Display Panel Dummy Pixel Layout for Under-Panel Sensor Uniformity
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Solution Overview
Problem
Existing display devices face challenges in integrating electronic elements such as cameras and sensors within the display area while maintaining uniformity of pattern density and electrical load, leading to non-uniform brightness and potential electrostatic discharge issues.
Innovation Solution
Incorporation of dummy pixels and driving voltage lines that are cut around specific regions, forming a mesh structure to maintain uniformity and protect main pixels, along with a pixel defining layer and common layers to ensure light transmission and electrostatic protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic elements (camera, sensor) are integrated inside the display area, then device functionality is enhanced, but pattern density uniformity deteriorates
Solution Approach 1:
Dummy pixels are introduced as copies of real pixel structures in the non-display area. These dummy pixels replicate the same transistor and capacitor configurations as actual pixels, maintaining consistent pattern density and electrical load characteristics across the entire substrate, thereby resolving the uniformity issue caused by integrating electronic elements in the display area.
Solution Approach 2:
The patent applies different structures to different regions: real pixels with light-emitting elements in the display area, and dummy pixels without light-emitting elements in the non-display area. This local differentiation allows the dummy pixels to match the electrical characteristics of real pixels while serving the specific function of maintaining pattern density uniformity in regions where electronic elements are integrated.
2Reliability
If driving voltage lines are continuous across the display area, then electrical connectivity is maintained, but electrostatic discharge risk increases
Solution Approach 1:
Driving voltage lines are segmented into multiple sections by introducing contact holes and intermediate conductive layers. The voltage lines are divided into first, second, and third portions that are electrically connected through contact holes penetrating insulating layers, creating discrete segments that reduce electrostatic discharge risk while maintaining overall electrical connectivity across the display panel.
Solution Approach 2:
Contact holes and intermediate conductive layers serve as mediators between different portions of driving voltage lines. These intermediary structures allow electrical connection between segmented voltage line portions while providing isolation through insulating layers, thereby reducing direct exposure to electrostatic discharge while maintaining electrical connectivity.
3Manufacturing precision
If dummy pixels are added to maintain pattern density uniformity, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The dummy pixels serve multiple functions simultaneously: they maintain pattern density uniformity, provide electrical load matching, and are structured identically to real pixels for manufacturing consistency. By using the same transistor and capacitor configurations as real pixels, the dummy pixels achieve universality in structure while serving specialized functions in the non-display area.
Data Source
AI summary
A display panel may include a substrate, pixels, dummy pixels, and voltage lines. The substrate may include a first transmission region for light transmission and/or sound transmission, a non-display area surrounding the first transmission region, and a display area surrounding the non-display area. The pixels may be arranged on the display area and may emit light. The dummy pixels may be arranged on the non-display area, may include a first dummy pixel, and may emit no light. The voltage lines may transmit voltages to the pixels and the dummy pixels. The voltage lines may include a first voltage line and a second voltage line. The first voltage line may be spaced from the second voltage line, may be aligned with the second voltage line, and may overlap the first dummy pixel. The first transmission region may be positioned between the first voltage line and the second voltage line.