JP5100282B2 - Display device - Google Patents

Description

  The present invention relates to a display device that includes a multilayer display panel and displays a three-dimensional stereoscopic image.

Conventionally, a three-dimensional display device that displays a three-dimensional stereoscopic image to an observer by arranging a plurality of display panels (for example, liquid crystal display panels) at different depth positions as viewed from the observer is known.
As such a three-dimensional display device, in order to prevent the occurrence of moire (interference fringes) due to the interference of pixel patterns of each display panel, a diffusion plate is arranged between a plurality of display panels. (For example, refer to Patent Document 1).

Further, in the three-dimensional display device, each display panel has a plurality of pixels, and at least one of the plurality of display panels is disposed on the side close to the observer, and a wall perpendicular to the surface of the display panel, It is also known that a diffusing plate disposed on the side closer to the observer is provided to prevent the occurrence of moiré without reducing the display resolution (see, for example, Patent Document 2).
Japanese Patent No. 3335998 Specification JP 2004-336290 A

However, since the display device normally uses one source substrate for one display panel, when a plurality of display panels are provided as in the conventional three-dimensional display device, each display Since one source substrate is required for each panel, the cost increases. Therefore, in such a three-dimensional display device, it is desired to reduce the cost as much as possible.
Therefore, an object of the present invention is to provide a display device that can display a three-dimensional stereoscopic image at low cost.

In order to solve the above-described problem, in a display device that displays a three-dimensional stereoscopic image, a first display panel having pixels capable of displaying a plurality of colors in a pixel region where an image is displayed, and the pixel region being a first display panel A second display panel that is formed in the same pixel arrangement as the first display panel and is aligned so that the corresponding pixels overlap with the first display panel , and is stacked on the lower side of the first display panel as viewed from the observer; A first drive signal is generated based on a first display signal that is disposed along one side of the first display panel and is connected to the first display panel and input through a first connector connected to an external signal source. A first control circuit board that outputs a first drive signal to the first display panel, and a second control circuit board that is disposed to overlap the lower side of the first control circuit board along one side of the second display panel . It is connected to the display panel, connected to an external signal source Second connector generates a second drive signal based on the second display signal to be input via a and a second control circuit board for outputting a second driving signal to the second display panel, the being, the 2 control circuit board, at least a second connector so as not to overlap with the first control circuit board, to the first control circuit board are arranged offset in a plan view, display equipment is provided.

Thereby, since two display panels can be made into the same panel specification, it is not necessary to manufacture the panel of a different specification, and the cost can be reduced by that .

Further , the specifications of the display panel (LCD or substrate) can be made the same, and only one type of display panel can be used in one display device. Furthermore, the specification of the wiring member (for example, FPC) for connecting the display panel and the control circuit board can be made the same for each display panel, and a cost merit can be obtained .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a liquid crystal module constituting the display device of this embodiment.
As shown in FIG. 1, the liquid crystal module 1 includes a backlight unit 100 and a panel unit 200.
The backlight unit 100 includes a back cover 10 and a backlight 20, and the panel unit 200 includes a lower panel 30, a lower case 40, a diffusion plate 50, an upper case 60, an upper panel 70, and a front panel. The cover 80 is composed of source substrates 90A and 90B. In the liquid crystal module 1, the front cover 80 side is the front surface and the back cover side is the back surface.

The upper panel 70 and the lower panel 30 are liquid crystal panels made of a transparent insulating material, for example, a glass substrate. These panels 70 and 30 are arranged so that two substrates are opposed to each other at a predetermined interval, Is adhered with a sealing material, liquid crystal is sealed, and polarizing plates are attached to the upper and lower surfaces.
As described above, the display device according to the present embodiment has a multi-layer arrangement in which two liquid crystal panels are arranged at different depth positions as viewed from the observer. For example, a moving image of a vehicle or the like is displayed on the upper panel 70, and By displaying a background image on the panel 30, a three-dimensional stereoscopic image can be displayed.

The back cover 10 is made of, for example, a metal plate, and has four side walls that define a fixed storage space in which the backlight 20 and the panel unit 200 excluding the front cover 80 can be stored.
The backlight 20 includes a well-known light source, a reflection sheet, and a light guide plate (not shown). Light from the light source is incident on the light guide plate, and the light guide plate emits the light toward the panel unit 200 which is the surface of the light guide plate. Further, the reflection sheet is disposed on the back surface of the light guide plate so that light incident from the light guide plate incident surface does not exit from a surface other than the light guide plate surface.

FIG. 2 is a schematic configuration diagram of the lower panel 30 and the upper panel 70, and is a view of each panel as viewed from the front. In this embodiment, since the lower panel 30 and the upper panel 70 have the same configuration, the upper panel 70 will be described as a representative here.
As described above, the upper panel 70 is composed of two upper and lower substrates and a liquid crystal layer filled therebetween. Of the upper and lower substrates, two sides of the lower substrate (the short side on the left side and the long side on the upper side in FIG. 2) protrude from the upper substrate, and a plurality of driver ICs 71 are mounted on the protruding portion. Furthermore, a required drive signal is supplied to the driver IC 71 for driving from the source substrate 90A by a flexible printed circuit board (hereinafter referred to as FPC) 72.

Here, the connecting portion between the FPC 72 and the source substrate 90A and the connecting portion between the FPC 72 and the upper panel 70 are connected by pressure contact, pressure bonding, or connector connection, respectively.
Similarly, a required drive signal from the source substrate 90 </ b> B is supplied by the FPC 32 to the plurality of driver driver ICs 31 mounted on the lower panel 30.

In the present embodiment, the source substrates 90A and 90B are both arranged on the upper part of the panel. Thus, by making the connection position of each source substrate the same in each panel, the lower panel 30 and the upper panel 70 can have the same panel specification.
Here, the same panel specification means that the LCD and the substrate are the same, and does not mean the same type of polarizing plate attached to the panel. That is, of the two display panels, the polarizing plate of one panel may be an NV polarizing plate, and the polarizing plate of the other panel may be a WV polarizing plate.

  The upper panel 70 is provided with a pixel region 73 for displaying an image, and the lower substrate includes a plurality of scanning lines and a plurality of data lines orthogonal to each other, and each scanning line and each data line. A plurality of pixels provided corresponding to the intersection are arranged. In each pixel, a switching element made of a thin film transistor (TFT) is formed and a pixel electrode connected to the switching element is formed.

A common electrode facing the pixel electrode is disposed on the upper substrate. A liquid crystal layer sandwiched between the pixel electrode and the common electrode is driven for each pixel.
The gate of the TFT disposed in each pixel is connected to the scanning line, the source of the TFT is connected to the data line, and the drain of the TFT is connected to the storage capacitor and the pixel electrode. In this TFT, when a selection voltage is applied via the scanning line, the data line, the pixel electrode, and the storage capacitor are brought into conduction.

In the present embodiment, one pixel group 74 corresponding to dots for displaying an image is formed by arranging pixels (R, G, B) having three hues adjacent to each other in one pixel row. It is composed.
Here, the upper panel 70 and the lower panel 30 have the same pixel arrangement. Specifically, the upper panel 70 and the lower panel 30 have a pixel pitch that is set to be substantially equal, and are aligned and stacked in a state in which the arrangement order of color display is also superimposed on the plane. . Further, it is assumed that the upper panel 70 and the lower panel 30 have the same driving direction in the row direction and the column direction.

  An optical sheet such as a diffusion sheet (not shown) or two lens sheets is disposed on the back surface of the lower panel 30. The diffusion sheet also serves to further scatter and make uniform the light that cannot be made uniform by the diffusion pattern of the light guide plate of the backlight 20. The light guided in this way is collected by two lens sheets and guided to the lower panel 30. Similarly, optical sheets such as a diffusion sheet and two lens sheets (not shown) are also arranged on the back surface of the upper panel 70.

The diffusion sheet and the lens sheet are not limited to the number of sheets and the stacking order as long as sufficient brightness can be obtained for the panel.
3A and 3B are diagrams showing the assembled state of the upper panel 70 and the lower panel 30. FIG. 3A is a diagram of the panel viewed from the top surface, and FIG. 3B is a diagram of the panel viewed from the side surface. Here, in order to simplify the description, the lower case 40 and the diffusion plate 50 are omitted.

The source substrate 90A generates a drive signal based on a display signal (display signal for the upper panel 70) from an external signal source input from the input connector 91A, and outputs this to the FPC 72.
Similarly, the source substrate 90B generates a drive signal based on a display signal (display signal for the lower panel 30) from the external signal source input from the input connector 91B, and outputs this to the FPC 32.

As shown in FIG. 1, the upper case 60 includes a frame-shaped frame portion 61 having a through hole formed in the center, and one side of the frame portion 61 (the upper side of the frame portion 61 in FIG. 1). The substrate receiving portion 62 extends in the thickness direction and supports the source substrate 90A.
As shown in FIG. 3B, the source substrate 90A is screwed to the substrate receiving portion 62 of the upper case 60 by bending the FPC 72 at a substantially right angle as shown in FIG. In FIG. 3, the frame portion 61 of the upper case 60 is omitted.

A guide portion 62a is formed at an end portion of the substrate receiving portion 62 so as to protrude in a direction perpendicular to the substrate receiving surface, and the bent portion of the FPC 72 has a certain degree of bending by the guide portion 62a. The source substrate 90A is positioned.
Further, as shown in FIG. 3B, the source substrate 90B is screwed to the substrate receiving portion 22 formed on the side surface of the backlight 20 by bending the FPC 32 at a substantially right angle as shown in FIG.

A guide portion 22a is formed at an end portion of the substrate receiving portion 22 so as to protrude in a direction perpendicular to the substrate receiving surface, and the bent portion of the FPC 32 has a certain degree of bending by the guide portion 22a. The source substrate 90B is positioned.
Further, as shown in FIG. 3A, the source substrate 90A and the source substrate 90B are arranged so as to be shifted so that only a part thereof overlaps in plan view. In this manner, by arranging the source substrate 90B so as to expose a part of the source substrate 90B during assembly, the volume of the source substrate 90B can be adjusted before shipment.

Returning to FIG. 1, a frame-shaped lower case 40 having a through hole formed in the center is disposed on the front surface of the lower panel 30, and the diffusion plate 50 is supported by the lower case 40. An upper case 60 is disposed on the front surface of the diffusion plate 50, and the upper panel 70 is supported by the upper case 60. Here, it is assumed that the lower case 40 and the upper case 60 are made of, for example, a resin material.
The diffusion plate 50 is disposed between the upper panel 70 and the lower panel 30 with a predetermined distance from both panels.

That is, a predetermined interval is secured between the lower panel 30 and the diffusion plate 50 according to the thickness of the lower case 40 disposed on the front surface of the lower panel 30, and the upper case 60 disposed on the front surface of the lower case 40. A predetermined distance is secured between the upper panel 70 and the diffusion plate 50 depending on the thickness of the frame portion 61.
As described above, by arranging the diffusion plate 50 between the upper panel 70 and the lower panel 30, it is possible to prevent the pixel patterns of the upper panel 70 and the lower panel 30 from interfering with each other to generate moire (interference fringes). is doing. The predetermined interval is set so that the diffusing plate 50 is disposed at a position where moire disappears properly.

In FIG. 1, a lower panel 30 and an upper panel 70 correspond to the first display panel and the second display panel, and source substrates 90A and 90B correspond to the first control circuit substrate and the second control circuit substrate.
When assembling the liquid crystal module 1 having such a configuration, first, the lower panel 30, the lower case 40, the diffusion plate 50, the upper case 60, and the upper panel 70 are stacked in this order from the front surface of the backlight 20. Thereafter, the back cover 10 is covered from the back side, the front cover 80 is covered from the front side, and the liquid crystal module 1 is completed by fixing with a fastening member 81 such as a screw.

By the way, the display device can be commercialized even if the source substrate is arranged on either the upper side or the lower side of the display panel.
FIG. 4 is a diagram showing the arrangement position of the source substrate in the display device using one display panel, and FIG. 5 is a diagram showing the arrangement position of the source substrate in the display device using two display panels. is there.

In the case of a display device in which one display panel 1070 is arranged on the front surface of the backlight 1020, as shown in FIG. 4A, even if the source substrate 90A is connected to the upper part of the display panel 1070 via the FPC 1072, As shown in FIG. 4B, even if the source substrate 90A is connected to the lower side of the display panel 1070 via the FPC 1072, there is no cost demerit.
As shown in FIG. 5, in the case of a display device in which two display panels 1030 and 1070 are arranged on the front surface of the backlight 1020, one source substrate 90A is connected to the upper portion of the upper display panel 1070 via the FPC 1072. Even if the other source substrate 90B is connected to the lower side of the lower display panel 1030 via the FPC 1032, the product can be commercialized. However, in this case, since display panel specifications and source substrate specifications cannot be shared, two display panels having different specifications are used, and cost merit cannot be obtained.

On the other hand, in this embodiment, the two display panels are aligned and stacked in a state in which the pixel pitch is made equal and the arrangement order of the color display is overlapped in the same plane. It can be a display panel.
In addition, since a plurality of source boards that output drive signals to each display panel are all arranged on the same side of each display panel, the specifications of the source board and FPC can be shared in addition to the specifications of the display panel. And cost merit can be obtained.

Further, since the two display panels have the same drive direction in the row direction and the column direction, the specifications of the source substrate corresponding to each display panel can be made the same, and cost merit can be obtained.
In the above embodiment, the case where each source substrate is arranged on the upper side of the display panel has been described. However, each source substrate can also be arranged on the lower side of the display panel.

It is a disassembled perspective view which shows the liquid crystal module of embodiment in this invention. It is a front view which shows the structure of a panel. It is a figure which shows the assembly | attachment state of a panel. It is a figure which shows the arrangement position of the source substrate in the display apparatus using one display panel. It is a figure which shows the arrangement position of the source substrate in the display apparatus using two display panels.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal module, 10 ... Back cover, 20 ... Back light, 22 ... Board | substrate receiving part, 30 ... Lower panel, 31 ... Driver IC for drive, 32 ... FPC, 40 ... Lower case, 50 ... Diffusing plate, 60 ... Upper Case: 61 ... Frame portion, 62 ... Substrate receiving portion, 70 ... Upper panel, 71 ... Driver IC, 72 ... FPC, 80 ... Front cover, 90A, 90B ... Source substrate, 100 ... Backlight unit, 200 ... Panel unit

Claims (3)

In a display device that displays a three-dimensional stereoscopic image,
A first display panel having pixels capable of displaying a plurality of colors in a pixel region where an image is displayed;
A pixel region is formed in the same pixel array as the first display panel, and is aligned so that pixels corresponding to the first display panel overlap with each other, and is positioned below the first display panel as viewed from the observer. A second display panel arranged in a stack;
The first is located along one side of the display panel is connected to the first display panel, the first drive signal based on the first display signal input via a first connector to be connected to an external signal source And a first control circuit board that outputs the first drive signal to the first display panel;
It is disposed to overlap the front SL below the first control circuit board along one side of the second display panel connected to the second display panel, via a second connector to be connected to the external signal source A second control circuit board that generates a second drive signal based on the second display signal input in response to the second display signal and outputs the second drive signal to the second display panel;
Have
Before Stories second control circuit board, such that at least the second connector does not overlap with the first control circuit board, to said first control circuit board are arranged offset in a plan view, a display device. The first display panel and the second display panel have the same driving direction in the row direction and the column direction ,
The specification of the corresponding part of the first control circuit board to the first display panel and the specification of the corresponding part of the second control circuit board to the second display panel are common.
The display device according to claim 1. The first control circuit board is supported by a first substrate receiving portion provided in a direction perpendicular to the panel surface of the first display panel, and is connected to the first display panel by a wiring member bent substantially at a right angle. And
The second control circuit board is provided in a second position where the second connector arranged in the vertical direction and in the vicinity of the end portion in the vertical direction does not overlap the end portion of the first board receiving portion. Supported by the substrate receiving portion and connected to the second display panel by the wiring member bent at a substantially right angle;
The display device according to claim 1.

Images