Display Pixel Compensation Using Sensing Voltage Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with defective pixels, such as OLEDs, result in decreased display quality and reduced product yield due to non-emitting light-emitting devices, which existing technologies struggle to effectively address.
Innovation Solution
A display module with a processor that determines the location of defective sub-pixels and controls the source driving circuit to output a second data signal, ensuring the brightness of defective sub-pixels matches non-defective ones, utilizing sensing voltage signals and gate driving circuits to adjust pixel circuit operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional display manufacturing is used, then production efficiency is maintained, but defective pixels reduce product yield and display quality
Solution Approach 1:
The patent applies preliminary action by detecting defective pixels during the manufacturing process and applying compensation before the display module is finalized. The processor identifies sub-pixels with abnormal sensing voltage signals and pre-adjusts their data signals to compensate for potential light emission issues, thereby improving product yield without requiring post-manufacturing repair.
Solution Approach 2:
The patent implements feedback through the sensing voltage signal line and sampling sensing circuit that continuously monitor the electrical state of each sub-pixel. The processor uses this feedback information to dynamically adjust data signals for sub-pixels showing abnormal characteristics, ensuring display quality while maintaining high product yield through real-time compensation.
2Manufacturing precision
If defective sub-pixels are repaired using conventional methods, then some display uniformity is achieved, but complexity increases and not all defective pixels can be effectively addressed
Solution Approach 1:
The patent applies self-service by enabling the display module to automatically detect and compensate for its own defective pixels without external intervention. The built-in sensing circuit and processor work together to identify sub-pixels with abnormal characteristics and automatically adjust their driving signals, achieving high display uniformity while keeping the system relatively simple compared to external repair mechanisms.
Solution Approach 2:
The patent uses parameter changes by modifying the voltage level of data signals sent to defective sub-pixels. When a sub-pixel is identified as defective through abnormal sensing voltage signals, the processor adjusts the data signal parameters (voltage levels) to compensate for the defect, thereby achieving display uniformity through electrical parameter adjustment rather than physical modification.
3Reliability
If multiple light-emitting sub-units are used per sub-pixel, then reliability against defects is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing each sub-pixel into multiple light-emitting sub-units, where each sub-unit has its own pixel circuit. This segmentation allows individual defective sub-units to be compensated independently while others continue to function, improving reliability against pixel defects. The sensing voltage signal line connects to each sub-unit's pixel circuit, enabling targeted compensation without affecting the entire sub-pixel or requiring complex manufacturing changes.
Data Source
AI summary
A display module includes sub-pixels, data lines, a source driving circuit and a processor. Each sub-pixel includes light-emitting sub-units each including a pixel circuit and at least one light-emitting device. A data line is electrically connected to a sub-pixel. The source driving circuit is electrically connected to the data line. The source driving circuit is configured to output a first or second data signal to the sub-pixel through the data line. The processor is configured to: determine location information of a target sub-pixel; and control, according to the location information, the source driving circuit to output the second data signal to the target sub-pixel, so that a brightness of the target sub-pixel is substantially the same as that of a non-target sub-pixel.