Multi-Region Display Panel Layout for Under-Display Sensors
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Solution Overview
Problem
The integration of a camera in a smartphone limits the screen design, leading to image quality deterioration and visibility issues in the sensing region due to differences in pixels per inch (PPI) and transmittance loss from touch electrodes, hindering the implementation of a full-screen display.
Innovation Solution
A display panel design that divides pixel units and touch sensor units into multiple regions, varying pixel and electrode densities to minimize image quality degradation, with optical characteristics optimized by reducing electrode density in sensor regions and integrating sensors as a module on the display panel's back surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera is integrated into a smartphone to improve multi-media functions, then the camera resolution and functionality are enhanced, but the screen design is limited and cannot achieve full-screen display
Solution Approach 1:
The patent moves the camera from the front screen area to the back surface of the display panel, utilizing the z-dimension (depth) rather than the x-y plane. This allows the camera to be positioned at a location that does not occupy screen real estate, enabling full-screen display while maintaining camera functionality.
Solution Approach 2:
The camera is nested within the display panel structure itself, specifically positioned on the back surface and integrated with the pixel units and touch sensor units. This nesting allows the camera to share the same structural space as the display components without interfering with the front screen area.
2Area of stationary object
If pixels with lower PPI are disposed in a sensing region to accommodate a camera, then space is saved, but image quality deteriorates and spots are recognized at boundary portions
Solution Approach 1:
The patent applies different pixel densities locally to different regions: higher PPI in display regions for quality and lower PPI in sensing regions for camera accommodation. The boundary between these regions is carefully managed with buffer zones to prevent visible artifacts, ensuring each region has the appropriate quality for its function.
Solution Approach 2:
The display panel is segmented into distinct regions: display regions with higher pixel density for visual output, sensing regions with lower pixel density for camera integration, and boundary regions with buffer zones. This segmentation allows optimization of each region for its specific function while managing the transitions between them.
3Ease of operation
If touch electrodes are disposed on the display panel to enable touch sensing, then touch functionality is achieved, but transmittance is lost and image quality in the sensing region deteriorates
Solution Approach 1:
The touch electrode density is optimized locally for different regions: higher density in display regions for accurate touch detection and lower density in sensing regions to maximize light transmittance. This local optimization allows touch functionality where needed while minimizing interference with camera operation in the sensing region.
Data Source
AI summary
The present disclosure is related to a display panel for interfacing with a plurality of sensors that are attached to a bottom surface of the display panel. The display panel includes a light emitting layer configured to output images, and a protective layer configured to protect the display panel. The light emitting layer includes a display region having a first pixel density, a first transmissive region having a second pixel density that is less than the first pixel density, and a second transmissive region having a third pixel density that is less than the second pixel density. The first transmissive region is configured to interface with a first sensor and the second transmissive region is configured to interface with a second sensor, wherein a function of the first sensor requires less light than a function of the second sensor.