Backlight Unit Light Incident Hole for Reliable Color Detection
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Solution Overview
Problem
Conventional backlight units for LCD devices face challenges in reliability, particularly in accurately controlling and mixing the red, green, and blue lights emitted by LEDs, which affects the quality and consistency of the white light output.
Innovation Solution
A backlight unit design featuring a support main with a mold frame, LEDs, a light guide plate, an optical sensor unit, and a light incident hole that guides light from the guide plate to the sensor unit, allowing for improved light path correction and detection, enhancing the reliability of light detection and color correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight units use multiple LEDs emitting red, green, and blue lights, then the light source can provide white light mixed with these colors, but the reliability of light detection and color correction deteriorates
Solution Approach 1:
The patent segments the light detection function by providing separate detection paths for different colors of light. The light incident hole is positioned to receive specific wavelengths from LEDs, enabling independent detection of red, green, and blue light intensities. This segmentation allows accurate color correction while maintaining reliable detection of each color component separately.
Solution Approach 2:
The patent introduces a light incident hole as an intermediary structure between the LEDs and the optical sensor unit. This hole serves as a dedicated light reception path that guides light from specific LED regions to the sensor, improving the reliability of light detection by isolating the detection path from other light paths and reducing interference.
2Device complexity
If the optical sensor unit is arranged at the other side of the support main, then the structure is simplified, but the light path guidance and detection precision deteriorate
Solution Approach 1:
The patent solves the detection precision problem by transitioning from a planar arrangement to a three-dimensional light path configuration. The light incident hole creates a vertical or angled light path that guides light from the LED side through the support main to the optical sensor unit on the other side. This dimensional change enables precise light detection despite the simplified structural arrangement.
3Device complexity
If no light incident hole is provided, then the structure is simpler, but the color correction accuracy deteriorates
Solution Approach 1:
The light incident hole is formed in advance during the support main manufacturing process, creating a pre-defined light path channel. This preliminary action ensures that light from specific LED regions is accurately guided to the optical sensor unit, enabling precise color correction without adding complex post-processing steps or components.
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 design improves the reliability of light detection and color correction, resulting in more consistent white light output from the backlight unit, thereby enhancing the overall performance of the LCD device.
Implementation Method 1
a light guide plate arranged parallel to the plurality of LEDs and converting a point light to a surface light
Implementation Method 2
a light guide plate arranged parallel to the plurality of LEDs and converting a point light to a surface light
Implementation Method 3
an optical sensor unit arranged at the other side of the support main and detecting light emitted from the plurality of LEDs
Data Source
AI summary
A backlight unit having improved reliability is disclosed.The backlight unit includes a support main formed of a mold having a rectangular frame shape, a plurality of LEDs arranged at a side of the support main, a light guide plate arranged parallel to the plurality of LEDs and converting a point light to a surface light, an optical sensor unit arranged at the other side of the support main and detecting light emitted from the plurality of LEDs, and a light incident hole formed at the other side of the support main corresponding to the optical sensor unit and guiding light output from the light guide plate to proceed toward the optical sensor unit by changing a path of the light.