Light Guide Plate Slopes Suppress Unwanted Pattern Display
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Solution Overview
Problem
Current display devices using light guide plates struggle to effectively display multiple patterns on a single area without increasing costs or size, as they require stacking multiple plates and suffer from unwanted pattern display due to light reflection and deformation issues.
Innovation Solution
A display device design featuring a light guide plate with first and second side surfaces facing each other, where light is incident from one side and reflected to the upper surface by specific reflection parts, and a slope is provided on at least one side surface to suppress unwanted pattern display and maintain uniform light intensity, even when the plate is deformed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light guide plates are stacked to display multiple patterns, then the display capability is improved, but the cost and apparatus size increase
Solution Approach 1:
The invention segments the light guide plate into multiple functional regions with different reflection part configurations. Each region can display different patterns independently, allowing multiple patterns to be displayed on a single light guide plate without stacking multiple plates, thus reducing apparatus size while maintaining display capability
Solution Approach 2:
The invention utilizes the thickness dimension of the light guide plate by forming reflection parts that protrude into the plate from the bottom surface. This three-dimensional utilization allows multiple patterns to be encoded in different depth zones within the same plate, enabling multi-pattern display without increasing the number of plates
2Adaptability or versatility
If reflection parts with gentle slopes are used to display multiple patterns, then the pattern switching capability is improved, but unwanted pattern display occurs due to light reflection
Solution Approach 1:
The invention applies different slope characteristics to different regions of the light guide plate. Each region has reflection parts with slopes specifically designed for its intended pattern, allowing precise control over which patterns are displayed from each side while minimizing unwanted pattern leakage through localized optimization of reflection properties
Solution Approach 2:
The invention employs asymmetric slope designs where the gentle slope and steep slope have different angles and orientations. This asymmetry creates directional selectivity in light reflection, ensuring that light incident from one side produces the intended pattern while light from the opposite side produces a different pattern, thereby suppressing unwanted pattern display
3Adaptability or versatility
If light is incident from side surfaces to display patterns, then the display flexibility is improved, but uniform light intensity is difficult to maintain due to plate deformation
Solution Approach 1:
The invention pre-compensates for potential plate deformation by designing the reflection parts with slopes that account for expected dimensional changes. The slope angles and positions are optimized in advance to maintain uniform light intensity even when the plate undergoes thermal expansion, mechanical stress, or installation-induced deformation, ensuring consistent display quality under varying 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
The solution allows for beautiful and uniform display of desired patterns by reducing unwanted pattern display and maintaining consistent light intensity, while minimizing the effects of plate deformation and light entrance position variations.
Implementation Method 1
light incident from all directions is reflected as outgoing light
Implementation Method 2
The incident light is reflected in the inside of the light guide plate efficiently and is emitted from a display area
Implementation Method 3
The light 67 is transmitted after being refracted on the steep slope 64 and the gentle slope 63, propagating inside the light guide plate 66 again
Data Source
AI summary
A display device includes a light guide plate, and light sources allowing light to be incident on a first side surface and a second side surface of the light guide plate. First incidental side surface light from the first light source is reflected to an upper surface side by first reflection parts formed on a bottom surface to display a first pattern, and second incidental side surface light from the second light source is reflected to the upper surface side by second reflection parts formed on the bottom surface to display a second pattern. Slopes are provided at parts of the first side surface and the second side surface of the light guide plate, and light reflected on a facing reflection surface and propagating in the light guide plate again is reduced by the slopes.