Display Current Limiting by Refresh Rate for Pixel Protection
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Solution Overview
Problem
Existing display devices face challenges in optimizing limit current values in response to varying driving frequencies, leading to potential damage or reduced display quality due to excessive driving currents, especially at high refresh rates.
Innovation Solution
A display device and method that adjusts limit current values based on image refresh rates, using a timing controller to compare global current values with predefined limits, and adjusts the first driving power voltage accordingly to prevent excessive current flow, thereby maintaining optimal display quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed limit current value is used regardless of driving frequency, then the device structure is simple, but display quality deteriorates and device damage risk increases at high refresh rates
Solution Approach 1:
The patent applies dynamics by making the limit current value variable rather than fixed. The timing controller dynamically adjusts the limit current value based on the detected driving frequency, selecting from multiple predefined values stored in memory. This allows the system to adapt to different operating conditions (refresh rates) and prevent excessive current flow at high frequencies while maintaining simplicity in implementation.
2Reliability
If the limit current value is lowered to prevent device damage at high refresh rates, then device reliability improves, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the limit current value based on the driving frequency parameter. The timing controller detects the refresh rate and selects an appropriate limit current value from multiple predefined options stored in memory. This allows the system to optimize the balance between device safety and power consumption for each operating condition, rather than using a conservative fixed value that would increase power consumption unnecessarily at lower refresh rates.
3Device complexity
If a fixed limit current value is used, then the control mechanism is simple, but excessive current flow occurs at high refresh rates causing potential damage
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control mechanism. The timing controller continuously detects the driving frequency (refresh rate), compares it with stored frequency values, and adjusts the limit current value accordingly. This feedback mechanism ensures that the appropriate current limit is applied for each operating condition, preventing excessive current flow and potential device damage while maintaining reasonable control complexity through the use of predefined current values.
Data Source
AI summary
A display device includes a display having pixels connected to a first power line, a second power line, scanning lines, and data lines; a current sensor to sense a global current value flowing to the pixels; a power generator to supply a first driving power to the first power line, and a second driving power to the second power line; and a timing controller to compare a limit current value corresponding to an upper limit value of a driving current flowing to the pixels with the global current value, and to control the power generator in response to a result of the comparison, and the limit current value is set differently based on image refresh rates of the display.