Under-Display Sensor Pixel Layout for Luminance Uniformity
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Solution Overview
Problem
Existing display devices face challenges in maintaining image quality and sensor functionality due to luminance differences and reduced pixel density in non-display areas, particularly when minimizing bezel size for a full-screen display.
Innovation Solution
A display device with a pixel array structure where pixel density varies across different display areas, including a first area with lower density for sensor overlap, a second area with higher density, and a third area with gradually increasing density to mitigate luminance differences, enhancing image quality and sensor sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel of the display device is made narrower to achieve full-screen display, then the display area is increased and the device modernity is improved, but the sensor cannot be properly positioned and the luminance control becomes difficult
Solution Approach 1:
The patent positions the sensor not in the traditional lateral bezel area but in the first display area at the top center position, utilizing the vertical dimension of the display area. This dimensional repositioning allows the sensor to be integrated into the full-screen display without requiring lateral bezel space, thereby achieving both full-screen display and proper sensor positioning.
Solution Approach 2:
The patent creates a first display area with distinct local characteristics (lower pixel density, different luminance properties) specifically designed to accommodate the sensor. This localized area with specialized properties allows the sensor to function properly while maintaining high pixel density in other display areas for image quality.
2Ease of manufacture
If the pixel density is made uniform across all display areas, then the manufacturing is simplified, but the luminance difference between areas cannot be minimized
Solution Approach 1:
The patent applies different pixel density values to different display areas: a first pixel density in the first display area (lower), a second pixel density in the second display area (higher), and a third pixel density in the third display area (intermediate). This local differentiation of pixel density allows each area to have optimized luminance characteristics, minimizing sudden luminance transitions while maintaining manufacturing feasibility through systematic variation.
Solution Approach 2:
The patent systematically varies the pixel density parameter across different display areas to control luminance distribution. By changing the pixel density from the first area to the second area through the intermediate third area, the patent achieves gradual luminance transition and minimizes perceived brightness differences without requiring complex manufacturing processes.
3Illumination intensity
If the pixel density in the third display area is increased to reduce luminance difference, then the image quality is improved, but the number of pixels increases leading to higher manufacturing complexity
Solution Approach 1:
The patent divides the display area into three distinct segments (first, second, and third display areas), each with its own pixel density characteristics. This segmentation allows the patent to optimize luminance distribution by creating an intermediate transition zone (third display area) with moderate pixel density, avoiding the need for uniformly high pixel density across the entire display and thereby reducing overall manufacturing complexity.
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 solution improves image quality by minimizing perceived luminance differences and maintains sensor sensitivity, enabling a full-screen display with integrated camera and biometric functions.
Implementation Method 1
a sensor which is interposed between the substrate and the first display area of the display panel and senses an external object through the first display area
Data Source
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AI summary
A display device includes a substrate, a display panel including a first display area, a second display area, and a third display area between the first and second display areas, each of the first, second, and third display areas including a plurality of pixels, and a sensor which is between the substrate and the first display area of the display panel and senses an external object through the first display area. A first pixel density of the first display area is less than a second pixel density of the second display area, and a pixel density of the third display area varies with relative distances from the first display area.