WO2018154992A1

WO2018154992A1 - Display device

Info

Publication number: WO2018154992A1
Application number: PCT/JP2018/000530
Authority: WO
Inventors: 教和方志; 義幸月崎; 直之麻野; 杉山　健
Original assignee: 株式会社ジャパンディスプレイ
Priority date: 2017-02-27
Filing date: 2018-01-11
Publication date: 2018-08-30

Abstract

A display device provided with: an invisible light source, provided on the mounting surface of a substrate, for radiating an invisible light in a direction that intersects the mounting surface; an illuminant for absorbing the invisible light and emitting a visible light; and a support part for supporting the illuminant so as to be switchable between a first position where the illuminant faces the mounting surface and a second position where the illuminant is at a different position than the invisible light source in the intersecting direction.

Description

Display device

The present invention relates to a display device.

A display device that displays an image using ultraviolet light as a light source is known (for example, Patent Document 1).

JP 2008-145548 A

However, the display device described in Patent Document 1 only uses ultraviolet light to excite phosphors to emit light, and does not use ultraviolet light for other purposes.

The present invention has been made in view of the above problems, and an object thereof is to provide a more versatile display device.

A display device according to an embodiment of the present invention includes an invisible light source that is provided on a mounting surface of a substrate and irradiates invisible light in a direction intersecting the mounting surface, and a light emitting body that absorbs the invisible light and emits visible light. And a support portion that supports the light emitter in a switchable manner between a first position where the light emitter faces the mounting surface and a second position in which the light emitter is different from the invisible light source in the intersecting direction. With.

FIG. 1 is a schematic diagram showing a main configuration of a display device according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating a circuit configuration example of the light source substrate and the control circuit according to the first embodiment. FIG. 3 is a schematic view illustrating a case where a light emitter is interposed between a light source and a user. FIG. 4 is a schematic view illustrating a case where no light emitter is interposed between the light source and the user. FIG. 5 is a schematic diagram illustrating a circuit configuration example of the light source substrate, the control circuit, and the detection unit according to the second embodiment. FIG. 6 is a schematic diagram illustrating a circuit configuration example of the light source substrate and the control circuit according to the third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating a main configuration of a display device 1 according to a first embodiment of the present invention. The display device 1 includes a light source substrate 10, a support unit 60, and a control unit 11 (see FIG. 2). The light source substrate 10 is provided with an invisible light source (for example, a light source 40) that emits invisible light IVL (see FIGS. 3 and 4) having a predetermined wavelength. That is, the light source 40 is provided on the mounting surface 15 of the substrate (the light source substrate 10), and emits invisible light in a wavelength band including a predetermined wavelength in a direction intersecting the mounting surface 15, preferably in a vertical direction. In FIG. 1, the upper side of the light source substrate 10 is illustrated as the mounting surface 15 side. The invisible light IVL is invisible light for human beings, and is light having a wavelength excluding, for example, purple-red visible light (wavelength: 380 [nm] -750 [nm]).

FIG. 2 is a schematic diagram illustrating a circuit configuration example of the light source substrate 10 and the control unit 11 according to the first embodiment. The light source substrate 10 has a plurality of light sources 40 arranged in a two-dimensional array (for example, in a matrix). As described above, the plurality of invisible light sources (light sources 40) are arranged in a two-dimensional array on the substrate (light source substrate 10). Hereinafter, the arrangement direction of the two-dimensional arrangement of the plurality of light sources 40 will be described as the X direction and the Y direction orthogonal to the X direction. That is, the mounting surface 15 is along the XY plane. Further, the vertical direction of the mounting surface 15 is the Z direction. Note that the

light sources

40a, 40b, 40c, and 40d may be referred to as the light sources 40 when they are not particularly distinguished. In FIG. 2, four

light sources

40a, 40b, 40c, and 40d are arranged so that X direction × Y direction = 2 × 2, but the number and arrangement of the light sources 40 are not limited thereto. These can be changed as appropriate.

The light source substrate 10 has a source driver 100 and a gate driver 200. The control unit 11 controls the operations of the source driver 100 and the gate driver 200 based on, for example, a video signal supplied from an external host integrated circuit (IC) 90. For example, the control unit 11, which is an IC, supplies control signals to the source driver 100 and the gate driver 200, and controls them to operate in synchronization with each other.

The source driver 100 is an IC that outputs a voltage applied to each light source 40. The gate driver 200 is an IC that outputs a gate voltage to be applied to a thin film transistor (TFT) element provided in each light source 40. In FIG. 2, the source driver 100 and the gate driver 200 are described as separate components mounted on the light source substrate 10, but both of them may be incorporated in one IC or formed directly on the substrate. It may be configured by a configured circuit.

Signal lines (for example, the first signal line 110 and the second signal line 120) are connected to the source driver 100. The signal line is shared by the light sources 40 arranged along the extending direction (for example, the Y direction) of the first signal line 110.

The gate driver 200 is connected with scanning lines (for example, the first scanning line 210 and the second scanning line 250), the light emission control line 220, and the reset line 230. The scanning lines are connected to a plurality of light sources 40 arranged along the extending direction of the first scanning lines 210 (for example, the X direction). The light emission control line 220 and the reset line 230 are connected to a plurality of light sources 40 sandwiched between the first scanning line 210 and the second scanning line 250. The extending direction of the light emission control line 220 and the reset line 230 is the same as the extending direction (for example, the X direction) of the first scanning line 210 and the second scanning line 250. The light emission control line 220 and the reset line 230 are connected to the reset switch 31.

The light source substrate 10 has a high potential line 300. A predetermined voltage (for example, 10 [V]) is applied to the high potential line 300 so that the potential difference from the low potential line GND becomes the potential PVDD. A power supply line 310 is connected to the high potential line 300. A plurality of light sources 40 arranged along the extending direction of the power line 310 (for example, the Y direction) are connected to the power line 310. Electric power for light emission from a light source element 371 of each light source 40 (for example, an organic light emitting diode (OLED)) is sent from a power source (not shown) via a power line 310.

In addition, although the light source element using OLED is demonstrated as the following light source element 371, this Embodiment is not limited to this. The light source element 371 may include another light source driven by direct current, such as a light emitting diode that does not use an organic compound. The light emitter of the light source element 371 may be a thin film obtained by vapor deposition or crystal growth, or may not be a thin film. As a light source element that is not a thin film, for example, a light source element using a bulk semiconductor may be used.

The control unit 11 includes a gradation detection unit 111 and a timing control unit 112. The gradation detector 111 detects a gradation signal Vdisp for each light source 40. The timing control unit 112, based on the gradation signal Vdisp and the gradation for each light source 40 of the gradation signal Vdisp detected by the gradation detection unit 111, the initialization light emission control signal xasw1, the light emission control signal (for example, The control signals including the first light emission control signal xasw2-1, the second light emission control signal xasw2-2), the light emission control signal BG, and the reset control signal RG are generated.

The source driver 100 outputs voltages (for example, the first voltage Vsig1 and the second voltage Vsig2) corresponding to the emission intensity of each light source 40 based on the gradation signal Vdisp input from the control unit 11. The source driver 100 also includes transistors (for example, a first initialization signal control switch 101, a second initialization signal control switch 102, a first voltage control switch 103, and a second voltage control) for controlling the operation of each light source 40. Switch 104).

Hereinafter, the configuration relating to the light source 40a among the four

light sources

40a, 40b, 40c, and 40d illustrated in FIG. 2 will be described as an example.

In the first initialization signal control switch 101, one of the source and drain (first terminal) is connected to the first signal line 110, and the other (second terminal) is supplied with the initialization voltage Vini. The initialization light emission control signal xasw1 is input to the gate (third terminal) of the first initialization signal control switch 101. When the initialization light emission control signal xasw1 is applied to the gate of the first initialization signal control switch 101, the first initialization signal control switch 101 becomes conductive, and the initialization voltage Vini is applied to the first signal line 110. . The initialization voltage Vini is, for example, 1.27V.

In the first voltage control switch 103, one of a source and a drain (first terminal) is connected to the first signal line 110, and the other (second terminal) is supplied with the first voltage Vsig1. The first light emission control signal xasw2-1 is input to the gate (third terminal) of the first voltage control switch 103. When the first light emission control signal xasw2-1 is applied to the gate of the first voltage control switch 103, the first voltage control switch 103 is turned on, and the first voltage Vsig1 is applied to the first signal line 110.

The gate driver 200 includes a reset control switch 235. The reset control switch 235 is a transistor, for example. In the reset control switch 235, one of the source and the drain (first terminal) is connected to the reset line 230, and the reset voltage Vrst is supplied to the other (second terminal). The reset control signal RG is input to the gate (third terminal) of the reset control switch 235. When the reset control signal RG is applied to the gate of the reset control switch 235, the reset control switch 235 becomes conductive, and the reset voltage Vrst is applied to the reset line 230. The reset voltage Vrst is, for example, −3V.

The light source 40a includes a switch 331, a driving transistor 341, a light source element 371, a storage capacitor 351, and an additional capacitor 361.

The switch 331 has one of a source and a drain (first terminal) connected to the first signal line 110. The gate (third terminal) of the switch 331 is connected to the first scanning line 210. The switch 331 is a TFT element, for example.

One of the source and drain (first terminal) of the driving transistor 341 is connected to the anode of the light source element 371 and the other (second terminal) is connected to the reset line 230. The gate (third terminal) of the driving transistor 341 is connected to the other of the source and drain of the switch 331 (second terminal).

A storage capacitor 351 is connected between one of the source and drain (first terminal) and the gate (third terminal) of the driving transistor 341. An additional capacitor 361 is connected to one of the source and drain (first terminal) of the driving transistor 341 between the low potential supply line (for example, the low potential line GND) or the high potential line 300. Is done. Note that the additional capacitor 361 includes the source or drain of the driving transistor 341 (first terminal) and a low potential supply line (for example, the low potential line GND) and the source or drain of the driving transistor 341. (First terminal) and the high potential line 300 may be provided.

The gate driver 200 outputs scanning signals (for example, the first scanning signal SG1 and the second scanning signal SG2). When the first scanning signal SG1 is applied from the gate driver 200 to the first scanning line 210, the switch 331 becomes conductive. When the first voltage Vsig1 is applied from the source driver 100 to the first signal line 110 when the switch 331 is conductive, the first voltage Vsig1 is applied to the gate (third terminal) of the drive transistor 341.

The driving transistor 341 controls the current value supplied to the light source element 371 according to the gate voltage. In parallel with the application of a voltage to the gate (third terminal) of the driving transistor 341, charges are accumulated in the storage capacitor 351. A voltage is applied to the gate (third terminal) of the driving transistor 341 for a certain period even after the switch 331 becomes non-conductive due to the electric charge stored in the storage capacitor 351, and the conductive state of the driving transistor 341 is maintained. Be drunk.

The additional capacitor 361 connected to one of the source and the drain (first terminal) of the driving transistor 341 has a capacity division with the storage capacitor 351 so that the gate of the driving transistor 341 according to the voltage of the first voltage Vsig1 (third Terminal) and one of a source and a drain (first terminal). For example, by making the capacitance of the additional capacitor 361 larger than the capacitance of the storage capacitor 351, between the gate (third terminal) of the driving transistor 341 and one of the source and drain (first terminal). The voltage setting range can be widened.

The cathode of the light source element 371 is connected to a low potential supply line (for example, a low potential line GND). When the drive transistor 341 is in a conductive state and the reset switch 31 is in a conductive state, a current flows through the light source element 371 in accordance with the gate voltage of the drive transistor 341, and the light source element 371 emits light.

The configuration related to the light source 40a has been described above as an example, but the other

light sources

40b, 40c, and 40d illustrated in FIG. However, different gradation signals Vdisp are supplied to the plurality of light sources 40 arranged in the X direction. As a specific example, the first voltage Vsig1 is supplied to the light source 40a, and the second voltage Vsig2 is supplied to the light source 40b. The plurality of light sources 40 arranged in the Y direction are driven at different timings. As a specific example, the

light sources

40a and 40b are driven according to the output timing of the first scanning signal SG1, and the

light sources

40c and 40d receive the second scanning signal SG2 output at a timing different from the first scanning signal SG1. It is driven according to the output timing. Note that the plurality of light sources 40 arranged in the Y direction share a signal line, but voltages supplied in accordance with the respective drive timings are individually controlled.

The light source 40b includes a switch 332, a drive transistor 342, a light source element 372, a storage capacitor 352, and an additional capacitor 362. The light source 40 c includes a switch 333, a driving transistor 343, a light source element 373, a storage capacitor 353, and an additional capacitor 363. The light source 40d includes a switch 334, a drive transistor 344, a light source element 374, a storage capacitor 354, and an additional capacitor 364. These specific configurations are the same as those of the switch 331, the drive transistor 341, the light source element 371, the storage capacitor 351, and the additional capacitor 361 of the light source 40a. However, the switch 332 has one of the source and the drain (first terminal) connected to the second signal line 120. The switch 333 has a gate (third terminal) connected to the second scanning line 250. The switch 334 has one of a source and a drain (first terminal) connected to the second signal line 120 and a gate (third terminal) connected to the second scanning line 250.

Also, as a configuration related to the second signal line 120, there are a second initialization signal control switch 102 and a second voltage control switch 104. The relationship between the second signal line 120 and the second initialization signal control switch 102 and the second voltage control switch 104 is the relationship between the first signal line 110 and the first initialization signal control switch 101 and the first voltage control switch 103. It is the same. However, the voltage output to the second signal line 120 is the second voltage Vsig2. The light emission control signal applied to the second voltage control switch 104 is the second light emission control signal xasw2-2. By driving each light source 40 individually, an image for one frame is output.

The reset switch 31 is a transistor that controls the electrical connection between the other of the sources or drains (second terminals) of the

drive transistors

341, 342, 343, and 344 and the power supply line 310. The gate (third terminal) of the reset switch 31 is connected to the light emission control line 220. When the light emission control signal BG is applied from the gate driver 200 to the light emission control line 220, the reset switch 31 becomes conductive.

If the reset switch 31 is non-conductive and the reset control switch 235 is conductive, the other (second terminal) of the source or drain of the

drive transistors

341, 342, 343, 344 is connected to the reset line 230. The reset voltage Vrst may be a potential of a low potential supply line (for example, the low potential line GND).

The equivalent circuit diagram shown in FIG. 2 is an example, and a different circuit may be adopted. For example, the reset switch 31 may be provided for each light source 40. The correspondence relationship between the source and drain and the first terminal and the second terminal described above is merely an example, and can be appropriately switched according to the specific circuit configuration of the source driver 100, the gate driver 200, and the light source 40. It is.

The specific position where the circuit which comprises the display apparatus 1, such as the control part 11, is provided is arbitrary. For example, it may be mounted on a flexible substrate including wiring that transmits the gradation signal Vdisp, or may be mounted on the light source substrate 10.

The

light source elements

371, 372, 373, and 374 in Embodiment 1 irradiate ultraviolet light. Specifically, the

light source elements

371, 372, 373, and 374 irradiate, for example, near ultraviolet light (wavelength: 200 [nm] to 380 [nm]) during light emission. More specifically, the ultraviolet light emitted from the

light source elements

371, 372, 373, and 374 has a wavelength (for example, UV-A (wavelength: 315 [nm] -380 [nm]) that has less influence on a living body such as a human. )) UV light is desirable.

The support 60 is provided with a light emitter 50 (for example, the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B) that emits light by absorbing the invisible light IVL. Specifically, the support unit 60 includes a light emitter support unit 61 and a rotation support unit 62. The light emitter support 61 is a lattice-shaped member having slits along the Y direction, for example. A first light emitter 50R, a second light emitter 50G, and a third light emitter 50B are provided in the slit. The first light emitter 50R, the second light emitter 50G, and the third light emitter 50B are periodically arranged along the X direction. The first light emitter 50R, the second light emitter 50G, and the third light emitter 50B may be collectively referred to as the light emitter 50 in some cases. As illustrated in FIG. 1, in the first position, the plurality of light emitters 50 are arranged along an array in at least one direction (X direction) of the two-dimensional array, and the mounting surface 15 of the substrate (light source substrate 10). The position of the plurality of light emitters 50 arranged in one direction in the vertical direction corresponds to the position of the invisible light source (light source 40) arranged in one direction (X direction). In addition, the specific structure of the support part 60 which supports the light-emitting body 50 is not restricted to this. For example, instead of the light emitter support 61, a plate-like substrate having translucency may be adopted. In this case, the light emitter 50 is disposed on one surface side of the light-transmitting plate-like substrate.

The first light emitter 50R, the second light emitter 50G, and the third light emitter 50B are phosphors that contain pigments that emit visible light of different colors by photoluminescence in response to irradiation with invisible light IVL. In the first embodiment, the first light emitter 50R absorbs ultraviolet light and emits red visible light VLR when irradiated with ultraviolet light. Further, the second light emitter 50G absorbs ultraviolet light and emits green visible light VLG when irradiated with ultraviolet light. Further, the third light emitter 50B absorbs ultraviolet light and emits blue visible light VLB when irradiated with ultraviolet light. Examples of the pigment of the first light emitter 50R include Y ₂ O ₃ : Eu ³⁺ . Examples of the pigment of the second light emitter 50G include LaPO ₄ : Ce ³⁺ and Tb ³⁺ . Examples of the pigment of the third light emitter 50B include (Sr, Ba, Ca) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ . The specific composition of the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B is not limited to this, and the wavelength of the invisible light IVL from the invisible light source (light source 40) that functions as excitation light; Any phosphor can be appropriately used as the light emitter 50 as long as the phosphor is suitable for the difference between the wavelengths of visible light VLR, VLG, and VLB emitted from the light emitter 50 by absorbing the invisible light IVL. The fluorescent material has a difference (Stokes shift) between the maximum excitation wavelength of the invisible light IVL emitted from the invisible light source (light source 40) and the wavelength of the visible light VLR, VLG, VLB emitted from the light emitter 50 that has the maximum efficiency. It is desirable to select based on this. Further, the color and the number of colors of visible light emitted from the light emitter 50 can be changed as appropriate.

The rotation support part 62 is a member that rotatably supports the light emitter support part 61, for example, as shown in FIG. Specifically, the rotation support part 62 is a light emitter support part via a rotation shaft 63 provided on the light emitter support part 61 side of the light source substrate 10 and the light emitter support part 61 provided to face each other. 61 is connected. In addition, the back side of the rotation support part 62 is fixed to the light source substrate 10. Thereby, the light emitter support portion 61 can change the rotation angle of the light emitter 50 with respect to the light source substrate 10 by rotating about the rotation shaft 63. As described above, the support unit 60 includes the first position PA (see FIG. 3) where the light emitter 50 faces the mounting surface 15 of the substrate (light source substrate 10) and the light emitter 50 in an invisible light source in the direction perpendicular to the mounting surface 15. The light emitter 50 is supported so as to be switchable to a second position PB (see FIG. 4) at a position different from the (light source 40).

FIG. 3 is a schematic view illustrating the case where the light emitter 50 is interposed between the light source 40 and the user. 3 and 4, a user who visually recognizes an image is schematically illustrated as an eye E. When the light emitter 50 is located at the first position PA, the light emitter 50 is interposed between the light source 40 and the user. In this case, the invisible light IVL from the light source 40 is absorbed, and the light emitter 50 emits visible light VLR, VLG, and VLB. The user can visually recognize an image output by visible light VLR, VLG, and VLB.

FIG. 4 is a schematic view illustrating the case where the light emitter 50 is not interposed between the light source 40 and the user. When the light emitter 50 is located at the second position PB, the light emitter 50 is not interposed between the light source 40 and the user. In this case, the user visually recognizes the image output by the invisible light IVL, but cannot directly view the invisible light IVL. For example, as illustrated in FIG. The image output by the invisible light IVL is converted into visible light and viewed. The conversion device 70 has a phosphor provided separately from the light emitter 50 and absorbs the invisible light IVL from the light source 40 to emit visible light VL, thereby visually recognizing an image output by the invisible light IVL. enable. Specifically, the conversion device 70 includes, for example, an image sensor having sensitivity to invisible light IVL (for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor) and a display panel that displays and outputs an image captured by the image sensor. Have. When the conversion device 70 is used, the light receiving surface of the image sensor is directed to the display device 1. The image output by the invisible light IVL is captured by the image sensor. The image sensor outputs a captured image to the display panel. The display panel displays and outputs the captured image with visible light. More specifically, in the conversion device 70, for example, a display panel is provided on the opposite side of the light receiving surface of the image sensor. Accordingly, the user can visually recognize the image output by the invisible light IVL by visually recognizing the display device 1 with the conversion device 70 interposed therebetween so as to pass through the viewfinder. The conversion device 70 may have a light emitter that absorbs the invisible light IVL and emits visible light VL on the same principle as the light emitter 50.

In addition, the structural unit of the pixel in the display device 1 is arbitrary. For example, a predetermined region including one each of the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B arranged in the X direction may be used as a pixel. One or more light sources 40 arranged in the Y direction are included in the predetermined area. A plurality of pixels may share the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B that are continuous in the Y direction. In this case, the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B are continuous, but the intensity of the invisible light IVL emitted from the plurality of light sources 40 arranged in the Y direction by the control unit 11 is individually set. Since it is controllable, a part of the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B corresponding to each position of the plurality of light sources 40 arranged in the Y direction can be handled as individual pixels. . A plurality of first light emitters 50R, second light emitters 50G, and third light emitters 50B may be provided in accordance with the arrangement of one or more light sources 40 arranged in the Y direction. That is, the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B may be arranged in a matrix.

Further, the distance between the light source substrate 10 and the light emitter support portion 61 illustrated in FIGS. 1, 3, and 4 is merely schematic, and the light source substrate 10 and the light emitter support portion 61 in the actual display device 1. It does not indicate the interval. The light emitter support 61 may be closer to the light source substrate 10 or may be further separated as necessary.

The display device 1 can perform RGB color display at the first position PA. On the other hand, at the second position PB, although it is monochrome display, it is possible to display at a resolution three times that of the first position PA.

According to the first embodiment, as a display output form of an image using the invisible light IVL, a form in the case where the light emitter 50 is the first position PA and a form in the case where it is the second position PB can be provided. As a result, when the light emitter 50 is at the first position PA, an image that can be visually recognized by anyone can be displayed and output, and when the light emitter 50 is at the second position PB, the conversion device 70 is owned. It is possible to display and output an image that is visible only to the user who is viewing. Thus, according to the first embodiment, a more versatile display device 1 can be provided.

As described above, the case where the invisible light IVL irradiated by the

light source elements

371, 372, 373, and 374 of the light source 40 is ultraviolet light is exemplified, but the invisible light IVL is not limited to ultraviolet light. For example, the invisible light IVL may be infrared light. In this case, the

light source elements

371, 372, 373, and 374 are replaced with light source elements that emit infrared light (for example, IRLED: InfraRed Light Emitting Diode). Further, the light emitter 50 is replaced with one that absorbs infrared light and emits visible light VLR, VLG, and VLB. Further, the conversion device 70 enables an image output by infrared light to be visually recognized, such as a night vision device. In other words, the invisible light IVL in this case is infrared light that is visible with the conversion device 70 functioning as a night vision device. For example, a photomultiplier tube is employed in the conversion device 70 that functions as a night vision device, instead of the above-described imaging element. The photomultiplier tube is, for example, a micro channel plate (MCP) type photomultiplier tube or a dynode type photomultiplier tube. The conversion device 70 functioning as a night vision device may be a thermography. The wavelength of the infrared light is arbitrary, and is appropriately set within a wavelength range longer than 750 [nm], for example.

By making the invisible light IVL infrared light that can be visually recognized by the night vision device, it becomes easier to visually recognize the image of the invisible light IVL even at a greater distance.

(Embodiment 2)
Next, a display device according to Embodiment 2 of the present invention will be described. In the description of the display device, the same components as those of the display device 1 of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

FIG. 5 is a schematic diagram illustrating a circuit configuration example of the light source substrate 10, the control unit 11A, and the detection unit 80 according to the second embodiment. As illustrated in FIG. 5, the display device according to the second embodiment includes a detection unit 80 in addition to the configuration of the display device 1 according to the first embodiment.

The detecting unit 80 detects whether the position of the light emitter 50 is the first position PA or the second position PB. Specifically, the detection unit 80 is an optical switch having a light emitting unit 81 and a light receiving unit 82, for example. The ray of light from the light emitting part 81 to the light receiving part 82 is shielded by the rotation angle of the light emitter support part 61 where the position of the light emitter 50 is either the first position PA or the second position PB. It is provided so as to be opened at the rotation angle of the light emitter support portion 61. Accordingly, the detection unit 80 can detect whether the position of the light emitter 50 is the first position PA or the second position PB based on whether or not the light detection unit 82 detects light. The light receiving unit 82 performs output Ssig indicating whether or not light is detected. The output of the light receiving unit 82 is input to the switching unit 113 of the control unit 11A.

The control unit 11A of the second embodiment has a function of switching display output contents according to the position of the light emitter 50 in addition to the function of the control unit 11 of the first embodiment. Specifically, the control unit 11A includes a switching unit 113. The switching unit 113 determines from the output of the light receiving unit 82 whether the position of the light emitter 50 is the first position PA or the second position PB. The control unit 11 </ b> A controls the plurality of light sources 40 provided on the light source substrate 10 according to the position of the light emitter 50.

In the second embodiment, the first gradation signal Vdisp1 of the image (visible light image) output and visually recognized by the light emission of the light emitter 50 and the first image (invisible light image) that can be visually recognized by using the conversion device 70 are used. The two gradation signal Vdisp2 is input from the host integrated circuit 90A as an individual display image. When the position of the light emitter 50 indicated by the output of the light receiving unit 82 is the first position PA, the switching unit 113 treats the first gradation signal Vdisp1 as the gradation signal Vdisp, and a plurality of light sources provided on the light source substrate 10 The intensity of light emitted from 40 is made to correspond to the display output content of the visible light image. In addition, when the position of the light emitter 50 indicated by the output of the light receiving unit 82 is the second position PB, the switching unit 113 treats the second gradation signal Vdisp2 as the gradation signal Vdisp, and sets the plurality of light sources provided on the light source substrate 10. The intensity of light emitted from the light source 40 is made to correspond to the display output content of the invisible light image.

In the second embodiment, the relationship between the pixel and the light source 40 may change depending on whether the position of the light emitter 50 is the first position PA or the second position PB. For example, in the second embodiment, when the light emitter 50 is located at the first position PA, the predetermined region including the first light emitter 50R, the second light emitter 50G, and the third light emitter 50B arranged in the X direction is one. When the light emitter 50 is located at the second position PB, another region including one or more light sources 40 that is not limited to the light source 40 included in the predetermined region is set, and the other region is set as one pixel. It may be a pixel.

According to the second embodiment, the display output content can be changed depending on whether the position of the light emitter 50 is the first position PA or the second position PB.

(Embodiment 3)
Next, a display device according to Embodiment 3 of the present invention will be described. In the description of the display device, the same components as those of the display device 1 of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

FIG. 6 is a schematic diagram illustrating a circuit configuration example of the light source substrate 10B and the control unit 11 according to the third embodiment. The light source substrate 10B of the display device of Embodiment 3 is provided with a mixture of light sources 40 that emit invisible light IVL having different wavelengths. As a specific example, the

light source elements

373B and 374B of the

light sources

40C and 40D shown in FIG. 6 emit invisible light IVL having a wavelength different from that of the

light source elements

371 and 372 of the

light sources

40a and 40b. More specifically, for example, the

light source elements

371 and 372 emit ultraviolet light, and the

light source elements

373B and 374B emit infrared light. As described above, in the third embodiment, the light sources 40 that irradiate the invisible light IVL having different wavelengths are alternately arranged along at least one direction (for example, the Y direction). When describing collectively with the light source 40 in Embodiment 3, the

light sources

40C and 40D are included.

In the third embodiment, invisible light IVL emitted by some of the plurality of light sources 40 causes the light emitter 50 to emit light, but invisible light IVL with different wavelengths emitted by other light sources 40 other than the some of the light sources 40 is emitted. Does not cause the light emitter 50 to emit light. For example, ultraviolet light emitted from the

light source elements

371 and 372 excites the light emitter 50 to emit light, but infrared light emitted from the

light source elements

373B and 374B does not excite the light emitter 50 and does not emit light.

The gradation signal Vdisp of the third embodiment includes a light emission pattern of a light source 40 (for example,

light sources

40a and 40b) for a visible light image and a light emission pattern of a light source 40 (for example,

light sources

40C and 40D) for an invisible light image. Including both. That is, in the third embodiment, the visible light image and the invisible light image are not displayed selectively, but the image for one frame includes both the visible light image and the invisible light image.

In the third embodiment, when the position of the light emitter 50 is the first position PA, the visible light image is provided to a user who does not have the conversion device 70 in a visible state and the invisible light IVL that forms the invisible light image. An invisible light image is provided to a user who has a conversion device 70 (for example, a night vision device) corresponding to the wavelength of. Further, in the third embodiment, when the position of the light emitter 50 is the second position PB, an invisible light image is provided to a user having the conversion device 70 (for example, a night vision device).

In the description with reference to FIG. 6, the light sources 40 that irradiate the invisible light IVL having different wavelengths are arranged alternately along the Y direction, but this is only an arrangement of the light sources 40 that irradiate the invisible light IVL having different wavelengths. It is an example of a pattern and is not limited to this. For example, the light sources 40 that irradiate the invisible light IVL with different wavelengths may be arranged alternately along the X direction, or may be arranged in a staggered manner. Moreover, the ultraviolet light and infrared light which were illustrated above are the examples of the combination of the invisible light IVL of a different wavelength to the last, and it is not restricted to this, You may change suitably one or both of this combination.

According to the third embodiment, a visible light image is provided in a visible state to a user who does not have the conversion device 70, and the conversion device 70 (for example, darkness) corresponding to the wavelength of the invisible light IVL constituting the invisible light image is provided. An invisible light image can be provided to a user having a viewing device.

In addition, the specific structure regarding the position change of the light-emitting body 50 by the support part 60 can be changed suitably. Specifically, the operation of the light emitter support portion 61 is not limited to the rotation described with reference to FIG. 1 but may be a linear motion such as a slide.

Further, the invisible light source that is configured to irradiate the invisible light IVL according to the power supply like the light source 40 is not limited to the configuration including the OLED as described above, for example, a light emitting diode that does not use an organic compound, etc. The structure provided with another light source may be sufficient. Alternatively, the light source 40 may include a light source element that is AC driven.

In addition, other functions and effects brought about by the aspects described in the present embodiment, which are apparent from the description of the present specification, or can be appropriately conceived by those skilled in the art, are naturally understood to be brought about by the present invention. .

Further, the present invention can be described as follows.

1. An invisible light source that is provided on the mounting surface of the substrate and irradiates invisible light in a direction intersecting the mounting surface, a light emitter that absorbs the invisible light and emits visible light, and the light emitter on the mounting surface A display device comprising: a first position that opposes; and a support portion that supports the light emitter so that the light emitter can be switched to a second position that is different from the invisible light source in the intersecting direction.

2. The invisible light is ultraviolet light. Display device.

3. The invisible light is infrared light. Display device.

4. The invisible light source has a light emitting diode. To 3. Display device.

5. The phosphor is a phosphor. To 4. Display device.

6. When the plurality of invisible light sources are arranged in a two-dimensional array on the substrate and are at the first position, the plurality of light emitters are arranged along an array in at least one direction of the two-dimensional array and intersect. In the direction, the position of the light emitter corresponds to the position of the invisible light source. To 5. Display device.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Light source board | substrate 11 Control part 40 Light source 50 Light emitter 50R 1st light emitter 50G 2nd light emitter 50B 3rd light emitter 60 Support part 61 Light emitter support part 62 Rotation support part 63 Rotation shaft 371,372 373, 374, 373B, 374B Light source element IVL Invisible light PA First position PB Second position VL, VLR, VLG, VLB Visible light

Claims

An invisible light source that is provided on the mounting surface of the substrate and that emits invisible light in a direction intersecting the mounting surface;
A light emitter that absorbs the invisible light and emits visible light;
A support portion that supports the light emitter so as to be switchable between a first position where the light emitter faces the mounting surface and a second position where the light emitter is different from the invisible light source in the intersecting direction. A display device provided.
The display device according to claim 1, wherein the invisible light is ultraviolet light.
The display device according to claim 1, wherein the invisible light is infrared light.
The display device according to claim 1, wherein the invisible light source includes a light emitting diode.
The display device according to claim 1, wherein the light emitter is a phosphor.
A plurality of the invisible light sources are arranged in a two-dimensional array on the substrate;
In the case of the first position, the plurality of light emitters are arranged along at least one direction of the two-dimensional array, and the position of the light emitter and the position of the invisible light source correspond to each other in the intersecting direction. The display device according to any one of claims 1 to 5.