Display Panel Demultiplexer Capacitance for Uniform Brightness
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Solution Overview
Problem
Medium and large-sized special-shaped display screens experience significant differences in brightness across areas due to voltage jumps in demultiplexer circuits, leading to uneven display quality.
Innovation Solution
A display panel design with data lines of varying lengths and demultiplexers connected between source and data lines, where each demultiplexer comprises multiple transistors with different rated capacitances to equalize voltage jumps across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a demultiplexer circuit is disposed between the source driver and display area to reduce the number of output pins, then the width of the lower border is reduced, but significant differences in data line lengths cause large voltage jumps and brightness differences in different areas
Solution Approach 1:
The patent applies local quality by configuring different rated capacitance values for different demultiplexers based on their specific data line characteristics. Each demultiplexer is customized with a rated capacitance that compensates for the specific length and capacitance of its connected data line, thereby locally optimizing voltage stability and brightness uniformity across different display areas.
Solution Approach 2:
The patent changes the parameter of rated capacitance to resolve the voltage jump issue. By adjusting the rated capacitance value of each demultiplexer according to its data line's physical characteristics (length and capacitance), the system compensates for signal degradation and voltage variations, ensuring uniform brightness across the display area while maintaining the reduced output pin configuration.
2Area of stationary object
If data lines of different lengths are used to connect to different areas of the display, then the display area can be expanded, but the voltage jump difference causes brightness to jump by greatly different amounts
Solution Approach 1:
The patent implements local quality by tailoring the rated capacitance of each demultiplexer to the specific requirements of its connected data line and display area. This localized parameter adjustment ensures that each region of the display, regardless of data line length, receives appropriately compensated signals for uniform brightness.
Solution Approach 2:
The patent utilizes parameter changes by varying the rated capacitance values across different demultiplexers based on their data line characteristics. This parameter optimization allows the display area to be expanded while maintaining brightness uniformity by compensating for the effects of different data line lengths through customized capacitance values.
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 design ensures uniform brightness across the display screen by matching voltage jumps on data lines, thereby improving display uniformity.
Implementation Method 1
a first rated capacitance is formed between the first data line and the gate of the first transistor, a second rated capacitance is formed between the second data line and the gate of the second transistor
Data Source
AI summary
A display panel and an electronic terminal are provided. A longer first data line and a shorter second data line are arranged in a display area, source lines are arranged in a non-display area, a first transistor and a second transistor are connected to the respective source lines (the first transistor is also connected to the first data line to form a higher first rated capacitance, and the second transistor is also connected to the second data line to form a lower second rated capacitance).