Patent ID: 12189904

DETAILED DESCRIPTION

In order to make objectives, technical solutions and advantages of the present disclosure more clear, the present disclosure will be further described in detail below with reference to accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, but not all the embodiments. On the basis of the embodiments in the disclosure, all other embodiments obtained by those ordinarily skilled in the art without inventive efforts fall within the protection scope of the present disclosure.

Shapes and sizes of all parts in the accompanying drawings do not reflect the true scale, and only intend to illustrate the content of the present disclosure.

A display device provided by an embodiment of the disclosure, as shown inFIG.1AtoFIG.1D, includes a display module1and an infrared touch assembly2.

The infrared touch assembly2includes an infrared emitting frame21and an infrared receiving frame22, a plurality of infrared emitting units23are fixed in the infrared emitting frame21, and the infrared emitting units23are used for emitting infrared light; and a plurality of infrared receiving units24are fixed in the infrared receiving frame22, the infrared receiving units24are used for receiving infrared light, converting the received infrared light into a change of an electrical signal, such as change of a current I or a voltage U, and determining coordinates of a touch position after passing through a processor.

An orthographic projection of a light-emitting surface of the infrared emitting frame21in the display module1is located in an area outside a display area of the display module1. The light-emitting surface of the infrared emitting frame21refers to a plane area constituted by positions where each infrared emitting unit23emits the infrared light at one side of the display area. Specifically, the infrared emitting frame21may be located in a frame area and an area outside the frame of the display module1, which will not block the display area of the display module1and consequently affect normal display.

A distribution density of the infrared emitting units23is uneven in the infrared emitting frame21.

Specifically, in a large-sized display device, not all areas in the display area of the display module1are sensitive areas for a display operation. Therefore, for an area with a low frequency of a touch operation, it is not necessary to set too many infrared emitting units23and infrared receiving units24. But for an area where the touch operation may be frequent, for example, at least one or more application icons are displayed in this area, or a writing operation is required in this area, etc. . . . more infrared emitting units23and more infrared receiving units24may be set correspondingly, so as to realize a higher touch sensitivity. Based on this, in the display device provided by embodiments of the disclosure, the infrared emitting units23in the infrared emitting frame21may be in an uneven distribution, such that a conventional touch operation realized, a cost of the infrared touch assembly is reduced, and a cost of the display device is accordingly reduced.

In some embodiments, in the above display device provided by embodiments of the disclosure, the display module I may be a liquid crystal display panel (LCD), may also be an organic light-emitting diode display panel (OLED), and may further be an electronic paper display panel, which is not limited.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.1A, the infrared touch assembly2may be disposed on a side of the display surface of the display module1, that is, the touch area formed by the infrared light emitted by the infrared emitting units23is applied to the display surface of the display module1. Specifically, as shown inFIG.1A, the infrared emitting units23and the infrared receiving units24may be disposed on a side of a protective cover plate3facing away from the display module1, the infrared emitting units23emit the infrared light in a direction pointing to the corresponding infrared receiving units24, and a user realizes the touch operation on an outer surface of the protective cover plate3.

Or, in some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.1B, the infrared touch assembly2may also be disposed on the side of the display module I facing away from the display surface, that is, the infrared light emitted by the infrared emitting units23is transmitted to the display surface of the display module1through reflection to form the touch area.

Or, in some embodiments, in the above display device provided by embodiments of the disclosure, the infrared touch assembly2may be partially disposed on the display surface of the display module1, and the other part is disposed on the side of the display module I facing away from the display surface. For example, as shown inFIG.1C, the infrared emitting frame21in the infrared touch assembly2may be disposed on the display surface of the display module1, and the infrared receiving frame22in the infrared touch assembly2may be positioned on the side of the display module1facing away from the display surface. That is, the infrared light emitted by the infrared emitting units23is transmitted to a back surface of the display module1through reflection to be received by the infrared receiving units24. Also as shown inFIG.1D, the infrared emitting frame21in the infrared touch assembly2may be disposed on the side of the display module I facing away from the display surface, and the infrared receiving frame22in the infrared touch assembly2may be disposed on the display surface of the display module1. That is, the infrared light emitted by the infrared emitting units23is transmitted to the display surface of the display module1through reflection to be received by the infrared receiving units24. In some embodiments, in the above display device provided by embodiments of the disclosure, the display surface of the display module I is generally in a shape of a rectangle with an edge extending in a first direction and an edge extending in a second direction, and the first direction and the second direction are perpendicular to each other. The following descriptions are given by taking the first direction as a long side direction of the rectangle and the second direction as a short side direction of the rectangle as an example.

As shown inFIG.2, the infrared emitting frame21may include: a first infrared emitting frame21aextending in the first direction. Specifically, a light bar extending in the first direction may be used as the first infrared emitting frame21a, and the plurality of infrared emitting units23(i.e., infrared lamp beads) on a PCB substrate form the light bar.

As shown inFIG.2, the infrared receiving frame22may include: a first infrared receiving frame22aarranged opposite to the first infrared emitting frame21aand extending in the first direction.

Specifically, a distribution of the infrared emitting units23is uneven in the first infrared emitting frame21a, and a distribution of the corresponding infrared receiving units24is also uneven in the first infrared receiving frame22a. For the convenience of subsequent description, only the infrared emitting units23are described. Specifically, the uneven distribution of the infrared emitting units23in the first infrared emitting frame21aspecifically refers to that all the infrared emitting units23are sequentially arranged in the first infrared emitting frame21aat intervals in the first direction, and an arrangement spacing between the infrared emitting units23is uneven.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.3, the first infrared emitting frame21aincludes a first area A and a second area B, and a distribution density of the infrared emitting units23in the first area A is greater than a distribution density of the infrared emitting units23in the second area B. It may be considered that a dense area where the infrared emitting units23are arranged in the first infrared emitting frame21ais the first area A. The density of the infrared emitting units23in the first area A is greater than the density of the infrared emitting units23on the two adjacent sides. It may also be considered that a spacing between the adjacent infrared emitting units23in the first area A is smaller than a spacing between the infrared emitting units23in the second area B.FIG.3does not show all the infrared emitting units23, but only shows three segments of infrared emitting unit sets, and each set includes a plurality of infrared emitting units23.

In some embodiments, in the above display device provided by embodiments of the disclosure, the first area A may be a middle area of the first infrared emitting frame21a, and the first area A may also be an end edge area of the first infrared emitting frame21a. The second area B is an area adjacent to the first area A in the first infrared emitting frame21a.FIG.3shows a situation that the first area A is in the middle area and the two-end edge areas of the first infrared emitting frame21a, and the second area B is an area between the middle area and the two-end edge areas. Reducing the distribution density of the infrared emitting units23in the second area B, that is, reducing the quantity of the infrared emitting units23in the second area B, can save the cost.

In some embodiments, in the above display device provided by embodiments of the disclosure, the infrared emitting units23in the first area A may be arranged at equal or unequal spacing. For example, at an edge of the first area A, the spacing gradually becomes large so as to match the spacing in the second area B. Similarly, the infrared emitting units23in the second area B may be arranged at equal or unequal spacing, for example, at the edge of the second area B, the spacing is gradually reduced so as to match the spacing in the first area A.

Specifically, in the above display device provided by embodiments of the disclosure, a diameter of one infrared emitting unit23is generally 0.4 mm-0.6 mm, and a spacing between the two adjacent infrared emitting units is 1 mm-16 mm. Specifically, a spacing between the two adjacent infrared emitting units23in the first area A is generally 2 mm-7 mm, and a spacing between the two adjacent infrared emitting units23in the second area B is generally 5 mm-16 mm. It is worth noting that a cross-sectional shape of lamp beads of one infrared emitting unit23may be in a shape of a circle or a rectangle. When it is in the shape of the rectangle, the diameter of the infrared emitting units refers to a side length of the rectangle.

Preferably, in the above display device provided by embodiments of the disclosure, the first area A is only the middle area of the first infrared emitting frame21a. Since relatively frequent touch is generally performed in the display area corresponding to the middle area of the first infrared emitting frame21a, setting a high density of the infrared emitting units23in the middle area may improve touch precision to a certain extent.

The following describes a position of the middle area in the first infrared emitting frame21aby using specific parameters.

All the N infrared emitting units23in the first infrared emitting frame21aare numbered from 1 to N in a sequence from left to right.

If the infrared emitting units23are arranged at equal intervals in the middle area, the n-m infrared emitting units23in the middle area are numbered as m to n from left to right, here N>n>m. The infrared emitting unit23numbered m serves as a left side edge of the middle area, and a distance between the infrared emitting unit23numbered m and the infrared emitting unit23numbered 1 (i.e., the left side edge of the first infrared emitting frame23a) is a first distance. The infrared emitting unit23numbered n serves as a right side edge of the middle area, and a distance between the infrared emitting unit23numbered n and the infrared emitting unit23numbered N (i.e., the right side edge of the first infrared emitting frame23a) is a second distance. A distance between the infrared emitting unit23numbered 1 and the infrared emitting unit23numbered N (i.e., a length of the first infrared emitting frame23a) is a third distance. A ratio between the first distance and the third distance is defined as a first ratio, the first ratio is greater than 0.35 and less than 0.5, a ratio between the second distance and the third distance is defined as a second ratio, and the second ratio is greater than 0.35 and less than 0.5.

If the infrared emitting units23in the middle area are arranged at unequal intervals, a distance between a center point between the two infrared emitting units23with a minimum spacing in the middle area and the infrared emitting unit23numbered 1 (i.e., the left side edge of the first infrared emitting frame23a) is a fourth distance. A ratio between the fourth distance and the third distance is defined as a third ratio, and the third ratio is greater than 0.38 and less than 0.62.

It is worth noting that the spacing and the distance mentioned in the disclosure refer to a distance between the center points of the two infrared emitting units23.

Specifically, when the display module I executes a display function, at least one first icon210is displayed on at least one user interface in the display area, and a preset program can be executed upon the first icon210being clicked by the user. For example, the first icon210may be an electronic whiteboard icon. When the user clicks the electronic whiteboard icon, the display module I starts an electronic whiteboard function, and the user may perform the writing operation on an electronic whiteboard interface. For another example, the first icon210may be a writing pen icon, an eraser icon, and a back icon on the electronic whiteboard interface. When the user clicks the icon, a writing pen function, an eraser function, and a back to previous function may be started correspondingly. For example, the first icon210may be a system setting icon, a Miracast icon, and the like, which is not limited.

In some embodiments, in the above display device provided by embodiments of the disclosure as shown inFIG.4A, an effective infrared light signal emitted by the infrared emitting units23in the first area A of the first infrared emitting frame21acreates a first touch area201aon a surface of the display module1. At least one first icon210is presented on at least one display interface the display module2in an area corresponding to the first touch area201a; and the at least one infrared emitting unit23is arranged within a range including an orthographic projection of the first icon210in a direction parallel to a side edge where the first area A is located.

Specifically, whether the first icon210is positioned upper or lower of the display interface are not specifically limited, and it may be located in the middle of the display interface, or may be positioned at the edge of the display interface. Since the first icon210is disposed in the area corresponding to the first touch area201a, an accuracy and sensitivity of the user's click on the first icon210can be improved, and thus the user experience can be improved. Meanwhile, in other areas, namely, the second area B, the density of the infrared emitting units23may be appropriately reduced, that is, the number of the infrared emitting units23may be reduced, thereby saving the cost.

FIG.4Aonly shows the embodiment of the infrared emitting units23arranged in the first infrared emitting frame21a, namely, in the first direction (horizontal). Further, in a preferred embodiment, based on a mechanism of infrared touch control, in order to realize an accurate point touch operation, the infrared touch assembly2may further include: an infrared emitting frame23and an infrared receiving frame24disposed oppositely and extend in the second direction. That is, the infrared emitting units23and the infrared receiving units24are disposed in the second direction (vertical) as well.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.4B, the infrared emitting frame21may further include: a second infrared emitting frame21bextending in the second direction. Correspondingly, the infrared receiving frame22may further include: a second infrared receiving frame22bdisposed opposite to the second infrared emitting frame21band extending in the second direction, that is, the infrared emitting units23and the infrared receiving units24are disposed in the second direction as well.

Similar to the first infrared emitting frame21a, the second infrared emitting frame21bmay include a first area A and a second area B, and a distribution density of the infrared emitting units23in the first area A is greater than a distribution density of the infrared emitting units23in the second area B. It may be considered that a dense area where the infrared emitting units23are arranged in the second infrared emitting frame21bis the first area A. The density of the infrared emitting units23in the first area A is greater than the density of the infrared emitting units23adjacent at its upper and lower sides. It may also be considered that a spacing between the adjacent infrared emitting units23in the first area A is smaller than a spacing between the adjacent infrared emitting units23in the second area B.FIG.4Bdoes not show all the infrared emitting units23, but only shows a set of a continuous segment of infrared emitting units23.

Similarly, the first area A may be a middle area of the second infrared emitting frame21b, and the first area A may also be an end edge area of the second infrared emitting frame21b. The second area B is an area adjacent to the first area A in the second infrared emitting frame21b.FIG.4Bshows a situation that the first area A is the middle area of the second infrared emitting frame21b, and the second area B is an area adjacent to the middle area. Reducing the distribution density of the infrared emitting units23in the second area B, that is, reducing the quantity of the infrared emitting units23in the second area B, can save the cost.

Similarly, the infrared emitting units23in the first area A of the second infrared emitting frame21bmay be arranged at equal or unequal spacing. For example, at an edge of the first area A, the spacing gradually becomes large so as to match the spacing in the second area B. Similarly, the infrared emitting units23in the second area B may be arranged at equal or unequal spacing, for example, at the edge of the second area B, the spacing is gradually reduced so as to match the spacing in the first area A. A spacing between the two adjacent infrared emitting units23in the first area A of the second infrared emitting frame21bis generally 2 mm-7 mm, and a spacing between the two adjacent infrared emitting units23in the second area B is generally 5 mm-16 mm.

Moreover, in the above display device provided by embodiments of the disclosure, the first area A is only the middle area of the second infrared emitting frame21b. Since relatively frequent touch is generally performed in the display area corresponding to the middle area of the second infrared emitting frame21b, setting a high density of the infrared emitting units23in the middle area may improve the touch control precision to a certain extent.

The manner in which specific parameters are used to describe the position of the middle area in the second infrared emitting frame21bis similar to that of the above first infrared emitting frame21a, which will not be described in detail here.

In some embodiments, as shown inFIG.4B, an effective infrared light signal emitted by the infrared emitting units23in the first area A of the second infrared emitting frame21bcreates a second touch area201bon the surface of the display module1. There is a touch overlapping area201cbetween the second touch area201band the first touch area201a, and the display module1displays the at least one first icon210in an area corresponding to the touch overlapping area201c; and the at least one infrared emitting unit23is disposed within a range including an orthographic projection of the first icon210in a direction parallel to a side edge where the first area A is located.

Specifically, there is the touch overlapping area201cbetween the first touch area201ain a horizontal direction and the second touch area201bin a vertical direction. Since the first icon210is disposed in an area corresponding to the touch overlapping area201c, an accuracy and sensitivity of the user's click on the first icon210can be improved, thereby improving the user experience.

Specifically, in the infrared touch assembly2, the infrared light emitted by each infrared emitting unit23for realizing the touch operation and the infrared light received by each infrared receiving unit24for the user to realize the touch operation have a certain coverage scope.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.2, the infrared emitting units23and the infrared receiving units24may be in one-to-one correspondence, and the effective infrared light signal emitted by one infrared emitting unit23is received by one infrared receiving unit24, so as to realize a touch control function. That is, according to an infrared touch control principle, the infrared emitting units23and the infrared receiving units24are in one-to-one correspondence in emission and reception of the effective infrared light signal, that is to say, as shown inFIG.2, the effective infrared light signal emitted by one infrared emitting unit23can only be received by one infrared receiving unit22. One or more pairs of infrared emitting units23and infrared receiving units24create a touch area201.

Specifically, the above implementation solution provided by embodiments of the disclosure is based on the mechanism of one-to-one correspondence between the infrared emitting units23and the infrared receiving units24, and the effective infrared light signal emitted by one infrared emitting unit23can be received by one infrared receiving unit24. An alternative to the infrared touch control mechanism is a one-to-many mechanism. That is, in some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.5, one infrared emitting unit23may correspond to the plurality of infrared receiving units24, and the infrared light emitted by one infrared emitting unit23may be simultaneously received by the plurality of corresponding infrared receiving units24, so as to realize the touch control function. That is, the effective infrared light signal emitted by one infrared emitting unit23may be received by the plurality of infrared receiving units24. Here, regardless of the mechanism, the above rules are still meet.

Specifically.FIG.5only shows a situation that the effective infrared light signal emitted by one infrared emitting unit23is received by the plurality of infrared receiving units24, but in an actual product, the effective infrared light signal emitted by each infrared emitting unit23can be received by the plurality of infrared receiving units24. Specifically.FIG.5only shows part of the infrared emitting units23and part of the infrared receiving units24arranged in the horizontal direction, namely: part of the infrared emitting units23arranged in the first infrared emitting frame21aand part of the infrared receiving units24arranged in the first infrared receiving frame22a. It should be noted that the actual product may further include more infrared emitting units23and part of the infrared receiving units24in the horizontal direction. Moreover, the infrared emitting units23and the infrared receiving units24may also be arranged in the vertical direction, that is, the infrared emitting units23are arranged in the second infrared emitting frame21band the infrared receiving units24are arranged in the second infrared receiving frame22b. Therefore, all the infrared emitting units23and the infrared receiving units24may create an optical network for touch control, as shown inFIG.6, so as to realize a multi-touch operation.

Compared with the one-to-one correspondence mechanism between the infrared emitting units23and the infrared receiving units24, the above one-to-many mechanism can create a dense optical network, thus reducing the quantity of the infrared emitting units23and the infrared receiving units24, thereby realizing an effect of reducing the product cost. However, the one-to-many mechanism also brings some defects, that is, a touch-insensitive area501is generated at an edge of the display device, which is introduced in detail below.

In a one-to-many touch control mode, each infrared emitting unit23has an effective signal emitting angle θ, and the effective signal emitting angle θ of one infrared emitting unit23refers to an included angle between an outermost detection beam emitted by the infrared emitting unit23and the normal. The effective signal emitting angle θ and an emitting angle of one infrared emitting unit23are not the same concept. For example, the emitting angle of one infrared emitting unit23is about 120 degrees, but the effective signal emitting angle θ is not that large. The emitting angle of the infrared emitting unit23gradually increases, and light intensity of the detection beam gradually decreases as well. With weakening of the light intensity, a large-angle area cannot be used for realizing infrared touch control due to a signal-to-noise ratio. Therefore, in a current touch control product, the effective signal emitting angle is generally controlled at a certain angle through timing or signal control. For example, in a one-to-seven infrared touch control mode, the effective infrared light signal emitted by one infrared emitting unit23can be received by the seven infrared receiving units24, and light beams received at the left-most and right-most sides are the outermost detection beams. Because the spacing between the infrared emitting units23is inconsistent, for the different infrared emitting units23, their effective signal emitting angles θ are not necessarily equal.

At present, the advanced infrared touch assembly2is generally multi-touch, so for detection of one touch point, in order to easily remove a ghost focus, at least three beams of light are generally required to pass through (the touch control point passed through the two beams of light is generally considered the ghost focus). For a display device with the infrared emitting units23in both horizontal and vertical directions, in order to ensure that the touch control function can be realized at the position of one point, the infrared emitting unit23in one direction provides at least one light beam, and the infrared emitting unit23in the other direction provides at least two light beams. Therefore, at the edge of the display device close to the infrared emitting units23and the infrared receiving units24, it is generally impossible to realize continuous precise touch control. The area needs to be subjected to touch control shield. The area has many infrared touch control blind spots, so it may be called a touch control insensitive area (corresponding to a fourth touch area402in the disclosure).

Based on this, specifically, the display module may include a display panel and a protective cover plate. Touch areas generated on a surface of the protective cover plate by effective infrared light signals emitted by all the infrared emitting units may be divided into a third touch area401and a fourth touch area402, and touch control precision of the third touch area401is higher than touch control precision of the fourth touch area402; and the third touch area401is located in a central area of the protective cover plate, and the fourth touch area402is located in at least one edge area of the protective cover plate.

A distance b between the infrared emitting units23and a boundary line separating the fourth touch area402and the third touch area401(it is worth noting that when the infrared emitting units23are on one side of the display surface as shown inFIG.1AandFIG.1C, it may be considered that the infrared emitting units23and a boundary line are on the same horizontal plane, and the distance b is a straight-line distance between the boundary line and the infrared emitting units23; and when the infrared emitting units23are on one side facing away from the display surface as shown inFIG.1BandFIG.1D, the distance b is a shortest distance from the infrared emitting units23to the boundary line through a broken line), as shown inFIG.7A, meets the following:
b≥(a*tan θ1*tan θ2)/(tan θ1+tan θ2).

As shown inFIG.7A, the plurality of infrared emitting units23disposed horizontally include two adjacent infrared emitting units231and232, and a spacing between the infrared emitting units231and232is a maximum spacing a among all the infrared emitting units23. For the infrared emitting unit231, an included angle between the outermost detection beam2310and the normal is an effective signal emitting angle θ1; and for the infrared emitting unit232, an included angle between the outermost detection beam2320and the normal is an effective signal emitting angle θ2.

Preferably, in order to further ensure the effect of multi-touch, the distance b between the infrared emitting units23and the boundary line separating the fourth touch area402and the third touch area401, as shown inFIG.7B, further needs to meet the following:
b≥(c*tan θ3*tan θ4)/(tan θ3+tan θ4).

As shown inFIG.7B, the plurality of infrared emitting units23disposed horizontally include three adjacent infrared emitting units233,234and235, a spacing between the infrared emitting units233and235is a maximum separation distance c among all the infrared emitting units23, and the separation distance is a distance between the two infrared emitting units separated by one infrared emitting unit. For the infrared emitting unit233, an included angle between the outermost detection beam2330) and the normal is an effective signal emitting angle θ3; and for the infrared emitting unit235, an included angle between the outermost detection beam2350) and the normal is an effective signal emitting angle θ4.

Specifically, the touch-insensitive area may be set as not for touch operation but only as display: or not for display, so the third touch area401may be at least partially located in the display area101of the display module1, that is, the third touch area401and the display area101overlap, and may completely overlap or partially overlap. The protective cover plate3is provided with a shielding layer in an area corresponding to the fourth touch area402, for example, a light shielding layer such as a black tape is used to shield the fourth touch area402. The light shielding layer will lead to a wider frame of the display device, which is very unfavorable for realizing a narrow bezel design. In the display device provided by embodiments of the disclosure, the following solutions are proposed to solve the problem.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.8A, touch areas formed on the surface of the display module1by effective infrared light signals emitted by all the infrared emitting units23are divided into the third touch area401and the fourth touch area402. As shown inFIG.1E, the third touch area401covers a central area of the display area101of the display module, and the fourth touch area402covers at least one edge area of the display area101of the display module1. Specifically, according to the above explanation of the mechanism of generating the touch control insensitive area501, it can be known that the infrared touch blind points will appear in an edge area where the infrared emitting units23and the infrared receiving units24are disposed. The edge areas of the display area101where the infrared emitting units23and the infrared emitting units24are arranged belong to the fourth touch area401. In a case that the infrared emitting units23are distributed in the first infrared emitting frame21aand the second infrared emitting frame21bat the same time, it may be considered that the fourth touch area402is formed around the third touch area401. It is worth noting that both the third touch area401and the fourth touch area402overlap with the display area101. As shown inFIG.8B, it may be considered that the third touch area401completely overlaps with the display area101, and the fourth touch area402partially overlaps with the display area101.

As shown in an enlarged view inFIG.8A, the display module1displays at least one second icon220on at least one display interface in the area corresponding to the fourth touch area401, and a display position of the second icon220corresponds to a position of the at least one infrared emitting unit23or infrared receiving unit24. Specifically, the second icon220may be, for example, a menu icon on a main interface of the electronic whiteboard, and may also be function icons such as a writing pen and an eraser on an operation interface of the electronic whiteboard.

Specifically, in response to a starting operation of the user, the display module may start some programs. For example, in a conference machine product, the user may click to start the electronic whiteboard function, and the user may write or draw on the writing interface of the electronic whiteboard. In the product, the writing interface of the electronic whiteboard is located in the third touch area401, so the user may write continuously and fluently in the writing interface. Some functional icons of the electronic whiteboard, such as at least one icon for a writing pen or an eraser, may be located in the fourth touch area402.

Specifically, setting the second icon220in the fourth touch area402can effectively reduce the bezel of the display device, which is beneficial to the realization of narrow-bezel products. For some large-sized display devices, the user only performs frequent touch operations in the third touch area401, which will not affect the operation experience of the user.

The following two solutions may be described to make the “corresponding” in “the display position of the second icon220corresponds to the position of at least one infrared emitting unit23or infrared receiving unit24” definite.

In some embodiments, in the above display device provided by embodiments of the disclosure, a geometric center of the second icon220corresponds to a central position of the corresponding infrared emitting unit23. It may be specifically understood that a line connecting the geometric center of the second icon220and the central position of the infrared emitting units23is parallel to the horizontal direction or the vertical direction. It should be noted that the corresponding mode is a substantially corresponding mode and cannot guarantee absolute corresponding.

In addition, for the one-to-many touch control mode, each infrared emitting unit23has one effective signal emitting angle. For one infrared emitting unit23, the effective infrared light signal emitted within a certain angle can be received by the infrared receiving unit24, so it may be used for infrared touch control recognition. Beyond the angle, the infrared light signal is seriously attenuated or not used for the system settings. Therefore, in some embodiments, in the above display device provided by embodiments of the disclosure. “the display position of the second icon220corresponds to the position of at least one infrared emitting unit23or infrared receiving unit24” may be explained as that the geometric center of the second icon220is positioned within the effective signal emitting angle range of the corresponding infrared emitting unit23.

Specifically, the second icon220may be disposed in the horizontal fourth touch area402, and may also be disposed in the fourth touch area402in the vertical direction, or one or more second icons402may be disposed both in the horizontal and vertical fourth touch areas402.

Only one infrared emitting unit23and one infrared receiving unit24are shown inFIG.8A. It should be noted that an actual product may have the plurality of infrared emitting units23and the plurality of infrared receiving units24. The display module I may also display the plurality of second icons220, it only needs to ensure that the display position of each second icon220in the fourth touch area402corresponds to the position of at least one infrared emitting unit23or infrared receiving unit24in position.

In some embodiments, the above display device provided by embodiments of the disclosure may further include: a processor, wherein the processor is configured to receive a first operation of the user and control the display position of the second icon to move, and the display position of the second icon after movement corresponds to the position of the at least one infrared emitting unit. Specifically, in response to the first operation of the user, the position of the second icon220moves, and after movement, the display position of the second icon220still needs to correspond to the position of one infrared emitting unit23, only the corresponding infrared emitting unit23is changed. For example, the first operation may be: receiving long-press click and drag operations of the user, and the position of the second icon220moves.

Specifically, in the one-to-many touch control mode, there will be a sixth touch area in a corner area of the third touch area401, and the sixth touch area is not only related to the density of the infrared emitting units23, but also is related to the position of the infrared emitting units23. For example, for the one-to-seven touch control solution, the infrared light emitted by the infrared emitting units23located in the middle area can be received by the seven infrared receiving units24, so there will be seven effective touch control light beams. However, for a corner area, for example, in a series of infrared emitting units23, the infrared light emitted by one infrared emitting unit23located in the most corner area can only be received by four infrared receiving units24, therefore, the effective touch light of the infrared emitting unit23located in the corner area is greatly reduced. Currently, in the related art, the touch control precision is generally improved by increasing the density of the infrared emitting (receiving) units23in the corner area, but the problem cannot be completely solved by merely increasing the density of the infrared emitting units23. Therefore, in the display device, the sixth touch area is generally provided in the four corner areas.

Based on this, in the above display device provided by embodiments of the disclosure, as shown inFIG.9, the third touch area401may include the sixth touch area301and a fifth touch area302, touch control precision of the sixth touch area301is lower than touch control precision of the fifth touch area302, and the sixth touch area301covers each corner area of the third touch area301. Specifically, when designing the display product, a development engineer can learn the sixth touch area301according to parameters of the infrared touch assembly2, such as the four corners. For another example, the sixth touch area301may also be a low-density area of the infrared emitting (receiving) units23. The range of the sixth touch area301in the four corner areas may be determined by calculating a distance from a vertex angle, for example, along the edge of the display area of the display module, a distance within 5 cm of the vertex as the sixth touch area301. The numerical range of the distance is not limited in the present embodiment, because the numerical range of the distance is closely related to the type and size of the infrared emitting units23and the setting of the infrared touch assembly.

In some embodiments, in the above display device provided by embodiments of the disclosure, as shown inFIG.9, the display module I may control an area corresponding to the fifth touch area302to display at least one third icon230on at least one display interface. Limiting the position of the third icon230to the fifth touch area302may improve the convenience of the user operation. If the third icon230is displayed in the sixth touch area301, it may cause that the third icon230may not be started accurately and quickly when the user clicks the third icon230. Only one infrared emitting unit23and one infrared receiving unit24are shown inFIG.9. It should be noted that an actual product may have the plurality of infrared emitting units23and the plurality of infrared receiving units24. The display module I may also display the plurality of third icons230, and the third icons230may meet the setting rules of the first icon210or the second icon220in the above solution.

Correspondingly: the processor of the display device is configured to receive a second operation of the user and control a display position of the third icon230to move in the display area following the second operation, and the display position of the third icon230after movement is positioned within a range where the fifth touch area302is located. Specifically, the position of the third icon230will be adjusted in response to the second operation of the user. For example, the position of the third icon230will move under dragging of the user. In the solution provided by embodiments of the disclosure, when the third icon230moves in response to a dragging operation of the user, the moving range of the third icon230is limited to the fifth touch area302, that is, after the user completes the position adjustment operation of the third icon230, the position of the third icon230finally displayed is within the fifth touch area302. That is, when it is determined that the third icon230) moves to the sixth touch area301when the user stops the second operation, the display position of the third icon230after movement is controlled to be positioned within the range of the fifth touch area302. For example, when the user drags the third icon230, the third icon230will move accordingly. When the user drags the third icon230to move to the sixth touch area301, the third icon230will also move to the sixth touch area301. But when the user stops dragging the third icon230, for example, when the user lifts his/her hand, the third icon230will automatically go back to the high touch control precision area302for display, such as the middle area corresponding to the touch area, to ensure that the final display position of the third icon230is located in the high touch control precision area302.

In some embodiments, in the above display device provided by embodiments of the disclosure, the display module I may further control to display at least one fixed image in the area corresponding to the sixth touch area301on at least one display interface, that is, the sixth touch area301is only used for display and does not display the third icon230used for interacting with the user, so as to improve utilization of the sixth touch area301.

Specifically, the mechanism by which the above display device provided by embodiments of the disclosure realizes infrared touch control is as follows.

The display device includes an infrared controller, a microprocessing control drive circuit (i.e., a shift latch) in the infrared controller sequentially turns on the infrared emitting units, that is, only one infrared emitting unit is controlled to emit the infrared light at a certain time through a timing control circuit. Meanwhile, the corresponding infrared receiving unit is addressed through an address line and a data line, and the corresponding infrared receiving unit is controlled to receive the effective infrared light signal, and the received and sensed luminous flux is amplified and converted into a digital signal by an amplifier and an AD converter, which is then sent to a microprocessor for processing through wiring, thereby determining whether touch occurs.

When the user touches a screen, a finger will block the infrared light passing through the horizontal and vertical directions of the position. The change of the light signal causes an electrical signal output by a photoelectric detection circuit to change. When the microprocessor scans and checks, it will find the blocked infrared light and determine that there may be a touch. After scanning all the infrared signals of an X axis, it switches to a Y axis for scanning, and starts the corresponding infrared emitting unit and infrared receiving unit. If it is found that infrared rays are also blocked on the Y axis, it means that the touch is found, and the positions of the infrared receiving unit and the infrared emitting unit corresponding to the blocked light on the two axes are reported to a host, and the position of a touch point on the screen is determined through calculation. The scanning of each frame starts from the first infrared emitting unit of the X axis to the last infrared emitting unit of the X axis, and then starts from the first infrared emitting unit of the Y axis to the last infrared emitting unit of the Y axis. Any touch object that is opaque to the infrared light can block the infrared rays to realize touch positioning.

The above is just a general mechanism, which is not limited by the present disclosure. Hardware of the infrared touch control is introduced below.

An infrared touch control system is divided into an emitting board and a receiving board. For example, the emitting board mainly includes a slave control module, an infrared emitting module, a digital-to-analog conversion module, an inter-board cascade module, a data buffer module and a power supply module. For example, the receiving board mainly includes a master control module, a slave control module, an infrared receiving module, a digital-to-analog conversion module, an inter-board cascade module, a data buffer module and a power supply module.

In order to realize infrared touch control recognition, the display device generally includes an infrared control module, such as an infrared control chip. The infrared control module generally further includes a mater control module and a slave control module. The main tasks are three major functions of system mode control, logic control of emitting and receiving channel selection, and coordinate calculation of shielding points. Generally, the master control module completes the two functions of system mode control and coordinate calculation of the shielding point, and the slave control module completes the logic control of the emitting and receiving channel selection.

The master control module, for example, may be composed of an ARM chip STM32F103T8U6 processor and its peripheral circuits, which can provide clock signals and synchronization signals for the touch control system. The mainly realized functions include the following.

1. A system mode control: different working modes are selected and switched.

2. The slave control chip is controlled through a communication protocol (such as SPI protocol), infrared emitting unit and receiving unit array codes are stored, instructions are sent to the slave control chip, and the certain emitting unit is lightened or the certain receiving unit is gated.

3. The infrared control module generally further includes an analog-to-digital conversion module, and the master control module further receives the converted data from the analog-to-digital conversion module, and calculates coordinates of the shielding points.

4. The clock signals and synchronization signals are provided for the slave control module.

5. Communicate with an upper computer through a certain communication protocol (such as USB protocol) to transmit the coordinates of the shielding points.

The slave control module, for example, may be composed of an FOPGA chip and its peripheral circuits. The slave control module exists on each emitting board and receiving board, and its specific functions may be divided into the following aspects.

An instruction signal sent by a master control chip is received and decoded, and the address code is verified. If verification is successful, an operation is executed according to an instruction command. If the verification is not successful, an SPI signal is sent to the next board through an inter-board data interface.

On the emitting board, according to the decoded SPI instruction, a gating signal is provided for an infrared emitting tube drive chip TLC59025 to realize turning on or off of an infrared emitting tube channel.

On the receiving board, according to the decoded SPI instruction, a gating signal is provided for the infrared receiving tube gating chip 74LV4051 to realize turning on or off of an infrared receiving tube channel.

On the receiving board, a clock signal and an enable signal are provided for an A/D conversion chip.

Infrared receiving module: the infrared receiving module may include an infrared receiving unit (such as an infrared receiving tube) and a channel selection switch (such as a shift register). After the infrared receiving tube receives the light, a current signal is obtained, a voltage signal is obtained through a load resistance, the obtained voltage signal is sent to the channel selection switch, and the channel selection module may realize gating of the signal.

Digital-to-analog conversion module: after the infrared receiving tube receives the light, the current signal is generally obtained, and may be converted into the voltage signal through the load resistance. The current voltage is an analog signal, which will pass through the digital-to-analog conversion module to obtain a digital signal, and the digital signal is sent to the master control module, for example, the digital-to-analog conversion module is AD9203.

In some embodiments, the infrared touch control system further includes a data buffer module, a power supply module and the like.

In an actual touch operation, as mentioned above, different manufacturers may adopt different scanning modes, such as a one-to-one scanning mode, or a one-to-many scanning mode.

For the realization of multi-touch, the one-to-many scanning mode must be adopted.

In one scan cycle, the hardware-based scanning mode also has the following three solutions.

(1) Full-screen serial sequential scanning: after one infrared emitting unit is turned on, the plurality of receiving units corresponding to it are turned on one by one.

(2) Full-screen serial interval scan: for all the emitting units, firstly all scanning in one direction is completed, and then scanning in the other direction is completed, thus completing scanning in all the directions in turn.

In addition, there is a mode of tracking scanning, which is not described in detail here. The above content is the basic hardware and touch control realization method of the infrared touch control system. Finally, the master control module will send the coordinates of the shielding points to the upper computer. For example, data transmission between the upper computer (such as a PC host) and the HID may be realized through the USB/HID protocol, of course, the upper computer also needs to load or install the corresponding driving program to communicate with the infrared touch control system.

After the upper computer obtains coordinate data of the shielding points, a first image of a candidate touch point is generated. However, due to discreteness of an infrared light path, interference of ambient light, and the hardware problems, there will be more noisy points. Therefore, the upper computer further needs to perform a series of processing on the first image, such as smooth denoising, image segmentation, ghost focus removal, and touch point positioning. After touch point positioning is obtained, operations such as clicking the icon, and writing on the electronic whiteboard can be further realized.

Specifically: in the above display device provided by embodiments of the disclosure, due to uneven distribution density of the infrared emitting units in the infrared emitting frame, the touch control precision in the touch area is different, for example, the touch control precision of the first touch area and the second touch area is high, and the touch precision of other areas is low. The area with the high distribution density of the infrared emitting units such as the first touch area and the second touch area may be called a seventh touch area, and a touch area formed on the surface of the display module by the area with the low distribution density of the infrared emitting units is called an eighth touch area.

Since display precision of the display modules under the different touch control precisions is the same, under the same touch control scanning frequency and display scanning frequency: when line is continuously drawn in the display area of the display module, a problem that a display trajectory cannot follow the picture in time when crossing the different touch control precision areas because the drawing speed is the same but the increment speed of the displayed graphics is different is generated.

Based on this, in the above display device provided by embodiments of the disclosure, when it is determined that a signal received by the infrared receiving units is to draw a local continuous line shape, an incremental change length of a displayed line segment in the eighth touch area may be controlled to be ΔL1, an incremental change length of a displayed line segment in the seventh touch area is controlled to be ΔL2, and ΔL1 and ΔL2 are adjusted to be ΔL1>ΔL2 to ensure that the drawn line shape trajectory quickly follows the movement trajectory of the touch point in the different touch control precision areas.

Specifically, as shown inFIG.10, when the wiring trend of the continuously drawn line shape is approximately parallel to the bezel (a long side or a short side) of the display module, in a process that the user draws the continuous graphics at the same drawing speed, the incremental change length ΔL1 of the drawn line segment of the display module when a starting point of the operation of continuously drawing the line shape is in the area602with the low touch control precision is greater than the incremental change length ΔL2 of the drawn line segment of the display module when the starting point of the continuously drawn line shape is in the area601with the high touch control precision.

Specifically, when there is a certain included angle between the wiring trend of the continuously drawn line shape and the bezel of the display module, in a process of drawing touch points at the same moving speed to generate the continuously drawn line shape, in the area with the low touch control precision, a vertical component of the length ΔL1 of each growth of the picture graphics in the long side direction is XΔL1, a vertical component in the short side direction is YΔL1, and XΔL1*XΔL1+YΔL1*YΔL1=ΔL1*ΔL1, as shown inFIG.11. In the area with the high touch control precision, a vertical component of the length ΔL2 of each growth of the picture graphics in the long side direction is XΔL2, a vertical component in the short side direction is YΔL2, and XΔL2*XΔL2+YΔL2*YΔL2=ΔL2*ΔL2.

Further, a specific numerical proportional relationship between ΔL1 and ΔL2 may be set as follows: in the seventh touch area, one line segment growth is displayed every X1 frames of images, and a length of each growth is ΔL3, namely. ΔL3=ΔL2; and in the eighth touch area, one line segment growth is displayed every X2 frames of images, and a length of each growth is (X2/X1)*ΔL3=ΔL1, where X2 is greater than X1.

Specifically, when the wiring trend of the continuously drawn line shape is approximately parallel to the bezel of the display module, in the process of drawing the contact point at the same moving speed to generate the continuously drawn line shape, in the area with the high touch control precision, one growth is displayed every X1 frames of images, and a length of each growth is ΔL3; and in the area with the low touch control precision, one growth is displayed every X2 frames of images, and a length of each growth is (X2/X1)*ΔL3, where X2 is greater than X1. Specifically, both X1 and X2 are positively related to the spacing between the infrared emitting units at their corresponding positions.

Specifically, when there is a certain included angle between the wiring trend of the continuously drawn line shape and the bezel of the display module, in the process of drawing the touch point at the same moving speed to generate the continuously drawn line shape, in the area with the high touch control precision, a vertical component of the length ΔL3 of each growth of the picture graphics in the long side direction is XΔL3, a vertical component in the short side direction is YΔL3, and XΔL3*XΔL3+YΔL3*YΔL3=ΔL3*ΔL3. In the area with the low touch control precision, a vertical component of the length of each growth of the picture graphics in the long side direction is X2/X1*XΔL3, and a vertical component in the short side direction is X2/X1*YΔL3.

Specifically, in the above mentioned display device provided by embodiments of the disclosure, a scanning frequency of the infrared touch assembly is H1, a frequency of feedback data output by the infrared touch assembly is H2, a display frequency of video data of the display module is H3, and the frequency H2 is generally lower than the frequency H1, while the scanning frequency H1 is generally less than the frequency H3.

In some embodiments, in the above display device provided by embodiments of the disclosure, an effective feedback time interval of touch control data corresponding to the seventh touch area is T1, and a feedback time interval of touch control data corresponding to the eighth touch area is T2, where T1/T2 is positively correlated with ΔL1/ΔL2. Specifically, the effective feedback time refers to a time from the time when displacement of a touch operation changes to the time when a position of the touch control recognition point changes.

Specifically, when scanning is performed at the same scanning frequency H1, and when the wiring trend of the continuously drawn line shape is approximately parallel to the bezel of the display module, in the process of drawing the touch point at the same moving speed to generate the continuously drawn line shape, in the area with the high touch control precision, a time interval for moving from the previous point to the next point in the touch control feedback data is T1, and the incremental change length of the displayed line segment of the display module is ΔL2; and in the area with the low touch control precision, a time interval for moving from the previous point to the next point in the touch control feedback data is T2, and the incremental change length of the displayed line segment of the display module is ΔL1. T1/T2 is positively correlated with ΔL1/ΔL2, and both ΔL1 and ΔL2 are negatively correlated with H3.

Specifically, when scanning is performed at the same scanning frequency H1, and when there is the certain included angle between the wiring trend of the continuously drawn line shape and the bezel of the display module, in the process of drawing the touch point at the same moving speed to generate the continuously drawn line shape, in the area with the high touch control precision, the time interval for moving from the previous point to the next point in the touch control feedback data is T1, a vertical component of the incremental change length ΔL2 of the displayed line segment of the display module in the long side direction is XΔL2, and a vertical component in the short side direction is YΔL2; and in the area with the low touch control precision, the time interval for moving from the previous point to the next point in the touch control feedback data is T2, a vertical component of the incremental change length ΔL1 of the displayed line segment of the display module in the long side direction is XΔL1, and a vertical component in the short side direction is YΔL1. T1/T2 is positively correlated with XΔL1/XΔL2, and T1/T2 is positively correlated with YΔL1/YΔL2.

The above display device provided by embodiments of the disclosure includes the display module and the infrared touch assembly, where the display surface of the display module is in the shape of the rectangle with the edge extending in the first direction and the edge extending in the second direction, and the first direction and the second direction are perpendicular to each other; the infrared touch assembly includes the infrared emitting frame and the infrared receiving frame which are disposed oppositely and extend in the first direction: the plurality of infrared emitting units are fixed in the infrared emitting frame: the plurality of infrared receiving units are fixed in the infrared receiving frame; and the orthographic projection of the light-emitting surface of the infrared emitting frame in the display module is located in the area outside the display area of the display module. The infrared emitting units with the uneven distribution density are disposed in the infrared emitting frame, such that not only is the conventional touch operation realized, but also, the cost of the infrared touch assembly is reduced, and the cost of the display device is accordingly reduced.

Based on the same inventive concept, an embodiment of the disclosure further provides another display device, including: a display module and an infrared touch assembly.

The infrared touch assembly includes an infrared emitting frame and an infrared receiving frame, a plurality of infrared emitting units are fixed in the infrared emitting frame, and a plurality of infrared receiving units are fixed in the infrared receiving frame.

One infrared emitting unit corresponds to the plurality of infrared receiving units, and an effective infrared light signal emitted by one infrared emitting unit is simultaneously received by the plurality of corresponding infrared receiving units.

Touch areas formed on a surface of the display module by effective infrared light signals emitted by all the infrared emitting units are divided into a third touch area and a fourth touch area, and touch control precision of the third touch area is higher than touch control precision of the fourth touch area; and the third touch area is located in a central area of the touch area, and the fourth touch area is located in at least one edge area of the touch area.

The display module displays at least one second icon on at least one display interface in an area corresponding to the fourth touch area.

A display position of the second icon corresponds to a position of the at least one infrared emitting unit or infrared receiving unit.

Specifically, the following two solutions may describe what “corresponding” in “the display position of the second icon corresponds to the position of at least one infrared emitting unit or infrared receiving unit” is.

The first solution: a geometric center of the second icon corresponds to a central position of the corresponding infrared emitting unit. It may be specifically understood that a line connecting the geometric center of the second icon and the central position of the infrared emitting units is parallel to the horizontal direction or the vertical direction. It should be noted that the corresponding mode is roughly corresponding and cannot guarantee strict corresponding.

Because the one-to-many touch control mode, each infrared emitting unit has one effective signal emitting angle. For one infrared emitting unit, the effective infrared light signal emitted within a certain angle can be received by the infrared receiving unit, so it may be used for infrared touch control recognition. Beyond the angle, the infrared light signal is seriously attenuated or the system settings do not use it. Therefore, “corresponding” may be explained as that the geometric center of the second icon is positioned within the effective signal emitting angle range of the corresponding infrared emitting unit.

Specifically, the second icon may be disposed in the horizontal fourth touch area, and may also be disposed in the fourth touch area in the vertical direction, or one or more second icons may be disposed both in the horizontal and vertical fourth touch areas.

For the specific parameters of the third touch area and the fourth touch area, as well as other specific setting rules of the second icon, reference may be made to the display device in the previous embodiment, which is not described in detail here.

Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. In this way, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent art, the present disclosure also intends to include these modifications and variations.