Lighting Device Light Blocking Member Brightness Uniformity
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Solution Overview
Problem
Existing lighting devices in liquid crystal display devices often exhibit uneven brightness due to localized increases in light emission, leading to recognizable bright spots, especially in smaller frame designs.
Innovation Solution
A lighting device configuration that includes a light source, a light guide plate, an optical sheet, and a light blocking member, where the light blocking member is positioned in the outer edge area to block excess light rays, reducing unevenness and bright spots by extending along the peripheral surface where the light entering and opposite surfaces are arranged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light source components are arranged at the periphery of the light guide member, then the lighting device can illuminate the display panel, but uneven brightness and bright spots occur due to localized increase in light emission
Solution Approach 1:
The patent applies local quality by positioning light blocking members at specific locations (outer edge areas) of the light guide plate where excess light occurs. This selectively blocks light only in areas where bright spots form, rather than uniformly reducing light across the entire display area, thus maintaining overall brightness while eliminating local unevenness
Solution Approach 2:
The light blocking member acts as an intermediary element between the light guide plate and the display panel. It intercepts and blocks excess light rays before they reach the display panel, preventing the formation of bright spots without affecting the primary light transmission path
2Area of stationary object
If the frame size is decreased, then the display device becomes more compact, but uneven brightness becomes more recognizable
Solution Approach 1:
By placing light blocking members specifically at outer edge areas of the light guide plate, the patent addresses brightness uniformity issues locally without requiring changes to the overall frame size. This allows compact design while maintaining uniform brightness appearance
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 effectively reduces uneven brightness and minimizes the recognition of bright spots, thereby enhancing the display quality of liquid crystal display devices.
Implementation Method 1
Light rays emitted by the light source enter the light guide member through a light entering portion of the light guide member and exit the light guide member through a light exiting portion
Implementation Method 2
The optical sheet is disposed over the light exiting plate surface and configured to exert optical effects on the light exiting from the light guide plate through the light exiting plate surface
Data Source
AI summary
A lighting device includes a light source, a light guide plate, an optical sheet, and a light blocking member. The light guide plate includes a section of a peripheral surface opposed to the light source defined as a light entering surface, a section of the peripheral surface opposite from the light entering surface defined as an opposite surface, and a light exiting plate surface through which light exits. The optical sheet is disposed over the light exiting plate surface. The light blocking member is in an outer edge area of at least one of the light guide plate and the optical sheet to block the light from the light guide plate through the light exiting plate surface. The light blocking member extends in a peripheral direction along the peripheral surface in which the light entering surface and the opposite surface are arranged.