Light Mixing Structure for Uniform Brightness in Small Display Panels
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Solution Overview
Problem
Small-size display panels experience wide fluctuation in brightness due to the use of LED light bars with different brightness levels, leading to a 'glowworm phenomenon' of alternately dark and bright dots, which is not effectively addressed by current brightness mixing solutions.
Innovation Solution
A light mixing structure is disposed on the end surface of the light guide plate, featuring concave and convex parts that alternate and mix the light from first and second light sources with different brightness levels, ensuring uniform brightness and reducing the glowworm effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs with different brightness levels are used in LED light bars, then the brightness fluctuation range among various backlights increases, but the small-size display panel is sensitive to brightness mixing and may cause glowworm phenomenon
Solution Approach 1:
A light mixing structure is introduced as an intermediary component between the light guide plate and the display panel. This structure includes a light mixing layer with light scattering particles that diffuses and mixes the light from LEDs of different brightness levels before it reaches the display panel, thereby eliminating the glowworm phenomenon while maintaining brightness uniformity across backlights
Solution Approach 2:
The invention changes the optical parameters of the light mixing structure by adjusting the concentration, size distribution, and refractive index of light scattering particles in the light mixing layer. These parameter changes optimize the light scattering effect to achieve uniform brightness distribution without causing visible alternately dark and bright dots
2Object-affected harmful factors
If a light mixing structure is introduced to mix light from LEDs of different brightness, then the glowworm phenomenon is avoided, but the device complexity increases
Solution Approach 1:
The light mixing structure serves multiple functions simultaneously: it mixes light from LEDs of different brightness levels, scatters light to eliminate the glowworm phenomenon, and maintains optical coupling between the light guide plate and display panel. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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 avoids the glowworm phenomenon and improves the backlight effect by ensuring uniform brightness across the small-size display panel, reducing the difference in brightness between various backlights.
Implementation Method 1
a light mixing structure is disposed on the end surface of the edge of light guide plate and is capable of mixing the light emitted from the first light source and the light emitted from the second light source into light with uniform brightness
Data Source
AI summary
The present invention provides a backlight, a display panel and a display device, The backlight includes: a first light source and a second light source, the brightness of light emitted from the first light source is different from that of light emitted from the second light source; and a light guide plate, the first light source and the second light source are disposed above the same end surface of an edge of the light guide plate, and light-emitting surfaces of the first light source and the second light source face the end surface of the edge of the light guide plate, a light mixing structure is disposed on the end surface of the edge of light guide plate and is capable of mixing the light emitted from the first light source and the light emitted from the second light source into light with uniform brightness.