CN113031797A - Touch display device and touch detection method thereof - Google Patents
Touch display device and touch detection method thereof Download PDFInfo
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- CN113031797A CN113031797A CN201911253275.5A CN201911253275A CN113031797A CN 113031797 A CN113031797 A CN 113031797A CN 201911253275 A CN201911253275 A CN 201911253275A CN 113031797 A CN113031797 A CN 113031797A
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- 238000000034 method Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 10
- 239000004973 liquid crystal related substance Substances 0.000 description 6
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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Abstract
The invention discloses a touch display device and a touch detection method thereof. The controller sequentially controls the infrared assemblies to emit and receive infrared light when a touch object contacts the display panel; determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting infrared light and the infrared light receiving time; and calculating the touch position of the touch object according to the distance between the at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies. Therefore, the touch display device provided by the embodiment of the invention can realize the touch detection function only by arranging the infrared component on one side edge of the display panel. Compared with the scheme that infrared elements are required to be arranged on all the side edges of the display panel in the prior art, the cost can be effectively reduced, and the whole weight of the touch display device is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch display device and a touch detection method thereof.
Background
The touch screen, also known as a touch screen or a touch display device, is used as a display device with a touch function, gives multimedia a brand-new appearance, and is widely applied to the fields of inquiry of public information, industrial control, military command, electronic games, multimedia teaching and the like.
Touch screens can be classified into infrared type, resistive type, surface acoustic wave type, and capacitive type touch screens according to different types of sensors. The infrared touch screen is basically structured in such a way that a plurality of infrared transmitting elements and infrared receiving elements are arranged around a touch detection area, and infrared light emitted by the infrared transmitting elements is received by the infrared receiving elements positioned opposite to each other; whether a touch event occurs and the position of the touch point may be determined according to whether the infrared light is blocked.
The existing infrared touch screen needs to be provided with infrared transmitting elements and infrared receiving elements on four sides, the touch areas of the existing infrared touch screen are limited in the rectangular plane formed by the four sides, and the thickness and the cost of the display equipment are increased by the four-side touch devices.
Disclosure of Invention
The invention provides a touch display device and a touch detection method thereof, which are used for realizing touch detection in a mode of arranging infrared assemblies on a single side.
In a first aspect, the present invention provides a touch display device, including:
a display panel for image display;
the infrared components are arranged along any one side edge of the display panel and are used for emitting infrared rays and receiving the infrared rays;
the controller is electrically connected with the infrared assemblies and used for sequentially controlling the infrared assemblies to emit and receive infrared light when a touch object contacts the display panel; determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting infrared light and the infrared component receiving infrared light; and calculating the touch position of the touch object according to the distance between at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies.
In a possible implementation manner, in the above apparatus provided by the present invention, the infrared component includes:
the infrared emission element is electrically connected with the controller and is used for emitting infrared rays under the control of the controller;
the infrared receiving element is electrically connected with the controller and is used for receiving the infrared light emitted by the infrared emitting element under the control of the controller;
the infrared transmitting element and the infrared receiving element in the same infrared assembly are arranged in a close mode.
In a possible implementation manner, in the above apparatus provided by the present invention, the infrared emitting elements and the infrared receiving elements are alternately arranged along a side edge of the display panel.
In one possible implementation manner, in the above apparatus provided by the present invention, the controller includes:
the timer is used for starting timing when the infrared emitting element starts to emit infrared light and finishing timing when the infrared receiving element receives the infrared light;
and the processor is electrically connected with the timer and is used for determining the distance between the touch object and the current infrared assembly according to the time difference between the infrared ray emitted by the infrared emitting element and the infrared ray received by the infrared receiving element.
In a possible implementation manner, in the above apparatus provided by the present invention, the touch display apparatus includes at least two sets of controllers; each group of controllers is electrically connected with the infrared assembly respectively;
and each controller controls the infrared assembly to emit infrared light and receive infrared light in turn, and calculates the distance between the infrared assembly and the touch object in turn.
In a second aspect, the present invention provides a touch detection method for a touch display device, where the touch display device includes:
a display panel for image display;
the infrared components are arranged along any one side edge of the display panel and are used for emitting infrared rays and receiving the infrared rays;
the detection method comprises the following steps:
when a touch object contacts the display panel, the infrared components are sequentially controlled to emit and receive infrared light;
determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting infrared light and the infrared component receiving infrared light;
and calculating the touch position of the touch object according to the distance between at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies.
In one possible implementation manner, in the foregoing method provided by the present invention, the infrared component includes: an infrared emitting element and an infrared receiving element;
the infrared emitting elements are sequentially controlled to emit infrared rays, and when one infrared emitting element emits infrared rays, other infrared emitting elements are in a closed state;
when the infrared transmitting element transmits infrared light, the infrared receiving elements in the same infrared assembly are controlled to receive the infrared light, and when one infrared receiving element receives the infrared light, other infrared receiving elements are in a closed state.
In one possible implementation, the present invention provides the above method, wherein the distance between the touch object and the infrared component is calculated by using the following formula:
R＝c×(t2-t1)/2；
wherein R represents the distance between the infrared component and the touch object, c represents the speed of light, t1Indicating the time, t, at which the infrared component emits infrared light2Indicating the time that the infrared light is received by the infrared assembly.
In a possible implementation manner, in the foregoing method provided by the present invention, the calculating a touch position of the touch object according to a distance between at least two infrared components and the touch object, positions of the two infrared components, and a distance between the two infrared components includes:
selecting two infrared assemblies with the shortest distance to the touch object from all the infrared assemblies as alternative infrared assemblies;
and calculating the touch position of the touch object according to the distance between the two selected infrared assemblies and the touch object, the positions of the two alternative infrared assemblies and the distance between the two alternative infrared assemblies.
In a possible implementation manner, in the method provided by the present invention, the touch position of the touch object is calculated by using the following formula:
x＝x1+R1×cos(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
y＝y1+R1×sin(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
wherein x represents the abscissa of the touch position, y represents the ordinate of the touch position, and R1Representing the distance, x, between the first alternative infrared component and the touching object1Abscissa, y, representing the first alternative infrared component1Denotes the ordinate, R, of the first alternative infrared component2Representing the distance, x, between the second alternative infrared component and the touching object2Abscissa, y, representing the second alternative infrared component2Indicating the ordinate of the second alternative infrared assembly and L indicating the distance between the first alternative infrared assembly and the second alternative infrared assembly.
The invention has the following beneficial effects:
the touch display device provided by the invention comprises: the display device comprises a display panel, an infrared assembly positioned on one side edge of the display panel and a controller electrically connected with the infrared assembly. Infrared light emitted by the infrared assembly is reflected by the touch object after being incident to the touch object, and the reflected infrared light is detected by the infrared assembly. The controller can calculate the optical path from the outgoing light to the returning light by timing the time difference between the infrared light emitted by the infrared component and the infrared light received by the infrared component according to the light speed and the time difference, so that the distance between the touch object and the infrared component can be calculated. And the position of each infrared component on the display panel is fixed, namely the coordinates of the infrared component in the coordinate system of the plane of the display panel are known. Then, a triangle can be constructed according to the distance between the touch object and the two infrared assemblies and the distance between the two infrared assemblies, and the position of the touch object, that is, the coordinates of the touch object in the plane of the display panel can be calculated according to the relationship between the sides and the angles of the triangle. Therefore, the touch display device provided by the embodiment of the invention can realize the touch detection function only by arranging the infrared component on one side edge of the display panel. Compared with the scheme that infrared elements are required to be arranged on all the side edges of the display panel in the prior art, the cost can be effectively reduced, and the whole weight of the touch display device is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a touch display device according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a ranging method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an exit angle of an infrared emitting element according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of touch location provided by an embodiment of the present invention;
fig. 6 is a flowchart of a touch detection method of a touch display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a touch display device, which can be an infrared touch display device, has the characteristics of low cost, high reliability and the like, and is particularly widely applied to large-size touch display equipment. For example, infrared touch can be used for education and conference display at present, and is particularly suitable for large-size display equipment. The touch display device provided by the embodiment of the invention can be a liquid crystal display, a liquid crystal television, an organic light emitting diode display, an organic light emitting diode television or electronic paper and other display equipment.
Fig. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present invention, and as shown in fig. 1, the touch display device according to the embodiment of the present invention includes: a display panel 100, an infrared assembly 200, and a controller 300.
A display panel 100 for displaying an image.
The display panel 100 may be a liquid crystal display panel, an organic light emitting diode display panel, or electronic paper. The display panel 100 has pixel units arranged in an array, each pixel unit can independently control display brightness, and image display of the display panel can be achieved by controlling the color and the display brightness of each pixel unit. The liquid crystal display panel needs to be matched with the backlight module for use, the backlight module provides backlight for the liquid crystal display panel, and the liquid crystal display panel and the pixel unit can realize brightness regulation and control by controlling the transmittance of the backlight. The organic light emitting diode display panel is a display panel in a self-luminous mode, and brightness control can be achieved by controlling driving current of pixel units of the organic light emitting diode display panel. In specific implementation, no matter which display panel is adopted, infrared touch can be realized, and the embodiment of the invention does not specifically limit the use type of the display panel.
The infrared module 200 is arranged along any one side of the display panel 100, and the infrared module 200 is used for emitting infrared light and receiving infrared light.
The infrared module 200 may have both functions of emitting infrared light and receiving infrared light. When performing touch detection, the infrared devices 200 may be sequentially turned on along the direction of the side where the infrared device 200 is located, and when one infrared device 200 is in a working state, other infrared devices may process a turned-off state, and one scanning cycle is completed when all the infrared devices 200 are sequentially turned on once. The infrared assembly 200 located on the side edge may be periodically scanned.
When the infrared light emitted by the infrared component 200 is incident to the touch object contacting the display panel, the touch object can perform diffuse reflection on the incident infrared light, so that the infrared component 200 can receive the infrared light reflected by the touch object. And then can calculate the distance between the touch object and the infrared component through the time difference of the infrared component transmitting infrared light and receiving infrared light.
And a controller 300 electrically connected to the infrared module 200.
The controller 300 is used for sequentially controlling the infrared assembly 200 to emit and receive infrared light when a touch object contacts the display panel; determining the distance between the infrared assembly 200 and the touch object according to the time difference between the infrared assembly 200 emitting the infrared light and receiving the infrared light; and calculating the touch position of the touch object according to the distance between the at least two infrared assemblies 200 and the touch object, the positions of the two infrared assemblies 200 and the distance between the two infrared assemblies 200.
The controller 300 is electrically connected to the infrared device 200, and the controller 300 may control the infrared device to emit infrared light and also control the infrared device to receive infrared light, that is, the controller 300 in the embodiment of the present invention may control the infrared device 200 to be turned on or off, and the controller 300 sequentially turns on the infrared device 200 to perform touch scanning.
The controller 300 not only can control the infrared assembly 200 to emit infrared light and detect infrared light, but also the controller 300 has a data processing function. As described above, infrared light emitted from the infrared module 200 is reflected by the touch object after being incident on the touch object, and the reflected infrared light is detected by the infrared module 200. The controller may calculate the optical path from the outgoing light to the returning light by timing the time difference between the infrared light emitted from the infrared unit 200 and the infrared light received by the infrared unit 200, and thus may calculate the distance between the touch object and the infrared unit 200.
After the touch display device is shipped, the position of each infrared device 200 on the display panel 100 is fixed, that is, the coordinates of the infrared device 200 in the coordinate system of the plane of the display panel are fixed. Then, a triangle can be constructed according to the distance between the touch object and the two infrared assemblies and the distance between the two infrared assemblies, and the position of the touch object, that is, the coordinates of the touch object in the plane of the display panel can be calculated according to the relationship between the sides and the angles of the triangle.
Therefore, the touch display device provided by the embodiment of the invention can realize the touch detection function only by arranging the infrared component on one side edge of the display panel. Compared with the scheme that infrared elements are required to be arranged on all the side edges of the display panel in the prior art, the cost can be effectively reduced, and the whole weight of the touch display device is reduced.
Fig. 2 is a second schematic structural diagram of a touch display device according to an embodiment of the present invention, and as shown in fig. 2, an infrared device 200 includes: an infrared emitting element 21 and an infrared receiving element 22.
And an infrared emitting element 21 electrically connected to the controller 300, wherein the infrared emitting element 21 emits infrared light under the control of the controller 300.
In practical applications, the infrared emitting element 21 may be a light emitting device such as an infrared light emitting diode for emitting infrared light. The light emitted by the display panel is generally visible light, and the infrared light emitted by the infrared emitting element 21 is used for touch detection, so that the display and the touch are not affected by each other, the infrared light does not interfere a user to watch a display image of the display panel, and the visible light emitted by the display panel does not affect the infrared light detected by the infrared touch detection.
An infrared receiving element 22, and a controller 300, wherein the infrared receiving element 22 receives the infrared light emitted by the infrared emitting element 21 under the control of the controller 300.
In the embodiment of the present invention, the adjacent infrared transmitting element 21 and infrared receiving element 22 may be packaged as one assembly in pairs. In application, the infrared emitting element 21 and the infrared receiving element 22 in one infrared assembly are turned on simultaneously, and the infrared receiving element 22 is used for receiving infrared light emitted by the infrared emitting element 21 in the same infrared assembly.
Also, in the embodiment of the present invention, the infrared transmitting element 21 and the infrared receiving element 22 in the same infrared module 200 are disposed adjacent to each other.
The placement of the IR emitting and IR receiving elements 21 and 22 in proximity in one IR module 200 facilitates packaging of both elements. Meanwhile, the infrared module 200 works in sequence, when the infrared emitting element 21 and the infrared receiving element 22 in the infrared module 200 are close to each other, the emitting position and the receiving position of the infrared light can be regarded as the same point, and if the touch position of the touch object is simplified into one point, the calculation of the distance from the touch position to the infrared module position is facilitated.
In a specific implementation, the infrared emitting elements 21 and the infrared receiving elements 22 may be disposed at the side of the bottom of the display panel, and as shown in fig. 2, the infrared emitting elements 21 and the infrared receiving elements 22 may be alternately arranged along the side of the display panel 100. The infrared emitting elements 21 and the infrared receiving elements 22 are arranged at intervals, so that the position difference generated by each infrared emitting element 21/each infrared receiving element 22 can be kept consistent, and then data optimization calculation can be uniformly performed as required when subsequent data processing is performed.
Fig. 3 is a schematic diagram of a distance measurement according to an embodiment of the present invention, and as shown in fig. 3, the controller 300 includes: a timer 31 and a processor 32 electrically connected to each other. The processor 32 is electrically connected to the infrared emitting element 21 and the infrared receiving element 22, respectively. Wherein:
the timer 31 is configured to start timing when the infrared emitting element starts emitting the infrared light, and end timing when the infrared receiving element receives the infrared light.
The controller 300 of the embodiment of the present invention may be a processing chip, and may also have a timing function. A highly accurate timer 31 is provided in the controller 300, and starts timing when the infrared light is emitted from the infrared emitting element 21 and ends timing when the infrared receiving element 22 receives the infrared light, whereby the time taken for the infrared light to be emitted from the infrared emitting element, incident on the touch object, reflected by the touch object, and then reflected back to the infrared receiving element can be obtained.
And the processor 32 is electrically connected with the timer 31, and the processor 32 is used for determining the distance between the touch object and the current infrared assembly according to the time difference between the infrared ray emitted by the infrared emitting element and the infrared ray received by the infrared receiving element.
As shown in fig. 3, the infrared emitting element 21 emits infrared light, and the infrared light is incident on the touch object, and the reflected infrared light is incident on the infrared receiving element 22 by reflection of the touch object. The time from the emitting to the receiving of the infrared ray is multiplied by the speed of light, and the distance traveled by the infrared ray can be obtained. And the infrared emitting element 21 and the infrared receiving element 22 are close to each other, if the position where the infrared emitting element 21 emits the infrared light and the position where the infrared receiving element 22 receives the infrared light are regarded as the same position, the distance that the infrared light is emitted from the infrared emitting element 21 to the touch object is equal to the distance that the light is reflected from the touch object to the infrared receiving element 22 to receive the light, and the distance is also the distance between the infrared component 200 and the touch object, the distance traveled by the light calculated above is 2 times of the distance between the infrared component 200 and the touch object, and thus the distance between the infrared component 200 and the touch object can be calculated.
Figure 4 is a schematic diagram of the exit angle of the infrared emitting device according to the embodiment of the present invention,as shown in FIG. 4, the infrared emitting element 21 has a certain exit range, i.e., at an exit divergence angle
Infrared rays are emitted from the inner part. In an implementation, the divergence angle of the infrared emitting element 21 may reach 120 degrees, so that when any one of the infrared assemblies 200 is turned on, it is possible to make infrared light incident on a touch object and receive the infrared light reflected by the touch object. In another practical way, the divergence angle of the infrared light emitted by the infrared emitting element 21 can be as small as possible, and in an ideal state, the infrared emitting element 21 emits light perpendicularly, so that only a touch object located right in front of the infrared component can receive the infrared light emitted by the infrared emitting element 21, the infrared receiving element 22 paired with the infrared emitting element can receive the infrared light reflected by the touch object, and then the position of the touch point can be directly determined by calculating the distance between the infrared component and the touch object.
Fig. 5 is a schematic diagram of touch positioning according to an embodiment of the present invention, as shown in fig. 5, the controller 300 sequentially controls the infrared module 200 to be turned on, the infrared emitting element and the infrared receiving element in the turned-on infrared module 200 are turned on simultaneously, timing is started when the infrared module 200 starts emitting infrared light, the infrared light may be incident on a touch object, and diffuse reflection occurs on the surface of the touch object, wherein a part of the light may be reflected back to the infrared module 200 by the reflection of the touch object. Then, in the process from when the infrared module 200 emits the infrared light to when the infrared module 200 receives the reflected infrared light, the infrared light is emitted from the infrared module 200 to the touch object and reflected by the touch object to return to the infrared module 200, and thus the distance between the infrared module 200 and the touch object multiplied by 2 is the distance the infrared light travels from when the infrared module emits to when the infrared module receives the infrared light. Therefore, the distance between the infrared device 200 and the touch object can be calculated according to the following formula:
R＝c×(t2-t1)/2；
wherein R represents the distance between the infrared component and the touch objectOff, c denotes the speed of light, t1Indicating the time, t, at which the infrared component emits infrared light2Indicating the time that the infrared light is received by the infrared assembly.
The controller 300 may obtain the distance between the infrared module 200 and the touch object by controlling one infrared module 200 to be turned on each time. Then after one scan cycle is complete, the controller may select two infrared components, such as the first infrared component Q in fig. 5, from all the data1And a second infrared component Q2A first infrared component Q1The distance between the touch object P and the touch object P is taken as the first side of the triangle, and the second infrared component Q2The distance between the touch object P and the first infrared component Q is taken as the second side of the triangle1And a second infrared component Q2The distance between them is taken as the third side of the triangle, building up the triangle as shown in fig. 5.
First infrared component Q1And a second infrared component Q2Has known coordinates, and the first infrared component Q1Distance to touch object P and second infrared component Q2If the distance to the touch object is calculated through the above steps, the coordinate of the touch point generated by the touch object is P (x, y), and the coordinate of the first infrared component is Q1(x1,y1) And the second infrared component has the coordinate of Q2 (x)2,y2) From the three sides of the triangle, the following relationships can be obtained:
(x1-x)2+(y1-y)2＝(R1)2；
(x2-x)2+(y2-y)2＝(R2)2；
the calculation can obtain:
x＝x1+R1×cos(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
y＝y1+R1×sin(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
wherein x represents the abscissa of the touch position, y represents the ordinate of the touch position, and R1Representing the distance, x, between the first alternative infrared component and the touching object1Abscissa, y, representing the first alternative infrared component1Denotes the ordinate, R, of the first alternative infrared component2Representing the distance, x, between the second alternative infrared component and the touching object2Abscissa, y, representing the second alternative infrared component2Indicating the ordinate of the second alternative infrared assembly and L indicating the distance between the first alternative infrared assembly and the second alternative infrared assembly.
Thus, the position of the touch point P (x, y) generated by the touch object can be obtained. According to the embodiment of the invention, the infrared component is arranged on one side edge of the display panel, and the touch point can be positioned by matching with the algorithm, so that the production cost is reduced, and the whole weight of the touch display device is reduced.
In a specific implementation, the controller 300 may be a Time Of Flight (TOF) chip. The touch display device provided by the embodiment of the invention can comprise at least two groups of controllers, and each group of controllers is respectively and electrically connected with the infrared component. Each controller may alternately control the infrared module 200 to emit infrared light and receive infrared light during the application process, and alternately calculate the distance between the controlled infrared module and the touch object.
More than two groups of controllers are adopted to drive the infrared assemblies in turn, so that the touch scanning efficiency can be improved. The distance between the infrared component and the touch object needs to be calculated according to the flight time of the infrared light after the controller drives the infrared component to emit the infrared light and receive the light, the data processing process also needs to occupy a part of time, and when more than two controllers are adopted for driving in turn, in the calculating process of one controller, the other controllers drive the infrared component and execute the operation step at the same time, so that the scanning program of each infrared component in the scanning period is faster, and the scanning efficiency can be improved.
Based on the same inventive concept, the embodiment of the invention also provides a touch detection method of the touch display device, and the touch detection method can be used for positioning the position of a touch point generated when a touch object contacts the display panel. The touch display device may be the structure of the touch display device shown in fig. 2, and includes a display panel 100 for displaying images; and infrared elements 200 arranged along the display panel 100 along any one side of the display panel 100, the infrared elements 200 for emitting infrared light and receiving infrared light.
Fig. 6 is a flowchart of a touch detection method of a touch display device according to an embodiment of the present invention, and as shown in fig. 6, the touch detection method according to the embodiment of the present invention may include:
s10, when the touch object contacts the display panel, the infrared components are sequentially controlled to emit and receive infrared light;
s20, determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting the infrared light and the infrared light receiving;
and S30, calculating the touch position of the touch object according to the distance between the at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies.
As shown in fig. 1 and 2, infrared light emitted by the infrared assembly 200 is reflected by a touch object after being incident on the touch object, and the reflected infrared light is detected by the infrared assembly 200. The controller may calculate the optical path from the outgoing light to the returning light by timing the time difference between the infrared light emitted from the infrared unit 200 and the infrared light received by the infrared unit 200, and thus may calculate the distance between the touch object and the infrared unit 200.
And the position of each infrared assembly 200 on the display panel 100 is fixed, i.e. the coordinates of the infrared assembly 200 in the coordinate system of the plane of the display panel are known. Then, a triangle can be constructed according to the distance between the touch object and the two infrared assemblies and the distance between the two infrared assemblies, and the position of the touch object, that is, the coordinates of the touch object in the plane of the display panel can be calculated according to the relationship between the sides and the angles of the triangle.
Therefore, the touch display device provided by the embodiment of the invention can realize the touch detection function only by arranging the infrared component on one side edge of the display panel. Compared with the scheme that infrared elements are required to be arranged on all the side edges of the display panel in the prior art, the cost can be effectively reduced, and the whole weight of the touch display device is reduced.
In particular implementations, the infrared assembly includes: an infrared emitting element and an infrared receiving element; the step S10 may specifically include:
the infrared emitting elements are sequentially controlled to emit infrared rays, and when one infrared emitting element emits infrared rays, other infrared emitting elements are in a closed state;
when the infrared transmitting element transmits infrared light, the infrared receiving elements in the same infrared assembly are controlled to receive the infrared light, and when one infrared receiving element receives the infrared light, other infrared receiving elements are in a closed state.
In the embodiment of the invention, the infrared transmitting element and the infrared receiving element in the infrared assembly are arranged close to each other, so that the position of the infrared transmitting element for transmitting infrared light and the position of the infrared receiving element for receiving infrared light can be regarded as the same position. In addition, each infrared assembly in the embodiment of the invention is driven independently, namely when one infrared assembly is in a working state, other infrared assemblies are in a closing state, by adopting the driving mode, a path of infrared light emitted by the infrared assembly to a touch object and a path of light reflected by the touch object to the infrared assembly can be regarded as a round-trip path, and the distance between the two paths is equal to the distance between the infrared assembly and the touch object. Therefore, the distance between the infrared assembly in the opening state and the touch object can be calculated by utilizing the TOF ranging principle.
In particular implementations, the distance between the touch object and the infrared component can be calculated using the following formula:
R＝c×(t2-t1)/2；
wherein R represents the distance between the infrared component and the touch object, c represents the speed of light, t1Indicating the time, t, at which the infrared component emits infrared light2Indicating the time that the infrared light is received by the infrared assembly.
After one scanning cycle is finished, distance values between the plurality of infrared assemblies and the touch object may be obtained, and the step S30 may specifically include:
selecting two infrared assemblies with the shortest distance to the touch object from all the infrared assemblies as alternative infrared assemblies;
and calculating the touch position of the touch object according to the distance between the two selected infrared assemblies and the touch object, the positions of the two alternative infrared assemblies and the distance between the two alternative infrared assemblies.
The embodiment of the invention adopts two infrared assemblies closest to the touch object as alternative infrared assemblies to participate in the positioning calculation of the touch object. As shown in fig. 5, after the distance between the infrared device 200 and the touch object is determined, that is, after the distance between the infrared device 200 and the touch object is determined, the position on the arc with the determined distance as the radius may be the touch position generated by the touch object, and therefore, the touch position of the touch object may be determined by using the distances between at least two infrared devices 200 and the touch object. When the two alternative infrared assemblies are selected as the two infrared assemblies closest to the touch object, the two alternative infrared assemblies can be protected from being used as circle centers, an intersection point is certainly formed in the circular arcs drawn by the two alternative infrared assemblies respectively, and the intersection point is the touch position of the touch object.
The position of the touch object is calculated based on the infrared assemblies which are close to the touch object, the method can also be applied to an application scene of multi-point touch, each outer touch point is positioned by adopting the coordinates of the two infrared assemblies which are closest to the outer touch point and the distance between the outer touch point and the touch point, and the situation that the touch point which is far away is shielded by the touch point which is near the outer touch point and cannot be detected during multi-point touch can be avoided.
After determining the triangle that calculates the touch point location, the touch location of the touch object may be calculated using the following formula:
x＝x1+R1×cos(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
y＝y1+R1×sin(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
wherein x represents the abscissa of the touch position, y represents the ordinate of the touch position, and R1Representing the distance, x, between the first alternative infrared component and the touching object1Abscissa, y, representing the first alternative infrared component1Denotes the ordinate, R, of the first alternative infrared component2Representing the distance, x, between the second alternative infrared component and the touching object2Abscissa, y, representing the second alternative infrared component2Indicating the ordinate of the second alternative infrared assembly and L indicating the distance between the first alternative infrared assembly and the second alternative infrared assembly.
The derivation of the above calculation formula can refer to fig. 5 and the above principle description part, and is not described herein again.
The touch display device provided by the embodiment of the invention comprises: the display device comprises a display panel, an infrared assembly positioned on one side edge of the display panel and a controller electrically connected with the infrared assembly. Infrared light emitted by the infrared assembly is reflected by the touch object after being incident to the touch object, and the reflected infrared light is detected by the infrared assembly. The controller can calculate the optical path from the outgoing light to the returning light by timing the time difference between the infrared light emitted by the infrared component and the infrared light received by the infrared component according to the light speed and the time difference, so that the distance between the touch object and the infrared component can be calculated. And the position of each infrared component on the display panel is fixed, namely the coordinates of the infrared component in the coordinate system of the plane of the display panel are known. Then, a triangle can be constructed according to the distance between the touch object and the two infrared assemblies and the distance between the two infrared assemblies, and the position of the touch object, that is, the coordinates of the touch object in the plane of the display panel can be calculated according to the relationship between the sides and the angles of the triangle. Therefore, the touch display device provided by the embodiment of the invention can realize the touch detection function only by arranging the infrared component on one side edge of the display panel. Compared with the scheme that infrared elements are required to be arranged on all the side edges of the display panel in the prior art, the cost can be effectively reduced, and the whole weight of the touch display device is reduced.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A touch display device, comprising:
a display panel for image display;
the infrared components are arranged along any one side edge of the display panel and are used for emitting infrared rays and receiving the infrared rays;
the controller is electrically connected with the infrared assemblies and used for sequentially controlling the infrared assemblies to emit and receive infrared light when a touch object contacts the display panel; determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting infrared light and the infrared component receiving infrared light; and calculating the touch position of the touch object according to the distance between at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies.
2. The apparatus of claim 1, wherein the infrared component comprises:
the infrared emission element is electrically connected with the controller and is used for emitting infrared rays under the control of the controller;
the infrared receiving element is electrically connected with the controller and is used for receiving the infrared light emitted by the infrared emitting element under the control of the controller;
the infrared transmitting element and the infrared receiving element in the same infrared assembly are arranged in a close mode.
3. The apparatus of claim 2, wherein the infrared emitting elements and the infrared receiving elements are alternately arranged along a side of the display panel.
4. The apparatus of claim 2, wherein the controller comprises:
the timer is used for starting timing when the infrared emitting element starts to emit infrared light and finishing timing when the infrared receiving element receives the infrared light;
and the processor is electrically connected with the timer and is used for determining the distance between the touch object and the current infrared assembly according to the time difference between the infrared ray emitted by the infrared emitting element and the infrared ray received by the infrared receiving element.
5. The device of claim 1, wherein the touch display device comprises at least two sets of controllers; each group of controllers is electrically connected with the infrared assembly respectively;
and each controller controls the infrared assembly to emit infrared light and receive infrared light in turn, and calculates the distance between the infrared assembly and the touch object in turn.
6. A touch detection method of a touch display device is characterized in that the touch display device comprises:
a display panel for image display;
the infrared components are arranged along any one side edge of the display panel and are used for emitting infrared rays and receiving the infrared rays;
the detection method comprises the following steps:
when a touch object contacts the display panel, the infrared components are sequentially controlled to emit and receive infrared light;
determining the distance between the infrared component and the touch object according to the time difference between the infrared component emitting infrared light and the infrared component receiving infrared light;
and calculating the touch position of the touch object according to the distance between at least two infrared assemblies and the touch object, the positions of the two infrared assemblies and the distance between the two infrared assemblies.
7. The method of claim 6, wherein the infrared component comprises: an infrared emitting element and an infrared receiving element;
the infrared emitting elements are sequentially controlled to emit infrared rays, and when one infrared emitting element emits infrared rays, other infrared emitting elements are in a closed state;
when the infrared transmitting element transmits infrared light, the infrared receiving elements in the same infrared assembly are controlled to receive the infrared light, and when one infrared receiving element receives the infrared light, other infrared receiving elements are in a closed state.
8. The method of claim 6, wherein the distance between the touch object and the infrared component is calculated using the following formula:
R＝c×(t2-t1)/2；
wherein R represents the distance between the infrared component and the touch object, c represents the speed of light, t1Indicating the time, t, at which the infrared component emits infrared light2Indicating the time that the infrared light is received by the infrared assembly.
9. The method of claim 6, wherein calculating the touch location of the touch object based on the distance between at least two infrared components and the touch object, the locations of two infrared components, and the distance between two infrared components comprises:
selecting two infrared assemblies with the shortest distance to the touch object from all the infrared assemblies as alternative infrared assemblies;
and calculating the touch position of the touch object according to the distance between the two selected infrared assemblies and the touch object, the positions of the two alternative infrared assemblies and the distance between the two alternative infrared assemblies.
10. The method of claim 9, wherein the touch location of the touching object is calculated using the following formula:
x＝x1+R1×cos(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
y＝y1+R1×sin(tan-1((y2-y1)/(x2-x1))–cos-1((R1 2+L2-R2 2)/2R1L))；
wherein x represents the abscissa of the touch position, y represents the ordinate of the touch position, and R1Representing the distance, x, between the first alternative infrared component and the touching object1Representing a first alternative infrared groupAbscissa, y, of the piece1Denotes the ordinate, R, of the first alternative infrared component2Representing the distance, x, between the second alternative infrared component and the touching object2Abscissa, y, representing the second alternative infrared component2Indicating the ordinate of the second alternative infrared assembly and L indicating the distance between the first alternative infrared assembly and the second alternative infrared assembly.
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