OLED Touch Display Infrared Transmittance
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Solution Overview
Problem
Touch controlled display devices using infrared face issues with image quality, size, and touch recognition rate due to limitations in projector technology and infrared transmittance through liquid crystal panels, which affect the performance of these devices.
Innovation Solution
A touch controlled display device incorporating an organic light emitting diode (OLED) display panel with a transmission area that transmits infrared light and a sensing plate with an infrared sensor, where the infrared source irradiates light into a total reflection plate, allowing for improved infrared transmittance and touch recognition, while minimizing interference from visible light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a projector is used as the display device, then the device can be made compact, but the image quality deteriorates due to technical limits of projectors
Solution Approach 1:
The patent merges the display function and touch sensing function into a single integrated structure. The display panel serves both as the visual output device and as the substrate for the infrared sensor array, eliminating the need for separate projector and screen components while maintaining high image quality through the display panel's native resolution
2Device complexity
If a liquid crystal display panel is used, then the device structure is simplified, but infrared transmittance deteriorates due to the shutter function of liquid crystal
Solution Approach 1:
The patent changes the material parameter of the display panel from liquid crystal to organic light emitting diode (OLED), which inherently allows high infrared transmittance without the shutter effect. This material substitution resolves the contradiction by providing both structural simplicity and excellent infrared transmission properties
Solution Approach 2:
The patent introduces an infrared transmission layer as an intermediary component between the display panel and the infrared sensor. This layer is specifically designed to transmit infrared light while blocking visible light, thereby enhancing infrared transmittance to the sensor without affecting the display function
3Length of stationary object
If the infrared sensor is placed close to the display panel, then the device size is reduced, but visible light interference increases affecting touch recognition
Solution Approach 1:
The patent introduces an infrared transmission layer as an intermediary component between the display panel and the infrared sensor. This layer is specifically designed to transmit infrared light while blocking visible light, thereby enhancing infrared transmittance to the sensor without affecting the display function
Solution Approach 2:
The patent applies selective optical properties to different layers: the infrared transmission layer has high transmittance for infrared wavelengths but high absorption for visible wavelengths. This local quality differentiation allows the sensor to be positioned close to the display panel while preventing visible light interference through the wavelength-selective filtering property
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 enhances display quality, reduces device size, and improves touch recognition rates by optimizing infrared transmittance and blocking visible light interference, resulting in a more efficient and compact touch controlled display device.
Implementation Method 1
an infrared source configured to irradiate infrared light into the total reflection plate such that the infrared light travels along the first surface within the total reflection plate
Implementation Method 2
each pixel including a transmission area and a display area, the transmission area being configured to transmit light therethrough
Implementation Method 3
A touch controlled display device incorporating an organic light emitting diode (OLED) display panel
Data Source
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AI summary
A touch controlled display device. The device comprises: a display panel including a first surface, a second surface opposing the first surface and a plurality of pixels between the first and second surfaces, each pixel including a transmission area and a display area, the transmission area being configured to transmit light therethrough, an infrared source located on the side of the second surface of the display panel and configured to irradiate infrared light toward the first surface through the second surface, and an infrared sensor located on the side of the second surface of the display panel and configured to detect infrared light from the first surface through at least one transmission area of the plurality of pixels.