Display Panel Temperature Compensation via Kickback Voltage
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Solution Overview
Problem
Temperature variations in liquid crystal display panels cause changes in the driving characteristics of semiconductor devices and the dielectric constant of the liquid crystal layer, leading to deteriorated display quality, including flicker phenomena and non-uniform brightness.
Innovation Solution
A display apparatus with dummy pixels and a timing controller that detects kickback voltage to calculate temperature variations, compensating gamma and common voltages using a look-up table to maintain optimal image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel operates at a fixed gamma voltage setting, then the initial display quality is optimized, but the display quality deteriorates when temperature changes occur
Solution Approach 1:
The gamma voltage is changed from a fixed static value to a dynamic value that varies with temperature. The timing controller dynamically selects different gamma voltages from a predetermined set based on the detected temperature, allowing the display panel to adapt its gamma voltage to match operating temperature conditions and maintain optimal display quality across different temperatures
Solution Approach 2:
The invention changes the gamma voltage parameter based on temperature variations. By detecting temperature changes and selecting appropriate gamma voltages from a predetermined set, the system adjusts the electrical parameter (gamma voltage) to compensate for temperature-induced changes in liquid crystal properties, thereby maintaining consistent display quality across different operating temperatures
2Measurement precision
If dummy pixels are added to detect kickback voltage for temperature measurement, then temperature compensation capability is improved, but device complexity increases
Solution Approach 1:
The dummy pixels serve multiple functions: they act as both display pixels and temperature sensing elements. By detecting the kickback voltage generated by the dummy pixels, the system can determine the operating temperature without requiring separate temperature sensors, thereby achieving temperature measurement functionality while minimizing additional structural complexity
Solution Approach 2:
The display panel uses its own dummy pixels to generate and detect kickback voltage for temperature measurement, rather than requiring external temperature sensors. The dummy pixels self-generate the measurement signal through their normal operation, allowing the display panel to autonomously determine its operating temperature and select appropriate gamma voltages
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
Compensates for display quality variations due to temperature changes, improving image stability and brightness uniformity by adjusting voltages and image signals based on calculated temperature differences.
Implementation Method 1
the dielectric constant of the liquid crystal layer may vary
Data Source
AI summary
A display apparatus includes a display panel that includes pixels for receiving data voltages in response to gate signals, and dummy pixels, a driver for driving the pixels and the dummy pixels, a kickback voltage detector for detecting a kickback voltage of the dummy pixels, and a timing controller. The timing controller calculates a temperature corresponding to the kickback voltage, compares the calculated temperature with a reference temperature, and controls the driver to compensate a display panel image quality based on a temperature variation that corresponds to a difference between the calculated temperature and the reference temperature.