A ceiling-mounted display screen anti-pinch detection device

Abstract

This utility model discloses an anti-pinch detection device for a ceiling-mounted display screen. The ceiling-mounted display screen includes a storage base and a display screen, which are closable. The anti-pinch detection device includes alternating and staggered infrared light source modules and infrared detection modules. The infrared light source modules are disposed on the storage base or the display screen, and the infrared detection modules are disposed on the storage base or the display screen. The infrared light source modules emit infrared light into the closed path area between the display screen and the storage base, and the infrared detection modules receive the infrared light reflected back from the closed path area between the display screen and the storage base. This utility model forms a dense, interwoven infrared light curtain through the infrared light source modules and the infrared detection modules, eliminating detection blind spots and solving the problem of limited response coverage; it achieves non-contact detection, improves response speed, and effectively avoids pinching accidents.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment safety protection technology, specifically to a ceiling-mounted display screen anti-pinch detection device. Background Technology

[0002] With the widespread application of in-vehicle entertainment systems and smart interactive devices, ceiling-mounted displays are increasingly being used in automobiles, rail transit, and high-end commercial vehicles. To enhance user convenience, these devices typically use electric mechanisms for automatic opening and closing. However, during the closing process, if a user's fingers, clothing, or other foreign objects accidentally enter the closing path, it can easily cause pinching injuries, device jamming, or even mechanical damage, posing a safety hazard.

[0003] Currently, the common anti-pinch detection solutions mainly include the following:

[0004] 1. Detection scheme based on changes in motor parameters: This method identifies obstacles by detecting changes in motor torque or current when motion encounters resistance. However, this approach suffers from response lag, requiring the object to have already exerted significant resistance on the mechanical movement before a response is triggered. Furthermore, the significant differences in characteristics between different types of motors make it difficult to standardize detection thresholds, complicates system debugging, and can accelerate motor wear with prolonged use.

[0005] 2. Touch-sensing based solution: When a preset number of fingers touch the screen during the closing process of the ceiling-mounted screen, a stop and back button are triggered. Although this method has a fast response, its detection principle relies on the local sensing of the touch panel, which cannot cover the non-contact area of ​​the entire closing path of the screen. It cannot effectively identify foreign objects that do not directly touch the screen surface, and the anti-pinch range is limited.

[0006] 3. Visual Recognition-Based Solutions: These solutions use cameras combined with image recognition algorithms to detect foreign object intrusion. This type of method is costly, sensitive to ambient lighting conditions, and prone to detection gaps in camera blind spots or at specific occlusion angles, making reliability and stability difficult to guarantee. Furthermore, continuous image acquisition may compromise user privacy and places high demands on computing resources.

[0007] It is evident that existing anti-pinch detection solutions for ceiling-mounted displays suffer from problems such as slow response speed, large detection blind spots, high false positive rate, susceptibility to environmental interference, and privacy risks. Utility Model Content

[0008] To address some or all of the problems existing in the prior art, this utility model provides a ceiling-mounted display screen anti-pinch detection device. The ceiling-mounted display screen includes a controller, a storage base, and a display screen. The display screen and the storage base are closable. The controller can control the opening and closing movement of the display screen on the storage base. The anti-pinch detection device includes an alternatingly staggered infrared light source module and an infrared detection module. The infrared light source module is disposed on the storage base or the display screen, and the infrared detection module is disposed on the storage base or the display screen. The infrared light source module is used to emit infrared light into the closed path area between the display screen and the storage base, and the infrared detection module is used to receive the infrared light reflected back from the closed path area between the display screen and the storage base.

[0009] As a further improvement of this utility model, the infrared light source module includes multiple infrared LED beads or infrared emitting chips arranged at equal intervals.

[0010] As a further improvement of this utility model, it also includes a light filter component, which is connected to the infrared detection module and is disposed on the light incident path of the infrared detection module.

[0011] As a further improvement of this utility model, the infrared detection module is provided with a cylindrical lens, which is disposed between the infrared detection module and the filter assembly to expand the horizontal light-sensing angle of the infrared detection module.

[0012] As a further improvement of this utility model, the filter component is a filter film that only allows infrared light of a specific wavelength to pass through.

[0013] As a further improvement of this utility model, the infrared detection module is a linear array detector or a surface array detector.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model arranges the infrared light source module and infrared detection module in an alternating staggered distribution on the storage base or display screen, forming a dense, interwoven infrared light curtain across the entire closed path area between the display screen and the storage base. This layout ensures that no matter where or from what angle a foreign object enters the closed path, it will be captured by at least one infrared detection channel, completely eliminating detection blind spots and solving the problem of limited coverage of touch sensing solutions.

[0016] 2. This invention is based on the principle of active infrared detection. It determines in real time whether there is foreign object intrusion by analyzing the reflection of infrared light along a closed path. Once a foreign object enters the detection area, it can be detected immediately without waiting for it to make physical contact with the mechanical structure or create resistance to the motor. This achieves true non-contact detection, and the response speed is much faster than solutions based on changes in motor parameters, effectively preventing pinching accidents.

[0017] 3. By setting a filter film on the light-incident side of the infrared detection module, this utility model can effectively eliminate the interference of visible light and other stray infrared light in the environment, thus ensuring the stability of the system under complex lighting conditions. Attached Figure Description

[0018] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the infrared detection module in Embodiment 1 of this utility model;

[0021] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model. Detailed Implementation

[0023] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0024] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] Example 1:

[0027] like Figure 1-2 As shown, a ceiling-mounted display screen 200 anti-pinch detection device is provided. The ceiling-mounted display screen 200 includes a controller, a storage base 100 and a display screen 200. The display screen 200 is connected to the storage base 100 in an openable and closable manner through a structure such as a hinge or a slide rail. The controller can control the operation of actuators such as a drive motor, thereby driving the display screen 200 to open or close relative to the storage base 100.

[0028] The core of the anti-pinch detection device lies in the infrared detection system, which includes an infrared light source module 1 and an infrared detection module 2. Both the infrared light source module 1 and the infrared detection module 2 are mounted on the side edge of the storage base 100 facing the closed path. The infrared light source module 1 emits infrared light into the closed path area between the display screen 200 and the storage base 100, and the infrared detection module 2 receives the infrared light reflected back from the closed path area between the display screen 200 and the storage base 100.

[0029] The infrared light source module 1 and the infrared detection module 2 are arranged in an "alternating staggered distribution" manner, that is, one infrared light source module 1, then one infrared detection module 2, then another infrared light source module 1, and so on in a cyclical manner. This layout aims to form an effective infrared detection light curtain in front of the closed path of the display screen 200.

[0030] The infrared light source module 1 consists of multiple equally spaced infrared LED beads 11, preferably 3-5 infrared LED beads 11. These infrared LED beads 11 can emit infrared light of a specific wavelength and illuminate the closed path area between the display screen 200 and the storage base 100. In other embodiments, the infrared LED beads 11 can also be replaced with infrared emitting chips, and their working principle is the same as in this embodiment.

[0031] A cylindrical lens 3 and a filter film 4 are sequentially placed above the infrared detection module 2. The filter film 4 is positioned in the light path of the infrared detection module 2, allowing only infrared light of a specific wavelength to pass through. This filters out stray visible light and other interference sources, ensuring the stability of the system under complex lighting conditions. The cylindrical lens 3 expands the field of view of the infrared detection module 2 in the horizontal direction, improving the ability to detect signals reflected from foreign objects in oblique or edge areas. In other embodiments, the filter film 4 can be replaced with other filter structures.

[0032] In this embodiment, the infrared detection module 2 is a linear array infrared detector, which is used to capture the grayscale change information of near-infrared light in the closed path. This linear array infrared detector has high gain, wide dynamic range, and low noise characteristics, and can meet the monitoring needs of the ceiling-mounted screen during dynamic closing. In other embodiments, the infrared detection module 2 can also be a planar array infrared detector, and its working principle is the same as in this embodiment.

[0033] Working principle:

[0034] As the display screen 200 begins to close along the storage base 100, the infrared light source module 1 continuously emits infrared light into the closed path area of ​​the display screen 200. If there is no foreign object, the reflected light signal received by the infrared detection module 2 is weak and stable. If a foreign object (such as a finger) enters this area, the infrared light is reflected from the surface of the foreign object, causing a sharp increase in the light intensity received by the corresponding pixel of the infrared detection module 2, resulting in a higher grayscale value. Once the grayscale change of any pixel exceeds a threshold within a preset time, it is determined that a foreign object has intruded, and a signal is output to control the display screen 200 to stop moving and retract a certain distance, thereby preventing pinching injuries.

[0035] In addition to single-pixel abrupt change detection, other strategies can be employed. For example, when a foreign object slides in close to the storage base 100, it may block part of the light source, causing a decrease in the light intensity received by the detector in a local area. In this case, the controller will calculate the average grayscale value within a sliding window (such as 5 consecutive pixels). If the average value suddenly drops by more than a threshold within a unit of time, the anti-pinch action will also be triggered.

[0036] Example 2:

[0037] like Figure 3 As shown, in this embodiment, the infrared light source module 1 is mounted on the display screen 200, while the infrared detection module 2 is mounted on the storage base 100. The infrared light source module 1 emits light at a certain angle toward the storage base 100. The infrared detection module 2 receives the infrared light reflected back from the closed path region. Its detection principle and judgment strategy are the same as in Embodiment 1.

[0038] Example 3:

[0039] like Figure 4 As shown, in this embodiment, the infrared light source module 1 is mounted on the storage base 100, while the infrared detection module 2 is mounted on the display screen 200. Its detection principle and judgment strategy are the same as in Embodiment 1.

[0040] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A ceiling-mounted display screen anti-pinch detection device, the ceiling-mounted display screen including a controller, a storage base and a display screen, the display screen and the storage base being closable, the controller being able to control the opening and closing movement of the display screen on the storage base, characterized in that: The anti-pinch detection device includes an infrared light source module and an infrared detection module that are alternately and staggered. The infrared light source module is set on the storage base or the display screen, and the infrared detection module is set on the storage base or the display screen. The infrared light source module is used to emit infrared light into the closed path area between the display screen and the storage base, and the infrared detection module is used to receive the infrared light reflected back from the closed path area between the display screen and the storage base.

2. The anti-pinch detection device of claim 1, wherein: The infrared light source module includes multiple equally spaced infrared LED beads or infrared emitting chips.

3. The anti-pinch detection device of claim 1, wherein: It also includes a light filter component, which is connected to the infrared detection module and is disposed on the light incident path of the infrared detection module.

4. The anti-pinch detection device of claim 3, wherein: The infrared detection module is equipped with a cylindrical lens, which is positioned between the infrared detection module and the filter assembly to extend the horizontal light-sensing angle of the infrared detection module.

5. The anti-pinch detection device for ceiling-mounted displays according to claim 3, characterized in that: The filter component is a filter film that only allows infrared light of a specific wavelength to pass through.

6. The anti-pinch detection device for ceiling-mounted displays according to claim 1, characterized in that: The infrared detection module is a linear array detector or a surface array detector.

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