Driver Circuit Sensing During Video Driving
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Solution Overview
Problem
Organic light-emitting display devices face issues with non-uniform luminance due to characteristic deviations among driving transistors, leading to image quality degradation, and existing sensing methods are prone to errors from video control driving and fake image driving.
Innovation Solution
A driver circuit and method that accurately detects luminance deviations by using a sensing period with specific voltage control on data and reference voltage lines, preventing sensing errors even during real-time video driving and fake image driving, by maintaining distinct voltages on data lines crossing reference voltage lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing operation is performed during video driving, then real-time luminance compensation is achieved, but sensing errors occur due to voltage changes from video control driving and fake image driving
Solution Approach 1:
The patent applies preliminary action by performing the sensing operation during the blank period before the fake image driving is executed. This timing allows the sensing to be completed before voltage changes from fake image driving occur, preventing sensing errors while still achieving real-time compensation within the frame period
Solution Approach 2:
The patent implements preliminary anti-action by controlling the data driver circuit to maintain data line voltages at levels that prevent electromagnetic coupling interference with the reference voltage line during the sensing period. This preemptive voltage control counteracts potential sensing errors before they can occur
2Manufacturing precision
If fake image driving is performed to improve image quality, then motion blur is reduced, but voltage changes on reference voltage line cause sensing errors
Solution Approach 1:
The sensing operation is executed during the blank period before fake image driving starts, allowing luminance detection to be completed before voltage changes from fake image driving affect the reference voltage line
Solution Approach 2:
The patent introduces a controlling intermediary (data driver circuit) that mediates between the fake image driving operation and the sensing operation by actively controlling data line voltages to prevent electromagnetic coupling with the reference voltage line, thus isolating the sensing process from interference
3Adaptability or versatility
If data lines cross reference voltage lines during sensing, then routing flexibility is improved, but electromagnetic coupling causes voltage changes and sensing errors
Solution Approach 1:
The data driver circuit preemptively controls data line voltages during the sensing period to prevent electromagnetic coupling with the reference voltage line. By maintaining appropriate voltage levels before coupling can occur, the patent counteracts potential sensing errors while preserving routing flexibility
Data Source
AI summary
The present disclosure describes a driver circuit, a light-emitting display device, and a driving method. Even in the case that other video control driving, e.g., fake data insertion driving, is performed during sensing driving, the sensing is not influenced by the other video control driving, e.g., fake data insertion driving. Sensing errors are prevented, and image quality is improved.