Optical Path Adjustment Member for Display Light Control
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Solution Overview
Problem
In photo luminescent display devices, light controlled by a liquid crystal layer often fails to reach the intended color conversion layer, leading to deteriorated display quality due to incorrect light incidence, causing partial sections to be underlit.
Innovation Solution
The implementation of an optical path adjustment member with a light guide member, protruding portions, and a light blocking layer ensures that light is directed to the correct area of the color conversion layer, using a reverse prism sheet to collect and transmit light within a predetermined angle range, preventing light from being incident on the wrong areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light is provided from a light source through a light guide member to a color conversion layer in a photo luminescent display device, then the display device can achieve simpler structure and lower cost by replacing conventional color filters, but light may be incident on incorrect areas of the color conversion layer causing deteriorated display quality
Solution Approach 1:
A light blocking layer is introduced as an intermediary element between the light guide member and the color conversion layer. This layer selectively blocks light in specific regions to prevent light from reaching incorrect areas of the color conversion layer, thereby resolving the light incidence accuracy problem while maintaining the simplified structure of the photo luminescent display device
Solution Approach 2:
The light blocking layer is applied selectively to specific regions (second side surface) of the light guide member rather than uniformly across the entire surface. This local application allows light to pass through in areas where it is needed while blocking it in areas where it would cause display quality deterioration, thus achieving precise light control without adding excessive complexity
2Manufacturing precision
If a light blocking layer is applied to the light guide member to control light incidence, then display quality is improved by preventing light from reaching incorrect areas, but the device structure becomes more complex
Solution Approach 1:
Instead of applying the light blocking layer to the entire light guide member surface, the invention applies it only to the second side surface where light blocking is needed. This partial application achieves the necessary light control function while minimizing the added structural complexity and material usage
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 enhances display quality by ensuring light is accurately directed to the intended color conversion areas, improving brightness characteristics and reducing light loss, thereby enhancing the overall performance of the display device.
Implementation Method 1
a light guide member including a light emission surface, a reflection surface
Implementation Method 2
a reverse prism sheet to collect and transmit light within a predetermined angle range
Implementation Method 3
a light blocking layer disposed on the plurality of protruding portions
Implementation Method 4
a photo luminescent display device displays an image using visible light generated when light having a low wavelength band is provided to a color conversion layer
Data Source
AI summary
A display device includes a display panel and a backlight unit which is disposed below the display panel, provides light to the display panel, and includes a light guide member including a light emission surface, a reflection surface, and a plurality of side surfaces which connect the light emission surface to the reflection surface, where the plurality of side surfaces includes a first side surface which receives light and a second side surface facing the first side surface in a first direction, a light source which provides the light to the first side surface, an optical path adjustment member disposed on the light guide member and including a flat portion, a plurality of protruding portions protruding from the flat portion in a direction of the light guide member, and a light blocking layer disposed on the plurality of protruding portions, and a prism sheet disposed on the flat portion.