CN110058742B - Display device, touch detection method and device - Google Patents
Display device, touch detection method and device Download PDFInfo
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- CN110058742B CN110058742B CN201910330439.3A CN201910330439A CN110058742B CN 110058742 B CN110058742 B CN 110058742B CN 201910330439 A CN201910330439 A CN 201910330439A CN 110058742 B CN110058742 B CN 110058742B
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04101—2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
Abstract
The disclosure provides a display device, a touch detection method and a touch detection device. The display device includes: the infrared light source is positioned outside the display area of the display device and used for providing infrared light illumination for the touch surface to be detected; the sensing layer comprises a plurality of infrared sensors distributed in the display area, the infrared sensors are used for detecting a first distance, and the first distance is a transmission distance of infrared light which starts from an infrared light source and reaches the infrared sensors after being reflected on a touch surface to be detected; the optical structure layer is positioned on at least one side of the sensing layer in the thickness direction and comprises a plurality of optical structures, each optical structure is positioned on one side of the corresponding infrared sensor in the thickness direction, and the optical structures are used for limiting the incident angle of infrared light reaching the corresponding infrared sensor. The present disclosure can achieve a depth detection mode that requires a simpler structure.
Description
Technical Field
The present disclosure relates to the field of display, and in particular, to a display device, a touch detection method, and a touch detection device.
Background
In the three-dimensional space detection technology, no matter the binocular stereo vision technology, the structured light technology or the tof (time of flight) technology, the depth detection is completed by realizing the imaging function in a mode similar to a camera, and the used device is difficult to manufacture on a display panel, generally can be integrated into a display device only in the form of an auxiliary module, and is not beneficial to the simplification of the structure of the display device.
Disclosure of Invention
The present disclosure provides a display device, a touch detection method and a touch detection device, which can implement a depth detection mode requiring a simpler structure.
In a first aspect, the present disclosure provides a display device comprising:
the infrared light source is positioned outside the display area of the display device and used for providing infrared light illumination for the touch surface to be detected;
the sensing layer comprises a plurality of infrared sensors distributed in the display area, and the infrared sensors are used for detecting a first distance, wherein the first distance is a transmission distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected;
the optical structure layer is positioned on at least one side in the thickness direction of the sensing layer and comprises a plurality of optical structures, each optical structure is positioned on one side in the thickness direction of the corresponding infrared sensor, and the optical structures are used for limiting the incident angle of infrared light reaching the corresponding infrared sensors.
In one possible implementation, the infrared light source includes at least two light emitting elements surrounding a display area of the display device.
In a possible implementation manner, the infrared light source further includes a light emission control circuit respectively connected to each of the light emitting elements, and the light emission control circuit is configured to control the at least two light emitting elements to emit light one by one in each detection period.
In a possible implementation manner, the display device further includes a touch circuit, each of the infrared sensors is connected to the touch circuit,
the touch control circuit is used for determining a position point of infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle of each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
In one possible implementation, the display device includes an organic light emitting layer including a plurality of light emitting patterns located within the display area;
in the plane of the display device, at least one part of the orthographic projection of each infrared sensor is positioned between the orthographic projections of the two adjacent luminous patterns.
In a possible implementation manner, in a plane of the display device, the orthographic projection of each infrared ray sensor is positioned between the orthographic projections of two adjacent luminous patterns.
In one possible implementation manner, the display device further includes a first substrate, a second substrate, and an organic light emitting layer, and the organic light emitting layer, the optical structure layer, and the sensing layer are sequentially stacked between the first substrate and the second substrate.
In one possible implementation, the infrared light source and the organic light emitting layer are located at the same layer between the first substrate and the second substrate.
In a possible implementation manner, the display device further includes a first substrate, a second substrate, a third substrate, and an organic light emitting layer, the second substrate is located between the first substrate and the third substrate, the organic light emitting layer is located between the first substrate and the second substrate, and the optical structure layer and the sensing layer are located between the second substrate and the third substrate.
In a second aspect, the present disclosure also provides a touch detection method, including:
controlling an infrared light source to provide infrared light illumination to the touch surface, the infrared light source being located outside a display area of the display device;
acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, wherein the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected, the incident angle of the infrared light which reaches each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
determining a position point of the infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle, aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
In one possible implementation, the infrared light source includes at least two light emitting elements surrounding a display area of the display device;
correspondingly, the providing infrared light illumination to the touch surface by an infrared light source comprises:
controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element;
correspondingly, the method further comprises the following steps:
and integrating the detection results respectively corresponding to each light-emitting element to obtain the detection result of the touch surface to be detected.
In a third aspect, the present disclosure also provides a touch detection device, including:
the light emitting control module is used for controlling an infrared light source to provide infrared light illumination for the touch surface, and the infrared light source is positioned outside a display area of the display device;
the detection module is used for acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance from an infrared light source to the infrared sensor after the infrared light is reflected on the touch surface to be detected, an incident angle of the infrared light reaching each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
the processing module is used for determining a position point of infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle respectively aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
In one possible implementation, the infrared light source includes at least two light emitting elements surrounding a display area of the display device;
correspondingly, the light emission control module is further configured to:
controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element;
correspondingly, the device further comprises:
and the integration module is used for integrating the detection results respectively corresponding to each light-emitting element so as to obtain the complete detection result of the touch surface to be detected.
In a fourth aspect, the present disclosure also provides a touch detection device, the device comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to:
controlling an infrared light source to provide infrared light illumination to the touch surface, the infrared light source being located outside a display area of the display device;
acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, wherein the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected, the incident angle of the infrared light which reaches each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
determining a position point of the infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle, aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
According to the technical scheme, the infrared light source, the sensing layer and the optical structure layer can be matched with each other to detect the position of infrared light reflected on the touch surface to be detected, so that the detection of the finger surface when a finger approaches the display device is realized. Compared with the depth detection technology which needs to use a camera device, the depth detection mode provided by the disclosure does not need to introduce an image processing module or a complex CMOS device manufacturing process, and the required structure and the manufacturing process are simpler.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present disclosure, and reasonable modifications of the drawings are also covered in the protection scope of the present disclosure.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display device according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a display device according to yet another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a display device according to still another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a display device according to yet another embodiment of the present disclosure
Fig. 6 is a flowchart illustrating a touch detection method of a display device according to an embodiment of the present disclosure;
fig. 7 is a block diagram of a touch detection device of a display apparatus according to an embodiment of the present disclosure;
fig. 8 is a block diagram of a touch detection device of a display apparatus according to still another embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or similar words means that the element or item preceding the word covers the element or item listed after the word and its equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, and the connections may be direct or indirect.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. Referring to fig. 1, the display device includes an infrared light source 21, a sensing layer 22, and an optical structure layer 23. Wherein the infrared light source 21 is located outside the display area of the display device for providing infrared light illumination for the touch surface 100 to be detected; the sensing layer 22 includes a plurality of infrared sensors 221 distributed within the display area; the optical structure layer 23 is located on one side of the sensing layer 22 in the thickness direction, and includes a plurality of optical structures 231, and each optical structure 231 is located on one side of a corresponding one of the infrared sensors 221 in the thickness direction. Each of the infrared ray sensors 221 is configured to detect a propagation distance (hereinafter, referred to as a "first distance") of infrared light from the infrared light source 21 to the infrared ray sensor 221 after being reflected on the touch surface 100 to be detected, and each of the optical structures 231 is configured to limit an incident angle of the infrared light reaching the corresponding infrared ray sensor 221.
In one example, the sensing layer 22 and the optical structure layer 23 are both layer structures formed on a substrate in a display panel of the display device (other layer structures, such as at least one of a metal electrode layer, a transparent electrode layer, an organic light emitting material layer, and an insulating material layer, may also be formed on the substrate). Illustratively, the infrared light source 21 may be located in the display panel (e.g., on the substrate outside the display area), on a circuit board in a binding relationship with the display panel, on a bezel surrounding the display panel, or between the bezel and the display panel.
Referring to fig. 1, in one example, the process of touch detection of the display device may be as follows: when a user's finger approaches the surface of the display device, the surface of the finger forms the touch surface 100 to be detected, and the infrared light source 21 can provide infrared light illumination to the touch surface 100 to be detected. The infrared light emitted from the infrared light source 21 may be partially reflected when reaching the touch surface 100 to be detected, and the reflected infrared light may reach the optical structure layer 23 according to different incident angles. Thus, each optical structure 231 in the optical structure layer 23 may prevent infrared light with an incident angle outside a prescribed range from reaching the corresponding infrared sensor 221 based on a structure such as a collimating microlens or a collimating thick hole, so that each infrared sensor 221 can only receive infrared light with an incident angle within a prescribed range. Thus, when a first distance (e.g., the sum of the first length L1 and the second length L2 in fig. 1) is detected by one of the infrared sensors 221, the position at which the infrared light is reflected (e.g., the position of the point P0 in fig. 1, whose coordinate values in the thickness direction of the display device can be represented by the second length L2 in the display area, and the coordinate values in the other two coordinate directions can be represented by the position coordinates of the infrared sensor 221 in the display area) can be calculated by combining the incident angle (e.g., about 90 °) limited by the optical structure 231 and the positional relationship between the infrared sensor 221 and the infrared light source 21 (e.g., represented by the third length L3 in fig. 1) through geometric principles. It should be understood that, for convenience of calculation, simplification or reduction may be performed in the above calculation process, for example, the height difference between the infrared sensor 221 and the infrared light source 21 is ignored, or the middle value of the range of the incident angle limited by the optical structure 231 (for example, the middle value of the range of the incident angle from 85 degrees to 95 degrees is 90 degrees) is used to represent the incident angle for calculation, and so on. Based on the first distance detected by each infrared sensor 221, the position of a point on the touch surface 100 to be detected can be obtained. Therefore, the obtained positions of all points can be integrated to obtain the depth image of the surface of the finger of the current user, and accordingly, the touch control is realized.
It can be seen that the infrared light source, the sensing layer and the optical structure layer in the embodiment of the disclosure can cooperatively detect the position where infrared light is reflected on the touch surface to be detected, so as to realize the detection of the finger surface when the finger is close to the display device. Compared with the depth detection technology which needs to use a camera device, the depth detection method provided by the embodiment of the disclosure does not need to introduce an image processing module or a complex CMOS device manufacturing process, and the required structure and the manufacturing process are simpler.
In order to obtain a desired detection result, the display device may be configured as follows: the irradiation area of the infrared light source 21 may be inclined toward the display panel to cover a possible spatial range of the touch surface 100 to be detected as much as possible; the emission wavelength of the infrared light source 21 may be matched with the receiving wavelength of the infrared sensor 221 (e.g., the dominant wavelength of the infrared light emitted by the infrared light source 21 coincides with the most sensitive wavelength of the infrared sensor 221) to increase the signal-to-noise ratio of the sensing signal; the infrared sensor 221 may be formed using a device capable of quickly responding to infrared light, such as an avalanche diode, a PIN photodiode, or the like; the range of incident angles limited by the optical structure 231 may be as small as possible to reduce computational errors and enhance suppression of noisy light. Further, for the convenience of calculation, the positional relationship between the infrared light source 21 and each infrared sensor 221 may be fixed, so that the above-described positional relationship between the infrared sensor 221 and the infrared light source 21 may be configured in advance in the display device as a fixed parameter without performing the step of acquiring the positional information of the infrared light source 21 during the touch detection.
As can be seen in the above-described touch detection process, if there are regions on the touch surface 100 to be detected that are not irradiated with infrared light, no infrared light is reflected in these regions and received by the infrared sensor 221, so that these regions become blind regions for touch detection. To avoid the occurrence of the blind area, a light emitting element having a large illumination range may be used as much as possible in the infrared light source 21, or infrared light may be provided to the touch surface 100 to be detected by a plurality of light emitting elements, respectively.
Fig. 2 is a schematic structural diagram of a display device according to still another embodiment of the present disclosure. Referring to fig. 2, in one example, the infrared light source 21 in the display device includes a first light emitting element 211 and a second light emitting element 212, and the first light emitting element 211 and the second light emitting element 212 surround the display area of the display device (fig. 2 shows an example of being located on the left and right sides of the display panel). As such, the first light emitting element 211 and the second light emitting element 212 may provide infrared light illumination to different areas of the touch surface 100 to be detected, respectively (the illumination areas of the different light emitting elements may partially overlap). On the basis, since the infrared sensor 221 cannot distinguish which light-emitting element the received infrared light comes from, each light-emitting element can be made to emit light in different time periods during touch detection, and touch detection can be performed using position data of different light-emitting elements (i.e., data indicating a positional relationship between the infrared sensor and the infrared light source) in different time periods, so as to obtain depth image data under different illumination areas, respectively, and a final depth image can be obtained by integrating the depth image data under each illumination area.
In one example, the display device performs touch detection once in each detection cycle, wherein each detection cycle includes a first period and a second period, and a start time of the second period is after an end time of the first period. Referring to fig. 2, during a first period of time, the first light emitting element 211 provides infrared light illumination to the touch surface to be detected 100 from the left side in fig. 2, and at this time, the touch surface to be detected 100 in the illumination area can be detected according to the above-described procedure by acquiring the sensing signal of each infrared sensor 221; during the second time period, the second light emitting element 212 provides infrared light illumination to the touch surface to be detected 100 from the right side in fig. 2, and at this time, the touch surface to be detected 100 within the illumination area can be detected by acquiring the sensing signal of each infrared sensor 221 according to the above-described procedure. After the second period of time ends, the depth image data of the overlapping portion of the illumination areas of the two light-emitting elements may be integrated (for example, a midpoint of a line segment formed by connecting two position points detected successively based on the sensing signal of the same infrared sensor 221 is used as an integration result), so as to be combined with the depth image data of other portions into a depth image detected in the current detection period.
For example, the infrared light source 21 may further include more than two light emitting elements, which may surround the display area of the display device, and may implement detection of each frame depth image by emitting light one by one in each detection period.
Fig. 3 is a schematic structural diagram of a display device according to still another embodiment of the present disclosure. Referring to fig. 3, in the display device, the infrared light source 21 includes a first light emitting element 211, a second light emitting element 212, a third light emitting element 213, and a fourth light emitting element 214 surrounding a display area a1, and the first light emitting element 211, the second light emitting element 212, the third light emitting element 213, and the fourth light emitting element 214 are all located in the peripheral area a2 outside the display area a 1. In addition, the display device further includes a light-emitting control circuit 24 and a touch control circuit 25, wherein the light-emitting control circuit 24 is connected to each light-emitting element through a connection structure, and the touch control circuit 25 is connected to each infrared sensor 221 in the display area a1 through a connection structure. In one example, the light emission control circuit 24 may supply a current to the light emitting elements based on the connection with the light emitting elements, and control the light emission state of each light emitting element by controlling the on/off of the current and the magnitude of the current. The touch control circuit 25 can receive the sensing signal collected by the infrared sensor 221 based on the connection with the infrared sensor 221, and thus implement the touch detection process. In addition, the light emission control circuit 24 and the touch circuit 25 may use the same clock signal, thereby ensuring synchronization with each other; in one example, the light emission control circuit 24 and the touch control circuit 25 may be connected to the same timing controller and receive a synchronous clock signal from the timing controller.
Referring to fig. 1 and 3, in one example, the process of touch detection of the display device may be as follows: the display device makes one touch in each detection periodThe light emission control circuit 24 controls each light emitting element to emit light one by one in each detection period correspondingly to detection. Taking the period of time when the first light emitting element 211 emits light as an example, the touch circuit 25 may perform detection in each illumination area on the touch surface 100 to be detected in the following manner: first, the touch circuit 25 obtains a first distance detected by each of the infrared sensors 221. For example, the touch circuit 25 may receive the sensing signal of each infrared sensor 221 based on the connection with each infrared sensor 221, and after at least one of shaping, amplifying, and filtering the sensing signal, the touch circuit 25 may detect data representing the first distance size. It should be noted that the infrared sensor 221 may detect the first distance based on a method of calculating time by a pulsed light source, a method of calculating time by charge accumulation, or a method of calculating time of flight of light, and may not be limited thereto. It should be understood that the infrared sensor 221 may generate a sensing signal with a voltage amplitude close to zero due to no infrared light being received, and thus the detected data with a magnitude close to zero indicates that the infrared sensor 221 does not detect infrared light. Then, the touch circuit 25 can determine, for each infrared sensor 221, a position point at which the infrared light reaching the infrared sensor 221 is reflected on the touch surface 100 to be detected, from the first distance, the second distance (the distance between the infrared sensor 221 and the light emitting element that is emitting light), and the receiving angle (limited by the optical structure 231). For example, in the case where the reception angle is 90 ° as shown in fig. 1, the height difference H1 between the sensing layer 22 and the first light emitting element 11 may be measured or estimated in advance as a fixed parameter, thereby obtaining the calculated relationship L3 according to the pythagorean theorem2+(L2-H1)2＝L12The calculated data table is stored in the memory of the touch circuit 25, which can read the data, so that the touch circuit 25 can obtain the depth data (i.e. the L2) of the corresponding position point according to the first distance (i.e. L1+ L2) and the position identifier (used for representing the second distance, i.e. the L3) of the infrared sensor 221 by looking up the table, and the depth data (i.e. the L2) is stored in the touch detection node corresponding to the position identifier of the infrared sensor 221In the storage area of the fruit. After the processing for each infrared sensor 221 is completed, the storage area of the touch detection result stores a plurality of depth data corresponding to the position identifier of the infrared sensor 221, which can represent the position of a plurality of points on the touch surface 100 to be detected in the three-dimensional space relative to the display device (i.e., can be drawn as the depth image).
After completing the touch detection corresponding to each of the light-emitting elements, the touch circuit 25 may integrate the detection results respectively corresponding to each of the light-emitting elements to obtain the detection result of the touch surface to be detected. In one example, the touch circuit 25 may store the touch detection results corresponding to different light emitting elements in different storage areas, respectively, to average all the resulting touch detection results after completing the touch detection corresponding to each of the light emitting elements. For example, all non-zero depth data corresponding to the location identity of the same infrared sensor 221 may be averaged. In yet another example, the touch circuit 25 may store the touch detection results corresponding to different light emitting elements in the same storage area. For example, the stored depth data corresponding to the position identifier of each infrared sensor 221 may be set to zero at the beginning of each detection period; when the touch detection result is detected every time, judging whether the position mark of the infrared sensor 221 is stored with depth data which is not zero; if not, directly storing the depth data to be stored; and if so, averaging the depth data to be stored with the stored depth data and then covering the original depth data. Thus, the storage space of the touch detection result can be saved.
It can be seen that, by means of the light-emitting elements emitting light one by one in each detection period and performing touch detection respectively, a plurality of touch detection results in the same detection period can be obtained while the touch detection processes are not interfered with one another, the touch detection results can be supplemented with one another to reduce blind areas of touch detection, and can also be used for mutual comparison to eliminate error data and reduce errors, so that three-dimensional touch detection with more ideal effects is realized.
Fig. 4 is a schematic structural diagram of a display device according to still another embodiment of the present disclosure. Referring to fig. 4, in one example, the display device includes a first substrate 27 and a second substrate 28, and further includes an infrared light source 21, a sensing layer 22, an optical structure layer 23, and an organic light emitting layer, wherein the organic light emitting layer includes a plurality of light emitting patterns 261, a cathode structure layer 262, and an anode structure layer 263, each of the light emitting patterns 261 is located within a display area a1, and the organic light emitting layer, the optical structure layer 23, and the sensing layer 22 are sequentially stacked between the first substrate 27 and the second substrate 28. The infrared light source 21 is located in the peripheral region a2 outside the display region a1, and is located at the same layer as the organic light emitting layer between the first substrate 27 and the second substrate 28. In one example, the cathode structure layer in the organic light emitting layer may include a cathode of the light emitting pattern 261, the anode structure layer 263 in the organic light emitting layer may include an anode of the light emitting pattern 261, and the shape and the configuration of the organic light emitting layer may be implemented by referring to the shape and the configuration of a film layer on a substrate in any one organic light emitting diode display device, which is not described herein again. Referring to fig. 4, in one example, the infrared light source 21 includes an infrared light emitting material layer 210 in the same layer as the light emitting pattern 261, a cathode of the infrared light emitting material layer 210 is in the same layer as the cathode of the light emitting pattern 261, an anode of the infrared light emitting material layer 210 is in the same layer as the anode of the light emitting pattern 261, and the infrared light emitting material layer 210 and the anode and the cathode thereof constitute one light emitting element in the infrared light source 21. That is, the infrared light source 21 may be formed as needed by using the same or similar manufacturing process when the organic light emitting layer is manufactured, so as to simplify the internal structure and manufacturing process of the display device.
Referring to fig. 4, in one example, the orthographic projection of each infrared sensor 221 is located between the orthographic projections of two adjacent light-emitting patterns 261 in the plane of the display device. For example, each of the infrared sensors 221 in fig. 4 is located above a gap between two adjacent light-emitting patterns 261. Thus, infrared light from above can reach the infrared sensor 221 through the gap between the light-emitting patterns 261, implementing the above-described process of touch detection. Therefore, the distance between two adjacent infrared sensors 221 is equivalent to the distance between two adjacent light-emitting patterns 261, which is more beneficial to realizing high-resolution touch detection.
Fig. 5 is a schematic structural diagram of a display device according to still another embodiment of the present disclosure. Referring to fig. 5, in one example, the display device includes a first substrate 27, a second substrate 28, and a third substrate 29, and further includes an infrared light source 21, a sensing layer 22, an optical structure layer 23, and an organic light emitting layer, wherein the organic light emitting layer includes a plurality of light emitting patterns 261, a cathode structure layer 262, and an anode structure layer 263, each of the light emitting patterns 261 is located within a display region, the second substrate 28 is located between the first substrate 27 and the third substrate 29, the organic light emitting layer is located between the first substrate 27 and the second substrate 28, and the optical structure layer 23 and the sensing layer 22 are located between the second substrate 28 and the third substrate 29. In one example, the cathode structure layer in the organic light emitting layer may include a cathode of the light emitting pattern 261, the anode structure layer 263 in the organic light emitting layer may include an anode of the light emitting pattern 261, and the shape and the configuration of the organic light emitting layer may be implemented by referring to the shape and the configuration of a film layer on a substrate in any one organic light emitting diode display device, which is not described herein again.
Referring to fig. 5, in one example, the optical structure layer 23 includes a first optical structure layer and a second optical structure layer respectively located at both sides of the sensing layer 22 in the thickness direction, and the infrared light source 21 includes a first light emitting element 211 and a second light emitting element 212 that provide infrared light illumination to the front side (upper side in fig. 5) of the display device, and further includes a third light emitting element 213 and a fourth light emitting element 214 that provide infrared light illumination to the back side (lower side in fig. 5) of the display device. As such, the optical structure in the first optical structure layer and the optical structure in the second optical structure layer may respectively limit the incident angle of the infrared light reaching the infrared sensor 221 in two directions, and the four light emitting elements may sequentially emit light in each detection period as described above, to simultaneously achieve touch detection on the front surface of the display device and touch detection on the back surface of the display device without generating mutual interference. Taking this as an example, any display device capable of achieving single-sided touch detection in the embodiments of the present disclosure may be modified into a display device capable of achieving double-sided touch detection with reference to the display device shown in fig. 5, and details are not repeated here.
Referring to fig. 5, in one example, the orthographic projection of each of the infrared sensors 221 is partially located between the orthographic projections of two adjacent light-emitting patterns 261 in the plane of the display device. For example, each of the infrared sensors 221 in fig. 5 has at least one gap between two adjacent light-emitting patterns 261. Thus, infrared light from above can reach the infrared sensor 221 through the gap between the light-emitting patterns 261, implementing the above-described process of touch detection. Based on this, the size of the infrared sensor 221 and the optical structure 231 may not need to be consistent with the sub-pixel width of the display device, and the corresponding process requirements and process difficulties may be reduced.
As can be seen from fig. 4 and 5, since the organic light emitting layer, the optical structure layer 23 and the sensing layer 22 in fig. 4 are all located between the first substrate 27 and the second substrate 28, each of the organic light emitting layer, the optical structure layer 23 and the sensing layer 22 needs to be manufactured on the same substrate, which is more demanding on the process level, but is more beneficial to the lightness and thinness of the display device. In fig. 5, the second substrate 28 is located between the first substrate 27 and the third substrate 29, the organic light emitting layer is located between the first substrate 27 and the second substrate 28, and the optical structure layer 23 and the sensing layer 22 are located between the second substrate 28 and the third substrate 29, so that it is not necessary to fabricate each of the organic light emitting layer, the optical structure layer 23 and the sensing layer 22 on the same substrate in terms of process, and thus, although the display device is relatively thicker, the requirement for the process level can be reduced.
It can be seen that the infrared light source, the sensing layer and the optical structure layer in the embodiment of the disclosure can cooperatively detect the position where infrared light is reflected on the touch surface to be detected, so as to realize the detection of the finger surface when the finger is close to the display device. Compared with the depth detection technology which needs to use a camera device, the depth detection method provided by the embodiment of the disclosure does not need to introduce an image processing module or a complex CMOS device manufacturing process, and the required structure and the manufacturing process are simpler.
It should be noted that, the display device in the embodiment of the present disclosure may be: any product or component with a display function, such as a display panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Fig. 6 is a flowchart illustrating a touch detection method of a display device according to an embodiment of the present disclosure. The display device may be any one of the above display devices. Referring to fig. 6, the method may include the following process flow.
In step 601, an infrared light source is controlled to provide infrared illumination to a touch surface.
In step 602, a first distance detected by each of the plurality of infrared sensors is obtained.
In step 603, for each infrared sensor, a position point where infrared light reaching the infrared sensor is reflected on the touch surface to be detected is determined from the first distance, the second distance, and the reception angle.
Wherein the infrared light source is located outside a display area of the display device. The plurality of infrared sensors are distributed in the display area of the display device, the first distance is a transmission distance from the infrared light source to the infrared sensors after the infrared light is reflected on the touch surface to be detected, the incident angle of the infrared light reaching each infrared sensor is limited by a corresponding optical structure, and each optical structure is located on one side of the display device in the thickness direction of the corresponding infrared sensor. The second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
In one possible implementation, the infrared light source includes at least two light emitting elements surrounding a display area of the display device; correspondingly, the providing infrared light illumination to the touch surface by an infrared light source comprises: controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element; correspondingly, the touch detection method further comprises the following steps: and integrating the detection results respectively corresponding to each light-emitting element to obtain the detection result of the touch surface to be detected.
It should be understood that the above description already includes alternative implementations of the method of the present embodiment and related descriptions, and therefore, the detailed description is not repeated here.
Fig. 7 is a block diagram of a touch detection device of a display apparatus according to an embodiment of the present disclosure. Referring to fig. 7, the display device may be any one of the above-described display devices. Referring to fig. 7, the touch detection apparatus may include the following structure.
And a light emission control module 71 for controlling an infrared light source to provide infrared light illumination to the touch surface, the infrared light source being located outside the display area of the display device.
The detecting module 72 is configured to obtain a first distance detected by each of a plurality of infrared sensors, where the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance from the infrared light source to the infrared sensor after the infrared light is reflected on the touch surface to be detected, an incident angle of the infrared light reaching each infrared sensor is limited by a corresponding optical structure, and each optical structure is located on one side of the display device in a thickness direction of the corresponding infrared sensor.
A processing module 73, configured to determine, for each infrared sensor, a position point where infrared light reaching the infrared sensor is reflected on the touch surface to be detected, according to the first distance, the second distance, and the receiving angle; wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
In one possible implementation, the infrared light source includes at least two light emitting elements surrounding a display area of the display device; correspondingly, the light control module 71 is further configured to: controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element; correspondingly, the device further comprises: and the integration module is used for integrating the detection results respectively corresponding to each light-emitting element so as to obtain the complete detection result of the touch surface to be detected.
It should be understood that the above includes alternative implementations and related descriptions of the touch detection device of the present embodiment, and therefore, the detailed description is omitted here.
Fig. 8 is a block diagram of a touch detection device of a display apparatus according to still another embodiment of the present disclosure. Referring to fig. 8, the display device may be any one of the above-described display devices. Referring to fig. 8, the touch detection device may include a processor 81 and a memory 82 for storing processor-executable instructions. The processor 81 is configured to call program instructions in the memory 82 to perform any one of the above-mentioned touch detection methods of the display device.
The processor 81 may include a central processing unit (CPU, single or multi-core), a Graphics Processing Unit (GPU), a microprocessor, an Application-Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, or a plurality of Integrated circuits for controlling program execution.
The Memory 82 may include, but is not limited to, a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate or integrated with the processor.
Embodiments of the present disclosure also provide a computer storage medium for storing a computer program for use in any one of the above-described touch detection methods of a display device, the computer program including program instructions. Any one of the above-described touch detection methods of the display device provided by the present disclosure may be implemented by executing a stored program.
It can be seen that the infrared light source, the sensing layer and the optical structure layer in the embodiment of the disclosure can cooperatively detect the position where infrared light is reflected on the touch surface to be detected, so as to realize the detection of the finger surface when the finger is close to the display device. Compared with the depth detection technology which needs to use a camera device, the depth detection method provided by the embodiment of the disclosure does not need to introduce an image processing module or a complex CMOS device manufacturing process, and the required structure and the manufacturing process are simpler.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (14)
1. A display device, characterized in that the display device comprises:
the infrared light source is positioned outside the display area of the display device and used for providing infrared light illumination for the touch surface to be detected;
the sensing layer comprises a plurality of infrared sensors distributed in the display area, and the infrared sensors are used for detecting a first distance, wherein the first distance is a transmission distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected;
the optical structure layer is positioned on at least one side in the thickness direction of the sensing layer and comprises a plurality of optical structures, each optical structure is positioned on one side in the thickness direction of one corresponding infrared sensor, and the optical structures are used for limiting the incident angle of infrared light reaching the corresponding infrared sensor, so that the position point of reflection of the infrared light reaching the infrared sensor on the touch surface to be detected can be determined based on the first distance, a second distance and a receiving angle, wherein the second distance is the distance between the infrared sensor and the infrared light source, and the receiving angle is the incident angle of the infrared light received by the infrared sensor limited by the optical structures.
2. The display device of claim 1, wherein the infrared light source comprises at least two light emitting elements surrounding a display area of the display device.
3. The display device according to claim 2, wherein the infrared light source further comprises a light emission control circuit connected to each of the light emitting elements, respectively, the light emission control circuit being configured to control the at least two light emitting elements to emit light one by one in each detection period.
4. The display device according to claim 1, further comprising touch circuitry, each of the infrared sensors being connected to the touch circuitry,
the touch control circuit is used for determining a position point of infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle respectively for each infrared sensor.
5. The display device according to claim 1, wherein the display device comprises an organic light emitting layer including a plurality of light emitting patterns located within the display area;
in the plane of the display device, at least one part of the orthographic projection of each infrared sensor is positioned between the orthographic projections of the two adjacent luminous patterns.
6. The display device according to claim 5, wherein the orthographic projection of each infrared sensor is positioned between the orthographic projections of two adjacent luminous patterns in the plane of the display device.
7. The display device according to any one of claims 1 to 6, further comprising a first substrate, a second substrate, and an organic light-emitting layer, wherein the organic light-emitting layer, the optical structure layer, and the sensor layer are sequentially stacked between the first substrate and the second substrate.
8. The display device according to claim 7, wherein the infrared light source and the organic light emitting layer are located in the same layer between the first substrate and the second substrate.
9. The display device according to any one of claims 1 to 6, further comprising a first substrate, a second substrate, a third substrate, and an organic light emitting layer, wherein the second substrate is located between the first substrate and the third substrate, the organic light emitting layer is located between the first substrate and the second substrate, and the optical structure layer and the sensing layer are located between the second substrate and the third substrate.
10. A method of touch detection for a display device, the method comprising:
controlling an infrared light source to provide infrared light illumination for a touch surface to be detected, wherein the infrared light source is positioned outside a display area of the display device;
acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, wherein the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected, the incident angle of the infrared light which reaches each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
determining a position point of the infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle, aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
11. The method of claim 10, wherein the infrared light source comprises at least two light emitting elements surrounding a display area of the display device;
correspondingly, the providing infrared light illumination to the touch surface by an infrared light source comprises:
controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element;
correspondingly, the method further comprises the following steps:
and integrating the detection results respectively corresponding to each light-emitting element to obtain the detection result of the touch surface to be detected.
12. A touch detection apparatus of a display device, characterized in that the apparatus comprises:
the light emitting control module is used for controlling an infrared light source to provide infrared light illumination for the touch surface to be detected, and the infrared light source is positioned outside a display area of the display device;
the detection module is used for acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance from an infrared light source to the infrared sensor after the infrared light is reflected on the touch surface to be detected, an incident angle of the infrared light reaching each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
the processing module is used for determining a position point of infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle respectively aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
13. The apparatus of claim 12, wherein the infrared light source comprises at least two light emitting elements surrounding a display area of the display device;
correspondingly, the light emission control module is further configured to:
controlling the at least two light-emitting elements to emit light one by one in each detection period so as to obtain detection results respectively corresponding to each light-emitting element;
correspondingly, the device further comprises:
and the integration module is used for integrating the detection results respectively corresponding to each light-emitting element so as to obtain the complete detection result of the touch surface to be detected.
14. A touch detection apparatus of a display device, characterized in that the apparatus comprises:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to:
controlling an infrared light source to provide infrared light illumination for a touch surface to be detected, wherein the infrared light source is positioned outside a display area of the display device;
acquiring a first distance detected by each infrared sensor in a plurality of infrared sensors, wherein the plurality of infrared sensors are distributed in the display area of the display device, the first distance is a propagation distance of infrared light which starts from the infrared light source and reaches the infrared sensors after being reflected on the touch surface to be detected, the incident angle of the infrared light which reaches each infrared sensor is limited by a corresponding optical structure, and each optical structure is positioned on one side of the display device in the thickness direction of the corresponding infrared sensor;
determining a position point of the infrared light reaching the infrared sensor, which is reflected on the touch surface to be detected, according to the first distance, the second distance and the receiving angle, aiming at each infrared sensor;
wherein the second distance is a distance between the infrared ray sensor and the infrared light source, and the reception angle is an incident angle of infrared light received by the infrared ray sensor limited by the optical structure.
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| CN201910330439.3A CN110058742B (en) | 2019-04-23 | 2019-04-23 | Display device, touch detection method and device |
| PCT/CN2020/076799 WO2020215885A1 (en) | 2019-04-23 | 2020-02-26 | Display device, and touch detection method and device |
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| CN110058742B (en) * | 2019-04-23 | 2021-01-26 | 京东方科技集团股份有限公司 | Display device, touch detection method and device |
| CN111078045A (en) * | 2019-11-29 | 2020-04-28 | 京东方科技集团股份有限公司 | Display device and touch detection method thereof |
| CN112527156B (en) * | 2020-12-25 | 2022-04-12 | 广州长嘉电子有限公司 | Infrared multi-point touch identification method, device and system based on conference tablet |
| CN112882594B (en) * | 2020-12-31 | 2023-12-22 | 安徽鸿程光电有限公司 | Touch device, positioning method, device and medium |
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