Gate Line Voltage Compensation for Display Devices
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Solution Overview
Problem
Display devices face image quality degradation due to voltage drops in gate lines, which occur based on line length and temperature changes, affecting transistor operation and overall image quality.
Innovation Solution
A display device with a gate line voltage compensator that calculates a voltage compensation value by comparing the reference voltage to the voltage dropped along the gate line, adding this value to the reference voltage to maintain optimal operation, thereby compensating for voltage drops across the gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gate line length is increased to cover larger display areas, then the display area is improved, but voltage drop increases causing image quality degradation
Solution Approach 1:
The gate line voltage compensation is segmented into multiple sampling points along the gate line. The voltage compensator measures voltage at different locations (e.g., first end, middle, second end) and applies differentiated compensation values to each segment, allowing the system to maintain proper voltage levels across large display areas while managing the inherent voltage drop in longer gate lines
Solution Approach 2:
A feedback mechanism is implemented where the voltage compensator continuously monitors the actual voltage at multiple points along the gate line and adjusts the compensation voltage accordingly. The compensator calculates the difference between reference voltage and measured voltage, then applies the appropriate compensation to maintain stable transistor operation across the entire display area
2Reliability
If the reference voltage is increased to compensate for voltage drop, then transistor operation is improved, but power consumption increases
Solution Approach 1:
Instead of uniformly increasing the reference voltage across the entire gate line, the system applies localized compensation at specific sampling points. The voltage compensator measures voltage at different locations and applies compensation only where needed, maintaining proper transistor operation while avoiding unnecessary power consumption in areas where voltage levels are already adequate
Solution Approach 2:
The system dynamically adjusts the compensation voltage parameter based on measured conditions rather than using a fixed increased reference voltage. By calculating the actual voltage drop at each sampling point and applying proportional compensation, the system maintains reliable transistor operation while optimizing power consumption according to actual needs
3Manufacturing precision
If voltage compensation is applied to all gate lines simultaneously, then image quality is improved, but device complexity increases
Solution Approach 1:
The voltage compensation system is segmented into multiple independent sampling points along each gate line, with each point having its own measurement and compensation capability. This modular approach allows the system to maintain image quality across the entire display while managing complexity through distributed, independent measurement points rather than a single complex centralized system
Solution Approach 2:
The system can apply compensation to all gate lines simultaneously when needed for maximum image quality, but the segmented architecture allows for selective activation of compensation at different sampling points. This partial action capability reduces overall system complexity while maintaining the option for full compensation when required
Data Source
AI summary
The present inventive concept is related to a display device in which a compensated voltage is applied to a gate line by compensating for a voltage drop of a voltage applied to the gate line.