JP2015166832A - video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a frame in a joint portion between two displays.SOLUTION: A video display device 10 includes: a first liquid crystal display panel 24 having a first frame 24A; a second liquid crystal display panel 24 arranged adjacent to the first liquid crystal display panel 24 in a first direction and including a second frame 24A; and first and second prism sheets 25 arranged at an interval of a predetermined distance with the first and second liquid crystal display panels 24. The first prism sheet 25 includes a plurality of first triangular prisms having an inclined plane inclined in a direction away from the joint portion between the first liquid crystal display panel 24 and the second liquid crystal display panel 24. The second prism sheet 25 includes a plurality of second triangular prisms having the inclined plane inclined in a direction away from the joint portion. When the first and second liquid crystal display panels 24 are seen from the front surfaces via the first and second prism sheets 25, the first and second frames 24A in the joint portion are not seen.

Description

  The present invention relates to a video display device, and more particularly to a video display device including a liquid crystal display device.

  The liquid crystal display device is used in various video display devices, for example, a pachinko machine or a slot machine as a gaming machine. In recent years, in pachinko machines and slot machines, a main display such as a large liquid crystal display device and a movable accessory (for example, a gimmick that is equipped with an LED etc. on a plastic material and moves brilliantly) are arranged. There is. In addition, a small liquid crystal display device for performing sub-displays is arranged, and sub-displays that sometimes move comically while being synchronized with the content and sound of the main display are used as a technique for exciting the effects.

  For example, in a display technique using two liquid crystal display devices, there is one in which the two liquid crystal display devices are moved individually to produce an effect in which the two liquid crystal display devices are aligned exactly on the left and right. Then, one continuous display is performed by two liquid crystal display devices, or a sub display performed by these movable liquid crystal display devices is immersed in a main display performed by a large liquid crystal display device. However, when an effect that looks like a sub-display by one liquid crystal display device is expected, each frame can be seen at the joint portion of the two liquid crystal display devices, and the two sub-displays are clearly separated. End up. Further, since the frame of the liquid crystal display device is conspicuous, the effect that the sub display is immersed in the main display is lacking.

JP-A-8-136886

  The present invention provides an image display device capable of making a frame at a joint portion between two displays invisible.

  A video display device according to an aspect of the present invention includes a first liquid crystal display panel having a first frame, and a second liquid crystal display panel having a second frame arranged in a first direction with the first liquid crystal display panel. And first and second prism sheets disposed at a distance from the first and second liquid crystal display panels. The first prism sheet includes a first base and a plurality of first triangular prisms provided on the first base, and each of the plurality of first triangular prisms includes the first liquid crystal display panel and the first liquid crystal display panel. It has an inclined surface that inclines in a direction away from the joint with the second liquid crystal display panel. The second prism sheet includes a second base and a plurality of second triangular prisms provided on the second base, and each of the plurality of second triangular prisms is inclined in a direction away from the joint portion. Has an inclined surface. When the first and second liquid crystal display panels are viewed from the front through the first and second prism sheets, the first and second frame at the joint portion are not visible.

  A video display device according to an aspect of the present invention includes a first liquid crystal display panel having a first frame, and a second liquid crystal display panel having a second frame arranged in a first direction with the first liquid crystal display panel. And first and second prism sheets disposed at a distance from the first and second liquid crystal display panels. The first prism sheet includes a first base and a plurality of first triangular prisms provided on the first base, and each of the plurality of first triangular prisms includes the first liquid crystal display panel and the first liquid crystal display panel. It has an inclined surface that inclines in a direction away from the joint with the second liquid crystal display panel. The second prism sheet includes a second base and a plurality of second triangular prisms provided on the second base, and each of the plurality of second triangular prisms is inclined in a direction away from the joint portion. Has an inclined surface. When the first and second liquid crystal display panels are viewed obliquely by an angle θ through the first and second prism sheets, the first and second picture frames at the joint portion are not visible.

  ADVANTAGE OF THE INVENTION According to this invention, the video display apparatus which can make the frame in the joint part between two displays invisible can be provided.

1 is a block diagram of a video display device according to a first embodiment. The circuit diagram of the pixel array contained in a liquid crystal display device. The top view and sectional drawing of a liquid crystal display device. Sectional drawing of a prism sheet. The perspective view of a prism sheet. The top view when an observer looks at a liquid crystal display device through a prism sheet. Sectional drawing explaining the parameter of a prism sheet. The table | surface which shows an example of the inclination-angle of a triangular prism, and the deviation | shift amount of light. The top view of the liquid crystal display device which concerns on a 1st modification. The perspective view of the prism sheet which concerns on a 1st modification. The top view of the liquid crystal display device which concerns on a 2nd modification. The perspective view of the prism sheet which concerns on a 2nd modification. The schematic diagram of the video display apparatus which concerns on an Example. The schematic diagram of the video display apparatus concerning another Example. The schematic diagram of the video display apparatus concerning a comparative example. The figure explaining a mode that the liquid crystal display device of 1st Embodiment was seen from the diagonal direction only by angle (theta). The figure explaining a mode that the liquid crystal display device of 1st Embodiment was seen from the diagonal direction only by angle (theta). Sectional drawing explaining the parameter of the prism sheet which concerns on 2nd Embodiment. The table | surface which shows an example of angle (theta) in a prism sheet, and the deviation | shift amount of light. The perspective view of the liquid crystal display device comprised so that a joint part would not be visible when a screen is seen from the front. FIG. 21 is a diagram illustrating a state in which the liquid crystal display device illustrated in FIG. 20 is viewed from the right side by an angle θ. FIG. 6 is a diagram illustrating an image displayed by a liquid crystal display panel according to an example. The perspective view explaining a mode that the screen was seen from the front about the liquid crystal display device concerning an example. The perspective view explaining a mode that the liquid crystal display device which concerns on an Example looked at the screen from the right side by angle (theta).

  Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and ratios of the drawings are not necessarily the same as the actual ones. Further, even when the same portion is represented between the drawings, the dimensional relationship and ratio may be represented differently. In particular, the following embodiments exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of components. Is not specified. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.

[First Embodiment]
[1. Circuit configuration of video display device 10]
First, an example of the circuit configuration of the video display device 10 will be described. FIG. 1 is a block diagram of a video display apparatus 10 according to the first embodiment of the present invention. The video display device 10 includes a liquid crystal display device 11, scanning drivers (scanning line driving circuits) 12-1 and 12-2, signal drivers (signal line driving circuits) 13-1 and 13-2, and a common voltage supply circuit. 14, a voltage generation circuit 15, and a control circuit 16. In the present embodiment, an active matrix liquid crystal display device will be described as an example.

  The liquid crystal display device 11 includes a sub display device 11-1 and a sub display device 11-2. Each of the sub display devices 11-1 and 11-2 is provided with a plurality of scanning lines GL each extending in the row direction (X direction) and a plurality of signal lines SL each extending in the column direction (Y direction). Established. A pixel 17 is disposed in each of the intersecting regions of the plurality of scanning lines GL and the plurality of signal lines SL. The plurality of pixels 17 are arranged in a matrix.

  FIG. 2 is a circuit diagram of a pixel array included in the liquid crystal display device 11. In FIG. 2, four pixels are extracted and shown. The pixel 17 includes a switching element 18, a liquid crystal capacitor Clc, and a storage capacitor Cs. For example, a TFT (Thin Film Transistor) is used as the switching element 18.

  The source of the TFT 18 is electrically connected to the signal line SL. The gate of the TFT 18 is electrically connected to the scanning line GL. The drain of the TFT 18 is electrically connected to the liquid crystal capacitor Clc. The liquid crystal capacitor Clc includes a pixel electrode, a common electrode, and a liquid crystal layer sandwiched between them.

  The storage capacitor Cs is connected in parallel to the liquid crystal capacitor Clc. The storage capacitor Cs has a function of suppressing the potential fluctuation generated in the pixel electrode and holding the drive voltage applied to the pixel electrode until the drive voltage corresponding to the next signal is applied. The storage capacitor Cs includes a pixel electrode, a storage electrode (storage capacitor line), and an insulating film sandwiched between them. A common voltage Vcom is applied to the common electrode and the storage electrode by the common voltage supply circuit 14.

  In FIG. 1, the scanning driver 12-1 is connected to a plurality of scanning lines GL disposed in the sub display device 11-1 and receives a vertical control signal VS <b> 1 from the control circuit 16. The scan driver 12-1 applies a scan signal for controlling on and off of the TFT 18 included in the sub display device 11-1 to the scan line GL based on the vertical control signal VS1. The scanning driver 12-2 is connected to a plurality of scanning lines GL arranged in the sub display device 11-2, and receives a vertical control signal VS2 from the control circuit 16. The scan driver 12-2 applies a scan signal for controlling on and off of the TFT 18 included in the sub display device 11-2 to the scan line GL based on the vertical control signal VS2.

  The signal driver 13-1 is connected to a plurality of signal lines SL provided in the sub display device 11-1, and receives a horizontal control signal HS1 and display data DT1 from the control circuit 16. The signal driver 13-1 applies a grayscale signal (drive voltage) corresponding to the display data DT1 to the signal line SL based on the horizontal control signal HS1. The signal driver 13-2 is connected to a plurality of signal lines SL provided in the sub display device 11-2, and receives a horizontal control signal HS2 and display data DT2 from the control circuit 16. The signal driver 13-2 applies a gradation signal (drive voltage) corresponding to the display data DT2 to the signal line SL based on the horizontal control signal HS2.

  The common voltage supply circuit 14 generates a common voltage Vcom and supplies it to the sub display devices 11-1 and 11-2.

  The control circuit 16 receives image data DT from the outside. The control circuit 16 generates image data DT1 for the sub display device 11-1 and image data DT2 for the sub display device 11-2 based on the image data DT. The control circuit 16 sends the vertical control signals VS1 and VS2 to the scanning drivers 12-1 and 12-2, respectively, and also sends the horizontal control signals HS1 and HS2 and the image data DT1 and DT2 to the signal drivers 13-1 and 13-, respectively. Send to 2.

  The voltage generation circuit 15 receives power from the outside. The voltage generation circuit 15 generates a gate voltage necessary for generating a scanning signal and supplies it to the scanning drivers 12-1 and 12-2. Further, the voltage generation circuit 15 generates a drive voltage necessary for driving the pixel and supplies it to the signal drivers 13-1 and 13-2. In addition, the voltage generation circuit 15 generates various voltages necessary for the operation of the video display device 10 and supplies them to each circuit unit as necessary.

  In the video display device 10 configured as described above, when the TFT 18 included in an arbitrary pixel 17 is turned on, a driving voltage is applied to the pixel electrode via the signal line SL, and the voltage between the driving voltage and the common voltage Vcom is determined. The alignment state of the liquid crystal changes according to the difference. Thereby, the transmission state of the light incident on the sub display devices 11-1 and 11-2 from the light source unit (backlight) is changed, and image display is performed.

[2. Configuration of Liquid Crystal Display Device 11]
Next, the configuration of the liquid crystal display device 11 will be described. FIG. 3 is a plan view (a) and a sectional view (b) of the liquid crystal display device 11.

  In the plan view of FIG. 3A, the sub display device 11-1 includes a rectangular screen 21-1 and a rectangular frame 20-1 surrounding the periphery of the screen 21-1. The sub display device 11-2 includes a rectangular screen 21-2 and a rectangular frame 20-2 surrounding the periphery of the screen 21-2. The frame is an area in which an image is not displayed in the same plane as the screen. Images IM1 and IM2 are displayed on the screens 21-1 and 21-2, respectively. FIG. 3A shows semicircle images IM1 and IM2 as an example. In FIG. 3A, illustration of the prism sheets 25-1 and 25-2 illustrated in FIG. 3B is omitted.

  3B, the sub display device 11-1 includes a case 22-1, a light source unit (backlight unit) 23-1, a liquid crystal display panel 24-1, and a prism sheet 25-1. The light source unit 23-1 and the liquid crystal display panel 24-1 are accommodated in, for example, the case 22-1. The liquid crystal display panel 24-1 is disposed above the light source unit 23-1. The prism sheet 25-1 is disposed above the liquid crystal display panel 24-1 and is provided so as to be in contact with the upper part of the frame (edge) of the case 22-1. The prism sheet 25-1 has the same size (planar shape) as the liquid crystal display panel 24-1.

  More specifically, the liquid crystal display panel 24-1 includes a frame 24A-1 around the periphery, and the inside of the frame 24A-1 is a screen. The frame 24A-1 is a black portion light-shielded by the light-shielding film, and the peripheral circuit of the pixel array of the liquid crystal display panel 24-1 is arranged in the frame 24A-1. Similarly, the sub display device 11-2 includes a case 22-2, a light source unit 23-2, a liquid crystal display panel 24-2, and a prism sheet 25-2. In addition, the liquid crystal display panel 24-2 includes a frame 24A-2 around the liquid crystal display panel 24-2.

  The frame 20-1 in the plan view of FIG. 3A corresponds to a portion where the frame 24A-1 and the frame of the case 22-1 are combined in the cross-sectional view of FIG. Similarly, the frame 20-2 in the plan view of FIG. 3A corresponds to a portion where the frame 24A-2 and the frame of the case 22-2 are combined in the cross-sectional view of FIG. Note that the case for accommodating the liquid crystal display panel is not an essential element of the present invention, and therefore it is not necessary to particularly distinguish the frame of the liquid crystal display panel from the frame of the case, and an area (screen) in which an image is displayed. Means the frame of the liquid crystal display panel. Therefore, the frame 24A-1 and 4A-2 of the liquid crystal display panels 24-1 and 24-2 are the frame 20-1 of the sub display devices 11-1 and 11-2, respectively, unless otherwise specified. , 20-2. Further, the liquid crystal display panel 24-1 and the liquid crystal display panel 24-2 are directly connected to each other except for the frames of the cases 22-1 and 22-2 at the joint portion 26 between the liquid crystal display panel 24-1 and the liquid crystal display panel 24-2. An example in which the liquid crystal display device 11 is configured so as to be arranged in a line is also conceivable.

  FIG. 4 is a cross-sectional view of the prism sheets 25-1 and 25-2. FIG. 5 is a perspective view of the prism sheets 25-1 and 25-2.

  The prism sheet 25-1 includes a base (base) 25A-1 and a plurality of triangular prisms 25B-1 provided on the entire surface of the base 25A-1. The base 25A-1 has a rectangular cross section, and has the same rectangular planar shape as the outer shape of the sub display device 11-1. The plurality of triangular prisms 25B-1 are arranged side by side in the horizontal direction of the screen 21-1. Each triangular prism 25B-1 is composed of a triangular prism whose section is a right triangle. Similarly, the prism sheet 25-2 includes a base 25A-2 and a plurality of triangular prisms 25B-2 provided on the entire surface of the base 25A-2.

  The triangular prism 25B-1 and the triangular prism 25B-2 are arranged such that their inclined surfaces face each other. That is, the triangular prism 25B-1 has an inclined surface that is inclined toward a direction (left direction in the drawing) away from the central portion (portion where the sub display device 11-1 and the sub display device 11-2 are in contact). Further, the triangular prism 25B-2 has an inclined surface that inclines in a direction away from the center (right direction in the figure).

  The screen 21-1 and the screen 21-2 are arranged side by side through the joint portion 26. The liquid crystal display panel 24-1 and the liquid crystal display panel 24-2 can display one continuous image in cooperation. Of course, the liquid crystal display panel 24-1 and the liquid crystal display panel 24-2 can also display individual images. As described above, the control circuit 16 sends the image data DT1 to the sub display device 11-1, and sends the image data DT2 to the sub display device 11-2. When the sub display device 11-1 and the sub display device 11-2 display one continuous image, the control circuit 16 generates image data DT1 and DT2 for performing such display.

  The arrows in FIG. 4 indicate display light from the liquid crystal display panels 24-1 and 24-2. The display light from the liquid crystal display panel 24-1 is refracted at the interface of the base 25A-1 of the prism sheet 25-1 and the interface of the triangular prism 25B-1. Similarly, the display light from the liquid crystal display panel 24-2 is refracted at the interface of the base 25A-2 of the prism sheet 25-2 and the interface of the triangular prism 25B-2.

  FIG. 6 is a plan view when the observer views the liquid crystal display device 11 (including the sub display devices 11-1 and 11-2) via the prism sheets 25-1 and 25-2. An observer can see one frame 20 and one screen 21 of the liquid crystal display device 11. Further, it seems to the observer that one continuous image IM (circle in the example of FIG. 6) is displayed on one screen 21. That is, by refracting the display light of the sub display devices 11-1 and 11-2 using the prism sheets 25-1 and 25-2, the joint portion 26 can be made invisible to the observer.

  Below, the conditions of the prism sheets 25-1 and 25-2 and the frames 20-1 and 20-2 will be described. FIG. 7 is a cross-sectional view illustrating parameters of the prism sheet 25-2. The parameter conditions of the prism sheet 25-1 are only different in the direction of the inclined surface of the prism sheet 25-2, and the parameter conditions of the prism sheet 25-2 can be applied.

The parameters shown in FIG. 7 are as follows.
α: inclination angle of the triangular prism x: x coordinate of the triangular prism d ₁ : height of the triangular prism d ₂ : height of the base of the prism sheet D: distance between the prism sheet and the liquid crystal display panel x coordinate of the triangular prism Is the horizontal distance from the apex of the tilt angle (elevation angle). The prism sheets 25-1 and 25-2 are made of, for example, acrylic (refractive index n = 1.49 or so).

  The amount of shift Δ of the light after the display light emitted from the liquid crystal display panel 24-2 passes through the prism sheet 25-2 is expressed by the following equation (1).

Δ = (x · tan α + d ₂ ) · tan (α−β) + D · tan γ (1)
0 ≦ x <d ₁ / tanα
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}

The end of the frame 20-2 (the end of the prism sheet 25-2) is x = 0, and the light shift amount Δ0 in the case of x = ₀ is derived from the following equation (2) from the equation (1). It is burned.

Δ ₀ = d ₂ · tan (α−β) + D · tan γ (2)
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}

Figure 8 is a table showing an example of the shift amount delta ₀ tilt angle α and the light of the triangular prism. In FIG. 8, d ₁ = 0.25 mm, d ₂ = 1.75 mm, D = 15 mm, and n = 1.49 are used as an example.

For example, when α = 40 °, the amount of light deviation Δ ₀ is 6.46 mm as shown in FIG. Therefore, when the width of each of the frames 20-1 and 20-2 is 6.46 mm in the joint portion 26 (when the combined width of the frames 20-1 and 20-2 is 12.92 mm), the joint portion 26 is just invisible. That is, the display in FIG. 6 can be realized.

  Accordingly, the width W1 of each of the frames 20-1 and 20-2 in the joint portion 26 is set so as to satisfy the following expression (3).

W1 ≦ Δ ₀ = d ₂ · tan (α−β) + D · tan γ (3)
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}

By setting the width W1 of each of the frames 20-1 and 20-2 so as to satisfy Expression (3), it is possible to realize a state where the joint portion 26 cannot be seen by the observer. Actually, it is desirable that W1 is equal to or equal to the right side, or is smaller than the right side by, for example, a value considering manufacturing error. In the formula (3), the height d ₁ of the triangular prism is not included in the conditions of the delta _0. As d ₁ is reduced, the number of triangular prisms required increases, and as d ₁ is increased, the number of triangular prisms required decreases. Since d ₁ affects the overall height of the prism sheet, it is appropriately designed according to the required specifications.

[3. Modified example]
In the above description, the frame between the sub display devices 11-1 and 11-2 is made invisible. However, by implementing the same design on the periphery of each of the sub display devices 11-1 and 11-2, The frame around the liquid crystal display device 11 can be made invisible.

  FIG. 9A is a plan view of the liquid crystal display device 11 according to the first modification. In FIG. 9A, the prism sheet is not shown. FIG. 10 is a perspective view of the prism sheets 25-1 and 25-2 according to the first modification. The sub display devices 11-1 and 11-2 include the prism sheets 25-1 and 25-2 shown in FIG.

  The prism sheet 25-1 includes a base 25A-1 and a plurality of triangular prisms 25B-1. Each triangular prism 25B-1 is disposed at an end portion (at least an upper portion of the frame 20-1) of the sub display device 11-1, and is formed in a rectangular shape. In other words, the triangular prism 25B-1 is composed of four triangular prisms arranged on the four sides of the sub display device 11-1. The triangular prism 25B-1 has an inclined surface that is inclined toward the inner side (center) of the prism sheet 25-1.

  In FIG. 10, the triangular prism 25B-1 is provided on the periphery of the base 25A-1, but the triangular prism 25B-1 is provided on the entire surface of the base 25A-1 toward the center of the base 25A-1. Also good. In FIG. 10, the corners of the square triangular prism 25B-1 are rounded. However, this shape is an example, and the corners of the triangular prism 25B-1 may be a right angle. Further, only three triangular prisms are shown in order to avoid complicated drawings, but actually, more triangular prisms are arranged.

  FIG. 9B is a plan view when the observer looks at the liquid crystal display device 11 (including the sub display devices 11-1 and 11-2). By refracting the display light of the sub display devices 11-1 and 11-2 using the prism sheets 25-1 and 25-2, the joint of the sub display devices 11-1 and 11-2, and The frame on the outer periphery of each of the sub display devices 11-1 and 11-2 can be made invisible.

  FIG. 11A is a plan view of a liquid crystal display device 11 according to a second modification. In the second modification, the screen of the liquid crystal display device 11 is divided into four. The liquid crystal display device 11 includes four sub display devices 11-1 to 11-4. Each of the sub display devices 11-1 to 11-4 has the same configuration as the sub display device 11-1 or 11-2 described above. In FIG. 11A, the prism sheet is not shown.

  Each of the sub display devices 11-1 to 11-4 includes prism sheets 25-1 to 25-4. FIG. 12 is a perspective view of prism sheets 25-1 to 25-4 according to the second modification. Each of the prism sheets 25-1 to 25-4 has the same configuration as the prism sheet 25-1 or 25-1 shown in the first modified example, except that the sizes are different.

  FIG. 11B is a plan view when the observer looks at the liquid crystal display device 11 (including the sub display devices 11-1 to 11-4). By refracting the display light of the sub display devices 11-1 to 11-4 using the prism sheets 25-1 to 25-4, the joint portion of the sub display devices 11-1 to 11-4, and The frame on the outer periphery of each of the sub display devices 11-1 to 11-4 can be made invisible.

[4. Example]
FIG. 13 is a schematic diagram of the video display apparatus 10 according to the embodiment. The video display device 10 includes a liquid crystal display device 31 and a liquid crystal display device 11 (including sub display devices 11-1 and 11-2). The liquid crystal display device 31 is a general liquid crystal display device that displays a main image.

  The sub display devices 11-1 and 11-2 function as a movable accessory (gimmick). That is, the video display device 10 includes a drive unit (not shown) that mechanically moves the sub display devices 11-1 and 11-2.

  As shown in FIG. 13A, since the sub display devices 11-1 and 11-2 include prism sheets 25-1 and 25-2, respectively, the frame of the sub display devices 11-1 and 11-2. Is invisible to the observer. The sub display devices 11-1 and 11-2 are arranged apart from each other. Subsequently, as illustrated in FIG. 13B, the sub display devices 11-1 and 11-2 are moved to the central portion of the liquid crystal display device 31 and are arranged side by side and in contact with each other. In this case, the joint portion and the gap between the sub display devices 11-1 and 11-2 are hardly visible.

  Thereby, the liquid crystal display device 11 can display one continuous image. In addition, the image of the liquid crystal display device 11 can be effectively immersed in the main image of the liquid crystal display device 31. Further, even when the frames of the sub display device 11-1 and the sub display device 11-2 are enlarged in order to reduce the impact when the sub display device 11-1 and the sub display device 11-2 come into contact with each other, the observation is performed. Can hide the picture frame from the person.

  FIG. 14 is a schematic diagram of a video display apparatus 10 according to another embodiment. In FIG. 14A, the liquid crystal display device 11 (including the sub display devices 11-1 and 11-2) is disposed at the center of the liquid crystal display device 31, and the sub display devices 11-1 and 11-2. Are arranged side by side and in contact with each other. At this time, the frames of the sub display devices 11-1 and 11-2 are not visible to the observer. Subsequently, as shown in FIG. 14B, the sub display devices 11-1 and 11-2 move up and down so as to be separated from each other.

  Next, a comparative example will be described. FIG. 15 is a schematic diagram of a video display device 30 according to a comparative example. The video display device 30 includes a liquid crystal display device 31, and sub display devices 32-1 and 32-2. Each of the sub display devices 32-1 and 32-2 includes a liquid crystal display device, but does not include the prism sheet of the present embodiment. The sub display devices 32-1 and 32-2 are provided with frames 33-1 and 33-2, respectively. The viewer can see the frames 33-1 and 33-2 of the sub display devices 32-1 and 32-2 as they are.

  As shown in FIG. 15A, the sub display devices 32-1 and 32-2 are arranged apart from each other. Subsequently, as illustrated in FIG. 15B, the sub display devices 32-1 and 32-2 are moved to the central portion of the liquid crystal display device 31 and are arranged side by side and in contact with each other. In this case, the joint between the sub display devices 32-1 and 32-2 is visible. In addition, one image displayed by the sub display devices 32-1 and 32-2 is interrupted at a joint portion between the sub display devices 32-1 and 32-2. Furthermore, since the frame on the outer periphery of the sub display devices 32-1 and 32-2 is visible to the observer, the images of the sub display devices 32-1 and 32-2 are immersed in the main image of the liquid crystal display device 31. I can't see.

  In particular, when the sub display devices 32-1 and 32-2 are used as a movable accessory, the sub display device is reduced in order to reduce an impact when the sub display device 32-1 and the sub display device 32-2 are in contact with each other. The frame between 32-1 and the sub display device 32-2 may be enlarged. When such measures are taken, the joint between the sub display device 32-1 and the sub display device 32-2 becomes larger, so that the images displayed by the sub display device 32-1 and the sub display device 32-2 are displayed. This reduces the sense of unity.

[5. effect]
As described above in detail, in the first embodiment, the video display device 10 is arranged in the first direction with the liquid crystal display panel 24-1 including the frame 24A-1, and the liquid crystal display panel 24-1, and the frame 24A. Liquid crystal display panel 24-1 and prism sheets 25-1 and 25-2 arranged at a distance from the liquid crystal display panels 24-1 and 24-2. The prism sheet 25-1 includes a base 25A-1 and a plurality of triangular prisms 25B-1 provided on the base 25A-1, and each of the plurality of triangular prisms 25B-1 includes a liquid crystal display panel 24-1. And the liquid crystal display panel 24-2 have an inclined surface inclined in a direction away from the joint portion 26. The prism sheet 25-2 includes a base 25A-2 and a plurality of triangular prisms 25B-2 provided on the base 25A-2. Each of the plurality of triangular prisms 25B-2 is connected to the joint portion 26. It has an inclined surface which inclines in the direction of leaving. The parameters of the prism sheets 25-1 and 25-2 and the widths of the frames 24A-1 and 24A-2 are the same as those of the liquid crystal display panels 24-1 and 24-2 via the prism sheets 25-1 and 25-2. When viewed from the front, the frames 24A-1 and 24A-2 in the joint portion 26 are set so as not to be seen.

  Therefore, according to the first embodiment, when the liquid crystal display panel 24-1 and the liquid crystal display panel 24-2 are arranged side by side, for example, the frames 24A-1 and 24A-2 in the joint portion 26 are displayed on the viewer. Can be invisible. Thereby, it becomes possible to perform more effective display and production by using the video display device of this embodiment as a movable accessory. For example, what is thought to be one continuous display is suddenly divided into two, so that a sense of impact and a sense of surprise can be further produced.

  In addition, since the frame is not visible, a larger screen can be realized using two small liquid crystal display panels.

  Further, in order to reduce the impact when the liquid crystal display panel 24-1 and the liquid crystal display panel 24-2 come into contact with each other, the widths of the frames 24A-1 and 24A-2 can be increased. Even when the widths of -1 and 24A-2 are increased, the frames 24A-1 and 24A-2 can be made invisible.

  Further, the frame other than the joint portion 26 can be made invisible. Thereby, the sub image generated by the liquid crystal display panels 24-1 and 24-2 can be effectively immersed in the main image.

[Second Embodiment]
In the configuration described in the first embodiment, when viewing the screen from the front of the liquid crystal display device 11, the observer cannot see the joint between the sub display device 11-1 and the sub display device 11-2. However, as shown in FIGS. 16 and 17, when the screens 21-1 and 21-2 are viewed from an oblique direction by an angle θ, the joint portion 26 (specifically, the liquid crystal display panel 24-2 The frame 24A-2) will be visible. Therefore, in the second embodiment, the video display device 10 is configured so that the joint between the sub display device 11-1 and the sub display device 11-2 cannot be seen even when the screen is viewed from an oblique direction by the angle θ. To do.

[1. Configuration of Liquid Crystal Display Device 11]
FIG. 18A is a cross-sectional view illustrating parameters of the prism sheet 25-1, and FIG. 18B is a cross-sectional view illustrating parameters of the prism sheet 25-2. Hereinafter, the optical path of the display light when the liquid crystal display device 11 is viewed from the right side of the screen by the angle θ will be described.

Deviation amount delta _L of the light after the display light emitted from the liquid crystal display panel 24-1 is transmitted through the prism sheet 25-1 is represented by the following formula (4).

_{△ L = (x · tanα +} d 2) · tan (α-β L) + D · tanγ L ··· (4)
0 ≦ x <d ₁ / tanα
β _L = sin ⁻¹ {(1 / n) · sin (α−θ)}
γ _L = sin ⁻¹ {n · sin (α−β _L )}

Further, the deviation amount delta _R of the light after the display light emitted from the liquid crystal display panel 24-2 is transmitted through the prism sheet 25-2 is represented by the following formula (1).

_{△ R = (x · tanα +} d 2) · tan (α-β R) + D · tanγ R ··· (5)
0 ≦ x <d ₁ / tanα
β _R = sin ⁻¹ {(1 / n) · sin (α + θ)}
γ _R = sin ⁻¹ {n · sin (α−β _R )}

When the liquid crystal display device 11 is viewed from the right side of the screen by the angle θ, the frame visible to the observer is the frame 24A-2 of the liquid crystal cover panel 24-2. The following equation (6) is derived from the equation (5) for the amount of light deviation _Δ0R in the case of x = 0.

_Δ0R = d ₂ · tan (α−β _R ) + D · tan γ _R (6)
β _R = sin ⁻¹ {(1 / n) · sin (α + θ)}
γ _R = sin ⁻¹ {n · sin (α−β _R )}

Figure 19 (a) is a table showing an example of the angle θ and the light amount of deviation delta _0L in the prism sheet 25-1, FIG. 19 (b), deviation of the angle θ and the light in the prism sheet 25-2 It is a table _| surface which shows an example with quantity (DELTA) _0R . In FIG. 19, α = 40 °, d ₁ = 0.25 mm, d ₂ = 1.75 mm, D = 15 mm, and n = 1.49 are used as an example.

If for example, theta = 20 °, the deviation amount delta _0R light becomes 1.89mm as shown in FIG. 19 (b). Therefore, when the liquid crystal display device 11 is configured using the above-described parameter values, when the width of the frame 20-2 in the joint portion 26 is 1.89 mm, the joint portion 26 is not visible.

Therefore, when viewed by an angle θ from the right side of the screen of the liquid crystal display device 11, the width W2 _R of the frame 20-1 in the joint portion 26, is set to satisfy the following equation (7).

_{W2 R ≦ Δ 0R = d 2} · tan (α-β R) + D · tanγ R ··· (7)
β _R = sin ⁻¹ {(1 / n) · sin (α + θ)}
γ _R = sin ⁻¹ {n · sin (α−β _R )}

To satisfy equation (7), by setting the width W2 _R of the frame 20-1, when viewed by an angle θ from the right side of the screen of the liquid crystal display device 11, a state where the joint portion 26 is not visible from the observer realizable.

Moreover, when the liquid crystal display device 11 is viewed from the left side of the screen by the angle θ by setting the width W2 _L of the frame 20-2 at the joint portion 26 to the same width W2 _R as the above equation (7), A state in which the joint portion 26 is not visible can be realized.

[2. Example]
FIG. 20 is a perspective view of the liquid crystal display device 11 configured such that the joint portion is not visible when the screen is viewed from the front. As shown in FIG. 20, when the liquid crystal display device 11 is designed on the assumption that the observer views the screen from the front, the frames 24A-1 and 24A-2 of the liquid crystal display panels 24-1 and 24-2 are observed. Invisible to the person. At this time, images obtained by dividing one continuous image in half are used as the images IM1 and IM2 of the liquid crystal display panels 24-1 and 24-2.

  FIG. 21 is a diagram for explaining a state where the liquid crystal display device 11 shown in FIG. 20 is viewed from the right side by an angle θ. In FIG. 21, the frame 24A-2 of the liquid crystal display panel 24-2 is visible to the observer.

  Hereinafter, an example of the liquid crystal display device 11 configured so that the joint portion is not visible both when the screen is viewed from the front and when the screen is viewed obliquely by the angle θ will be described.

  FIG. 22 is a diagram illustrating images displayed by the liquid crystal display panels 24-1 and 24-2 according to the embodiment. In FIG. 22, the frames corresponding to the frames of the cases 22-1 and 22-2 are included in the frames 24 </ b> A- 1 and 24 </ b> A- 2 of the liquid crystal display panels 24-1 and 24-2. . The image IM1 displayed on the liquid crystal display panel 24-1 and the image IM2 displayed on the liquid crystal display panel 24-2 are configured such that the images on the joint portion side partially overlap. In FIG. 22, the area AR1 of the image IM1 and the area AR2 of the image IM2 overlap.

  FIG. 23 is a perspective view illustrating how the liquid crystal display device 11 according to the embodiment is viewed from the front. In the example of FIG. 23, compared to the example of FIG. 20, the liquid crystal display panels 24-1 and 24-2 are separated from the prism sheets 25-1 and 25-2 by increasing the distance between the liquid crystal display panels 24-1 and 24-2. -2 frame 24A-1 and 24A-2 are made invisible to the observer. In FIG. 23, the observer can see one continuous image by using images other than the areas AR1 and AR2.

  FIG. 24 is a perspective view illustrating how the liquid crystal display device 11 according to the embodiment is viewed from the right side by an angle θ. The observer can see one continuous image by using the area AR2 of the image IM2.

  The control circuit 16 generates image data DT1 and DT2 for displaying the images IM1 and IM2 shown in FIG. Then, the control circuit 16 sends the image data DT1 to the sub display device 11-1 (liquid crystal display panel 24-1), and sends the image data DT2 to the sub display device 11-2 (liquid crystal display panel 24-2).

  Next, conditions regarding the width of the overlapping area of the image will be described. The width of the area AR1 of the image IM1 is the same as the width of the area AR2 of the image IM2, and is denoted here as W3.

The overlap width W3 is obtained by subtracting “the amount of light deviation Δ _0R when viewing the screen from the right side by an angle θ in FIG. 24” from “the amount of light deviation Δ ₀ when viewing the screen from the front in FIG. 23”. It is calculated based on the obtained value. That is, the overlap width W3 is expressed by the following formula (8).

W3 ≧ d ₂ {tan (α−β) −tan (α−β _R )} + D (tan γ−tan γ _R ) (8)
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}
β _R = sin ⁻¹ {(1 / n) · sin (α + θ)}
γ _R = sin ⁻¹ {n · sin (α−β _R )}

Actually, it is desirable that W3 is equal or approximate to the right side, or is larger than the right side by, for example, a value considering manufacturing error. The control circuit 16 generates the image data DT1 and DT2 so as to satisfy Expression (3). This makes it possible to prevent the joint from being seen both when the screen is viewed from the front and when the screen is viewed obliquely by the angle θ.

[3. effect]
As described above in detail, according to the second embodiment, the frames 24A-1 and 24A-2 in the joint portion 26 are not only viewed when the screen is viewed from the front but also when viewed from the oblique direction by the angle θ. It can be made invisible to the observer.

  Moreover, one continuous image can be displayed by displaying two images IM1 and IM2 partially overlapping on the liquid crystal display panels 24-1 and 24-2.

  Note that a modification of the first embodiment can be applied to the second embodiment.

  Each of the above embodiments can be applied particularly to a pachinko machine as a gaming machine and a slot machine. However, each of the above embodiments is not limited to a gaming machine, and can be applied to all video display devices having a configuration in which two or more liquid crystal display panels are always or temporarily arranged side by side.

  The present invention is not limited to the above embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiments, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.

  DESCRIPTION OF SYMBOLS 10 ... Video display device, 11 ... Liquid crystal display device, 12 ... Scan driver, 13 ... Signal driver, 14 ... Common voltage supply circuit, 15 ... Voltage generation circuit, 16 ... Control circuit, 17 ... Pixel, 18 ... Switching element, 20 DESCRIPTION OF SYMBOLS ... Frame, 21 ... Screen, 22 ... Case, 23 ... Light source part, 24 ... Liquid crystal display panel, 24A ... Frame, 25 ... Prism sheet, 25A ... Base, 25B ... Triangular prism, 26 ... Seam part, 30 ... Video display device , 31, 32 ... Liquid crystal display device, 33 ... Picture frame.

Claims (7)

A first liquid crystal display panel comprising a first frame;
A second liquid crystal display panel arranged in a first direction with the first liquid crystal display panel and having a second frame;
First and second prism sheets respectively disposed at a distance from the first and second liquid crystal display panels;
Comprising
The first prism sheet includes a first base and a plurality of first triangular prisms provided on the first base, and each of the plurality of first triangular prisms includes the first liquid crystal display panel and the first liquid crystal display panel. Having an inclined surface inclined in a direction away from the joint portion with the second liquid crystal display panel;
The second prism sheet includes a second base and a plurality of second triangular prisms provided on the second base, and each of the plurality of second triangular prisms is inclined in a direction away from the joint portion. Has an inclined surface,
An image display device, wherein the first and second picture frames at the joint portion are not visible when the first and second liquid crystal display panels are viewed from the front through the first and second prism sheets. When the inclination angle α of each of the first and second triangular prisms, the height d ₂ of each of the first and second bases, the refractive index n of the first and second prism sheets, and the distance D,
The width W1 of each of the first and second picture frames at the joint portion is:
W1 ≦ d ₂ · tan (α−β) + D · tanγ
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}
The video display device according to claim 1, wherein: A first liquid crystal display panel comprising a first frame;
A second liquid crystal display panel arranged in a first direction with the first liquid crystal display panel and having a second frame;
First and second prism sheets respectively disposed at a distance from the first and second liquid crystal display panels;
Comprising
The first prism sheet includes a first base and a plurality of first triangular prisms provided on the first base, and each of the plurality of first triangular prisms includes the first liquid crystal display panel and the first liquid crystal display panel. Having an inclined surface inclined in a direction away from the joint portion with the second liquid crystal display panel;
The second prism sheet includes a second base and a plurality of second triangular prisms provided on the second base, and each of the plurality of second triangular prisms is inclined in a direction away from the joint portion. Has an inclined surface,
The first and second picture frames in the joint portion are not visible when the first and second liquid crystal display panels are viewed through the first and second prism sheets obliquely by an angle θ. Display device. When the inclination angle α of each of the first and second triangular prisms, the height d ₂ of each of the first and second bases, the refractive index n of the first and second prism sheets, and the distance D,
The width W2 of each of the first and second picture frames at the joint portion is:
W2 ≦ d ₂ · tan (α−β _R ) + D · tan γ _R
β _R = sin ⁻¹ {(1 / n) · sin (α + θ)}
γ _R = sin ⁻¹ {n · sin (α−β _R )}
The video display device according to claim 3, wherein: A control circuit for sending image data to the first and second liquid crystal display panels;
Each of the images of the first and second liquid crystal display panels includes an overlapping region disposed on the joint portion side,
The width W3 of the overlapping region is
W3 ≧ d ₂ {tan (α−β) −tan (α−β _R )} + D (tan γ−tan γ _R )
β = sin ⁻¹ {(1 / n) · sin α}
γ = sin ⁻¹ {n · sin (α−β)}
The video display device according to claim 4, wherein: The first prism sheet is provided above the first frame other than the joint, and includes a plurality of triangular prisms inclined toward the center of the first base,
The said 2nd prism sheet is provided above 2nd frame other than the said joint part, and is provided with the some triangular prism which inclines toward the center of the said 2nd base. The video display device described in 1.   The video display device according to claim 1, wherein the first and second liquid crystal display panels are movable accessories.

Images