OLED Display Substrate Layout for Under-Screen Camera Brightness
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Solution Overview
Problem
In organic light emitting diode (OLED) display devices with under-screen camera designs, the display brightness and current in low-density display regions are significantly lower than in high-density regions, affecting the display effect.
Innovation Solution
A display substrate with a base substrate featuring a first display region of high-density light emitting unit groups and pixel circuit groups, and a second display region of lower-density light emitting unit groups and pixel circuit groups, where multiple pixel circuits drive the same light emitting unit to increase current and brightness, and a third display region for the under-screen camera with reduced pixel density to allow higher light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple pixel circuits are connected to drive the same light emitting unit in low-density regions, then the current and brightness are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple pixel circuits (specifically two pixel circuits) are merged to drive a single light emitting unit in the low-density second display region. This combining approach increases the current and brightness output of each light emitting unit, thereby improving display uniformity across the screen while addressing the brightness deficiency in low-density regions
Solution Approach 2:
The patent implements different driving configurations for different display regions: the first display region uses conventional one-to-one driving (one pixel circuit per light emitting unit), while the second display region uses many-to-one driving (multiple pixel circuits per light emitting unit). This localized differentiation allows each region to have optimized display quality tailored to its specific requirements
2Area of stationary object
If the screen ratio is increased to achieve full screen display, then the appearance is improved, but the under-screen camera region causes non-uniform display density and brightness
Solution Approach 1:
The display substrate is divided into three distinct display regions with different characteristics: the first display region with high-density light emitting units, the second display region with low-density light emitting units that requires enhanced brightness, and the third display region for the under-screen camera with highest light transmittance requirements. Each region is optimized locally to achieve overall screen uniformity
Solution Approach 2:
In the second display region corresponding to the under-screen camera area, multiple pixel circuits are combined to drive each light emitting unit, thereby compensating for the reduced brightness in this region and achieving uniform display effect across the entire screen including the full-screen areas
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
This configuration enhances the current and brightness in low-density regions, achieving a more uniform full-screen display effect while maintaining the appearance of mobile devices by increasing light transmittance in the under-screen camera area.
Implementation Method 1
each of the light emitting units includes a first electrode, a light emitting layer and a second electrode which are arranged in a direction perpendicular to the base substrate
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a first display region and a second display region, the first display region includes first light emitting unit groups and first pixel circuit groups connected with the first light emitting unit groups; the second display region includes second light emitting unit groups and second pixel circuit groups connected with the second light emitting unit groups; a density of the second light emitting unit groups is smaller than that of the first light emitting unit groups. The second pixel circuit groups include first pixel circuit units each including a first pixel circuit and a second pixel circuit, and at least two pixel circuits in the first pixel circuit unit are configured to be electrically connected with a same light emitting unit.