Segmented Light Guide Member for Local Dimming in Displays
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Solution Overview
Problem
Existing display apparatus backlights face difficulties in implementing local dimming due to the inability to restrict light supply in specific regions effectively.
Innovation Solution
A display apparatus with a backlight featuring a light guide plate and light source units, where the light guide member has a protruding exit portion and reflectors to control light emission, allowing for localized dimming by adjusting light distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate with LEDs disposed opposite to both sides is used, then light can be supplied to the display panel, but local dimming cannot be implemented
Solution Approach 1:
The backlight is divided into multiple light source units, each with its own light guide member and LEDs. This segmentation allows independent control of light supply to different regions of the display panel, enabling local dimming functionality while maintaining overall illumination.
Solution Approach 2:
Different regions of the backlight are equipped with independent light source units that can be controlled separately. This allows specific regions to have different illumination characteristics, enabling local dimming and improved adaptability to different display requirements.
2Illumination intensity
If light is supplied through the light guide plate, then illumination is achieved, but control over specific region light supply is difficult
Solution Approach 1:
The backlight is divided into multiple independently controllable light source units, each with its own light guide member. This segmentation enables precise control over light supply to specific regions, making it easy to implement local dimming and region-specific illumination control.
3Adaptability or versatility
If the light guide member has a protruding exit portion, then light emission is localized, but device complexity increases
Solution Approach 1:
The light guide member includes a protruding exit portion that extends in the thickness direction (depth dimension) of the light guide plate. This dimensional extension allows the light guide member to make direct contact with the light guide plate and control light emission from specific regions, achieving localized light distribution while the added complexity is confined to a single dimensional element.
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
Enables efficient local dimming by emitting light only from specific regions of the light guide plate, reducing bezel width and enhancing light control, thereby improving display performance.
Implementation Method 1
a light guide member formed of a transparent material and having a front surface come in contact with the rear surface of the light guide plate
Implementation Method 2
The light guide member may include a pair of reflectors disposed on widthwise both side surfaces of the exit portion to reflect light.
Implementation Method 3
a plurality of light emitting diodes (LEDs) disposed on the pair of substrates to be spaced apart from each other lengthwise along the light guide plate
Data Source
AI summary
Provided is a display apparatus including a display panel, a light guide plate arranged behind the display panel, a light guide member configured to guide light toward a rear surface of the light guide plate, the light guide member formed of a transparent material and arranged to have a front surface come in contact with the rear surface of the light guide plate, and a light source configured to supply light to the light guide member, wherein the light guide member includes a light guide portion having a width and a length longer than the width and configured to guide widthwise movement of light supplied from the light source and an exit portion protruding forward from the light guide portion to guide the light to be emitted toward the rear surface of the light guide member.