Display Panel Compensation Control for Stable Light-Emitting Modes
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Solution Overview
Problem
Existing display devices cause user discomfort due to frequent changes in light-emitting modes when compensating for self-luminous element degradation, leading to a sense of strangeness during video display.
Innovation Solution
A control device for a display panel that measures luminescence characteristics of self-luminous elements at a lower frequency than operating characteristics of transistors, using a measuring unit and correction unit to adjust input video signals based on luminescence and operating data, reducing the frequency of light-emitting mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measuring unit measures the luminescence characteristic frequently to compensate for self-luminous element degradation, then the compensation accuracy is improved, but the user experiences a sense of strangeness due to frequent light-emitting mode changes
Solution Approach 1:
The measuring unit measures the luminescence characteristic at a lower frequency (e.g., once every few seconds or minutes) rather than continuously or at the same frequency as transistor measurement. This periodic measurement approach maintains adequate compensation accuracy while significantly reducing the frequency of light-emitting mode changes, thereby eliminating user discomfort during video display.
2Speed
If the measuring unit measures both luminescence characteristic and operating characteristic at the same high frequency, then the compensation response speed is improved, but the self-luminous element is caused to emit light in different light-emitting modes frequently
Solution Approach 1:
The measurement process is segmented into two distinct frequency domains: transistor operating characteristic measurement occurs at a high frequency for rapid response, while luminescence characteristic measurement occurs at a lower frequency to maintain light-emitting mode stability. This segmentation allows each measurement type to operate at its optimal frequency without interfering with the other.
Solution Approach 2:
The luminescence characteristic measurement is performed periodically at a lower frequency (e.g., 1 Hz or lower) compared to the transistor measurement frequency. This periodic action ensures that the self-luminous element does not frequently switch light-emitting modes, maintaining display stability while still providing timely compensation for degradation.
3Object-affected harmful factors
If the measuring unit measures the luminescence characteristic at a lower frequency, then the user discomfort is reduced, but the compensation for self-luminous element degradation may be delayed
Solution Approach 1:
The system performs preliminary measurement and calibration of the luminescence characteristic during manufacturing or initial operation to establish baseline data. This preliminary action allows the system to predict degradation trends and prepare compensation parameters in advance, reducing the impact of lower measurement frequency during normal operation.
Solution Approach 2:
The system continuously monitors transistor operating characteristics at high frequency and uses this feedback to detect early signs of self-luminous element degradation. When degradation is detected, the system triggers a luminescence measurement to update compensation parameters, ensuring timely compensation without requiring continuous high-frequency luminescence measurement.
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 self-luminous element degradation while minimizing user discomfort by reducing the frequency of light-emitting mode changes, thus enhancing the display experience.
Implementation Method 1
Each subpixel includes a self-luminous element such as an OLED (organic light-emitting diode) or a QLED (quantum-dot light-emitting diode)
Data Source
AI summary
A control device for a display panel includes a plurality of pixels each including: a self-luminous element; and a transistor that controls a current that flows through the self-luminous element, the control device including: a measuring unit configured to measure a luminescence characteristic of the self-luminous element and an operating characteristic of the transistor; and a correction unit configured to correct an input video signal that enables identifying a video to be displayed on the display panel, based on luminescence data related to the luminescence characteristic and operation data related to the operating characteristic, wherein the measuring unit measures the luminescence characteristic at a frequency that is lower than a frequency at which the measuring unit measures the operating characteristic.