Display Substrate Dummy Pixel Voltage Control for Stain Prevention
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Solution Overview
Problem
High-resolution display panels face issues with transmittance and image quality due to the presence of black stains and line stains at the periphery, caused by local strong electric fields attracting ionic impurities and leading to abnormal liquid crystal deflection, especially under high-temperature and high-brightness conditions.
Innovation Solution
A display substrate design with a display region and a frame region, where display pixels and dummy pixels are arranged in an array, with a controlled voltage difference between their electrodes to prevent strong electric fields, ensuring uniform film thickness and reduced voltage differences between display and dummy pixels to avoid ionic impurity aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution display is implemented with smaller pixel pitch, then image quality is improved, but transmittance deteriorates due to increased black matrix area
Solution Approach 1:
The patent divides the display panel into display region and frame region, and further segments the frame region into multiple dummy pixel rows. This segmentation allows the black matrix in the frame region to be functionally utilized as dummy pixels rather than being purely non-display area, thereby improving transmittance while maintaining high resolution in the display region.
Solution Approach 2:
The patent applies different voltage control strategies to different regions: display pixels receive normal driving voltages for image display, while dummy pixels in the frame region receive controlled voltages to prevent ionic impurity aggregation without requiring display function. This local differentiation resolves the contradiction by optimizing each region's function.
2Illumination intensity
If dummy pixels are added in the frame region, then transmittance is improved, but device complexity increases due to additional voltage control requirements
Solution Approach 1:
The patent merges the control of dummy pixels with the existing common electrode structure. The dummy pixels share the common electrode with display pixels, and the voltage control is integrated into the existing driving circuitry through the common voltage line, rather than requiring completely separate control systems.
Solution Approach 2:
The patent changes the voltage parameter applied to dummy pixels dynamically - applying voltage differences during initial stages to prevent ionic impurity aggregation, and adjusting voltages during operation. This parameter control is achieved through existing data lines and common electrodes, avoiding additional hardware complexity.
3Reliability
If voltage difference between display pixels and dummy pixels is reduced, then ionic impurity aggregation is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent creates equipotential conditions between display pixels and dummy pixels by controlling their voltage differences to be similar. This is achieved by connecting both types of pixels to the same common electrode and applying coordinated voltages through data lines, thereby preventing strong electric fields that would attract ionic impurities.
Solution Approach 2:
The patent implements feedback control through the common electrode system, where voltage applied to display pixels and dummy pixels is coordinated. The common electrode voltage serves as a reference that automatically balances the voltage differences, reducing the need for high-precision independent control of each pixel type.
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 effectively prevents the formation of black stains and line stains, improving the display effect by minimizing ionic impurity gathering and maintaining image quality under high-temperature conditions, thus enhancing the reliability and brightness of high-resolution display panels.
Implementation Method 1
a difference between the first voltage difference and the second voltage difference is less than a set value... prevent strong electric fields... local strong electric fields attracting ionic impurities
Implementation Method 2
abnormal liquid crystal deflection... ensuring uniform film thickness and reduced voltage differences between display and dummy pixels to avoid ionic impurity aggregation
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate having a display region and a frame region. The display substrate includes a plurality of display pixels and a plurality of dummy pixels arranged in an array; the display pixels are distributed in the display region; the dummy pixels are distributed in the frame region. Each display pixel includes a first pixel electrode and a first common electrode; and a first voltage difference exists between the first pixel electrode and the first common electrode. Each dummy pixel includes a second pixel electrode and a second common electrode; and a second voltage difference exists between the second pixel electrode and the second common electrode. A difference between the first voltage difference and the second voltage difference is less than a set value. Embodiments of the present disclosure further provides a display panel and a display apparatus.