Display Power Voltage Control for Overcurrent Prevention
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Solution Overview
Problem
In display devices, if the luminance of a display panel is not adjusted based on the load of input image data, it can lead to overcurrent flow, potentially damaging the data driver or the display panel due to delays in determining the load of input image data.
Innovation Solution
A display device that senses the power current applied to the display panel and controls the power voltage based on the current level, using a driving controller to generate a voltage control signal for adjusting the power voltage in subsequent frames, thereby preventing overcurrent flow by determining a scale factor for grayscale adjustment based on the load and maximum grayscale value of the input image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If luminance adjustment is delayed by M frames to determine load of input image data, then processing complexity is reduced, but overcurrent flows damaging the display panel or data driver
Solution Approach 1:
The patent applies preliminary action by calculating the load of input image data M frames in advance before the actual display frame. This allows the system to determine the luminance adjustment requirements beforehand, generate appropriate voltage control signals, and adjust power voltage levels proactively, preventing overcurrent conditions before they occur during the actual display operation.
Solution Approach 2:
The patent implements feedback by continuously monitoring the load of input image data through grayscale value calculations, comparing it against reference values, and using this information to dynamically adjust power voltage levels. The system feeds back the load information from M frames ago to control the current frame's power voltage, creating a closed-loop control system that prevents overcurrent while optimizing power consumption.
2Reliability
If luminance adjustment is performed immediately without delay, then display panel safety is improved, but processing time increases
Solution Approach 1:
The patent performs the computationally intensive load calculation and luminance adjustment determination in advance during M frames before the actual display is needed. This preliminary processing allows the system to have the adjustment parameters ready when the actual display frame arrives, minimizing the critical processing time during the display operation itself while maintaining safety.
Solution Approach 2:
The patent implements dynamic frame timing where the luminance adjustment is applied to the (N+M)-th frame based on load calculations from the N-th frame. This dynamic timing strategy allows the system to balance processing requirements with display requirements, ensuring safety without creating unnecessary delays in the actual display output.
3Device complexity
If power voltage is not adjusted based on image data load, then device operation is simpler, but power consumption increases and overcurrent occurs
Solution Approach 1:
The patent applies dynamic power voltage adjustment where the power voltage level is continuously adapted based on the calculated load of input image data. The system dynamically selects from multiple power voltage levels (first power voltage, second power voltage, third power voltage) depending on whether the load exceeds reference values, optimizing power consumption in real-time while maintaining relatively simple control logic through predefined voltage levels.
Solution Approach 2:
The patent changes the power voltage parameter based on the load characteristics of input image data. By calculating the sum of grayscale values and comparing against reference values, the system adjusts the power voltage parameter to appropriate levels, reducing power consumption during low-load conditions while ensuring adequate performance during high-load conditions, all through manageable parameter adjustments.
Data Source
AI summary
A display device includes a display panel which displays an image based on input image data, a driving controller which generates a voltage control signal for adjusting a first power voltage applied to the display panel in an (N+M)-th frame based on a maximum grayscale value of the input image data of an N-th frame, where N is a positive integer, and M is a positive integer, and a power voltage generator which senses a power current applied to the display panel in the (N+M)-th frame, generates a second power voltage based on the voltage control signal, and controls a voltage level of the first power voltage based on the second power voltage and a current level of the power current.