Transparent Display Module Dimming for Stable Contrast on Subway Windows
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Solution Overview
Problem
Transparent display screens installed on subway windows face reduced display contrast and worsened display effects due to varying external light intensities when transitioning from underground to ground level.
Innovation Solution
A display module comprising a transparent display panel, a dimming panel, and a light-intensity detection unit with a photosensitive sensor, where the control unit adjusts the transmittance of the dimming panel based on detected incident light intensity to maintain stable light intensity on the transparent display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transparent display screen is installed on a subway window, then it can provide display functionality in application fields such as car window display, but when the subway travels from underground to ground, the external light becomes strong which reduces the display contrast and the display effect becomes worse
Solution Approach 1:
The patent applies a dimming panel with adjustable transmittance that can dynamically change its light-blocking properties. The control unit adjusts the dimming panel's transmittance based on ambient light conditions detected by the photosensitive sensor, making the display system adaptive to varying external light environments rather than static
Solution Approach 2:
The patent implements a feedback control system where the photosensitive sensor continuously detects ambient light intensity and sends signals to the control unit. The control unit processes this feedback information and adjusts the dimming panel's transmittance accordingly, creating a closed-loop control system that automatically maintains optimal display contrast
2Illumination intensity
If a dimming panel is added to control light intensity, then the display contrast can be maintained under varying light conditions, but the device complexity increases due to additional components
Solution Approach 1:
The control unit serves multiple functions: it receives detection signals from the photosensitive sensor, processes the light intensity data, determines the appropriate transmittance level, and controls the dimming panel. This multi-functional design reduces the need for separate dedicated components for each function
Solution Approach 2:
The patent combines the transparent display panel, dimming panel, photosensitive sensor, and control unit into an integrated display module. The dimming panel is disposed at the back of the transparent display panel, and all components work together as a unified system rather than separate independent units
3Measurement precision
If the photosensitive sensor is disposed corresponding to the peripheral area, then it can detect incident light intensity accurately, but the area available for display content is reduced
Solution Approach 1:
The patent places the photosensitive sensor specifically in the peripheral area of the transparent display panel, utilizing a region that would otherwise be non-display or less important for content display. This localized placement ensures accurate light detection while minimizing impact on the main display area where content is shown
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 solution stabilizes the light intensity on the transparent display panel, enhancing display contrast and quality by automatically adjusting the dimming panel's transmittance in response to changing external light conditions.
Implementation Method 1
a light-intensity detection unit comprising a photosensitive sensor, wherein the photosensitive sensor is disposed at a side of the transparent display panel away from the display side and disposed corresponding to the peripheral area, and the light-intensity detection unit is configured to detect an incident-light intensity of an incident light
Data Source
AI summary
A control method of a display module, a display module, and a display device. The display module comprises: a transparent display panel (11) comprising an active area and a peripheral area, wherein the transparent display panel (11) has a display side; a dimming panel (12) disposed at a side of the transparent display panel (11) away from the display side; a light-intensity detection unit comprising a photosensitive sensor (13), wherein the photosensitive sensor (13) is disposed at a side of the transparent display panel (11) away from the display side and disposed corresponding to the peripheral area, and the light-intensity detection unit is configured to detect an incident-light intensity of an incident light; and a control unit (14) connected to the light-intensity detection unit and the dimming panel (12), respectively, and configured to adjust a transmittance of the dimming panel (12) according to the incident-light intensity.