Display Substrate Layout With Electrochromic Layer for Pixel Crosstalk
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Solution Overview
Problem
OLED display devices face low gray scale cross-talk due to uneven current distribution among blue, green, and red pixels, leading to poor display uniformity and crosstalk issues.
Innovation Solution
A display substrate with a light-emitting device layer and an electrochromic functional layer is stacked on a substrate, where the electrochromic functional layer is positioned to absorb or refract light from non-driven pixels, reducing cross-talk by controlling light transmission states with electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large voltage is applied to blue organic light-emitting material to light up blue pixels, then blue pixel brightness is improved, but current flows to green and red pixels causing low gray scale cross talk
Solution Approach 1:
An electrochromic functional layer is introduced as an intermediary component between the light-emitting device layer and the substrate. This layer selectively absorbs or blocks light from non-driven pixels (green and red pixels when blue pixel is activated) to prevent cross-talk, while allowing light from driven pixels to pass through. The electrochromic material changes its optical properties based on applied voltage, acting as a controllable mediator that eliminates the harmful light leakage without affecting the desired light emission.
2Reliability
If carrier migration occurs in transmission layers of light-emitting device layer, then current distribution among RGB pixels becomes uneven, but display uniformity deteriorates
Solution Approach 1:
The invention converts the harmful effect of carrier migration and uneven current distribution into a beneficial outcome. By introducing the electrochromic functional layer, the system compensates for the uneven current distribution by selectively blocking light from pixels that received excessive current. This transforms the problematic carrier migration effect into a controllable parameter, where the electrochromic layer adjusts its light absorption to balance the overall display uniformity despite unequal current distribution among pixels.
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
This configuration improves display uniformity by minimizing low gray scale cross-talk and enhancing the overall display effect by ensuring even light distribution across pixels.
Implementation Method 1
the electrochromic functional device is configured to absorb light emitted by the corresponding pixel units under a control of an electric signal
Implementation Method 2
under the control of the electric signal, a refraction of the light emitted by the corresponding pixel unit is increased
Implementation Method 3
when the pixel units receive the driving voltage signal, the electrochromic functional device is further configured to transmit the light emitted by the corresponding pixel units under the control of the electric signal
Data Source
AI summary
A display substrate, a method of forming a display substrate and a display device are provided. The display substrate includes: a plurality of pixel units arranged in an array, a substrate, a light-emitting device layer and an electrochromic functional layer, where the light-emitting device layer and the electrochromic functional layer are stacked on the substrate; the light-emitting device layer includes a plurality of light-emitting devices, an orthographic projection of the electrochromic functional device on the substrate is at least partially overlapped with an orthographic projection of the corresponding effective light-emitting area on the substrate.