Aged Wiring Prevents Leakage Current in High Density Display Pixels
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Solution Overview
Problem
Wearable devices such as head-mounted displays (HMDs) and AR glasses require high pixel density to prevent dizziness, leading to unintended leakage current between adjacent pixels, causing color crosstalk.
Innovation Solution
A display device with a semiconductor wafer substrate and a light emitting element layer that includes a pixel defining film, independent pixel electrodes, aging wiring, and a light emitting layer with an aged portion to increase the resistance of conductive layers between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel density is increased to at least 2000 PPI, then the display quality and user comfort are improved, but the distance between adjacent pixels is reduced causing unintended leakage current and color crosstalk
Solution Approach 1:
The pixel defining film is divided into multiple opening types: first openings for pixel electrodes, second openings for first aging wirings, and third openings for second aging wirings. This segmentation allows independent placement of different functional elements between adjacent pixels to prevent leakage current paths.
Solution Approach 2:
Aging wirings are introduced as intermediary conductive structures positioned between adjacent pixels. These aging wirings create controlled high-resistance regions through aging treatment, acting as mediators that block unintended leakage current while maintaining display functionality.
2Productivity
If conductive layers are added between pixel electrodes and common electrode, then the light emitting function is improved, but leakage current increases causing color crosstalk between adjacent pixels
Solution Approach 1:
The pixel defining film structure is differentiated with specific openings positioned at different locations: first openings centered for pixel electrodes, second openings offset for first aging wirings, and third openings offset for second aging wirings. This local differentiation creates targeted high-resistance zones that block crosstalk while preserving light emission paths.
Solution Approach 2:
The aging wirings are pre-positioned between adjacent pixels during manufacturing, and subsequently subjected to aging treatment that increases their resistance. This preliminary arrangement and treatment creates pre-established barriers against leakage current and color crosstalk before the display operates.
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 leakage current and color crosstalk between adjacent pixels, ensuring improved display quality and user experience in wearable devices.
Implementation Method 1
A portion positioned between the aging wiring and the common electrode of the light emitting layer may include an aged portion in which at least a portion of a conductive layer included in the light emitting layer is aged.
Implementation Method 2
The aged portion of the light emitting layer has a higher resistance of the conductive layer compared to other portions of the light emitting layer.
Data Source
AI summary
According to an embodiment, a display device may include a semiconductor wafer substrate, a complementary metal oxide semiconductor (CMOS) circuit layer disposed on the semiconductor wafer substrate, and a light emitting element layer disposed on the CMOS circuit layer. The light emitting element layer may include a pixel defining film partitioning a plurality of pixels, a pixel electrode disposed independently in each of the plurality of pixels, an aging wiring disposed between the plurality of pixels, a light emitting layer commonly covering the pixel electrodes of each of the plurality of pixels and the aging wiring, and a common electrode covering the light emitting layer. A portion positioned between the aging wiring and the common electrode of the light emitting layer may include an aged portion in which at least a portion of a conductive layer included in the light emitting layer is aged.