Display Data Driver Overheat Prevention via Toggle Detection
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Solution Overview
Problem
Display devices face overheating issues in data drivers due to increased frequency of data signal changes as the number of pixels controlled by one data line increases, leading to potential damage and reduced manufacturing efficiency.
Innovation Solution
A display device with a detector to calculate the number of gray value changes in successive pixels, a comparator to compare this with a reference number of toggles, and a lookup table selector to choose between different lookup tables or driving voltages to manage the data driver's workload, thereby reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of pixels controlled by one data line is increased, then the manufacturing cost is reduced and productivity is improved, but the frequency of data signal changes increases causing the data driver to overheat and be damaged
Solution Approach 1:
The patent applies dynamics by making the data driver's operating voltage adjustable based on operating conditions. The voltage is dynamically changed between a first voltage level and a second voltage level depending on the number of pixels controlled by each data line, allowing the system to adapt to varying loads and prevent overheating while maintaining high productivity
Solution Approach 2:
The patent changes the voltage parameter of the data driver based on the number of pixels controlled by each data line. When more pixels are controlled by one data line, the voltage is adjusted to a second level that reduces signal change frequency, thereby preventing overheating while maintaining the ability to control a large number of pixels
2Ease of manufacture
If the number of data lines is minimized to reduce manufacturing cost, then the number of data driving chips is reduced, but the frequency of data signal changes increases sharply
Solution Approach 1:
The patent changes the voltage parameter of the data driver based on the number of pixels controlled by each data line. When more pixels are controlled by one data line, the voltage is adjusted to a second level that reduces signal change frequency, thereby preventing overheating while maintaining the ability to control a large number of pixels
Solution Approach 2:
The patent applies dynamics by making the data driver's operating voltage adjustable based on operating conditions. The voltage is dynamically changed between a first voltage level and a second voltage level depending on the number of pixels controlled by each data line, allowing the system to adapt to varying loads and prevent overheating while maintaining high productivity
Data Source
AI summary
A display device and method is provided that permits selection of a first lookup table or a second lookup table to operate the data driver at respectively different temperatures to prevent heat from damaging the display device. The display device includes a detector which detects the number of toggles in which the amount of change in gray values of successive pixels driven by the same data line in one frame is equal to or greater than a reference gray change amount. A comparator compares the number of toggles detected by the detector with a reference number of toggles, and a lookup table selector which selects any one of a first lookup table and a second lookup table based on the comparison result of the comparator and provides the selected first lookup table or second lookup table to a data driver.