JP4429124B2 - Display device with touch input function - Google Patents

Description

  The present invention relates to a display device having a touch input function.

  A panel type input device known by the name of a touch panel is an auxiliary input device in a data processing device having a display device such as a personal computer, a personal digital assistant (PDA), an automatic teller machine (ATM), etc. When the operator touches a desired position on the surface with a pen or a finger, the two-dimensional coordinate data required for the display device is input and instructed. In particular, touch panels having a transparent structure that can be installed on a screen of a display device such as an LCD (liquid crystal display), a PDP (plasma panel), or a CRT (CRT) are widely used.

  Conventional touch panels are known to have optical, ultrasonic, electrostatic capacitance, resistive film type, etc., if classified by touch position detection method. Of these, the resistive touch panel is particularly advantageous in portable devices such as PDAs because it has a simple detection mechanism and is easy to miniaturize compared to other methods. However, since the resistive touch panel is composed of two transparent substrates, the drawing quality of the display device, such as the brightness and contrast of the screen, deteriorates when placed on the screen of the display device. There is concern about making it happen.

  Instead of the above-described configuration in which the touch panel is placed on the screen of the display device, a display device with a touch input function in which both functions of the display device and the touch panel are provided on a common substrate has been proposed. For example, Patent Document 1 discloses a touch panel in which a plurality of photoelectric conversion elements such as photodiodes are regularly mixed in a matrix electrode array of pixel electrodes included in a liquid crystal panel. This touch panel displays an image with a liquid crystal panel structure, while reflecting the light of a backlight for liquid crystal display at the tip of a pen that touches and inputs a desired position on the surface of the panel, and the surrounding photoelectric conversion elements reflect this reflected light. The touch position is detected by receiving light.

  Patent Document 2 discloses a panel type information device in which EL elements and photoelectric conversion elements (photodiodes) are mixedly arranged in a matrix on one substrate. In this information device as well, while the EL element group displays an image, the display light of the EL element is reflected by the tip of a pen for touch-inputting a desired position on the panel surface, and the surrounding photoelectric conversion elements receive this reflected light. Thus, the touch position is detected.

Japanese Patent Laid-Open No. 11-11998 JP 2002-287900 A

  Since the conventional display device with a touch input function described above realizes both the display function and the touch input function with a single substrate, the touch panel is arranged on the screen of the display device in a layered manner. It is expected to promote downsizing and height reduction. On the other hand, since the photoelectric conversion element receives reflected light of display light such as a liquid crystal backlight or EL element, the touch position is detected. Therefore, scattered light of display light becomes noise and position detection accuracy is improved. There is a risk that it will decrease or malfunction due to external light when used under strong external light such as sunlight. In addition, there is a concern that a decrease in the amount of detected light due to deterioration of the backlight and EL elements (that is, deterioration of the display function) directly leads to a decrease in position detection accuracy. Furthermore, since it is premised on the installation of a backlight and the use of self-luminous elements such as EL elements, it is difficult to apply to display devices (for example, reflective LCDs, electronic papers, etc.) that display images using external light. .

  An object of the present invention is to provide a display device with a touch input function in which a display function and a touch input function are incorporated in a common substrate, and malfunctions due to external light even when used under strong external light such as sunlight. It is possible to maintain position detection accuracy even if the display function is deteriorated, and can be applied regardless of the configuration of the image display mechanism such as a transmissive LCD, a reflective LCD, an EL element, and an LED. An object of the present invention is to provide a display device with a touch input function that is excellent in reliability and developability.

To achieve the above object, the invention described in claim 1 includes a substrate, a plurality of cell portions provided on the substrate and defining a screen area, a plurality of display elements provided in association with the cell portions, and In a display device with a touch input function, comprising: a plurality of light detection elements; and a processing unit that identifies a touch input coordinate position in a screen area based on light detected by the light detection elements. Rutotomoni can detect external light incident from the outside of the screen area, can detect the intensity and spectrum of light, the processing section of the light detecting element detecting the partial shadow of external light, the position in the screen area, the touch input as well as processed as the coordinate position, based on the intensity and spectrum of light the light-detecting element has detected, touch input device, wherein the identifying the display light according to each of the external light and the display device Attached to provide a display device.

  According to a second aspect of the present invention, in the display device with a touch input function according to the first aspect of the present invention, the display light that is extended between the plurality of cell portions along the surface of the substrate is detected by each of the display elements. Provided is a display device with a touch input function, which further includes a barrier for preventing light from entering each element.

  According to a third aspect of the present invention, in the display device with a touch input function according to the first or second aspect, the transparent plate disposed opposite to the substrate and the reflection of display light by the plurality of display elements are provided on the transparent plate. Provided is a display device with a touch input function, further comprising an antireflection layer for preventing the above.

A fourth aspect of the present invention is the display device with a touch input function according to any one of the first to third aspects, wherein a plurality of photodetecting elements and desired cell units individually associated with the photodetecting elements are provided. A display device with a touch input function is further provided, which further includes a plurality of light guide members that are disposed between and guide the external light incident on a desired cell portion to the related light detection elements.

The invention according to claim 5 is the display device with a touch input function according to any one of claims 1 to 3 , wherein the first light guide path is formed between the plurality of cell units and the plurality of display elements. And a second light guide path formed between the plurality of cell units and the plurality of light detection elements, and a switching member that switches the first light guide path and the second light guide path to each other as necessary. A display device with an input function is provided.

A sixth aspect of the present invention is the display device with a touch input function according to any one of the first to fifth aspects, wherein the processing unit has a predetermined time with respect to the light detection element that detects a local shadow of external light. There is provided a display device with a touch input function that determines whether or not there is a change in a local shadow and processes the position of a light detection element that detects the local shadow as a touch input coordinate position when there is a change.

According to a seventh aspect of the present invention, in the display device with a touch input function according to the first aspect, each of the light detection elements can detect reflected light of the display light by each of the display elements, and the processing unit Touch that selects one of the position of the light detection element that detects the local shadow of the screen and the position of the light detection element that detects the reflected light of the display light in the screen area, and processes it as the touch input coordinate position A display device with an input function is provided.

According to the first aspect of the present invention, since both the display function and the touch input function can be realized with a single substrate, the size of the display can be further reduced compared to the configuration in which the touch panel is arranged on the screen of the display device. A reduction in height can be promoted. In addition, a plurality of light detection elements arranged in the screen area of the substrate detect a local shadow of external light incident on the screen area, and the processing unit processes the position of the local shadow as a touch input coordinate position. Therefore, even when used under strong external light such as sunlight, the risk of malfunction due to external light is surely eliminated. Further, even if the amount of display light decreases due to deterioration of the display function of the display element, the position detection accuracy is not affected. Furthermore, since installation of a backlight and use of a self-light-emitting element are not essential requirements, it can be applied to a display device (for example, a reflective LCD, electronic paper, etc.) that displays an image using external light. Therefore, according to the present invention, there is provided a display device with a touch input function which is applicable regardless of the configuration of the image display mechanism, such as a transmissive LCD, a reflective LCD, an EL element, and an LED, and which has excellent reliability and expandability. .
In addition, the processing unit determines that the detection light from the light detection element is a local shadow of external light and touches it only when the spectrum of the detection light acquired from the light detection element is not related to the spectrum of the display light. Since the input coordinate position can be specified, it is possible to prevent malfunction of touch input when a change in display light by the display element is detected.

  According to the second aspect of the present invention, the plurality of barriers extending between the plurality of cell portions act to prevent the display light from each display element from entering the adjacent photodetector. Therefore, it is possible to prevent the detection accuracy of the touch input position from being lowered due to the scattered light or reflected light of the display light becoming noise.

  According to the third aspect of the present invention, the antireflection layer formed on the transparent plate acts to prevent a decrease in the detection accuracy of the touch input position due to the reflected light of the display light.

According to the fourth aspect of the present invention, the manufacture of the substrate is facilitated.

According to the invention described in claim 5, together with the fabrication of the substrate is facilitated, without degrading the image display resolution by the display device, we are possible to improve the touch position detection accuracy of the light detecting element.

According to the sixth aspect of the present invention, the processing unit does not treat the local shadow of the external light caused by the presence of foreign matter or dirt as coordinate input data, and the local shadow of the external light is touched by the operator. The coordinate input process can be performed only when it occurs due to an input operation.

According to the seventh aspect of the present invention, when the display device with a touch input function is used in a situation where the external light is weak and it is difficult to detect the local shadow, the reflected light of the display light is detected from the method of detecting the local shadow. It can be used by switching to a method for detecting.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Corresponding components are denoted by common reference symbols throughout the drawings.
Referring to the drawings, FIG. 1 is a schematic diagram showing a display device 10 with a touch input function (hereinafter abbreviated as a display device 10) according to an embodiment of the present invention using functional blocks, and FIG. 2 is a display device. FIG. 3 is a schematic plan view illustrating the touch position detection function of the display device 10.

  The display device 10 includes a rectangular thin plate-like substrate 12, a plurality of cell portions 16 provided on the substrate 12 and defining a screen area 14 having a desired area, and a plurality of display elements 18 provided in association with the cell portions 16. And a plurality of light detection elements 20 and an input processing unit 22 that specifies the touch input coordinate position in the screen region 14 based on the light detected by the light detection elements 20. The plurality of cell portions 16 are arranged in a matrix on the substrate 12 to define a screen region 14 that is substantially rectangular in plan view. A plurality (predetermined number) of display elements 18 and a plurality (predetermined number) of photodetecting elements 20 are provided in a regular and dispersed manner in a staggered alternate arrangement directly on each cell unit 16 (FIG. 2). . In each drawing, the cell portion 16 is shown in a sufficiently enlarged manner to help understanding.

  Each display element 18 has a pixel structure of an LCD (liquid crystal display). That is, a known pixel component (not shown) such as an electrode, a liquid crystal, and a switching element is installed in each cell unit 16 having the display element 18. Accordingly, the display device 10 functions as, for example, an active matrix type LCD in cooperation with a predetermined number of display elements 18 arranged in a staggered pattern on the substrate 12. For this purpose, the display device 10 is further provided with a display control unit 24 that drives and controls the display elements 18. Further, when the display device 10 is configured as a reflective LCD, a reflector (not shown) is installed adjacent to the substrate 12, and when the display device 10 is configured as a transmissive LCD, a backlight (not shown) is adjacent to the substrate 12. Installed.

  The plurality of display elements 18 are respectively formed in desired cell portions 16 of the substrate 12 through a known film forming process, coating process, and the like. Note that the configuration of the display element 18 is not limited to the above-described LCD element. For example, a self-light emitting element such as an EL (electroluminescence) element or an LED (light emitting diode) element, or a charged particle group such as electronic ink may be employed. You can also. Further, the arrangement of the display elements 18 is not limited to the staggered arrangement described above, and various shapes and dimensions of the individual display elements 18 can be set. In any configuration, a predetermined number of display elements 18 cooperate to display a desired image in the screen area 14 under the control of the display control unit 24.

  Each photodetecting element 20 has a pixel structure of a CCD (Charge Coupled Device). That is, a known pixel component (not shown) such as an electrode, a photodiode, or a microlens is installed in each cell unit 16 having the light detection element 20. Therefore, in the display device 10, a predetermined number of photodetecting elements 20 arranged in a staggered pattern on the substrate 12 individually perform photoelectric conversion and transmit an imaging signal to the input processing unit 22, and the input processing unit 22 By processing the position of the light detection element 20 that has output the image pickup signal as a touch input position, it functions as an optical touch panel.

  More specifically, each light detection element 20 detects the external light L1 incident on the screen area 14 from the outside of the display device 10 and when the operator points the desired position of the screen area 14 with the fingertip 26 ( That is, it is configured to detect a local shadow S of the external light L1 generated when a touch input is made (FIG. 3). Here, in the display device 10, a transparent plate 28 for protecting the screen region 14 is disposed to face the substrate 12 so as to cover the entire screen region 14. Therefore, each detection element 20 detects a local shadow S projected on the screen area 14 via the transparent plate 28 of the fingertip 26 or the pen tip 30 (FIG. 4) touching the desired position of the transparent plate 28. Become. The display light L2 such as a backlight by the display element 18 is observed by the operator through the transparent plate 28.

  The input processing unit 22 performs arithmetic processing on the imaging signals acquired from the individual light detection elements 20, compares the optical data such as the intensity of light detected by each light detection element 20 with a predetermined threshold value, and It is determined whether or not the local shadow S due to the touch input is detected. When the input processing unit 22 determines that any of the light detection elements 20 has detected the local shadow S of the external light L1, the input processing unit 22 performs a touch input on the two-dimensional coordinate position in the screen region 14 of the light detection element 20. Input processing is performed as coordinate position data. Further, the input processing unit 22 transmits an input coordinate signal to a CPU (not shown) of the data processing device on which the display device 10 is mounted, and the CPU sends a necessary control command to various control units such as the display control unit 24. . Note that the light detection element 20 formed of a CCD element only needs to be able to detect the local shadow S of the external light L1, so that the input processing unit 22 does not need to perform image processing based on the imaging signal from the light detection element 20.

  The plurality of light detection elements 20 are respectively formed in desired cell portions 16 of the substrate 12 through a known film forming process, coating process, and the like. The configuration of the photodetecting element 20 is not limited to the CCD element, and various configurations capable of detecting light, such as a CdS (cadmium sulfide) element, a photodiode, and a complementary metal-oxide semiconductor (CMOS) can be employed. . In addition, the arrangement of the light detection elements 20 is not limited to the staggered arrangement described above, and the shape and size of each of the light detection elements 20 can be set variously. Preferably, a plurality of display elements 18 are provided in the screen region 14. Are evenly mixed and arranged. Further, the transparent plate 28 can be made of acrylic, polycarbonate, PET (polyethylene terephthalate), glass or the like.

  According to the display device 10 having the above-described configuration, since both the display function and the touch input function are realized by the single substrate 12, the touch panel is disposed on the screen of the display device in a layered manner. Reduction in size and height can be promoted. In addition, a plurality of light detection elements 20 arranged in a mixed manner with a plurality of display elements 18 in the screen region 14 of the substrate 12 detect the local shadow S of the external light L1 incident on the screen region 14, and the input processing unit 22 is configured to process the position of the local shadow S as the touch input coordinate position, so that there is no risk of malfunction due to the external light L1 even when used under strong external light L1 such as sunlight. To be eliminated. Further, even if the light amount of the display light L2 is reduced due to deterioration of the backlight or the display element 18 (that is, deterioration of the display function), the position detection accuracy is not affected. Further, the installation of a backlight and the use of a self-luminous element are not essential requirements, and the present invention can also be applied to a display device (for example, a reflective LCD, electronic paper, etc.) that displays images using external light. Therefore, the display device 10 is a display device with a touch input function that can be applied regardless of the configuration of the image display mechanism, such as a transmissive LCD, a reflective LCD, an EL element, and an LED, and has excellent reliability and expandability.

  In the display device 10, it is desirable that the scattered light or reflected light of the display light L <b> 2 from the display element 18 can be prevented as much as possible from reducing the detection accuracy of the touch input position due to noise. To that end, it is advantageous to have a plurality of barriers 32 extending between the plurality of cell portions 16 along the surface 12a of the substrate 12, as shown in FIG. Each barrier 32 acts to prevent the display light L <b> 2 from each display element 18 from entering the adjacent photodetector 20. Such a barrier 32 can be additionally formed as a fine rib of a resin material in the film forming / coating process for forming the display element 18 or the light detecting element 20. For the same purpose, an anti-reflection layer (not shown) for preventing the display element 18 from reflecting the display light L2 is provided on the transparent plate 28 disposed opposite to the substrate 12, or external light L1 and display light L2 are provided. It is also possible to provide a polarizing film (not shown) for controlling the above.

  Further, in the display device 10, it is desirable that the change in the display light L2 by the display element 18 is not erroneously detected as the local shadow S of the external light L1. For that purpose, it is advantageous that each photodetecting element 20 detects the intensity and spectrum of light, for example, as an imaging signal of a CCD. In this case, the input processing unit 22 detects the intensity and spectrum of the light detected by the light detection element 20 by comparing the intensity and spectrum of the display light L2 by each display element 18 at that moment separately detected or stored. Whether the light is the local shadow S of the external light L1 or the reflected light or scattered light of the display light L2 by the display element 18 is identified and determined.

  Here, when the detection light is the local shadow S of the external light L1, the intensity and spectrum of the detection light are completely unrelated to the intensity and spectrum of the display light L2, but the detection light is In the case of the reflected or scattered light of the display light L2, at least the spectrum of the detection light shows a form similar to the spectrum of the display light L2. Therefore, the input processing unit 22 converts the detection light from the light detection element 20 to the local light of the external light L1 only when the spectrum of the detection light acquired from the light detection element 20 is not related to the spectrum of the display light L2. The touch input coordinate position is specified by determining the shadow S.

  As shown in FIG. 5, in the display device 10, the light detection element 20 can also be arranged separately from the cell portion 16 of the substrate 12. In the configuration shown in the drawing, a plurality of (predetermined number) of photodetecting elements 20 and a plurality of desired cell units 16 individually associated with the photodetecting elements 20 (that is, the display element 18 is not disposed) The light guide members 34 are individually arranged. The plurality of photodetecting elements 20 are arranged on one surface of the photodetecting member 36 provided apart from the substrate 12 in a two-dimensional array corresponding to the two-dimensional array in the screen region 14 (FIG. 2) of the substrate 12. Adjacent to each other.

  Each light guide member 34 is formed of, for example, an optical fiber, and one end surface in the longitudinal direction thereof is disposed in the corresponding cell portion 16, and the other end surface in the longitudinal direction is disposed opposite to the corresponding light detection element 20. The external light L1 incident on the light is guided to the related light detection element 20. Accordingly, each light detection element 20 detects the external light L1 and its local shadow S, and the input processing unit 22 detects the local shadow S of the external light L1 on the light detection member 36 of the light detection element 20. The position (corresponding to the position in the screen area 14 on the coordinates) is processed as the touch input coordinate position. According to such a configuration, since only the display element 18 needs to be formed in the cell portion 16 of the substrate 12, there is an advantage that the substrate 12 can be easily manufactured.

  As shown in FIG. 6, in the display device 10, both the display element 18 and the light detection element 20 can be arranged separately from the cell portion 16 of the substrate 12. In the illustrated configuration, the first light guide path 38 is formed between all the cell portions 16 in the screen region 14 (FIG. 2) and the corresponding number of display elements 18 (only one is shown), A second light guide 40 is formed between the cell portion 16 and the number of photodetecting elements 20 corresponding to the number (only one shown), and the first light guide 38 and the second light guide 38 are formed on the light guides 38, 40. A switching member 42 that switches between the optical paths 40 as needed is installed. The plurality of display elements 18 correspond to a two-dimensional arrangement of the cell portions 16 in the screen region 14 (FIG. 2) of the substrate 12 on one surface of a display member (not shown) provided separately from the substrate 12. In a two-dimensional array, they are arranged adjacent to each other. Similarly, the plurality of photodetecting elements 20 are arranged on one surface of a photodetecting member (not shown) provided separately from the substrate 12, and the two-dimensional array of cell portions 16 in the screen region 14 (FIG. 2) of the substrate 12. Are arranged adjacent to each other.

  The first light guide path 38 includes a plurality (only one is shown) of first optical fibers 44 having one end face in the longitudinal direction arranged in each cell portion 16 and a plurality of first optical fibers 44 arranged in the opposite direction to the individual display elements 18. The second optical fiber 46 (only one shown) can be configured. The second light guide path 40 has a plurality of (only one shown) first optical fibers 44 whose longitudinal end faces are arranged in the individual cell portions 16 and the longitudinal end faces of the individual light detection elements 20. A plurality of (only one shown) third optical fibers 48 can be arranged. The switching member 42 is a movable minimum disposed between the other end surface in the longitudinal direction of the first optical fiber 44, the other end surface in the longitudinal direction of the second optical fiber 46, and the other end surface in the longitudinal direction of the third optical fiber 48. An optical waveguide member having a mirror or a switch function can be used.

  In the above configuration, while the display device 10 performs image display, the switching member 42 is switched, and the display light L2 from the individual display elements 18 passes through the first light guide path 38 to all the cell portions 16 of the substrate 12. (Fig. 6 (a)). Further, when touch input is performed on the display device 10, the switching member 42 is switched, and the external light L 1 incident on all the cell portions 16 of the substrate 12 is detected individually via the second light guide 40. The light is guided to the element 20 (FIG. 6B). Then, the input processing unit 22 (FIG. 1) detects the position (the position in the screen region 14) on the light detection member (not shown) of the light detection element 20 that has detected the local shadow S (FIG. 3) of the external light L1. And corresponding coordinates) are processed as touch input coordinate positions. According to such a configuration, it is possible to improve the touch position detection accuracy by the light detection element 20 without degrading the resolution of image display by the display element 18. Further, there is an advantage that the manufacture of the substrate 12 becomes easy.

  In the display device 10, it is important that the input processing unit 22 performs the above-described coordinate input process only when the local shadow S of the external light L1 is generated by the touch input operation by the operator. For that purpose, the input processing unit 22 determines whether or not there is a change in the local shadow S within a predetermined time with respect to the light detection element 20 that has detected the local shadow S of the external light L1, and if there is a change over time. Only when it is determined, the position of the photodetecting element 22 that has detected the local shadow S can be processed as the touch input coordinate position. According to such a configuration, for example, when foreign matter or dirt is present on the surface of the transparent plate 28, the local shadow S caused thereby does not substantially change within a predetermined time. Such a shadow detection signal from the element 22 can be prevented from being handled as coordinate input data.

  Further, in the display device 10, each light detection element 20 may be configured to detect reflected light of the display light L <b> 2 by each display element 18 in addition to the external light L <b> 1 and the local shadow S thereof. In this case, the input processing unit 22 detects the position of the light detection element 22 that has detected the local shadow S of the external light L1 in the screen region 14 (FIG. 1) of the substrate 12 and the reflected light of the display light L2. Either one of the position of the detection element 22 in the screen area 14 can be selected and processed as a touch input coordinate position. According to such a configuration, when the display device 10 is used in a situation where the external light L1 is weak and it is difficult to detect the local shadow S, the method can be switched to a method for detecting the reflected light of the display light L2. it can.

It is a figure which shows typically the display apparatus with a touch input function by one Embodiment of this invention using a functional block. It is a schematic plan view of the board | substrate integrated in the display apparatus with a touch input function of FIG. It is a figure which shows typically the touch position detection function in the display apparatus with a touch input function of FIG. It is a figure which shows typically the touch position detection function in the touch input type keyboard apparatus by a modification. It is a figure which shows typically the display apparatus with a touch input function by other embodiment of this invention using a functional block. FIG. 6 is a diagram schematically showing a display device with a touch input function according to still another embodiment of the present invention, and shows (a) an image display state and (b) a touch input detection state, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 12 Board | substrate 14 Screen area | region 16 Cell part 18 Display element 20 Photodetection element 22 Input processing part 24 Display control part 28 Transparent board 32 Barrier 34 Light guide member 38 1st light guide path 40 2nd light guide path 42 Switching member

Claims (7)

A substrate, a plurality of cell portions provided on the substrate and defining a screen area, a plurality of display elements and a plurality of light detection elements provided in relation to the cell portions, and light detected by the light detection elements; In a display device with a touch input function comprising a processing unit that identifies a touch input coordinate position in the screen area based on
Each of the light detection element is Rutotomoni can detect outside light incident from the outside of the apparatus to the screen area, to detect the intensity and spectrum of light,
The processing unit processes the position in the screen area of the light detection element that has detected a local shadow of the external light as the touch input coordinate position, and the intensity of the light detected by the light detection element and Identifying the external light and display light by each of the display elements based on a spectrum ;
A display device with a touch input function.   The apparatus further comprises a barrier extending between the plurality of cell portions along the surface of the substrate and preventing display light from each of the display elements from entering each of the light detection elements. A display device with a touch input function described in 1.   The touch input according to claim 1, further comprising: a transparent plate disposed opposite to the substrate; and an antireflection layer provided on the transparent plate and preventing reflection of display light by the plurality of display elements. Display device with function. A plurality of light-detecting elements arranged between the light-detecting elements and the desired cell portions individually associated with the light-detecting elements, and a plurality of the external light incident on the desired cell portions are guided to the related light-detecting elements. The display device with a touch input function according to claim 1, further comprising a light guide member . A first light guide formed between the plurality of cell units and the plurality of display elements; a second light guide formed between the plurality of cell units and the plurality of light detection elements; further comprising a switching member for switching from one another as required in the first light path and the second light path, a touch input function-equipped display device according to any one of claims 1-3. The processing unit determines whether or not there is a change in the local shadow within a predetermined time with respect to the light detection element that has detected the local shadow of the external light, and when there is the change, the local shadow processing the detected position of the optical detecting element as the touch input coordinate position of a touch input function-equipped display device according to any one of claims 1-5. Each of the light detection elements can detect reflected light of display light by each of the display elements, and the processing unit detects the position of the light detection element where the local shadow of the external light is detected, and the display 2. The display with a touch input function according to claim 1 , wherein either one of a position in the screen region of the light detection element that detects the reflected light of light is selected and processed as the touch input coordinate position. apparatus.

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