Outdoor Display Polarizer Cooling With Indirect Temperature Sensing
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Solution Overview
Problem
Commercial outdoor display devices face challenges in accurately detecting and dissipating excessive temperature of the polarizer due to sunlight exposure, leading to deformation and abnormality, especially with thinner designs that make it difficult to integrate temperature sensors directly.
Innovation Solution
A display device with a first temperature sensor on the cover glass adjacent to the polarizer and a second temperature sensor in the air flow channel, along with a thermal dissipation mechanism that adjusts backlight brightness and fan rotation speed based on temperature measurements to maintain optimal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is directly integrated in the polarizer area, then temperature detection accuracy is improved, but device complexity increases and manufacturing becomes difficult due to thinner display device design
Solution Approach 1:
The patent uses the cover glass as an intermediary medium to indirectly detect polarizer temperature. Instead of placing a sensor directly on the polarizer, a temperature sensor is mounted on the cover glass surface, which thermally couples with the polarizer region. This intermediary approach enables temperature measurement without direct sensor-polarizer contact, resolving the contradiction between measurement accuracy and integration complexity.
Solution Approach 2:
The patent transitions from direct spatial contact (sensor on polarizer) to indirect thermal coupling through the cover glass surface. By moving the sensor placement to the cover glass dimension, the system achieves temperature detection capability without compromising the thin profile or increasing internal complexity.
2Illumination intensity
If the brightness of the backlight module is increased to improve display visibility, then illumination intensity is improved, but temperature of the polarizer increases causing deformation and abnormality
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor polarizer temperature, and the control unit dynamically adjusts backlight brightness based on temperature readings. When temperature exceeds a threshold, brightness is reduced to prevent overheating; when temperature is acceptable, brightness can be increased for better visibility. This feedback mechanism resolves the contradiction by enabling adaptive brightness control.
Solution Approach 2:
The system transitions from static brightness settings to dynamic brightness adjustment based on real-time temperature conditions. The backlight module's illumination intensity becomes a variable parameter that adapts to thermal conditions, allowing optimal balance between visibility and temperature management.
3Temperature
If thermal dissipation mechanisms are activated to reduce polarizer temperature, then temperature control is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic or conditional activation of thermal dissipation mechanisms rather than continuous operation. Temperature sensors monitor polarizer temperature, and cooling mechanisms (such as fans or heat sinks) are activated only when temperature thresholds are exceeded. This periodic action reduces energy consumption while maintaining effective temperature control.
Solution Approach 2:
The system changes operational parameters dynamically - adjusting backlight brightness and thermal dissipation activation based on temperature measurements. By modifying these parameters conditionally rather than maintaining fixed high-performance settings, the system achieves effective temperature control with reduced energy consumption during normal operating conditions.
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
Accurately activates thermal dissipation mechanisms to prevent polarizer deformation and maintain normal operation under high outdoor temperatures by dynamically adjusting backlight brightness and fan speed, ensuring efficient temperature management.
Implementation Method 1
The first temperature sensor is disposed on a first surface of the cover glass adjacent to the polarizer and is located in the edge area of the cover glass
Implementation Method 2
The second temperature sensor is disposed in the air flow channel
Implementation Method 3
an air flow channel located between the case and the backlight module
Implementation Method 4
The polarizer is located between the cover glass and the display module
Data Source
AI summary
A display device includes a case, a display module, a polarizer, a backlight module, an air flow channel, a cover glass, a first temperature sensor, and a second temperature sensor. The display module is disposed in the case, and the display module has a first side and a second side. The cover glass is located on the first side of the display module and is disposed on the case, wherein the cover glass has a display area and an edge area surrounding the display area. The polarizer is located between the cover glass and the display module. The backlight module is located on a second side of the display module and is disposed in the case. The first temperature sensor is disposed on the first surface of the cover glass adjacent to the polarizer. The second temperature sensor is disposed in the air flow channel.