Display Panel Current Sensing for Overcurrent-Safe Luminance Control
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Solution Overview
Problem
Existing display devices face damage due to overcurrents when the luminance of the display panel is not adjusted based on the load of input image data, leading to potential damage to the data driver and display panel.
Innovation Solution
A display device that senses the power current of the display panel, adjusts the analog-to-digital conversion time based on peak white luminance, and sets a current limit based on full white luminance to prevent overcurrents and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the analog-to-digital conversion time is increased to reduce noise and improve conversion accuracy, then the measurement precision is improved, but the response speed for over current detection becomes slow, causing increased power consumption
Solution Approach 1:
The patent applies dynamics by making the analog-to-digital conversion time variable rather than fixed. The conversion time is dynamically adjusted based on the peak white luminance of the display panel: when peak white luminance is high, the conversion time is set to a first (longer) value to ensure accuracy; when peak white luminance is low, the conversion time is set to a second (shorter) value to improve response speed. This dynamic adjustment resolves the contradiction between measurement precision and response speed.
2Device complexity
If the luminance of the display panel is not adjusted based on the load of input image data, then the device complexity is reduced, but over current flows through the data driver and display panel, causing damage
Solution Approach 1:
The patent implements feedback control by sensing the power current of the display panel and using this information to adjust the luminance. The timing controller determines the peak white luminance based on the sensed power current and adjusts the luminance accordingly to prevent over current damage. This feedback mechanism ensures reliability while maintaining relatively simple device complexity.
3Use of energy by moving object
If the power voltage is decreased to limit over current, then the power consumption is reduced, but the luminance output of the display panel is reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the power voltage based on the sensed power current and determined peak white luminance. When over current is detected, the power voltage is decreased to limit the current and reduce power consumption. The timing controller dynamically changes the power voltage parameter to balance power consumption and luminance output requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively adjusts the analog-to-digital conversion time and current limit to prevent overcurrents, minimizing power consumption and improving the accuracy of analog-to-digital conversion, thereby protecting the display device from damage.
Implementation Method 1
a power current sensor configured to sense the power current of the display panel and to generate a power current code by performing analog-to-digital conversion on the sensed power current
Data Source
AI summary
A display device includes a display panel including pixels, a power voltage generator which provides a power voltage to the display panel, a power current sensor which senses a power current of the display panel and generates a power current code by performing analog-to-digital conversion on the sensed power current, and a timing controller which determines an analog-to-digital conversion time of the power current based on a peak white luminance.