Patent Publication Number: US-2017351384-A1

Title: Touch display system and correciton method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 201610382363.5, filed on Jun. 2, 2016. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a display system, and particularly relates to a touch display system and a correction method thereof. 
     Description of Related Art 
     Along with development of electronic science and technology, electronic devices are often used to execute a plurality of tasks in people&#39;s daily life, and to use a touch screen as a man-machine operation interface has become the most commonly used method. 
     In a large-size touch display system, it often needs to correct a display region provided by a display device and a touch region provided by a touch device, such that a frame displayed by the display device may correctly reflect a touch operation received by the touch device, so as to facilitate smooth interaction between a user and the touch display system. However, as a display frame of the touch display device becomes more and more large, an existing correction method takes too much time, and correction accuracy thereof cannot satisfy user&#39;s demand. 
     The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the invention was acknowledged by a person of ordinary skill in the art. 
     SUMMARY OF THE INVENTION 
     The invention is directed to a touch display system and a correction method thereof, by which a correction time of touch points is effectively saved, and correction accuracy of the touch points is improved. 
     Other objects and advantages of the invention can be further illustrated by the technical features broadly embodied and described as follows. 
     In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides a touch display system including a touch display device, an image capturing device and a processing device. The touch display device has a touch display surface, and the touch display surface is configured to display a correction image. The touch display surface has an electrode circuit layer and an alignment arrangement disposed on the electrode circuit layer, where the alignment arrangement has a plurality of mark patterns used for forming a plurality of alignment regions. The electrode circuit layer has a plurality of electrode sensing regions, and each of the alignment regions and each of the electrode sensing regions have a predetermined proportion relationship there between. The image capturing device captures the correction image and the mark patterns to generate a capturing image. The processing device is coupled to the touch display device and the image capturing device, and corrects a position corresponding relationship between the correction image and each of the alignment regions on the touch display surface according to the capturing image. 
     In embodiment of the invention provides a correction method of a touch display system, which includes following steps. A correction image is displayed on a touch display surface of the touch display system, where the touch display surface has an electrode circuit layer and an alignment arrangement disposed on the electrode circuit layer, where the alignment arrangement has a plurality of mark patterns used for forming a plurality of alignment regions, the electrode circuit layer has a plurality of electrode sensing regions, and each of the alignment regions and each of the electrode sensing regions have a predetermined proportion relationship there between. The correction image and the mark patterns are captured to generate a capturing image. A position corresponding relationship between the correction image and each of the alignment regions on the touch display surface is corrected according to the capturing image. 
     According to the above descriptions, in the embodiments of the invention, the correction image is displayed on the touch display surface of the touch display system, where the touch display surface has the electrode circuit layer and the alignment arrangement disposed on the electrode circuit layer, the alignment arrangement has a plurality of mark patterns used for forming a plurality of alignment regions. The electrode circuit layer has a plurality of electrode sensing regions, and each of the alignment regions and each of the electrode sensing regions have the predetermined proportion relationship there between. By correcting the position corresponding relationship between the correction image and each of the alignment regions on the touch display surface according to the capturing image including the correction image and the mark patterns, a time required for correcting touch points is effectively saved, and correction accuracy of the touch points is improved. 
     Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention. 
     In order to make the aforementioned and other features and advantages of the invention comprehensible, several exemplary embodiments accompanied with figures are described in detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a schematic diagram of a touch display system according to an embodiment of the invention. 
         FIG. 2  is a partial schematic diagram of a touch display device according to an embodiment of the invention. 
         FIG. 3  is a schematic diagram of an alignment arrangement and a correction image on a touch display surface according to an embodiment of the invention. 
         FIG. 4  is a schematic diagram of mark patterns and a correction image on a touch display surface according to an embodiment of the invention. 
         FIG. 5  is a schematic diagram of mark patterns and a correction image on a touch display surface according to an embodiment of the invention. 
         FIG. 6  is a schematic diagram of a touch display system according to another embodiment of the invention. 
         FIG. 7A  is a schematic diagram of a touch display system according to still another embodiment of the invention. 
         FIG. 7B  is a partial schematic diagram of a touch display device according to another embodiment of the invention. 
         FIG. 8  is a flowchart illustrating a correction method of a touch display system according to an embodiment of the invention. 
         FIG. 9  is a flowchart illustrating a correction method of a touch display system according to another embodiment of the invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     It is to be understood that other embodiment may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted,” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. 
       FIG. 1  is a schematic diagram of a touch display system according to an embodiment of the invention. Referring to  FIG. 1 , the touch display system  100  includes a touch display device  102 , an image capturing device  104  and a processing device  106 , where the processing device  106  is coupled to the touch display device  102  and the image capturing device  104 . The touch display device  102  has a touch display surface  108 , and the touch display surface  108  is configured to display a correction image, and the touch display surface  108  has an electrode circuit layer and an alignment arrangement disposed on the electrode circuit layer. Further, referring to  FIG. 2 ,  FIG. 2  is a partial schematic diagram of a touch display device according to an embodiment of the invention. The touch display device  102  may include an electrode circuit layer  112  having a plurality of transmitting electrode circuits TX and a plurality of receiving electrode circuits RX, and the alignment arrangement includes a plurality of cross-shape mark patterns P 1 , which are respectively located at intersections of the transmitting electrode circuits TX and the receiving electrode circuits RX to coincide with the transmitting electrode circuits TX and the receiving electrode circuits RX. The transmitting electrode circuits TX and the receiving electrode circuits RX are, for example, made of gold, silver, copper, nano carbon tube, indium tin oxide, or other proper conductive materials, though the invention is not limited thereto. 
     In the embodiment, every four mark patterns P 1  encircles an alignment region A 1 , and the transmitting electrode circuits TX and the receiving electrode circuits RX form a plurality of electrode sensing regions A 2 . An area of each of the alignment regions A 1  and an area of each of the electrode sensing regions A 2  have a predetermined proportion relationship there between. In the present embodiment, the predetermined proportion relationship is 1:1, though the invention is not limited thereto. In some embodiments, the predetermined proportion relationship can also be 1:1.5, 1:2, 1:2.5, 1:3 or other proper proportion relationships. Moreover, shapes of the aforementioned mark patterns P 1  can also be other shapes, for example, circles, triangles, rhombuses, rectangles, or other proper shapes. Shapes of the alignment regions A 1  and the electrode sensing regions A 2  are not limited to rectangles, but can also be parallelograms, rhombuses, triangles, or other proper shapes. The alignment regions A 1  and the electrode sensing regions A 2  are unnecessary to be completely coincided or have a same size. A distance between each two of the mark patterns P 1  can be changed according to an actual application requirement, for example, the distance between the mark patterns P 1  can be enlarged to save a usage amount of a material used for manufacturing the mark patterns P 1 . Namely, as long as a relative position relationship between the alignment regions A 1  and the electrode sensing regions A 2  is fixed, it can be used for implementing the alignment arrangement and the electrode circuit layer of the embodiment. 
     Moreover, the image capturing device  104  of the embodiment is, for example, a charge-coupled device (CCD), a complementary metal-oxide-semiconductor (CMOS) or other suitable electronic device. The processing device  106  is, for example, a personal computer (PC), a notebook computer, a tablet PC, a smart phone, a server, a chipset integrated into the touch display device  102  or other suitable electronic device, a single core or multi-core central processing unit (CPU), etc., which is not limited by the invention. 
       FIG. 3  is a schematic diagram of an alignment arrangement and a correction image in a capturing image according to an embodiment of the invention. Referring to  FIG. 1  to  FIG. 3 , the correction image I 1  may include a plurality of correction patterns M 1 , and in the embodiment, each correction pattern M 1 , for example, has a cross shape, though the invention is not limited thereto, and each correction pattern M 1  can also be a circle, triangle, a rhombus, a rectangle, a ring, a star or other proper shapes. The image capturing device  104  captures an image of the touch display surface  108  to generate a capturing image  110 . The content of the capturing image  110 , for example, includes the plurality of correction patterns M 1  and the plurality of mark patterns P 1 , and the processing device  106  may correct a position corresponding relationship between the correction patterns M 1  in the correction image I 1  and each of the alignment regions A 1  on the touch display surface  108  according to the capturing image  110 . Further, the processing device  106  may correct a position corresponding relationship between a vertex T 1  of the correction image I 1  and the corresponding one of the alignment regions A 1  according to the capturing image  110 , or correct the position corresponding relationship between each of the correction patterns M 1  and the corresponding one of the alignment regions A 1  according to a coordinate position of each of the correction patterns M 1  of the capturing image  110  in the corresponding alignment region A 1 . 
     In this way, by correcting the position corresponding relationship between the correction image I 1  and each of the alignment regions A 1  on the touch display surface  108  according to the capturing image  110  generated by capturing the correction image I 1  and the mark patterns P 1 , a time required for correcting touch points is effectively saved, and correction accuracy of the touch points is improved, where the higher a distribution density of the correction patterns M 1  and the mark patterns P 1  is, the higher the correction accuracy is. 
     For example,  FIG. 4  is a schematic diagram of mark patterns and a correction image according to an embodiment of the invention. Referring to  FIG. 4 , in the embodiment, a position of the vertex T 1  of the correction image I 1  can be corrected according to the alignment region A 1  formed by the mark patterns P 1 A, P 1 B, P 1 C, P 1 D. For example, coordinates of the mark patterns P 1 A, P 1 B, P 1 C and P 1 D are respectively (0,0), (0,10), (10,10), and (10,0), such that the alignment region A 1  is divided into 10×10 coordinate points, and the processing device  106  obtains corresponding coordinate (1,4) of the vertex T 1  in the alignment region A 1  according to the capturing image  110 . In this way, in the alignment region A 1  formed by the mark patterns P 1 A, P 1 B, P 1 C and P 1 D, the processing device  106  may take the coordinate of the vertex T 1  as a reference to obtain corresponding coordinates of positions of the correction image I 1  on the alignment region A 1 , so as to effectively correct the position corresponding relationship between each position of the correction image I 1  and each of the alignment regions A 1 . 
       FIG. 5  is a schematic diagram of mark patterns and a correction image according to an embodiment of the invention. Referring to  FIG. 5 , in the embodiment, a position of a correction pattern M 1 ′ can be corrected according to alignment region A 1 ′ formed by mark patterns P 1 E, P 1 F, P 1 G and P 1 H. For example, coordinates of the mark patterns P 1 E, P 1 F, P 1 G and P 1 H are respectively (0,20), (10,30), (0,30), and (10,20), such that the alignment region A 1 ′ is divided into 10×10 coordinate points, and the processing device  106  obtains corresponding coordinate (7,21) of the correction pattern M 1 ′ in the alignment region A 1 ′ according to the capturing image  110 . In this way, in the alignment region A 1 ′ formed by the mark patterns P 1 E, P 1 F, P 1 G and P 1 H, the processing device  106  may take the coordinate of the correction pattern M 1 ′ as a reference to obtain corresponding coordinate of each position of the correction image I 1  on the alignment region A 1 ′, so as to effectively correct the position corresponding relationship between each position of the correction image I 1  and each of the alignment regions A 1 ′. 
     It should be noted that the invention is not limited to implement alignment of the correction patterns M 1  or M 1 ′ of  FIG. 4  and  FIG. 5  in the alignment region A 1  or A 1 ′ according to the aforementioned implementations, and other existing algorithms of the technical field can also be adopted to calculate the coordinates of correction patterns M 1  (or M 1 ′) in the alignment region A 1  (or A 1 ′). Moreover, the mark patterns P 1  of the aforementioned embodiment are, for example, invisible light patterns. Further, the invisible light patterns (for example, fabricated through infrared invisible ink or ultraviolet invisible ink, though the invention is not limited thereto) can be coated on the touch display surface  108  through a screen printing process. 
       FIG. 6  is a schematic diagram of a touch display system according to another embodiment of the invention. Referring to  FIG. 6 , compared to the touch display system  100 , the touch display system  600  of the embodiment is similar to the touch display system  100 , and a main difference there between is that the touch display system  600  further includes an invisible light source  602 . The invisible light source  602  may provide an invisible light IV corresponding to an ink material of the mark patterns P 1 . For example, in case that the mark patterns P 1  are implemented by the infrared invisible ink, when the image capturing device  104  captures an image of the mark patterns P 1 , the invisible light source  602  capable of emitting an infrared light provides the infrared light to irradiate the touch display surface to emerge the mark patterns P 1 . Moreover, in case that the mark patterns P 1  are implemented by the ultraviolet invisible ink, the invisible light source  602  capable of emitting an ultraviolet light provides the ultraviolet light to irradiate the touch display surface to emerge the mark patterns P 1  and meanwhile sterilize the touch display surface  108 , which is not limited by the invention. The image capturing device  104  may perform an image capturing operation when the touch display surface  108  displays the correction image I 1  and the invisible light source  602  provides the invisible light to irradiate the touch display surface  108 , so as to simultaneously capture the correction image I 1  and the mark patterns P 1 . Then, the processing device  106  may correct the position corresponding relationship between the correction image I 1  and each of the alignment regions A 1  according to the captured capturing image. 
     Moreover, in some embodiments, the image capturing device  104  may respectively perform image capturing operation in tandem when the touch display surface  108  displays the correction image I 1  and when the invisible light source  602  provides the invisible light to irradiate the touch display surface  108 , and then the processing device  106  corrects the position corresponding relationship between the correction image I 1  and each of the alignment regions A 1  according to the two capturing images. Moreover, a color of the correction patterns M 1  (or M 1 ′) in the correction image I 1  can be different to a color of the emerged mark patterns P 1 , so as to increase distinctiveness of the correction patterns M 1  (or M 1 ′) and the mark patterns P 1 , though the invention is not limited thereto. 
       FIG. 7A  is a schematic diagram of a touch display system according to still another embodiment of the invention, and  FIG. 7B  is a partial schematic diagram of a touch display device according to another embodiment of the invention. Referring to  FIG. 7A , the touch display system  700  is similar to the touch display system  600  of  FIG. 6 , and a main difference there between is that the touch display device in the touch display system  700  includes a projection screen  702  and a projection device  704 . The projection screen  702  and the projection device  704  are respectively coupled to the processing device  106 . The projection screen  702  is, for example, a capacitive touch projection screen, an electromagnetic touch projection screen, a resistive touch projection screen or other proper touch projection screen, and the projection screen  702  is used for receiving an image beam IB projected by the projection device  704  to display the correction image I 1  and implement a touch sensing operation. 
     Further, referring to  FIG. 7A  and  FIG. 7B , the projection screen  702  may include reflection layer  710  and an electrode circuit layer  712 , where the reflection layer  710  is disposed on the electrode circuit layer  712  (in  FIG. 7B , only a part of the reflection layer  710  covering the electrode circuit layer  712  is schematically illustrated, and the reflection layer  710  may completely cover the electrode circuit layer  712 ), so as to receive the image beam IB and display the correction image I 1 , and the electrode circuit layer  712  is coupled to the processing device  106  for sensing a touch operation. A surface of the reflection layer  710  presents a white color, for example, a white coating such as TiO2, etc., is mixed into a transparent substrate (made of, for example, PET, epoxy resin or other proper material), or the white coating is directly coated on a transparent substrate (made of, for example, PET, glass or other proper material), though the invention is not limited thereto. Moreover, the mark patterns P 1  of the alignment arrangement are for example, coated on the reflection layer  710  through a screen printing process. The reflection layer  710  and the mark patterns P 1  of the alignment arrangement can be respectively fabricated through different fabrication processes. When the mark patterns P 1  of the alignment arrangement are coated, by aligning the reflection layer  710  and alignment marks (not shown) on a screen printing fixture, the mark patterns P 1  of the alignment arrangement can be coated on the reflection layer corresponding to positions of the intersections between the transmitting electrode circuits TX and the receiving electrode circuits RX on the electrode circuit layer  712 . The mark patterns P 1  of the alignment arrangement, the reflection layer  710  and the electrode circuit layer  712  can be simultaneously formed through a roll to roll process or other proper methods, which is not limited by the invention. When the image capturing device  104  captures an image of the mark patterns P 1 , the invisible light source  602  provides the invisible light IV to irradiate the touch display surface to emerge the mark patterns P 1 . The image capturing device  104  may simultaneously capture the correction image I 1  and the mark patterns P 1  or capture the same in tandem, and the processing device  106  may correct the position corresponding relationship between the correction image I 1  and each of the alignment regions A 1  according to the captured capturing image (similar to the capturing image  110  shown in  FIG. 3  and  FIG. 4 ). Since touch position correction can be independently performed to each of the alignment regions A 1  when a projected image on the reflection layer  710  has an image skew problem due to unevenness of the projection screen  702  or due to a projection angle of the image beam IB of the projection device  704 , the problem of inaccurate touch position correction caused by skew of the projected image can be greatly mitigated. 
       FIG. 8  is a flowchart illustrating a correction method of a touch display system according to an embodiment of the invention. Referring to  FIG. 8 , according to the aforementioned embodiments, it is known that the correction method of the touch display system may include following steps. First, a correction image is displayed on a touch display surface of the touch display system (step S 802 ), where the touch display surface has an electrode circuit layer and an alignment arrangement disposed on the electrode circuit layer, the alignment arrangement has a plurality of mark patterns used for forming a plurality of alignment regions, the electrode circuit layer has a plurality of electrode sensing regions, and each of the alignment regions and each of the electrode sensing regions have a predetermined proportion relationship there between. The correction image is, for example, displayed by a touch display panel, or displayed by a projection screen by receiving an image beam projected by a projection device, where the projection screen is, for example, a capacitive touch projection screen, an electromagnetic touch projection screen, a resistive touch projection screen or other proper touch projection screen, and the projection screen can be used for sensing a touch operation. Further, the projection screen may include a reflection layer and an electrode circuit layer, where the reflection layer is disposed on the electrode circuit layer for receiving the image beam to display the correction image, and the electrode circuit layer is used for sensing the touch operation. Moreover, the mark patterns of the alignment arrangement are, for example, coated on the reflection layer through a screen printing process. Then, the correction image and the mark patterns are captured to generate a capturing image (step S 804 ), where the correction image includes a plurality of correction patterns, and the correction image and the mark patterns can be simultaneously captured or captured in tandem. Thereafter, a position corresponding relationship between the correction image and each of the alignment regions on the touch display surface is corrected according to the capturing image (step S 806 ), for example, the position corresponding relationship between the correction image or the correction patterns and each of the alignment regions is corrected according to a vertex of the correction image or a coordinate position of each of the correction patterns in the corresponding alignment region. 
       FIG. 9  is a flowchart illustrating a correction method of a touch display system according to another embodiment of the invention. Referring to  FIG. 9 , the correction method of the touch display system of the embodiment is similar to the correction method of  FIG. 8 , and a difference there between is that the mark patterns of the embodiment are invisible light patterns, so that a step S 902  is further included between the step S 802  and the step S 804 , i.e. an invisible light is provided to irradiate the touch display surface to emerge the mark patterns. 
     In summary, the correction image is displayed on the touch display surface of the touch display system, where the touch display surface has the electrode circuit layer and the alignment arrangement disposed on the electrode circuit layer, the alignment arrangement has a plurality of mark patterns used for forming a plurality of alignment regions. The electrode circuit layer has a plurality of electrode sensing regions, and each of the alignment regions and each of the electrode sensing regions have the predetermined proportion relationship there between. By correcting the position corresponding relationship between the correction image and each of the alignment regions on the touch display surface according to the capturing image including the correction image and the mark patterns, a time required for correcting touch points is effectively saved, and correction accuracy of the touch points is improved. Moreover, in case that the correction image is a projection image, the problem of inaccurate touch position correction caused by skew of the projected image can be greatly mitigated. 
     The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.