Display Device Overcurrent Protector for Burnt Pixel Detection
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Solution Overview
Problem
Existing display devices face challenges in quickly and accurately determining if pixels are burnt due to overcurrent issues, as current sensing through power voltage lines is slow and inaccurate due to the large number of connected pixels.
Innovation Solution
A display device with an overcurrent protector that includes a sensing controller and a burnt determiner, which senses currents in specific frame periods and determines if a pixel row is burnt by comparing sensed currents with threshold values, and provides a shutdown signal to the power supply when necessary, allowing for real-time and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If overcurrent is sensed through the power voltage line, then the sensing covers all pixels, but the sensing of the overcurrent is slow and inaccurate
Solution Approach 1:
The patent divides the display panel into multiple pixel rows and senses the current of each pixel row separately using a sensing controller. This segmentation allows for more precise identification of which specific pixel row is experiencing overcurrent, improving measurement precision while maintaining relatively fast sensing speeds by focusing on smaller subsets of pixels rather than sensing all pixels simultaneously through the power voltage line.
2Measurement precision
If current sensing is performed for each pixel row, then the burnt pixel determination becomes accurate, but the device complexity increases
Solution Approach 1:
The sensing controller performs multiple functions: it senses currents of individual pixel rows, determines whether pixels are burnt based on the sensed currents, and controls the shutdown of the power supply. By making the sensing controller multi-functional, the patent achieves accurate burnt pixel detection without significantly increasing device complexity, as the same controller handles sensing, determination, and control tasks.
Solution Approach 2:
The system implements a feedback mechanism where the sensing controller continuously monitors the current of each pixel row and compares it against threshold values to determine if pixels are burnt. This feedback loop enables accurate detection while keeping the control logic centralized in the sensing controller, avoiding the need for separate complex detection circuits for each pixel row.
3Reliability
If the power supply is shut down immediately when overcurrent is detected, then pixel damage is prevented, but false shutdowns may occur due to noise
Solution Approach 1:
The sensing controller first senses the current of a pixel row and determines whether it exceeds the threshold before initiating a shutdown. This preliminary determination step allows the system to verify that the overcurrent is genuine and not caused by noise, improving detection accuracy while still enabling timely protection. The controller can also sense adjacent pixel rows to confirm the overcurrent pattern before shutting down, further reducing false positives.
Data Source
AI summary
A display device may include a display panel including a plurality of pixel rows, a power supply providing a power voltage to the display panel, and an overcurrent protector shutting down the power supply when at least one of the pixel rows is burnt. The overcurrent protector may include a sensing controller sensing a first current of at least one first pixel row of the display panel in a first frame period, and sensing a second current of the first pixel row in a second frame period after the first frame period when the first current is greater than or equal to a first threshold value. The overcurrent protector may further include a burnt determiner determining whether the first pixel row is burnt, and providing a shutdown signal to the power supply when the first pixel row is burnt.