Display Panel Power Control for Line-Load Overcurrent Prevention
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Solution Overview
Problem
Display devices experience damage due to overcurrents when luminance adjustments are not synchronized with input image data, leading to potential damage of the data driver and display panel.
Innovation Solution
A display device with a power voltage generator and driving controller that adjusts power voltage levels and scale factors based on load reference values and line loads to prevent or reduce overcurrents by generating control signals to manage power current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If luminance adjustment is delayed by one frame, then processing accuracy is improved, but overcurrent damage occurs to the display panel and data driver
Solution Approach 1:
The system performs preliminary detection of line load values before the actual luminance adjustment is applied. By detecting whether the current line load exceeds the reference value in advance, the system can proactively adjust the power voltage or scale factor to prevent overcurrent conditions, rather than waiting for the delayed frame-based adjustment to take effect.
Solution Approach 2:
The system implements a feedback mechanism where the detected line load value is continuously compared with the reference value, and the power voltage generator adjusts the power voltage based on this comparison. This closed-loop feedback allows real-time correction of overcurrent conditions, ensuring the display panel operates within safe current limits while maintaining accurate luminance adjustment.
2Device complexity
If frame-based luminance adjustment is used, then processing simplicity is improved, but response speed deteriorates due to one-frame delay
Solution Approach 1:
The system segments the luminance control into two independent components: frame-based scale factor adjustment and line-based power voltage adjustment. This segmentation allows the power voltage to be adjusted on a per-line basis with immediate effect, eliminating the one-frame delay inherent in frame-based adjustments, while the scale factor provides the higher-level frame-synchronized control.
Solution Approach 2:
The system introduces dynamic, real-time adjustment capability through line load detection and immediate power voltage modification. This dynamic response complements the static, pre-planned frame-based scale factor adjustment, creating a multi-layered control system that operates at different time scales to achieve both simplicity and speed.
3Use of energy by moving object
If power voltage is not adjusted in real-time, then energy consumption is reduced, but overcurrent damage risk increases
Solution Approach 1:
The system dynamically changes the power voltage parameter based on real-time line load detection. When the line load value exceeds the reference value, the power voltage is reduced to prevent overcurrent; when the load is within acceptable limits, the power voltage is maintained at its normal level. This conditional parameter adjustment prevents unnecessary energy consumption while eliminating overcurrent damage risk.
Data Source
AI summary
A display device includes a display panel, a power voltage generator, and a driving controller. The display panel displays a plurality of frame images based on input image data. The power voltage generator provides a power voltage to the display panel. The driving controller generates a load reference value based on a voltage level of the power voltage and a scale factor for adjusting grayscales of the plurality of frame images, generates at least one of a first signal or a second signal for controlling a power current by comparing the load reference value with a plurality of line loads associated with a plurality of line images, and performs at least one of a first operation for reducing the scale factor based on the first signal or a second operation for reducing the voltage level of the power voltage based on the second signal.