Large-size Micro LED interactive display device based on light touch control

Abstract

The utility model provides a large-size Micro LED interactive display device based on optical touch control, which comprises a glass-based Micro LED display screen, and an optical touch control screen formed by splicing at least two small-size optical touch control modules is arranged below the glass-based Micro LED display screen; the photoelectric detector array is arranged on the side face, back to the glass-based Micro LED display screen, of the light touch screen, and the photoelectric detector array is located at the spliced gap of the adjacent light touch modules. According to the scheme, the spliced small-size light touch modules are adopted to form the large-size Micro LED interactive display device, and the problems that in the prior art, the grating preparation area is limited, large-area gratings are not uniform, the coupling efficiency is affected, and the preparation cost of a large-size nickel plate mother set is very high are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the micro LED semiconductor display technical field, concretely relates to a large size micro LED interactive display device based on optical touch. BACKGROUND

[0002] With the development of information, people have higher and higher requirements for the interactive mode of display. Although the contact type interactive display has occupied people's daily life, such as tablet computer, smart phone and the like, the non-contact interactive technology with wider scene applicability still has great development space.

[0003] In the non-contact remote interaction of large size display, inertial gyroscope and gesture recognition are common technologies, but the inertial gyroscope has low control precision and high learning cost, and the gesture recognition is often limited by the focal point and angle of view of the lens, and cannot completely meet the use requirement. The remote optical touch technology based on grating antenna coupling becomes a technology that can overcome the above-mentioned shortcomings and truly implement accurate, fast and three-point-one-line human eye habit remote interaction technology.

[0004] At present, the optical touch technology based on grating antenna coupling mainly has two problems: process and response error. From the process, the preparation cycle grating needs nanoimprint technology, and the nickel plate master is pressed on the PC substrate to imprint the grating structure, and this process will have the problem of uneven cycle in the case of large area preparation, which seriously affects the coupling efficiency, and the cost of large area nickel plate is high. From the technology, since the signal light will deviate in the vertical direction with the increase of distance, the final positioning position of the detector will be deviated with the change of angle, resulting in inaccurate positioning, and serious response error will be caused for large size display. UTILITY MODEL CONTENTS

[0005] In order to solve the above-mentioned problems in the prior art, the utility model provides a large size micro LED interactive display device based on optical touch, which splices small size optical touch modules for large size LED display device, changes the light wave propagation direction at the section, sets the photoelectric detector on the back, realizes the zero gap splicing to form the large size LED display device based on optical touch.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A large-size Micro LED interactive display device based on optical touch, comprising a glass-based Micro LED display screen, an optical touch screen formed by splicing at least two small-size optical touch modules below the glass-based Micro LED display screen; a photodetector array is arranged on the side of the optical touch screen away from the glass-based Micro LED display screen, and the photodetector array is located at the joint gap between adjacent optical touch modules.

[0008] Preferably, the opposite ends of the two adjacent optical touch modules are provided with splicing inclined surfaces, and the two splicing inclined surfaces form a V-shaped space.

[0009] Preferably, a reflective layer is arranged on the splicing inclined surface of the optical touch module, and the reflective layer is a metal reflective layer.

[0010] Preferably, the optical touch module comprises a substrate and a periodic grating structure on the upper surface of the substrate; the periodic grating structure is a concave-convex structure formed on the upper surface of the substrate through shallow etching.

[0011] Preferably, the photodetector array is located on the lower surface of the substrate and is fixed on the substrate by means of hot adhesive.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. In the utility model, small-size optical touch modules are spliced to form a large-size optical touch screen for large-size Micro LED interactive display. The splicing of small-size modules shortens the propagation distance of waveguide light in the vertical direction, reduces signal error, and can realize accurate position touch in combination with driving algorithm. Compared with the current market electrical touch method (generally adopting flexible circuit COF bending to the back or through glass punching method), the method of changing optical propagation path has lower cost. The small-size optical touch modules after splicing can solve the problems of non-uniform large-area grating, affecting coupling efficiency and high cost of large-size nickel plate template.

[0014] 2. In the utility model, the splicing end surface of the adjacent optical touch module is provided with an inclined surface, and a reflective layer is arranged on the inclined surface. The horizontally propagating waveguide light changes the propagation direction at the edge of the optical touch module, is reflected into the photodetector array located at the lower surface of the substrate and the joint gap, can completely receive the light signal emitted at the edge, can realize the splicing of optical touch modules of any area, and can effectively solve the problem of limited area of grating preparation in the prior art.

[0015] 3. The light touch screen is located below the glass-based Micro LED display screen in the utility model, since the pixel light emitting area of the Micro LED display is very small (less than 20um) compared with the pixel interval, a high duty cycle can be achieved, and the light transmittance of the panel is increased, therefore, the light touch screen is placed below the display layer, and the image display quality is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a sectional view of the large-size Micro LED interactive display device based on light touch.

[0017] Figure 2 It is a front view of the large-size Micro LED interactive display device based on light touch.

[0018] Figure 3 It is a working schematic diagram of the light touch screen after splicing. DETAILED DESCRIPTION

[0019] The specific embodiments of the large-size Micro LED interactive display device based on light touch provided by the utility model will be described in detail below with reference to the drawings.

[0020] As shown in Figure 1 and Figure 2 , the embodiment provides a large-size Micro LED interactive display device based on light touch, which comprises a glass-based Micro LED display screen, and a light touch screen composed of at least two small-size light touch modules is arranged below the glass-based Micro LED display screen.

[0021] The light touch module comprises a substrate and a periodic grating structure on the upper surface of the substrate; the periodic grating structure is a structure with concave-convex alternation formed on the upper surface of the substrate by shallow etching, and the substrate in the embodiment is a PC substrate, which can also be a back plate; a photodetector array for receiving light signals is arranged on the side of the light touch screen away from the glass-based Micro LED display screen, and the photodetector array is located at the joint of adjacent light touch modules to reduce the joint gap between the light touch modules; in the embodiment, the photodetector array is located on the lower surface of the PC substrate and is fixed on the substrate by heat adhesive, and the lower surface in the embodiment is the lower surface of the substrate compared with the upper surface of the substrate with the periodic grating structure; the position of the photodetector array in the embodiment is located at the joint of the lower surface of the substrate, which can help realize the splicing of light touch modules of any area and solve the problem of limited area of grating preparation.

[0022] In a preferred embodiment, the opposing ends of two adjacent photosensitive modules are configured as splicing ramps. In this embodiment, the splicing ramp is formed at the splicing section of the two opposing substrates. Since the substrate and the periodic grating structure also constitute a grating antenna, the splicing ramp can also be set at the edge of two adjacent spliced ​​grating antennas. The two splicing ramps form a V-shaped space. The horizontally propagating waveguide light changes its propagation direction at the splicing ramp. A reflective layer is provided on the splicing ramp of the photosensitive module. The reflective layer is a metal reflective layer, such as gold or silver. After the waveguide light is reflected by the metal reflective layer, it enters the photodetector array, is received, and converted into a corresponding current signal.

[0023] The working principle of this utility model:

[0024] like Figure 3 As shown, the vertically downward arrow represents the laser beam, thus depicting the modulation state of the laser beam within the system. In operation, the laser beam is directed towards the optical touch module, which also serves as a grating antenna. Due to the unique periodic grating structure of the optical touch module, it can effectively couple the incident laser energy and convert it into waveguide light that propagates in the horizontal and vertical directions within the optical touch module. The waveguide light is ultimately received by the photodetector array arranged on the bottom surface of the optical touch module and converted into a corresponding current signal.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A large-size Micro LED interactive display device based on phototouch control, comprising a glass-based Micro LED display screen, characterized in that: Below the glass-based Micro LED display (1) is a light touch screen composed of at least two small-sized light touch modules (2); a photodetector array (3) is set on the side of the light touch screen facing away from the glass-based Micro LED display (1), and the photodetector array (3) is located at the gap where adjacent light touch modules (2) are spliced.

2. The large-size Micro LED interactive display device based on phototouch control according to claim 1, characterized in that: The two adjacent light touch modules (2) are set at opposite ends as splicing slopes (4), and the two splicing slopes (4) form a V-shaped space.

3. A large-size Micro LED interactive display device based on phototouch control according to claim 2, characterized in that: A reflective layer (5) is provided on the splicing slope (4) of the light touch module (2), and the reflective layer (5) is a metal reflective layer.

4. A large-size Micro LED interactive display device based on phototouch control according to claim 1, characterized in that: The photosensitive module (2) includes a substrate (21) and a periodic grating structure (22) located on the upper surface of the substrate (21); the periodic grating structure (22) is a structure with alternating concave and convex shapes formed by shallow etching on the upper surface of the substrate (21).

5. A large-size Micro LED interactive display device based on phototouch control according to claim 4, characterized in that: The photodetector array (3) is located on the lower surface of the substrate (21) and is fixed to the substrate (21) by hot melt adhesive.

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