Display Pixel Compensation Using Dummy-Pixel Sensing Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience deterioration of light emitting elements and transistors over time, affecting the intended appearance of pixels.
Innovation Solution
A display device incorporates a dummy pixel in an inactive area to sense characteristic changes, using a driving controller to generate compensation signals that adjust input signals based on sensing signals from the dummy pixel, thereby compensating for changes in transistors and light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If light emitting elements and transistors are operated for extended periods, then the display device can provide continuous image display functionality, but the characteristics of the pixels deteriorate and change
Solution Approach 1:
The patent applies preliminary action by using a dummy pixel to sense characteristic changes before they significantly affect the main pixels. The dummy pixel undergoes the same deterioration process in advance, allowing the system to predict and compensate for changes in the main pixels before they occur, thereby maintaining display quality over extended operating periods
Solution Approach 2:
The patent implements feedback by continuously monitoring the sensing signal from the dummy pixel and using this information to adjust the data signals sent to the main pixels. The driving controller modifies compensation values based on the sensed characteristic changes, creating a closed-loop system that maintains pixel performance despite extended operation and deterioration
2Reliability
If compensation mechanisms are added to account for pixel deterioration, then image quality consistency is improved, but the device complexity increases
Solution Approach 1:
The patent uses copying by creating a dummy pixel that replicates the structure and characteristics of the main pixels. This dummy copy serves as a sensor for detecting deterioration, allowing the system to monitor changes without directly affecting the main display pixels. The dummy pixel is a simplified version that performs only the sensing function
Solution Approach 2:
The patent introduces an intermediary element - the dummy pixel - that mediates between the main pixels and the driving controller. The dummy pixel translates physical deterioration into electrical sensing signals that the driving controller can process, enabling compensation without direct interaction between the main pixels and the control system
Data Source
AI summary
A display device may compensate for such changes in characteristics of light emitting elements and transistors in pixels of a display. For example, a driving circuit of a display device may update a lookup table that stores one or more compensation values. Each compensation value may correspond to a characteristic change of a pixel. In some embodiments, the characteristic change of a transistor may be determined based on a sensing signal received from a dummy pixel. Accordingly, a display device may generate a compensation signal based on an actual characteristic change of the transistor in the pixel. The compensation signal may be used by the display device to compensate for pixel characteristic changes that occur over time. For instance, a display device may use such compensation signals to correct input signals (e.g., to generate a corrected output signal) to be applied to one or more pixels of a display.