Under-Display Camera Pixel Density and Touch Electrode Design
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Solution Overview
Problem
Existing display devices face challenges in implementing a full-screen display due to the attachment of optical units like cameras, which reduces the active display panel area and deteriorates light transmittance and touch sensing performance.
Innovation Solution
A display device design that assigns a low-resolution imaging area for the camera and sensors under the display panel, with a separate area for high-resolution pixels, and uses a mutual-capacitive touch sensing scheme with differently sized touch electrodes to maintain performance and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera module is attached to the display device, then imaging function is provided, but the active area of the display panel is reduced
Solution Approach 1:
The patent relocates the camera module from the front surface (2D plane) to the rear surface of the display device, utilizing the third dimension (depth/thickness) to resolve the spatial conflict between the camera and display area. This allows the camera to be positioned in a location that does not obstruct the display panel's active area while still enabling light transmission through the display structure.
2Area of stationary object
If pixels are disposed in the imaging area, then full-screen display is implemented, but light transmittance is lowered
Solution Approach 1:
The patent implements different pixel densities in different regions of the display panel. The first area (surrounding the imaging area) has a first pixel density, while the second area (imaging area) has a second pixel density that is lower than the first. This local differentiation allows the imaging area to transmit sufficient light to the camera while maintaining high display resolution in the non-imaging areas.
3Ease of operation
If touch sensing portions are disposed in the imaging area, then touch sensing is provided, but light transmittance and sensor performance are deteriorated
Solution Approach 1:
The patent implements different touch sensing portion densities in different regions. The first touch sensing portion is disposed in the first area with a first density, while the second touch sensing portion is disposed in the second area (imaging area) with a second density lower than the first. This ensures adequate touch sensing coverage in the imaging area while minimizing obstruction to light transmission to the camera sensor.
4Use of energy by moving object
If the second pixel density is lowered to improve light transmittance, then camera performance is improved, but display resolution in the imaging area is reduced
Solution Approach 1:
The patent changes the pixel density parameter spatially across the display panel, creating a gradient or stepped structure where pixel density varies by region. This allows optimization of light transmittance in the imaging area while maintaining high resolution in the display area, effectively managing the trade-off between these two competing requirements through parameter differentiation.
Data Source
AI summary
A display panel with a first area and a second area, may include: an encapsulation layer disposed over a substrate in the first area and the second area; a bank disposed between the substrate and the encapsulation layer in the first area and the second area; a touch buffer layer disposed over the encapsulation layer; a first touch sensing portion disposed over the touch buffer layer in the first area; and a second touch sensing portion disposed over the touch buffer layer in the second area. An overlapping area between the bank in the first area and the first touch sensing portion may be different from an overlapping area between the bank in the second area and the second touch sensing portion.