Touch Panel Display Device Touch Influence Compensation
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Solution Overview
Problem
Organic EL display devices with touch panels face degradation in display quality due to temperature increases caused by touch, which affect current measurements and input image signal correction, leading to variations in luminance and burn-in issues.
Innovation Solution
A display device with a touch panel that includes a determination circuit to identify whether the characteristic detection process is influenced by touch, allowing the display control circuit to pause or resume the characteristic detection process accordingly, ensuring compensation is performed using unaffected data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the characteristic detection process is performed continuously to compensate for degradation, then display quality is maintained, but touch-induced temperature variations cause measurement errors and degrade compensation accuracy
Solution Approach 1:
The patent applies preliminary action by detecting touch input before performing the characteristic detection process. The control circuit checks for touch input in advance, and only proceeds with current measurement when no touch is detected, thereby preventing temperature-induced measurement errors before they occur
Solution Approach 2:
The patent implements feedback by continuously monitoring touch panel output signals and using this information to control whether the characteristic detection process should be executed. The control circuit adjusts the measurement process based on real-time touch detection feedback, stopping measurements when touch is detected
2Measurement precision
If the characteristic detection process is stopped when touch is detected, then measurement accuracy is maintained, but compensation may not be performed timely, potentially affecting display quality
Solution Approach 1:
The system performs preliminary touch detection before initiating characteristic detection, ensuring that measurements only occur when touch conditions are absent. This preliminary check prevents compromised measurements while maintaining a systematic approach to compensation timing
Solution Approach 2:
The patent employs periodic action by repeatedly performing characteristic detection across multiple frames when touch conditions permit. The system checks touch status continuously and executes measurements in periodic intervals when conditions are favorable, ensuring compensation occurs as frequently as possible without compromising accuracy
3Productivity
If current measurement is performed during touch, then compensation can be maintained, but temperature-influenced data leads to incorrect input image signal correction and luminance variations
Solution Approach 1:
The control circuit performs preliminary detection of touch input before initiating the characteristic detection process. By checking touch status in advance and only proceeding with current measurement when no touch is detected, the system prevents temperature-influenced measurements from corrupting compensation data
Solution Approach 2:
The system uses touch panel output signals as feedback to control the characteristic detection process. When touch input is detected, the control circuit stops or skips the measurement process, using this feedback mechanism to prevent incorrect data from being used in input image signal correction
Data Source
AI summary
Regarding a display device (a display device including display elements driven by currents) equipped with a touch panel, degradation in display quality caused by touch is suppressed. A display device equipped with a touch panel is provided with a determination circuit (303) that determines whether or not a characteristic detection process is influenced by touch, based on a touch position and a monitoring target row which is a row to be subjected to the characteristic detection process. When the determination circuit (303) determines that the characteristic detection process is influenced by touch, a display control circuit (301) controls operation of a gate driver (12) and a source driver (20) such that a normal characteristic detection process is stopped until the determination circuit (303) determines that the characteristic detection process is not influenced by touch.