Display Device Conductive Pattern Light Blocking Layer
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Solution Overview
Problem
The increasing demand for high-resolution display devices with reduced pixel size complicates the circuit structure, necessitating improved reliability and efficient light management while integrating touch sensing capabilities.
Innovation Solution
A display device design featuring a substrate with a pixel area and peripheral region, including a conductive pattern that overlaps the pixel circuit and serves as a light-blocking layer, incorporating a sensing unit with a capacitance-changing electrode for touch detection, and a layered structure for signal transmission and capacitance read-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to achieve high resolution, then display resolution is improved, but circuit structure becomes more complicated and reliability deteriorates
Solution Approach 1:
The pixel structure is divided into distinct functional regions: a first region containing the pixel circuit and a second region containing the touch sensing unit. This segmentation allows independent optimization of each region, enabling high-resolution display while maintaining circuit reliability through dedicated circuit placement and reduced interference.
Solution Approach 2:
The invention transitions from planar integration to three-dimensional stacking by placing the pixel circuit, touch sensing unit, and light blocking layer at different vertical levels. The pixel circuit is formed in a first region, the touch sensing unit in a second region, and a light blocking layer is disposed between them, creating vertical separation that reduces circuit complexity while maintaining high resolution.
2Measurement precision
If pixel size is reduced to achieve high resolution, then display resolution is improved, but light management becomes more difficult
Solution Approach 1:
Light management is simplified by introducing a light blocking layer in the vertical dimension between the pixel circuit and touch sensing unit. This layer selectively blocks light in the wavelength range of 400-500 nm, preventing light interference with the pixel circuit while allowing other wavelengths to pass through, thereby simplifying light management in high-resolution displays.
Solution Approach 2:
The light blocking layer is applied selectively in specific regions where light interference is most problematic. Rather than blocking all light uniformly, the layer is positioned to block only the harmful 400-500 nm wavelength range that could interfere with the pixel circuit, while allowing other wavelengths to pass through for normal display operation.
3Adaptability or versatility
If touch sensing unit is integrated into the pixel structure, then touch sensing capability is improved, but light interference with the pixel circuit increases
Solution Approach 1:
The touch sensing unit is positioned in a second region at a different vertical level from the pixel circuit in the first region. A light blocking layer is disposed between these regions to prevent light from reaching the pixel circuit. This vertical separation in three-dimensional space allows both touch sensing and display functions to coexist without light interference.
Solution Approach 2:
A light blocking layer is introduced as an intermediary element between the touch sensing unit and the pixel circuit. This layer specifically blocks light in the 400-500 nm wavelength range, acting as a mediator that prevents harmful light from reaching the pixel circuit while allowing the touch sensing unit to function normally above it.
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
Enhances the reliability and light management of display devices by preventing rear surface light transmission to the pixel circuit, ensuring stable operation and improved touch sensing capabilities.
Implementation Method 1
the conductive pattern may include a light blocking layer which blocks light from being drawn from a rear surface of the substrate on which the pixel circuit is not disposed
Implementation Method 2
the conductive pattern may include a sensing electrode which changes in capacitance in response to a touch of a user
Data Source
AI summary
A display device includes a substrate including a pixel area, and a peripheral area enclosing at least one side of the pixel area, a plurality of pixels provided in the pixel area, each of the plurality of pixels including a light-emitting area from which light is emitted, a light-emitting element which is provided in each of plurality of the pixels and which emits the light, a pixel circuit which is provided in each of the plurality of pixels and which drives the light-emitting element, and a conductive pattern which is disposed between the substrate and the pixel circuit and which overlap the pixel circuit in a plan view. Pixels of the plurality of pixels each may include a sensing unit which is electrically connected to the conductive pattern and which senses a touch of a user.