Transparent Display Device with Liquid Crystal Light Control
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Solution Overview
Problem
Transparent display devices using transparent AM-OLEDs face challenges in achieving a thin thickness and maintaining image quality when bent, as they require perfect light blocking in black mode and are prone to visibility degradation in outdoor bright conditions due to external light reflection.
Innovation Solution
A transparent display device design featuring a first substrate with a pixel region and a light amount controlling region, where an organic light emitting display is integrated in the pixel region and a liquid crystal display is integrated in the light amount controlling region, utilizing microcavities and a vertical electric field mode to adjust external light transmission, allowing for a thin and flexible form factor without image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent AM-OLED is used to implement a transparent display device, then the device can transmit external light and achieve a thin form factor, but it cannot perfectly block transmitted light in black mode and suffers from visibility degradation in bright outdoor conditions due to external light reflection
Solution Approach 1:
The display device is segmented into multiple functional layers: a first substrate with pixel region, a light amount controlling region with liquid crystal display, a second substrate, and a reflective panel. Each layer performs a specific function, collectively solving the contradiction between light transmission and image quality.
Solution Approach 2:
The liquid crystal display is nested within the light amount controlling region on the first substrate, and the reflective panel is positioned between the first and second substrates. This nested structure allows multiple functions to be integrated in a compact arrangement, maintaining thin profile while improving image quality.
2Reliability
If multiple panels performing different functions are stacked vertically to solve light blocking and reflection issues, then image quality improves, but the device thickness increases
Solution Approach 1:
Instead of stacking panels vertically in the thickness direction, the invention distributes functional regions (pixel region and light amount controlling region) in the planar direction on the first substrate. This dimensional redistribution maintains thin profile while achieving improved image quality through the liquid crystal display and reflective panel integration.
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 enables a thin and flexible transparent display device that maintains image quality when bent and effectively manages external light, providing improved visibility in bright conditions by adjusting light transmission through the liquid crystal display.
Implementation Method 1
electrons injected from an electron injection electrode (cathode electrode) and holes injected from a hole injection electrode (anode electrode) are combined in an emitting layer to form exciton and the exciton emits light while discharging energy
Implementation Method 2
a liquid crystal layer having a plurality of microcavities partitioned from each other between the pixel electrode and the roof layer, wherein the microcavities comprise liquid crystal molecules
Implementation Method 3
utilizing microcavities and a vertical electric field mode to adjust external light transmission
Data Source
AI summary
A transparent display device includes a first substrate including a pixel region and a light amount controlling region. An organic light emitting display is positioned in the pixel region and includes an anode electrode, a pixel defined layer, an organic light emitting layer positioned on the anode electrode and in an opening part of the pixel defined layer, and a cathode electrode positioned on the organic light emitting layer. A liquid crystal display is positioned in the light amount controlling region and includes a pixel electrode, a roof layer facing the pixel electrode, and a liquid crystal layer having a plurality of microcavities between the pixel electrode and the roof layer. The microcavities include liquid crystal molecules. A second substrate seals the organic light emitting display and the liquid crystal display.