LCD Optical Module Layout for Uniform Sensing-Area Luminance
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Solution Overview
Problem
Luminance variations between the active area and sensing area of a liquid crystal panel in display apparatuses degrade image quality due to the absence of light emission in the sensing area.
Innovation Solution
The display apparatus is designed with a back-light unit comprising a first light guide plate and a first light source device, where a liquid crystal panel is disposed on the upper surface, and an optical module with a second light guide plate, second light source device, and optical device are positioned on the lower surface, with the second light source device and optical device disposed outside the sensing area, and a module reflecting plate and sheet with adhesive, heat insulating, and filter layers to manage light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing area is disposed in the active area of the liquid crystal panel, then the optical module can detect external light through the sensing area, but luminance variations occur between the active area and sensing area degrading image quality
Solution Approach 1:
The patent applies local quality by providing differentiated light supply to different regions of the liquid crystal panel. The sensing area receives light from both the first light source device (through the first light guide plate) and the second light source device (through the second light guide plate), while other areas receive light only from the first light source device. This localized enhancement of light supply to the sensing area ensures uniform luminance across the entire panel while maintaining external light detection capability.
2Measurement precision
If the sensing area does not emit light for realizing an image, then the optical module can detect external light, but quality of the image provided to the user deteriorates due to luminance variations
Solution Approach 1:
The patent implements local quality by creating a specialized lighting configuration for the sensing area. The second light guide plate is positioned to illuminate specifically the sensing area, while the first light guide plate illuminates the entire panel including the sensing area. This dual light source arrangement ensures that the sensing area has sufficient luminance for both image display and external light detection, eliminating luminance variations that would degrade image quality.
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 configuration ensures uniform luminance between the active and sensing areas, maintaining image quality by supplying equal light levels to both regions and enhancing external light detection characteristics without distortion.
Implementation Method 1
a first light guide plate and a first light source device... supplying equal light levels to both regions
Implementation Method 2
a second light guide plate, second light source device... supplying equal light levels to both regions
Implementation Method 3
a module reflecting plate and sheet with adhesive, heat insulating, and filter layers
Implementation Method 4
module sheet with adhesive, heat insulating, and filter layers to manage light distribution
Implementation Method 5
module sheet with adhesive, heat insulating, and filter layers
Data Source
AI summary
A display device includes a liquid crystal panel and an optical module. A first light guide plate of a back-light unit may be disposed between the optical module and the liquid crystal panel. The liquid crystal panel may include a sensing area for detecting external light. The optical module may include a second light guide plate overlapping with the sensing area of the liquid crystal panel, and an optical device disposed on a path of external light passing through the first light guide plate and the second light guide plate. The optical module may include a light source device disposed on at least one of sides that are perpendicular to an upper surface of the second light guide plate toward the first light guide plate. Thus, in the display apparatus, the external light may be detected by the optical device, without deteriorating quality of an image provided to a user.