Backlight Device Light Guide Plate Color Mixing
Solution Overview
Problem
Conventional backlight devices exhibit color unevenness on the sides of the light guide plate due to unmixing of light from different illuminants, resulting in inconsistent light emission.
Innovation Solution
A backlight device design that includes a light guide plate with green and red illuminants emitting light with a blue component, and white illuminants positioned at the ends to ensure uniform light distribution, suppressing color unevenness by mixing lights within the plate and using reflective surfaces to maintain white light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If green and red illuminants are positioned at opposite sides of the light guide plate, then the light guide plate can emit light from both sides, but color unevenness occurs on the side surfaces due to unmixing of light
Solution Approach 1:
A white illuminant is introduced as an intermediary element positioned at the end of the incident surface. This white illuminant emits white light that mixes with the green and red light within the light guide plate, thereby suppressing color unevenness on the side surfaces while maintaining the dual-side emission capability.
2Illumination intensity
If green and red illuminants are used to emit colored light, then color rendering is improved, but color unevenness and inconsistency occur on the emission surface
Solution Approach 1:
The patent merges the white light from the white illuminant with the colored light from the green and red illuminants. This combination allows the light guide plate to maintain good color rendering while achieving color consistency across the emission surface, as the white light acts as a balancing element that uniformizes the overall color output.
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 suppresses color unevenness on the sides of the light guide plate by mixing green and red light with blue components, ensuring consistent white light emission across the emission surface, enhancing the uniformity of light distribution.
Implementation Method 1
a light guide plate 3 having an incident surface 35, a first side surface 31 extending from a first end of the incident surface 35, and a second side surface 32 extending from a second end of the incident surface 35
Implementation Method 2
mixing green and red light with blue components, ensuring consistent white light emission across the emission surface
Implementation Method 3
A green illuminant is disposed facing the incident surface and configured to emit a green light toward the incident surface. A red illuminant is disposed facing the incident surface and configured to emit a red light toward the incident surface
Implementation Method 4
A white illuminant is disposed on a side of at least one end of both ends of the incident surface and configured to emit a white light toward the light guide plate
Data Source
AI summary
A backlight device includes a light guide plate having an incident surface, a first side surface, and a second side surface. The first side surface extends from a first end of the incident surface and the second side surface extends from a second end of the incident surface. A green illuminant faces the incident surface and emits a green light toward the incident surface. A red illuminant faces the incident surface and emits a red light toward the incident surface. A white illuminant disposed on a side of at least one end of the first and second ends of the incident surface emits a white light toward the light guide plate. At least one of the emitted green light and the emitted red light includes a blue component having an emission peak wavelength in a range of 420 to 500 nm.