Backlight Assembly Light Guide Element Crosstalk Prevention
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Solution Overview
Problem
Existing direct-lit backlight assemblies have low power consumption and brightness due to low light utilization from light-emitting elements, leading to the halo problem caused by light crosstalk between backlight sub-regions.
Innovation Solution
A backlight assembly with a light guide element that transmits light from light-emitting elements to a display element according to a preset path, using blocking walls or through holes to prevent light crosstalk and enhance light extraction efficiency, eliminating the need for a beam splitter and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-lit backlight assembly uses multiple light-emitting elements arranged in an array to realize regional backlight adjustment, then the display apparatus can achieve higher brightness and contrast, but the light utilization rate from light-emitting elements remains low
Solution Approach 1:
The backlight assembly is divided into multiple independently controllable light-emitting elements arranged in an array, allowing regional backlight adjustment. Each element can be independently controlled to emit light only where needed, improving overall light utilization while maintaining high brightness and contrast performance.
2Adaptability or versatility
If light-emitting elements are arranged in a direct-lit backlight assembly, then regional backlight adjustment is enabled, but light crosstalk between backlight sub-regions causes the halo problem
Solution Approach 1:
The harmful light crosstalk is extracted and blocked by introducing blocking walls between adjacent light-emitting elements. These blocking walls prevent light from leaking into adjacent regions, eliminating the halo problem while preserving the ability to adjust backlight regions independently.
Solution Approach 2:
Blocking walls are introduced as intermediary structures between light-emitting elements to mediate light transmission. These walls act as barriers that prevent direct light crosstalk between adjacent elements, solving the halo problem without affecting regional adjustment capability.
3Object-generated harmful factors
If a beam splitter is used to prevent light crosstalk, then the halo problem is addressed, but device complexity increases
Solution Approach 1:
The beam splitter is completely removed from the system. Instead, simple blocking walls are used to prevent light crosstalk, significantly reducing structural complexity while maintaining effective prevention of the halo problem.
Solution Approach 2:
The complex beam splitter is replaced with simple, easy-to-manufacture blocking walls that can be directly integrated into the backlight assembly structure. These simple barriers achieve the same function of preventing light crosstalk with much lower complexity and cost.
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 improves light utilization and brightness while preventing the halo problem, achieving higher contrast and efficiency with lower energy consumption.
Implementation Method 1
a light guide element, configured to transmit light emitted from the plurality of light-emitting elements to a display element according to a preset light-guiding path
Implementation Method 2
a sidewall of the corresponding through hole at least reflects light emitted from a sidewall of the light-emitting element, such that the reflected light exits through the corresponding through hole
Data Source
AI summary
A backlight assembly and its formation method, and a display apparatus are provided in the present disclosure. The formation method includes a circuit board; a plurality of light-emitting elements, disposed at a side of the circuit board; and a light guide element, configured to transmit light emitted from the plurality of light-emitting elements to a display element according to a preset light-guiding path. The backlight assembly transmits the light emitted from the light-emitting elements to the display element according to the preset light-guiding path through the light guide element, which improves the utilization rate of the light emitted from the light-emitting elements and emits higher brightness backlight through relatively low energy consumption.