Display Voltage Control for Thermal Stability
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Solution Overview
Problem
Organic electroluminescence (EL) displays face issues with heat generation and display quality deterioration due to the increase in power consumption and dramatic changes in driving voltage, which affect light emission luminance.
Innovation Solution
A display apparatus with light emitting elements driven by current, equipped with a voltage control unit that adjusts the driving voltage based on the temperature of the display apparatus, ensuring that the rate of change in the driving voltage does not exceed a predetermined limited range, and is correlated with the change in light emission luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving voltage is changed dramatically to increase the amount of current flowing across the light emitting elements, then the light emission luminance increases, but the display quality deteriorates and heat generation increases
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable and adaptive rather than fixed. The voltage control unit dynamically adjusts the driving voltage based on temperature feedback from the display apparatus, allowing the system to adapt to changing thermal conditions while maintaining stable light emission luminance and preventing display quality deterioration
Solution Approach 2:
The patent changes the parameter of driving voltage from a fixed or dramatically variable value to a controlled value within a limited range. By constraining the driving voltage to change only within a predetermined limited range based on temperature, the system achieves stable light emission luminance while preventing the harmful effects of dramatic voltage changes
2Illumination intensity
If the driving voltage is changed dramatically to increase the amount of current flowing across the light emitting elements, then the light emission luminance increases, but heat generation increases
Solution Approach 1:
The patent implements feedback control by using a temperature detection unit to monitor the temperature of the display apparatus and feeding this information back to the voltage control unit. The voltage control unit then adjusts the driving voltage based on the detected temperature, ensuring that voltage changes remain within a limited range and preventing excessive heat generation while maintaining stable light emission luminance
Solution Approach 2:
The system dynamically adjusts the driving voltage based on real-time temperature conditions. By making the voltage control adaptive rather than static, the system can respond to thermal changes and maintain stable operation within a limited voltage range, preventing both display quality deterioration and excessive heat generation
Data Source
AI summary
A display apparatus includes light emitting elements that are driven by current and a voltage control unit that controls a driving voltage for driving the light emitting elements based on a temperature of the display apparatus. The voltage control unit performs control such that an amount of change in the driving voltage per unit time does not exceed a predetermined limited range. The predetermined limited range is determined based on a relationship between the change in the driving voltage and a change in a light emission luminance of the light emitting elements.