Display Device High-Temperature Operation Mode Circuit
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Solution Overview
Problem
Liquid crystal display devices, particularly those used in vehicles, face challenges in operating effectively at high temperatures above 100° C due to temperature rise issues with circuit components, especially control ICs and logic ICs, which struggle to maintain operation and reduce heat.
Innovation Solution
Incorporating a temperature detecting sensor and a display bit reduction circuit that activates a high-temperature operation mode by sending only the highest-order bit of display data, reducing power supply voltages, and adjusting signal periods to minimize heat generation and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates under high-temperature environment (above 100°C), then the display functionality is maintained, but the temperature rise of circuit components (control IC, logic IC) increases causing operation failure
Solution Approach 1:
The patent applies periodic action by reducing the frame rate from 60Hz to 30Hz under high-temperature conditions. This periodic reduction in operation frequency allows circuit components to cool down between display updates, preventing temperature accumulation while maintaining display functionality. The display control device detects high temperature and dynamically adjusts the refresh rate to manage thermal load.
Solution Approach 2:
The patent implements dynamics by making the display refresh rate adjustable based on temperature conditions. The system transitions from a fixed 60Hz refresh rate to a dynamic rate that can be reduced to 30Hz when high temperature is detected. This dynamic adaptation allows the display device to optimize performance and thermal management in real-time based on environmental conditions.
2Loss of energy
If the refresh rate is reduced to 30Hz under high temperature, then power consumption and heat generation are reduced, but display smoothness and responsiveness deteriorate
Solution Approach 1:
The system dynamically adjusts the refresh rate based on temperature detection. When high temperature is detected, the refresh rate is reduced from 60Hz to 30Hz to reduce power consumption and heat generation. When temperature returns to normal, the refresh rate is restored to 60Hz. This dynamic adjustment optimizes the balance between energy efficiency and display performance based on real-time thermal conditions.
Solution Approach 2:
The patent changes the operational parameter of refresh rate from a fixed value to a variable that adapts to temperature conditions. By modifying this parameter dynamically, the system achieves lower power consumption and reduced heat generation during high-temperature operation, while maintaining acceptable display functionality for temperature monitoring applications.
Data Source
AI summary
A display device includes a display panel having a plurality of pixels, a drive circuit inputting a drive voltage to the plurality of pixels, and a display control device controlling and driving the drive circuit and to which display data is input from an external apparatus, in which a temperature detecting sensor is included. The display control device has a display bit reduction circuit. In a high-temperature operation mode when a temperature equal to or more than a predetermined temperature is detected at the temperature detecting sensor, the display bit reduction circuit ignores bits other than the highest-order bit of the display data input from the external apparatus and sends only the data of the highest-order bit of the display data input from the external apparatus to the drive circuit.