Display Panel Compensation Lines for Under-Camera Brightness Uniformity
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Solution Overview
Problem
Existing display panels face challenges in achieving uniform brightness and reducing horizontal hole mura due to differences in loading between pixel circuits in different display regions, particularly when incorporating optical components like cameras.
Innovation Solution
The display panel design includes a structure with connecting line groups and compensation line groups arranged in specific configurations to balance the loading between main and secondary display regions, using compensation lines connected to a constant voltage signal to align with connecting lines, thereby reducing differences in pixel circuit loading and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting lines are extended from the secondary display region to the main display region to drive light-emitting devices, then the light-emitting devices can be driven to emit light, but the loading difference between pixel circuits in different regions causes brightness non-uniformity and horizontal hole mura
Solution Approach 1:
The patent introduces compensation lines as intermediary elements between the pixel circuits and the light-emitting devices in the secondary display region. These compensation lines are connected to constant voltage signal lines and serve to balance the loading differences caused by the long connecting lines, thereby maintaining brightness uniformity across different display regions while enabling the light-emitting devices to function properly
Solution Approach 2:
The patent modifies the electrical parameters of the pixel circuits by adding compensation lines that adjust the capacitive loading. By changing the equivalent capacitance seen by pixel circuits in different regions through the compensation mechanism, the brightness uniformity is improved while maintaining the light emission function of the secondary display region
2Adaptability or versatility
If the display panel includes a secondary display region with optical components, then full display with camera is achieved, but the loading difference between pixel circuits causes horizontal hole mura
Solution Approach 1:
The compensation lines act as intermediary elements that mediate between the pixel circuits and the light-emitting devices in the secondary display region. By introducing these intermediate compensation pathways connected to constant voltage signals, the loading imbalance caused by the camera integration is compensated, maintaining brightness uniformity while enabling full display with camera functionality
Solution Approach 2:
The patent segments the display panel into main display region and secondary display region with different circuit configurations. The secondary display region uses connecting lines extending to the main display region paired with compensation lines, while the main display region uses direct pixel circuit connections, allowing each region to be optimized for its specific function while maintaining overall brightness uniformity
Data Source
AI summary
A display panel includes a main display region and a secondary display region. The display panel includes a substrate, a plurality of light-emitting devices, and a plurality of conductive layers. The plurality of light-emitting devices include a plurality of first light-emitting devices, and the plurality of conductive layers include a plurality of connecting line groups. The first light-emitting devices are located in the secondary display region, and are electrically connected to the pixel circuits located in the first main display region through the connecting line group. The plurality of conductive layers further includes a plurality of compensation line groups. A number of pixel circuits through which connecting lines in an a-th connecting line group pass in a first direction is less than or equal to a number of pixel circuits through which compensation lines in an a-th compensation line group pass in the first direction.