Display Device Touch Sensor Black Matrix Reflectance
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Solution Overview
Problem
Display devices with embedded touch sensors face issues with increased reflectance due to the presence of metal in touch sensors, leading to reduced image quality, especially when a black matrix is used to mitigate reflection.
Innovation Solution
A display device structure where a touch sensor and a black matrix are disposed in a space between the color filters, allowing the black matrix to be formed at a desired height without increasing the overall size of the display device, thereby reducing reflectance and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is disposed on touch sensors to reduce reflectance, then image quality is improved, but a step difference occurs in the black matrix due to the height of the touch sensor, causing increased reflectance in the area with smaller height
Solution Approach 1:
The patent applies local quality by creating a recessed portion in the insulating layer specifically at the location where the touch sensor is disposed. This localized structural modification allows the black matrix to achieve uniform height across different areas (with and without touch sensors) by compensating for the touch sensor height through the recessed portion, thereby eliminating the step difference and ensuring consistent reflectance reduction throughout the display device.
2Object-affected harmful factors
If the black matrix height is increased to reduce reflectance, then image quality is improved, but the overall size of the display device increases
Solution Approach 1:
The patent applies dimensionality change by creating a recessed portion (vertical dimension modification) in the insulating layer rather than increasing the black matrix height in the overall display device thickness. This allows the black matrix to achieve the necessary height for reflectance reduction locally at the touch sensor area without proportionally increasing the entire display device size, as the recessed portion is contained within the existing layer structure.
3Ease of manufacture
If touch sensors are embedded in the display panel to simplify manufacturing, then manufacturing complexity is reduced, but reflectance increases due to metal in touch sensors
Solution Approach 1:
The patent introduces a black matrix as an intermediary element that is disposed on the touch sensor within the recessed portion of the insulating layer. This black matrix acts as a mediator that blocks the reflective metal surface of the touch sensor from being visible, thereby reducing reflectance while maintaining the embedded touch sensor structure that simplifies manufacturing. The black matrix serves as a protective layer that reconciles the conflict between manufacturing simplicity and optical performance.
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 solution effectively reduces reflectance and prevents a decrease in image quality by allowing the black matrix to be positioned at a desired height, even in areas with touch sensors, without increasing the display device's size.
Implementation Method 1
a black matrix covering the touch sensor in the first recessed portion of the insulating layer
Data Source
AI summary
A display device includes: a substrate including a plurality of light emitting areas and a plurality of non-light emitting areas respectively between the light emitting areas; a first buffer layer over the substrate; a plurality of color filters on the first buffer layer and respectively over the light emitting areas, the color filters being spaced apart from each other; a bridge on the first buffer layer in a space between two adjacent color filters among the color filters; an insulating layer covering the first buffer layer, the color filters, and the bridge, and having a first recessed portion over the bridge in the space between the two adjacent color filters; a touch sensor in the first recessed portion of the insulating layer; and a black matrix covering the touch sensor in the first recessed portion of the insulating layer.