HUD Display Panel Temperature Sensor Placement
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Solution Overview
Problem
Conventional head-up displays face issues with temperature detection accuracy due to heat dissipation differences between the display area and the peripheral area, leading to incorrect execution of fail-safe functions when sunlight reflects onto the display panel.
Innovation Solution
A display device configuration with a heat sink, a light-transmitting member, and a temperature sensor positioned such that the sensor does not overlap with the heat sink or light-transmitting member, allowing for accurate temperature estimation at the display area by suppressing heat dissipation differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a temperature sensor is placed in the peripheral area of the display panel to detect temperature for fail-safe function, then temperature detection capability is improved, but measurement precision deteriorates due to heat dissipation differences between peripheral area and display area
Solution Approach 1:
A light-transmitting member is introduced as an intermediary between the display panel and heat sink. This member allows heat to be conducted from the display area to the heat sink while preventing direct thermal coupling between the peripheral area (where the temperature sensor is located) and the heat sink, thereby enabling accurate temperature detection at the display area without interference from heat sink cooling effects
Solution Approach 2:
The heat dissipation path is segmented by positioning the temperature sensor in the peripheral area outside the display area, and using the light-transmitting member to create a distinct thermal zone. The display area is thermally coupled to the heat sink through the light-transmitting member, while the peripheral area remains thermally isolated, allowing independent temperature measurement
2Temperature
If sunlight enters through the windshield and is focused on the display area, then the display panel heats up which improves visibility, but the display panel temperature increases causing risk of damage
Solution Approach 1:
The harmful concentrated sunlight energy is extracted and redirected away from the display panel by the mirror system. The mirror reflects focused sunlight away from the display area, preventing excessive heat accumulation that could damage the display panel while allowing the display to function normally
Solution Approach 2:
The light-transmitting member is designed to conduct heat away from the display area to the heat sink, converting the harmful heat accumulation into a beneficial heat dissipation mechanism. This allows the display panel to operate at safe temperatures even when exposed to concentrated sunlight
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
This configuration ensures accurate temperature estimation at the display area, enabling correct execution of fail-safe functions and preventing overheating issues.
Implementation Method 1
by bringing the back surface of the display panel into contact with a heat sink through a light-transmitting member made of glass, the heat generated by the display panel due to sunlight is conducted to a heat sink through the light-transmitting member and heat is dissipated
Implementation Method 2
a temperature sensor disposed in the peripheral area of the display panel to detect a temperature of the display panel
Implementation Method 3
by light from the backlight entering the back surface of the display panel and exiting from the display area on the front surface of the display panel, and the light from the display area being reflected by a mirror and projected onto the vehicle's windshield
Data Source
AI summary
A display device includes: a display panel that includes a display area that displays an image on a front surface and a peripheral area located outside the display area, and that projects light incident on a back surface from the display area as display light that represents the image; a heat sink disposed to face the back surface of the display panel; a light-transmitting member held between the display panel and the heat sink; and a temperature sensor disposed in the peripheral area of the display panel to detect a temperature of the display panel. When viewed in a direction perpendicular to the front surface of the display panel, the temperature sensor does not overlap with at least one of the heat sink or the light-transmitting member.