Compensation Capacitors Stabilize LCD Common Voltage
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Solution Overview
Problem
The uniformity of the common voltage in liquid crystal display (LCD) panels is often unstable, leading to image flicker and poor display performance, as existing solutions like gate pulse driving signals with shading waveforms are not effective in addressing this issue.
Innovation Solution
The implementation of compensation capacitors in the non-display area of the LCD panel, connected between pixel structures and driving devices, helps to stabilize the common voltage by preventing coupling effects from data and scan line voltages, ensuring uniformity and reducing image flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate pulse driving signals with shading waveforms are used to adjust common voltage uniformity, then display performance is intended to be improved, but the method is not effective and fails to resolve the flicker issue
Solution Approach 1:
The patent extracts the problematic coupling effect between data/scan line voltages and common voltage by introducing compensation capacitors that isolate these voltage variations. The compensation capacitors are specifically placed to prevent the coupling of voltage changes from data lines and scan lines into the common voltage node, thereby separating the common voltage from the influence of driving signals.
Solution Approach 2:
The compensation capacitors act as intermediary elements between the pixel structures and the driving devices. These capacitors mediate the voltage relationships by providing a compensation mechanism that counteracts the coupling effects, serving as a buffer that prevents direct transmission of voltage variations from the driving circuitry to the common voltage node.
2Reliability
If compensation capacitors are added to prevent coupling effects, then common voltage uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the compensation capacitor structure with existing panel components by forming capacitor electrode lines that extend from the non-display area and integrate with the scan lines and data lines. The compensation capacitors are positioned to overlap with existing line structures, combining multiple functions into integrated structures rather than adding completely separate components.
Solution Approach 2:
The capacitor electrode lines serve multiple functions: they act as common voltage lines in the non-display area, provide coupling paths for compensation capacitors, and extend into the display area to connect with pixel structures. This multi-functionality reduces the need for separate dedicated structures for each function.
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 arrangement of compensation capacitors improves the uniformity of the common voltage, thereby reducing image flicker and enhancing the overall display performance of the LCD panel.
Implementation Method 1
a plurality of compensation capacitors, wherein one end of each of the plurality of compensation capacitors is electrically connected to one of the plurality of scan lines, and the other end of each of the plurality of compensation capacitors is electrically connected to one of the plurality of capacitor electrode lines
Data Source
AI summary
A display panel has a display area and a non-display area surrounding the display area, and the display panel includes scan lines, data lines, pixel structures, at least one driving device, capacitor electrode lines, and compensation capacitors. Each pixel structure includes an active device, a pixel electrode, and a storage capacitor. The driving device is located in the non-display area and is electrically connected to the pixel structures. The capacitor electrode lines extend to the display area from the non-display area and are electrically connected to the storage capacitors of the pixel structures. The compensation capacitors are located in the non-display area and between the pixel structures and the driving device. Two ends of each of the compensation capacitor are electrically connected to one of the scan lines and one of the capacitor electrode lines, respectively.