Optical Sensor Mounting Structure for LCD Backlight Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal image display devices face challenges in accurately measuring backlight luminance due to deformation of the reflection sheet caused by heat or external forces, which affects the gap between the reflection sheet and the tubular cushion, leading to variations in light measurement by the optical sensor.
Innovation Solution
An optical sensor mounting structure where the front and back surfaces of the tubular cushion are bonded to predetermined positions, ensuring a constant distance and area for light measurement from the reflection sheet to the optical sensor, thereby eliminating gaps and stabilizing light measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reflection sheet is simply mounted on the edge of the panel metal sheet, then the device structure is simple and easy to manufacture, but the reflection sheet deforms due to heat or external forces, causing variations in light measurement
Solution Approach 1:
The patent applies a flexible reflection sheet that is bonded to both the panel metal sheet and the base metal sheet, creating a constrained flexible structure. This allows the reflection sheet to accommodate thermal expansion and deformation while maintaining consistent positioning relative to the optical sensor, thereby preserving measurement precision without compromising ease of manufacture
Solution Approach 2:
The patent combines the reflection sheet mounting structure with the overall device housing by integrating the base metal sheet that serves both as a structural component and as a mounting surface for the reflection sheet. This merging of functions reduces the number of separate components and assembly steps while ensuring stable positioning for accurate light measurement
2Adaptability or versatility
If the reflection sheet is made more flexible to accommodate deformation, then the device can better handle thermal expansion, but the deformation becomes more significant and affects light measurement accuracy
Solution Approach 1:
The patent uses a flexible reflection sheet bonded between two rigid metal sheets (panel metal sheet and base metal sheet), creating a constrained flexible structure that accommodates thermal expansion while maintaining stable positioning for accurate optical measurement
Solution Approach 2:
The patent creates a composite structure combining the flexible reflection sheet with rigid metal sheets, forming a layered composite that leverages the flexibility of the reflection sheet for thermal adaptation while using the rigidity of the metal sheets to maintain stable positioning and measurement accuracy
3Measurement precision
If the optical sensor is positioned closer to the reflection sheet to improve measurement accuracy, then light measurement precision increases, but the device becomes more sensitive to gaps caused by reflection sheet deformation
Solution Approach 1:
The patent bonds the reflection sheet to both the panel metal sheet and base metal sheet, creating a constrained flexible structure that maintains consistent positioning despite thermal expansion, allowing the optical sensor to be positioned close to the reflection sheet for high measurement precision while ensuring reliable consistent measurements
Solution Approach 2:
The patent provides beforehand cushioning by bonding the reflection sheet to rigid metal sheets that prevent excessive deformation, ensuring that the gap between the reflection sheet and optical sensor remains within acceptable limits under various thermal conditions, thus maintaining both precision and reliability
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 solution allows for accurate measurement of backlight light, improving the quality of image display devices by maintaining consistent light measurement despite deformation of the reflection sheet, and can be implemented without significant design changes.
Implementation Method 1
an optical sensor configured to measure light from a back surface of a reflection sheet
Implementation Method 2
a tubular cushion for preventing entry of external light into the optical sensor
Implementation Method 3
a reflection sheet disposed on the back surface of a backlight lamp and configured to reflect light emitted from the backlight lamp forward
Data Source
AI summary
Provided is an optical sensor mounting structure which is used in an image display device and in which the gap between a reflection sheet and a tubular cushion for preventing the entry of external light into an optical sensor is eliminated so that the amount of light from a backlight can be measured accurately. A liquid crystal image display device includes an optical sensor that measures light from the back surface of a reflection sheet, a substrate having the optical sensor thereon, and a tubular cushion for preventing the entry of external light into the optical sensor. The front surface of the tubular cushion is bonded to the reflection sheet, and the back surface thereof is bonded to the substrate.