Light-Emitting Substrate Layout to Block LED Crosstalk
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Solution Overview
Problem
The use of black glue to block lateral light emission between LEDs in LED arrays leads to reduced light efficiency as it covers the LEDs, affecting the light emitted in the target direction.
Innovation Solution
A light-emitting substrate with a first light-shielding structure arranged at the gaps between LEDs to shield lateral light emission without overlapping with the target light-emitting direction, using materials like a black matrix or metal, and optionally incorporating light guide pillars and planarization layers to enhance light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black glue is used to fill the gap between LEDs to block lateral light transmission, then light crosstalk is avoided, but the black glue covers the LED and reduces light emitted in the target direction, affecting light efficiency
Solution Approach 1:
The light-shielding function is segmented from the gap-filling function. The first light-shielding structure is positioned only at the gaps between LEDs to block lateral light, while the second light-shielding structure (if needed) is positioned at the top end side. This segmentation ensures that the light-shielding structures do not cover the LED emission surfaces, thus avoiding reduction of light efficiency while still preventing light crosstalk.
Solution Approach 2:
The light-shielding structures are positioned in the lateral dimension (at the gaps between LEDs) rather than covering the top emission dimension. By changing the spatial dimension of light shielding from vertical coverage to lateral positioning, the patent blocks lateral light transmission without obstructing the target light-emitting direction, thereby resolving the contradiction between preventing crosstalk and maintaining light efficiency.
2Object-affected harmful factors
If black glue is applied to fill gaps between LEDs, then lateral light emission is blocked, but the overall light output in the target direction is reduced
Solution Approach 1:
The light-shielding function is segmented from the gap-filling function. The first light-shielding structure is positioned only at the gaps between LEDs to block lateral light, while the second light-shielding structure (if needed) is positioned at the top end side. This segmentation ensures that the light-shielding structures do not cover the LED emission surfaces, thus avoiding reduction of light efficiency while still preventing light crosstalk.
Solution Approach 2:
The light-shielding structures are positioned in the lateral dimension (at the gaps between LEDs) rather than covering the top emission dimension. By changing the spatial dimension of light shielding from vertical coverage to lateral positioning, the patent blocks lateral light transmission without obstructing the target light-emitting direction, thereby resolving the contradiction between preventing crosstalk and maintaining light efficiency.
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 prevents light crosstalk while maintaining high light efficiency and brightness by shielding lateral light without obstructing the target emission direction, improving the overall light-emitting effect.
Implementation Method 1
a first light-shielding structure is arranged at a gap between the plurality of light-emitting devices, and the first light-shielding structure is configured to shield light emitted from the plurality of light-emitting devices laterally
Implementation Method 2
the light-emitting substrate includes a light guide pillar, and a refractive index of a material of the light guide pillar is greater than a first set value; the light guide pillar corresponds to the plurality of light-emitting devices in a target light-emitting direction
Data Source
AI summary
A light-emitting substrate and a manufacturing method are provided. The light-emitting substrate includes a substrate and light-emitting devices arranged at intervals thereon. Light-shielding structure is at a gap between the light-emitting devices and shields light emitted from the light-emitting devices laterally. The light-shielding structure and light-emitting devices do not overlap in a target light-emitting direction of the light-emitting devices, or overlap in a target light-emitting direction of the light-emitting devices by being less than a width. Since the light-shielding structure is at the gap between the light-emitting devices, light emitted by the light-emitting devices laterally is shielded, avoiding light from irradiating other devices and causing light crosstalk. Light from the light-emitting devices in the target light-emitting direction is not shielded or not completely shielded, eliminating an adverse effect on light efficiency of the light-emitting devices, improving the light-emitting effect of the light-emitting surface of the light-emitting substrate.