Display Panel Pixel Density Zoning 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 pixel per inch (PPI) and transmittance loss from touch electrodes, hindering the implementation of a full-screen display.
Innovation Solution
A display panel design with a multi-resolution structure, where pixels and touch sensors are divided into regions based on sensor arrangement, optimizing electrode densities and sensor placement to minimize image quality degradation and improve display competitiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing region with lower PPI is disposed in the screen to accommodate a camera, then the camera can be integrated, but image quality deteriorates and spots appear at the boundary between pixel region and sensing region
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions with different pixel densities. The first pixel region has a first pixel density while the second pixel region has a second pixel density that is different from the first. This allows each region to be optimized for its specific function: the first region maintains high image quality for display, while the second region provides sufficient resolution for sensor operations, thereby resolving the contradiction between camera integration and image quality.
2Adaptability or versatility
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 patent implements local quality by configuring touch electrodes with different densities in different regions. In the first pixel region, touch electrodes are arranged with a first density, while in the second pixel region, they are arranged with a second density that differs from the first. This regional differentiation allows the sensing region to maintain sufficient transmittance for sensor operation while still providing adequate touch sensing capability, thus resolving the contradiction between touch functionality and transmittance.
3Illumination intensity
If the pixel density is reduced in the sensing region to improve light transmittance, then optical characteristics for the sensor are secured, but the sensing region area increases
Solution Approach 1:
The patent applies parameter changes by varying the pixel density parameter across different regions of the display panel. The first pixel region maintains a first pixel density while the second pixel region uses a second pixel density that is different from the first. This parameter differentiation optimizes light transmittance in the sensing region for sensor operation while controlling the sensing region area through precise boundary definition, thereby resolving the contradiction between light transmittance and sensing region area.
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.