Light Receiving Hole Design for Accurate Brightness Measurement
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Solution Overview
Problem
Liquid crystal display (LCD) devices face inaccuracies in brightness measurement due to changes in the positional relationship between the light receiving hole and photosensor, often caused by deformation from heat, leading to inconsistent light measurement.
Innovation Solution
A display device design featuring a light receiving hole with a first end that is smaller than the light guide plate's thickness and a second end that overlaps the photosensor, along with a light adjusting member, ensures accurate light measurement by maintaining the quantity of light incident on the photosensor despite positional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light receiving hole design is used, then the structure is simple, but the measurement precision deteriorates due to positional changes between the light receiving hole and photosensor
Solution Approach 1:
The light receiving hole is divided into two distinct ends: a first end with a first size and a second end with a second size. This segmentation allows each end to serve different functions - the first end receives light from the light guide plate while the second end aligns with the photosensor, thereby maintaining measurement precision despite thermal deformation.
Solution Approach 2:
Different portions of the light receiving hole are given different properties. The first end has a smaller opening area optimized for receiving light from the light guide plate, while the second end has a larger opening area optimized for coupling with the photosensor. This local differentiation ensures accurate light measurement while accommodating component misalignment.
2Quantity of substance
If the light receiving hole size is increased to capture more light, then the light quantity increases, but the measurement precision deteriorates due to including unwanted light paths
Solution Approach 1:
The light receiving hole is segmented into a first end closer to the light guide plate and a second end closer to the photosensor. The first end has a controlled size to receive light from the light guide plate, while the second end is positioned to align with the photosensor, ensuring that the light quantity is sufficient without including unwanted light paths.
Solution Approach 2:
The light receiving hole acts as an intermediary structure between the light guide plate and the photosensor. By designing it with different sizes at its two ends, it mediates the light transmission while maintaining measurement precision - the first end captures light from the guide plate and the second end delivers it accurately to the photosensor.
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
The design maintains consistent light measurement accuracy even with changes in the positional relationship between components, enhancing the reliability of brightness measurement and display quality.
Implementation Method 1
a photosensor coupled to the receiving container, the photosensor sensing the light
Implementation Method 2
a light guide plate guiding the light and supplying the light to the display panel
Data Source
AI summary
A display device includes a display panel displaying an image, a light source generating light, a light guide plate guiding the light and supplying the light to the display panel, a receiving container receiving the light source and the light guide plate, the receiving container including a sidewall portion adjacent to the light guide plate and a bottom portion extending from the sidewall portion, a photosensor coupled to the receiving container, the photosensor sensing the light, and a light receiving hole formed in the receiving container, the light receiving hole comprising a first end and a second end, the first end being closer to the light guide plate and the second end being closer to the photosensor, wherein a height of the first end is smaller than a thickness of the light guide plate, and the second end overlaps the photosensor.