Collimated Light-Emitting Panel for Switchable Viewing Angles
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Solution Overview
Problem
Existing display technologies struggle to provide a simple, cost-effective, and power-efficient solution for switching between wide and narrow viewing angles, particularly in self-light-emitting displays like micro LEDs and mini LEDs, without increasing complexity or thickness.
Innovation Solution
A light-emitting panel design featuring a light-emitting element with multiple light-emitting parts and a collimation structure, allowing for switching between wide and narrow viewing angles by controlling different parts of the light-emitting element to emit light, eliminating the need for additional layers or complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If anti-peep film is attached on the display screen to reduce viewing angle, then narrow viewing angle mode is achieved, but the structure becomes more complex and cost increases due to additional film layers
Solution Approach 1:
The light-emitting element is divided into multiple independent light-emitting parts (first light-emitting part and second light-emitting part), each capable of emitting light independently. By controlling different light-emitting parts to emit light, the display can switch between wide viewing angle mode (both parts emit) and narrow viewing angle mode (only one part emits with collimation structure), eliminating the need for additional anti-peep films and achieving viewing angle switching with simple structure.
Solution Approach 2:
The patent implements dynamic switching between wide and narrow viewing angles by dynamically controlling which light-emitting parts are activated. The collimation structure can be positioned over different light-emitting parts through voltage control, enabling the viewing angle to be adjusted dynamically without physical movement of components or additional film layers, thus maintaining structural simplicity while achieving versatility.
2Adaptability or versatility
If double liquid crystal cells are configured to adjust viewing angle, then switching between wide and narrow viewing angles is achieved, but the thickness and power consumption increase
Solution Approach 1:
Instead of using two complete liquid crystal layers, the patent segments the light-emitting element into multiple light-emitting parts that can be independently controlled. This segmentation allows viewing angle switching to be achieved by activating different segments rather than stacking multiple liquid crystal cells, significantly reducing the panel thickness while maintaining the viewing angle switching capability.
Solution Approach 2:
The patent replaces the mechanical stacking of double liquid crystal cells with an electrical control system that activates different light-emitting parts. This substitution eliminates the need for additional liquid crystal layers and their associated alignment layers, reducing thickness while achieving the same viewing angle adjustment function through electrical control of light emission.
3Adaptability or versatility
If double liquid crystal cells are configured to adjust viewing angle, then switching between wide and narrow viewing angles is achieved, but the power consumption increases
Solution Approach 1:
By segmenting the light-emitting element into multiple independently controllable parts, the patent enables selective activation of only the necessary light-emitting parts for the current viewing angle mode. This reduces the total power consumption compared to using double liquid crystal cells where both layers must be actively controlled regardless of the desired viewing angle.
Solution Approach 2:
The patent applies local quality by providing different structures to different light-emitting parts - specifically, the collimation structure is positioned over only the first light-emitting part. This allows the display to achieve narrow viewing angle mode by activating only the collimated light-emitting part, reducing power consumption compared to the double liquid crystal cell approach where the entire liquid crystal structure must be activated.
4Ease of manufacture
If existing anti-peep display with anti-peep functional layer is disposed, then narrow viewing angle is achieved, but the structure becomes complex and heavy requiring higher fabrication process requirements
Solution Approach 1:
The patent merges the anti-peep function with the light-emitting element structure itself. The collimation structure is integrated into the light-emitting element, and the same structure that produces light is also responsible for controlling the viewing angle. This merging eliminates the need for separate anti-peep functional layers and their complex fabrication processes, while maintaining the ability to switch between wide and narrow viewing angles.
Solution Approach 2:
The light-emitting element is designed to serve multiple functions: it produces light for display and simultaneously controls the viewing angle through its segmented structure and integrated collimation. This multi-functionality eliminates the need for separate anti-peep layers and their associated complex fabrication processes, achieving both display and viewing angle control in a single integrated structure.
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
Enables seamless switching between wide and narrow viewing angles with a simplified structure, reduced cost, and lower power consumption, applicable to self-light-emitting displays.
Implementation Method 1
a collimation structure is on a side of the first light-emitting part away from the substrate; and an orthographic projection of the collimation structure on the substrate is overlapped with an orthographic projection of the first light-emitting part on the substrate
Data Source
AI summary
A light-emitting panel and a display apparatus are provided in the present disclosure. The light-emitting panel includes light-emitting units, where the light-emitting unit includes a pixel circuit and a light-emitting element which are electrically connected to each other, the light-emitting element includes light-emitting parts, and a plurality of light-emitting parts in one light-emitting element includes first and second light-emitting parts; and a substrate, where a collimation structure is on a side of the first light-emitting part away from the substrate, and an orthographic projection of the collimation structure on the substrate is overlapped with an orthographic projection of the first light-emitting part on the substrate. In the first light-emitting mode, the pixel circuit only controls the first light-emitting part of the light-emitting element to emit light; and in the second light-emitting mode, the pixel circuit at least controls the second light-emitting part of the light-emitting element to emit light.