Display Panel Compensation Capacitors for Voltage Consistency
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Solution Overview
Problem
In existing display technologies, when the ratio of subpixels exceeds 1:4, the pixel voltage transmission through a multiplexer can lead to inconsistent voltages for subpixels displaying the same color, resulting in bright lines and dark lines on the display panel.
Innovation Solution
A display panel design incorporating compensation capacitors with different capacitance values for subpixels using the same multiplexer, where the capacitance values are related to the cut-off time points of the switches, ensuring that the relationship between the capacitance values is contrary to the turning-on order of the multiplexer, thereby suppressing the appearance of bright and dark lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multiplexer is used to transmit pixel voltage to reduce the number of data channels, then device complexity is reduced, but manufacturing precision deteriorates due to inconsistent voltage transmission causing bright and dark lines
Solution Approach 1:
The patent applies local quality by introducing compensation capacitors with different capacitance values to different subpixels based on their specific position and charging characteristics. Subpixels are divided into different groups (first subpixels and second subpixels) with different capacitance values assigned to compensate for their individual voltage transmission characteristics, thereby achieving uniform display brightness across all subpixels while maintaining the multiplexer structure.
2Productivity
If the ratio of subpixels driven by multiplexer exceeds 1:4, then productivity is improved by driving more subpixels, but manufacturing precision deteriorates due to voltage inconsistency
Solution Approach 1:
The patent applies parameter changes by varying the capacitance values of compensation capacitors according to the specific charging time characteristics of different subpixels. The capacitance values are adjusted based on the cut-off time points of switches, creating a parameter optimization that compensates for voltage inconsistencies even when driving a large number of subpixels through the multiplexer.
3Ease of operation
If different subpixels have different charging times, then ease of operation is improved by flexible switching control, but manufacturing precision deteriorates due to voltage inconsistency causing display defects
Solution Approach 1:
The patent applies preliminary action by pre-configuring compensation capacitors with specific capacitance values before operation, based on the calculated charging time characteristics of each subpixel. This preliminary setup ensures that voltage inconsistencies are compensated in advance, allowing the multiplexer to operate with flexible switching control while maintaining uniform display quality without requiring real-time adjustments.
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 design effectively balances the charging times of subpixels displaying the same color, ensuring consistent voltage transmission and preventing the occurrence of bright and dark lines on the display panel.
Implementation Method 1
A first compensation capacitor is coupled between the first source line and a reference voltage. A capacitance value of the first compensation capacitor is related to a cut-off time point of the first switch. A second compensation capacitor is coupled between the second source line and the reference voltage. A capacitance value of the second compensation capacitor is related to a cut-off time point of the second switch.
Data Source
AI summary
A display panel is provided. A pixel array includes a plurality of first subpixels, a first source line coupled to the first subpixels, a plurality of second subpixels displaying the same with the first subpixels, and a second source line coupled to the second subpixels. A multiplexer circuit includes a first switch coupled between the first source line and a source driver and a second switch coupled between the second source line and the source driver. A first compensation capacitor couples between the first source line and a reference voltage, and a capacitance value thereof is related to a cut-off time point of the first switch. A second compensation capacitor couples between the second source line and the reference voltage, and a capacitance value thereof the second compensation capacitor is related to a cut-off time point of the second switch different from the cut-off time point of the second switch.