Micro LED Backlight Unit for High Contrast LCDs
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Solution Overview
Problem
Conventional liquid crystal display devices rely on backlight units that do not efficiently manage light emission, affecting screen quality, power consumption, and design, particularly in minimizing weight and thickness, especially in large-sized displays.
Innovation Solution
A backlight unit incorporating a substrate with a driving circuit and a light source array of micro light-emitting elements, where each micro element is greater than 0 and less than 100 μm in size, capable of local dimming and color conversion to emit blue light converted into white light, optimizing light distribution and energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional backlight units are used, then the display device can be manufactured, but power consumption is high and image quality is limited
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light emitting regions corresponding to different pixel groups. Each region can be dimmed or turned off independently, allowing precise local light control that reduces overall power consumption while maintaining high image quality in visible areas through enhanced contrast and brightness control.
Solution Approach 2:
Different regions of the backlight unit are controlled with different brightness levels according to the actual display content requirements. This local quality control enables dark regions to be dimmed for power savings while bright regions maintain high luminance for image quality, resolving the contradiction between power consumption and image quality.
2Measurement precision
If the number of light-emitting elements is increased to match or exceed the number of pixels, then light control precision is improved, but device complexity increases
Solution Approach 1:
The display area is divided into multiple pixel groups, with each group served by dedicated micro light-emitting elements. This segmentation enables precise light control for each pixel group while managing device complexity through systematic organization and grouping of elements rather than individual control of every single element.
Solution Approach 2:
Multiple micro light-emitting elements are grouped to serve multiple pixel groups simultaneously. This multi-functionality approach allows the same type of micro LED components to control multiple pixels, reducing the overall complexity compared to having entirely separate control circuits for each pixel while maintaining high light control precision.
3Manufacturing precision
If micro light-emitting elements with size less than 100 μm are used, then light distribution precision is improved, but manufacturing difficulty increases
Solution Approach 1:
The use of micro-scale light-emitting elements with dimensions less than 100 μm enables precise light distribution matching pixel dimensions. The segmentation of the backlight into these small units provides the necessary manufacturing precision for high-resolution displays while the modular nature of micro LEDs facilitates their integration despite the challenging size.
Solution Approach 2:
The patent specifies a size parameter range (less than 100 μm) for micro light-emitting elements that balances manufacturing feasibility with light distribution precision. This parameter change from conventional larger LEDs to micro-scale elements achieves the required precision while remaining within manufacturable limits through established micro LED fabrication techniques.
4Illumination intensity
If local dimming is implemented with multiple groups of micro light-emitting elements, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The backlight unit is segmented into multiple dimming zones corresponding to different pixel groups, with each zone independently controllable. This segmentation enables local dimming that significantly improves contrast ratio by creating dark zones behind black pixels while maintaining brightness in other areas, managing complexity through zonal control rather than pixel-level control.
Solution Approach 2:
Different regions of the backlight are assigned different brightness qualities according to the local image content. This local quality approach enhances contrast ratio by providing high brightness where needed and deep darkness where required, while the grouping strategy manages device complexity by controlling regions rather than individual pixels.
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
Enhances image quality by increasing contrast ratio and reducing power consumption through precise light control and efficient energy use, while minimizing weight and thickness in liquid crystal display devices.
Implementation Method 1
Each of the plurality of micro light-emitting elements may be configured to emit blue light
Implementation Method 2
The light source array may further include at least one color conversion layer configured to convert a color of the light emitted from the plurality of micro light-emitting elements into white light
Data Source
AI summary
Provided is a backlight unit configured to emit light to a liquid crystal display device including a plurality of pixels, the backlight unit including a substrate including a driving circuit, and a light source array including a plurality of micro light-emitting elements provided on the substrate, wherein a number of micro light-emitting elements is equal to or greater than a number of the plurality of pixels.