Backlight Unit Heat Dissipation for LCD Light Coupling Efficiency
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Solution Overview
Problem
Large-sized high-definition LCD panels face challenges with reduced transmittance and heat dissipation issues, leading to non-uniform brightness and potential LED damage due to increased light coupling distance and edge light leakage, which reduces light coupling efficiency and increases the risk of mura phenomena.
Innovation Solution
A backlight unit design featuring a light guide plate with edge type light source components and a heat dissipation element that contacts substrates of these components, along with space retainers to maintain a consistent light coupling distance and prevent overheating, utilizing a heat dissipation element with varying widths and parallel grooves for efficient heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light coupling distance between the LED and the light guide plate is increased to avoid warping and light leakage, then the reliability of the light guide plate is improved, but the light coupling efficiency is greatly decreased
Solution Approach 1:
The patent applies local quality by creating a light coupling cavity with specific geometric features (inclined surfaces and reflection surfaces) at the light coupling region. This localized structural modification enables effective light coupling within a short distance while preventing light leakage, thus resolving the contradiction between maintaining short coupling distance for efficiency and ensuring reliability.
2Illumination intensity
If both short and long sides of the light guide plate are provided with edge type light sources to enhance backlight brightness, then the illumination intensity is improved, but the heat dissipation uniformity deteriorates causing mura phenomenon
Solution Approach 1:
The patent segments the heat dissipation function by providing separate heat dissipation cavities for LEDs on the short side and long side of the light guide plate. Each cavity is independently configured to optimize heat dissipation for its respective LED group, preventing heat accumulation and ensuring uniform temperature distribution, thus resolving the contradiction between high brightness and uniform heat dissipation.
3Reliability
If the light coupling distance is increased to prevent light leakage, then the light guide plate warping risk is reduced, but the light coupling efficiency is greatly reduced
Solution Approach 1:
The patent creates a specialized light coupling cavity with inclined surfaces and reflection surfaces at the light coupling region. This localized structural design enables effective light coupling within a short distance while preventing light leakage, thus resolving the contradiction between maintaining short coupling distance for efficiency and ensuring reliability through warping prevention.
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 enhances light coupling efficiency and prevents LED damage by ensuring uniform heat dissipation and maintaining optimal light coupling distances, thereby improving display brightness and extending the service life of the backlight unit.
Implementation Method 1
a heat dissipation element that contacts a first substrate of the first light source component and a second substrate of the second light source component simultaneously and is disposed on a bottom of the light guide plate
Implementation Method 2
The space retainers are elastic members
Data Source
AI summary
A backlight unit of high light coupling efficiency including a light guide plate, a first light source component and a second light source component disposed beside two neighboring side walls of the light guide plate, and a heat dissipation element that contacts a first substrate of the first light source component and a second substrate of the second light source component simultaneously and is disposed on a bottom of the light guide plate. The backlight unit of the present disclosure can effectively dissipate heat generated during the operation of the light source components, thereby avoiding the mura phenomenon caused by a change of a light coupling distance due to the expansion of the light guide plate because of overheating.