CN102707839B - A kind of display device - Google Patents

Abstract

The invention discloses a display device, which is used to solve the problem that non-contact handwriting and drawing functions cannot be realized through the display device. The display device includes: a first wireless interface unit for receiving screen camera signals in a wireless manner; a light spot position recognition unit for identifying the light spot positions generated by laser beams irradiating on the screen from the screen camera signals; and a canvas responsible for synthesizing light spot trajectories processing unit; a video signal processing unit that superimposes the canvas video signal and the video signal from the video signal source; a screen display unit connected to the video signal processing unit; wherein, one end of the light point position recognition unit is connected to the first wireless interface unit The other end is connected to the canvas processing unit; the other end of the canvas processing unit is connected to the video signal processing unit. The invention combines laser technology, short-distance wireless communication technology and image processing technology, so that users can perform operations such as writing and drawing on the screen through a remote controller.

Description

a display device

technical field

The invention relates to a display device, in particular to a display device with writing function.

Background technique

Existing display devices, such as LCD TVs, rear-projection TVs, computer monitors, etc., are usually mainly used to receive display signals and present colorful TV program content or digital video content for users. With the development of high-tech, network With the popularization of applications, more and more extended functions are integrated into display devices to meet people's increasingly rich demands. For example, touch screens are integrated in some display devices, and users can control displayed content with their fingers, such as turning pages and marking documents, which is suitable for small meeting occasions. For another example, users can run some application programs through host devices with data processing functions such as PCs and notebooks, provide input for the application programs through handwriting pads, mice, etc. Functions such as writing and drawing on the device.

However, the above-mentioned display devices capable of realizing writing and drawing functions are either costly, or require other processing equipment to complete corresponding functions, which is inconvenient to use.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a display device, which can realize non-contact handwriting and drawing functions through the display device.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A display device, the display device comprising:

A first wireless interface unit that receives screen camera signals wirelessly;

A spot position recognition unit that identifies the position of the laser spot on the screen from the screen camera signal;

Canvas processing unit responsible for synthesizing light point trajectories;

a video signal processing unit for superimposing the canvas video signal and the video signal from the video signal source;

A screen display unit connected to the video signal processing unit;

Wherein, one end of the light point position identification unit is connected to the first wireless interface unit, and the other end is connected to the canvas processing unit; the other end of the canvas processing unit is connected to the video signal processing unit.

Further, the light spot position identification unit includes:

A screen recognition unit that recognizes a video frame that includes a complete screen and laser spots, and is connected to the first wireless interface unit;

A correction unit for correcting the video frame is connected with the screen recognition unit;

The position identification unit for calculating the actual position of the laser light spot on the screen is connected with the correction unit and the canvas processing unit respectively.

Further, the canvas processing unit includes:

Trajectory storage unit;

A light spot track processing unit that synthesizes light spot track groups according to the position of the laser spot on the screen is connected with the track storage unit;

The canvas output unit for outputting light spot track groups on the memory canvas is connected with the track storage unit and the video signal processing unit respectively.

Further, the display device also includes a remote control module, and the remote control module includes:

The second wireless interface unit is wirelessly connected to the first wireless interface unit;

A laser emitting unit that emits a laser beam to the screen;

The switch button input unit for controlling the opening and closing of the laser emitting unit is connected with the laser emitting unit;

The camera unit for taking pictures of the screen is connected to the second wireless interface unit.

Further, the remote control module further includes: an erase key input unit that generates an erase signal, and is connected to the second wireless interface unit.

Further, the canvas processing unit further includes: an erasing unit for clearing the canvas in the memory and clearing the light point track group in the track storage unit, and the erasing unit is connected to the first wireless interface unit, the track storage unit and the canvas output unit respectively.

Further, the first wireless interface unit and the second wireless interface unit are Bluetooth interfaces or Wi-Fi wireless transmission protocol interfaces.

The display device provided by the present invention combines laser technology, short-distance wireless communication technology and image processing technology, so that users can mark video content on the screen through the remote control, and perform operations such as writing and drawing on the screen; using the present invention, Combining video-on-demand with time-shifting function, network TV with Internet function and future smart TV, more abundant applications can be developed to meet people's demand for interactivity.

Description of drawings

FIG. 1 is a schematic diagram of the composition and structure of a display device provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of functional modules of a display module in a display device provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the composition of the functional units of the light spot position recognition unit in the display module provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of the functional unit composition structure of the canvas processing unit in the display module provided by the embodiment of the present invention;

FIG. 5 is a schematic diagram of the unit function composition structure of the remote control module in the display device provided by the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

FIG. 1 is a schematic diagram of the composition and structure of the display device provided by the present invention. The display device includes two parts: a display module 100 and a remote control module 110. The display module 100 can be a TV, a computer monitor, a monitor, and the like. The basic function of the existing display module 100 is to receive the video signal from the video signal source, and then display it on the screen; the present invention expands the functions of the display module 100 and the remote control module 110, and adds a laser emitting unit 112 to the remote control module 110 and the camera unit 111, the laser beam 120 is emitted to the screen by the laser emitting unit 112; The signal is processed to obtain the trajectory information of the laser beam, and then the trajectory image of the laser beam is superimposed on the video signal of the video signal source, so as to realize functions such as writing and drawing on the screen.

2 is a schematic diagram of the functional modules of the display module in the display device provided by the present invention. The display module 100 includes: a first wireless interface unit 201, a light spot position identification unit 202, a canvas processing unit 203, a video signal processing unit 204, and a screen display Unit 205;

The first wireless interface unit 201 receives the screen camera signal transmitted wirelessly, and transmits the screen camera signal to the light point position identification unit 202 . Wherein, the screen camera signal includes light spots 130 generated by laser irradiation on the screen; the wireless method may adopt a wireless short-distance transmission protocol, such as Bluetooth, Wi-Fi, and the like.

The spot position identification unit 202 identifies the position of the laser spot on the screen from the screen camera signal, and transmits the position information to the canvas processing unit 203 . During the identification process, it is necessary to identify the screen position and the laser spot position from the video frame, and if it cannot be identified, the corresponding video frame is discarded.

The canvas processing unit 203 synthesizes a light spot track formed by laser light spots on the canvas object in memory, and outputs the canvas video signal to the video signal processing unit 204 .

The video signal processing unit 204, on the one hand, decompresses and decodes the video signal from the video signal source; on the other hand, receives the canvas video signal sent by the canvas processing unit, and superimposes the canvas video signal and the video signal from the video signal source Together, the superimposed image signal is output to the screen display unit 205 .

The screen display unit 205 receives the image signal output by the video signal processing unit 204 and displays it on the screen.

FIG. 3 is a schematic diagram of the composition of the functional units of the light spot position identification unit 202 in the display module provided by the present invention. The light spot position identification unit 202 includes: a screen identification unit 301, a correction unit 302, and a position identification unit 303; wherein,

The screen recognition unit 301 receives the screen camera signal of the first wireless interface unit 201, identifies and extracts the video frame including the complete screen and the light spot generated by the laser beam in the screen camera signal, and transmits the extracted video frame to the correction unit 302 .

Here, to identify the position of the laser point, it is first necessary to identify the screen of the display module. Only after the position of the screen is recognized can the position of the light point be relatively determined. Therefore, it is necessary to first identify the screen and the light point from the original screen camera signal through the screen recognition unit. If the screen and blip are not recognized from the current video frame, the video frame is discarded. Among them, there are many kinds of algorithms for recognition, for example: firstly perform noise reduction processing on the video frame, and then use image matching technology to judge whether the video image contains a complete screen shape, and if so, further judge whether the screen contains highlights If the laser spot contains both the complete screen shape and the bright laser spot, the recognition is successful.

The correction unit 302 performs noise reduction and distortion correction processing on the video frame sent by the screen recognition unit, and then sends it to the position recognition unit 303 . Here, since the screen video captured by the camera unit 111 in the remote control module 110 may have different camera angles, the screen image captured at an oblique angle will be deformed compared with the screen image captured at the center position. Therefore, one of the correction unit 302 The important function is to correct the image, and correct the captured image by comparing it with the actual size of the built-in screen.

The position identification unit 303 calculates the actual position of the light spot on the screen according to the actual size of the screen after receiving the corrected image, and transmits the calculated position information to the canvas processing unit 203 .

Fig. 4 is a schematic diagram of the composition and structure of the functional units of the canvas processing unit 203 in the display module provided by the embodiment of the present invention, the canvas processing unit includes: a light point trajectory processing unit 401, a trajectory storage unit 402, and a canvas output unit 403; wherein,

The light spot track processing unit 401 receives the position information of the light spot on the screen output by the light spot position identification unit 202, and stores the continuous light spot combined light spot track in the track storage unit 402;

track storage unit 402, storing all light spot track groups;

The canvas output unit 403 renders the light point trajectories in the trajectory storage unit 402 in groups on the internal canvas, and outputs the canvas video signal to the video signal processing unit 204 .

Here, the light spot track grouping refers to the collection of light spots generated during the operation of the laser emitting unit 112 of the remote control module 110 from emitting the laser beam, drawing a line on the screen to closing the laser beam, which is called a track grouping.

FIG. 5 is a schematic diagram of the unit function composition structure of the remote control module 110 in the display device provided by the embodiment of the present invention. The remote control module includes: a laser emitting unit 112, a camera unit 111, a second wireless interface unit 503, and a switch key input unit 504 ;in,

The switch button input unit 504 is used to control the opening and closing of the laser emitting unit 112. The laser emitting unit 112 emits a laser beam into the screen range of the display module 100. The camera unit 111 takes pictures of the screen of the display module and transmits the screen camera signal to The second wireless interface unit 503 , the second wireless interface unit 503 transmits the screen camera signal to the first wireless interface unit 201 .

Further, the remote control module also includes: an erase key input unit 505, the erase key input unit 505 outputs an erase signal, and the erase signal is transmitted to the first wireless interface unit 201 through the second wireless interface unit 503; correspondingly , the track storage unit 402 and the canvas output unit 403 in the canvas processing unit 203 are also used to receive the erasing signal transmitted by the first wireless interface unit 201, and after the first wireless interface unit 201 receives the erasing signal, it transmits the erasing signal For the track storage unit 402 and the canvas output unit 403 , for clearing the memory canvas and clearing the light point track grouping in the track storage unit 402 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (7)

1. A display device, characterized in that the display device comprises:

a first wireless interface unit for receiving screen camera signals in a wireless mode;

a spot position identifying unit that identifies the position of the laser spot on the screen from the screen image pickup signal;

the canvas processing unit is responsible for synthesizing the light spot tracks;

a video signal processing unit which superposes the canvas video signal and the video signal from the video signal source;

the screen display unit is connected with the video signal processing unit;

one end of the light spot position identification unit is connected with the first wireless interface unit, and the other end of the light spot position identification unit is connected with the canvas processing unit; the other end of the canvas processing unit is connected with the video signal processing unit;

the canvas processing unit is used for receiving the position information of the light spots on the screen output by the light spot position identification unit, grouping the continuous light spots into light spot tracks, rendering the light spot tracks on the internal memory canvas in groups, and outputting the canvas video signal to the video signal processing unit.

2. The display device according to claim 1, wherein the light spot position identifying unit includes:

the screen identification unit is used for identifying a video frame comprising a complete screen and a laser spot and is connected with the first wireless interface unit;

the correcting unit is used for correcting the video frame and is connected with the screen identifying unit;

and the position identification unit for calculating the actual position of the laser spot on the screen is respectively connected with the correction unit and the canvas processing unit.

3. The display device according to claim 2, wherein the canvas processing unit comprises:

a track storage unit;

the light spot track processing unit is connected with the track storage unit and synthesizes light spot track groups according to the position of the laser light spot on the screen;

and the canvas output unit for outputting the light spot track grouping on the internal storage canvas is respectively connected with the track storage unit and the video signal processing unit.

4. The display device of claim 1, further comprising a remote control module, the remote control module comprising:

the second wireless interface unit is connected with the first wireless interface unit in a wireless mode;

a laser emitting unit that emits a laser beam to a screen;

the switch key input unit is used for controlling the on and off of the laser emission unit and is connected with the laser emission unit;

and the camera shooting unit is used for shooting the screen and is connected with the second wireless interface unit.

5. The display device as claimed in claim 4, wherein the remote control module further comprises: and the erasing key input unit is used for generating an erasing signal and is connected with the second wireless interface unit.

6. The display device according to claim 1 or 5, wherein the canvas processing unit further comprises: and the erasing unit is respectively connected with the first wireless interface unit, the track storage unit and the canvas output unit.

7. The display device according to claim 4, wherein the first wireless interface unit and the second wireless interface unit are bluetooth interfaces or Wi-Fi wireless transmission protocol interfaces.