Tapered Insulating Layer Through Holes for Display Pixel Isolation
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Solution Overview
Problem
Existing display devices face challenges in preventing color mixing of light emitted from adjacent pixels while maintaining a low voltage drop due to the partitioning of common electrodes, which hinders high-resolution color image display.
Innovation Solution
A display device configuration featuring an insulating layer with through holes having forwardly and reversely tapered surfaces, arranged to direct light emission between pixels of the same and different colors, and a grating shape with rib portions to prevent color mixing and ensure proper light shielding, along with a method of manufacturing this configuration using specific photosensitive resin layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is formed to have a forwardly tapered shape, then the common electrode is not partitioned and voltage drop is prevented, but light emitted from adjacent pixels travels along the forwardly tapered wall surface and color mixing occurs
Solution Approach 1:
The insulating layer is divided into multiple regions with different shapes: a first region with a forwardly tapered shape over first-direction adjacent pixels, and a second region with a reversely tapered shape over second-direction adjacent pixels. This segmentation allows each region to address specific directional light spreading issues while maintaining overall voltage stability.
Solution Approach 2:
Different portions of the insulating layer are given different local qualities (tapered shapes) according to the specific arrangement and color relationships of adjacent pixels. The forwardly tapered portions prevent color mixing in certain directions, while reversely tapered portions prevent color mixing in other directions, optimizing performance locally for each pixel arrangement.
2Object-generated harmful factors
If the insulating layer is formed to have a reversely tapered shape, then color mixing is prevented, but the common electrode is partitioned and voltage drop occurs
Solution Approach 1:
The insulating layer is segmented into multiple regions with different tapered shapes. The reversely tapered second region prevents color mixing between second-direction adjacent pixels, while the forwardly tapered first region compensates by preventing partitioning issues in the first direction, maintaining overall voltage stability.
Solution Approach 2:
The insulating layer employs asymmetric tapered shapes in different spatial directions. By having forwardly tapered portions in one direction and reversely tapered portions in another direction, the structure creates asymmetric light path control that prevents color mixing while avoiding common electrode partitioning.
3Object-generated harmful factors
If the width of the insulating layer is secured to prevent color mixing, then color mixing is reduced, but high resolution is hindered due to increased space requirements
Solution Approach 1:
Instead of using straight vertical walls, the insulating layer employs curved tapered surfaces (forwardly and reversely tapered shapes). These curved surfaces naturally guide and control light paths, preventing color mixing more effectively than straight walls would, while requiring less horizontal space to achieve the same light isolation.
Solution Approach 2:
The solution moves from controlling light isolation purely in the horizontal plane (by increasing insulating layer width) to utilizing the vertical dimension through tapered shapes. By controlling light paths through vertical tapering, the design achieves color mixing prevention without proportionally increasing the horizontal footprint, thus preserving high resolution.
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 effectively prevents color mixing and voltage drops, enabling high-resolution color image display by directing light emission and providing a light shielding property, thus enhancing the display quality and resolution.
Implementation Method 1
Each of the plurality of through holes have inner surfaces including a forwardly tapered surface, which is inclined in a direction of enlarging the apertures toward a light emitting direction
Implementation Method 2
a reversely tapered surface, which is inclined in a direction of reducing the apertures toward the light emitting direction
Implementation Method 3
a grating shape with rib portions to prevent color mixing and ensure proper light shielding
Data Source
AI summary
A display device, which includes a plurality of unit pixels, includes a plurality of first electrodes respectively corresponding to the plurality of unit pixels, an insulating layer which includes a plurality of through holes, a light emitting element layer, and a second electrode. Each of the plurality of through holes have inner surfaces including a forwardly tapered surface, which is inclined in a direction of enlarging the apertures toward a light emitting direction, and a reversely tapered surface, which is inclined in a direction of reducing the apertures toward the light emitting direction. The forwardly tapered surface is formed between the unit pixels arranged side by side in the first direction. The reversely tapered surface is formed between the unit pixels arranged side by side in the second direction.