Display Panel Light Extraction and Electrochromic Ambient Light Control
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Solution Overview
Problem
Existing quantum dot electroluminescent light-emitting diodes face challenges in achieving high quantum efficiency and industrialization, with issues related to light extraction and external ambient light interference.
Innovation Solution
A display panel design incorporating light extraction structures and electrochromic structures, where light extraction structures condense light from quantum dot light-emitting devices, and electrochromic structures adjust transparency based on device operation, enhancing light extraction efficiency and reducing external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light extraction structures are added to improve light extraction efficiency, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs microlens structures with curved surfaces positioned above the light-emitting devices. These spherical or hemispherical lenses utilize optical refraction to converge and extract light more efficiently from the quantum dot LEDs, improving light extraction efficiency without adding complex mechanical components.
Solution Approach 2:
The patent introduces an electrochromic layer as an intermediary component between the light-emitting devices and the external environment. This layer acts as a controllable optical mediator that can dynamically adjust its transparency to control ambient light interference while maintaining a relatively simple overall device structure.
2Object-affected harmful factors
If electrochromic structures are added to reduce external ambient light interference, then anti-interference capability is improved, but device complexity increases
Solution Approach 1:
The patent utilizes electrochromic materials that can change their optical properties (transparency/opacity) in response to electrical signals. This allows the display to dynamically adapt to varying ambient light conditions, effectively reducing external light interference through material property changes rather than complex mechanical or optical structures.
3Use of energy by moving object
If quantum dot electroluminescent LEDs are used to achieve high quantum efficiency, then light emission efficiency is improved, but light extraction remains challenging
Solution Approach 1:
The microlens structures with curved surfaces are specifically designed to address the light extraction challenge in high quantum efficiency LEDs. The spherical geometry creates optimal refraction angles that capture more of the internally generated light and direct it outward, solving the light extraction problem inherent in high-efficiency quantum dot devices.
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
Improves light extraction efficiency and reduces power consumption while maintaining display brightness and adjusting transparency, addressing the limitations of traditional quantum dot displays.
Implementation Method 1
the light extraction structures are configured to draw in light emergent from the light-emitting devices
Implementation Method 2
the electrochromic structures are configured to be in a transparent state when the light-emitting devices emit light, and to be in a shading state when the light-emitting devices do not emit light
Data Source
AI summary
A display panel, a display device, and a fabricating method of a display panel. The display panel includes: a base substrate (1); a plurality of light-emitting devices (2) on a side of the base substrate (1); and additional members on a side of the light-emitting devices (2) away from the base substrate (1). The additional members includes light extraction structures (3) and electrochromic structures (4), where orthographic projections of the light extraction structures (3) on the base substrate (1) overlap orthographic projections of the light-emitting devices (2) on the base substrate (1), and the light extraction structures are configured to draw in light from the light-emitting devices (2); and orthographic projections of the electrochromic structures (4) on the base substrate (1) are located between orthographic projections of adjacent light-emitting devices (2) on the base substrate (1), and the electrochromic structures are configured such that the electrochromic structures (4) are in a transparent state when the light-emitting devices (2) emit light, and electrochromic structures (4) are in a shading state when the light-emitting devices (2) do not emit light.