Display Panel Touch Wiring Layout for Under-Screen Camera Clarity
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Solution Overview
Problem
The integration of in-screen camera technology in display panels results in light transmittance issues that affect imaging quality due to slits between signal traces, which interfere with and diffract light, compromising the camera's performance.
Innovation Solution
A display panel design incorporating a touch function layer with strategically positioned touch electrodes that shield these slits, ensuring high light transmittance in the camera region by overlapping their projections with the slits on the base substrate, thereby improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal traces are arranged in the camera region to enable display function, then the display coverage is improved, but light interference and diffraction occur which deteriorates imaging quality
Solution Approach 1:
The screen is divided into a first display region for normal display and a second display region for in-screen camera function. The second display region contains both pixel cell regions for display and light transmitting regions for camera imaging, allowing the screen to be segmented into areas with different functional priorities.
Solution Approach 2:
Different regions of the screen are assigned different qualities and functions. The first display region has high pixel density for display, while the second display region has reduced pixel density and includes light transmitting regions with higher light transmittance for camera imaging, creating local quality variations to resolve the contradiction.
2Manufacturing precision
If pixel density is increased in the camera region to improve display quality, then display resolution is improved, but light transmittance decreases which deteriorates imaging quality
Solution Approach 1:
The pixel density is varied locally across the screen. The first display region maintains high pixel density for display quality, while the second display region has reduced pixel density to create light transmitting regions with higher light transmittance, allowing each region to optimize for its primary function.
Solution Approach 2:
The screen is segmented into pixel cell regions and light transmitting regions within the second display region. This segmentation allows the light transmitting regions to have sufficient light transmittance for camera imaging while adjacent pixel cell regions maintain display functionality.
3Measurement precision
If touch function structures are added to improve touch sensitivity, then touch detection is improved, but light transmittance in camera region decreases which deteriorates imaging quality
Solution Approach 1:
The touch function structures are arranged in specific orientations (first direction and second direction) and positioned to overlap with trace regions rather than light transmitting regions. This spatial arrangement in different dimensions allows touch sensitivity to be maintained while minimizing impact on light transmittance.
Solution Approach 2:
Touch function structures are selectively placed in different regions with different densities and configurations. In the second display region, touch structures are positioned to overlap with trace regions where they can provide touch detection without blocking light paths to the camera sensor.
4Reliability
If trace regions are widened to improve signal transmission, then electrical conductivity is improved, but light transmittance decreases which deteriorates imaging quality
Solution Approach 1:
Signal traces are arranged in specific directions (first direction and second direction) and positioned in trace regions that are strategically located. The traces connect pixel cell regions while being positioned to minimize overlap with light transmitting regions, utilizing spatial arrangement to balance electrical and optical requirements.
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 touch function layer effectively blocks light interference and diffraction, enhancing the imaging quality of the camera region while maintaining high light transmittance, thus improving the screen-to-body ratio and reducing manufacturing costs.
Implementation Method 1
an orthographic projection of a wiring of the touch function layer on the base substrate overlaps with an orthographic projection of the first and second slits on the base substrate
Data Source
AI summary
A display panel includes: a pixel driving circuit layer, an anode layer, a light emitting layer, a cathode layer, an encapsulation layer and a touch function layer sequentially disposed on a base substrate. The display panel includes a plurality of light transmitting regions and a plurality of pixel cell regions, a plurality of traces of the pixel driving circuit layer are connected between adjacent pixel cell regions, and there are slits between adjacent traces. An orthographic projection of a wiring of the touch function layer on the base substrate overlaps with that of the slits on the base substrate. The display panel includes a second display region including the plurality of light transmitting regions and the plurality of pixel cell regions and a first display region. The number of pixel cells per unit area in the first display region is greater than that in the second display region.