Sub-Pixel Electrode Layout for Higher-Transmissivity Displays
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Solution Overview
Problem
Current display devices face challenges in achieving enhanced light transmissivity, particularly in designs that incorporate subminiature light emitting elements, where the arrangement of electrodes and light emitting elements affects the overall luminance and durability.
Innovation Solution
A display device structure is developed with a substrate having a display area and non-display area, featuring pixels with sub-pixels that include a pixel circuit layer and a display element layer. The display element layer comprises first and second electrodes spaced apart, with a light emitting element between them, and capping layers made of transparent conductive material to enhance light transmissivity. The structure includes a transmission area with higher light transmissivity than the area with the pixel circuit layer, optimizing the aperture ratio and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If electrodes and light emitting elements are arranged in conventional display devices, then electrical connection is achieved, but light transmissivity is reduced
Solution Approach 1:
The patent transitions from planar electrode arrangement to three-dimensional stacked electrode structures, allowing electrical connection while minimizing obstruction of light transmission path. The stacked configuration enables current flow through vertical layers without requiring large horizontal electrode areas that would block light.
Solution Approach 2:
Different regions of the display device are designed with different optical properties. The pixel region contains light emitting elements with specific electrode arrangements optimized for light emission, while the non-pixel region has transparent conductive structures optimized for light transmission, creating local optimization of both electrical connection and optical performance.
2Illumination intensity
If transparent conductive materials are used for capping layers, then light transmissivity is enhanced, but electrical conductivity may be compromised
Solution Approach 1:
The capping layers are constructed using composite material structures combining transparent conductive oxides (such as ITO, IZO, or AZO) with specific thickness ratios and stacking configurations. This composite approach achieves both high optical transparency and sufficient electrical conductivity by optimizing the material composition and layer structure rather than relying on a single material.
Solution Approach 2:
The patent optimizes parameters of the transparent conductive materials including thickness, resistivity, and compositional ratios (such as In:Zn:O in IZO or In:Sn:O in ITSO). By precisely controlling these parameters within specific ranges, the capping layers achieve the dual requirement of high light transmissivity and adequate electrical conductivity for reliable device operation.
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 proposed structure enhances light transmissivity and aperture ratio, leading to improved image quality and durability of the display device by effectively arranging electrodes and light emitting elements, addressing the limitations of existing technologies.
Implementation Method 1
at least one light emitting element that emits light
Implementation Method 2
the at least one light emitting element disposed between the first electrode and the second electrode
Implementation Method 3
The first capping layer and the second capping layer may be made of transparent conductive material
Data Source
AI summary
A display device comprises a substrate including a display area and a non-display area, and pixels disposed in the display area, each of the pixels including sub-pixels. Each of sub-pixels includes a pixel circuit layer, and a display element layer including at least one light emitting element. The display element layer includes first and second electrodes spaced apart from each other, the light emitting element disposed between the first electrode and second electrode, a first contact electrode that electrically connects an end of the light emitting element to the first electrode, and a second contact electrode that electrically connects another end of the light emitting element to the second electrode. Each of sub-pixels includes a first area in which the pixel circuit layer is disposed, and a second area adjacent to the first area. The second area includes a transmission area through which the light passes.