is reduced, then transmittance and aperture ratio are improved, but color mixing increases
Solution Approach 1:
The patent compensates for the reduced horizontal width of the black matrix layer by extending it in the vertical direction. This dimensional shift maintains the light-blocking capability and prevents color mixing between adjacent light-emissive areas while allowing horizontal expansion of the light-transmissive and light-emissive areas.
Solution Approach 2:
The patent segments the black matrix layer into distinct functional zones: a horizontal extension portion that blocks light from adjacent pixels and a vertical extension portion that prevents color mixing. This segmentation allows the black matrix to perform multiple functions simultaneously with optimized dimensions.
4Ease of manufacture
If a planar pixel electrode is used, then manufacturing is simplified, but light efficiency decreases due to total internal reflection
Solution Approach 1:
The patent introduces a curved or inclined surface portion on the pixel electrode, deviating from a completely planar structure. This curvature modifies the light reflection characteristics, reducing total internal reflection and improving light extraction efficiency while maintaining manufacturing feasibility through standard deposition and etching processes.
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 enhances light efficiency, reduces color mixing, and improves both transmittance and aperture ratio, leading to a more effective and power-efficient display device with improved visibility and reduced power consumption.
Implementation Method 1
a non-planar reflective portion extending along a side surface of an opening disposed in a light-emissive area
Implementation Method 2
a black matrix layer disposed to partially overlap an edge of the color filter layer
Implementation Method 3
a color filter layer disposed on the pixel electrode and spaced apart from the pixel electrode
Data Source
AI summary
A display device has a pixel electrode having a mirror portion extending along a side surface of an opening to act as a side surface reflection mirror of light. Thus, light loss is reduced and an amount at which light is emitted from a sub-pixel is improved. Further, color mixing between light beams from adjacent sub-pixels is reduced, thereby improving light efficiency.