JPH09243988A - Display device, video game device, monitor device and information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the space of a display device having two pieces of liquid crystal displays and to reduce the electric power consumption thereof by providing both sides of a back light with the first liquid crystal display and the second liquid crystal display. SOLUTION: This display device is composed of the single back light 130 and the first liquid crystal display 110 and second liquid crystal display 120 disposed to face each other across the light transmission plate 131 of the back light. The back light 130 is composed of the light transmission plate 131, a cathode ray tube 132 disposed on its flank and a reflection sheet 133 which reflects the irradiation light from this cold cathode tube 132. A reflection plate is omitted from the conventional example. The both sides of the single back light 130 are provided with the first liquid crystal display 110 and the second liquid crystal display 120 and, therefore, the smaller installation space is necessitated, the cost is reduced and the space and electric power consumption are reduced as compared to the case where the two liquid crystal displays are installed individually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device capable of viewing a display image from two directions.

[0002]

2. Description of the Related Art A man-machine system that displays scanning procedures and operating states as the performance and functionality of various electronic devices increase.
As an interface, the role of the display device is becoming more and more important.

As such a display device, a CRT display device using a cathode ray tube (CRT) is available.
It has been conventionally used for an information display device for displaying a TV signal or a signal from a computer as an image.

[0004]

In a video game such as an action game or a role playing game, a plurality of people operate the same game to further increase the fun.

Conventionally, a method as shown in FIG. 25 or FIG. 26 has been known as a method for a plurality of people to simultaneously view a game screen using a CRT display device.

FIG. 25 shows a screen division method. In this method, the screen is divided using upper and lower divisions, picture-in-picture and the like.

In FIG. 25, 10 is a CRT display device, A and B are players, and 11 and 12 are split display screens.

However, in the screen division method shown in FIG. 25, since the entire screen of the CRT display device 10 is not used, the resolution and the display size are lowered, and there is a possibility that a plurality of game participants may confuse their screens, which is easy to use. There was a problem.

FIG. 26 shows a system for independently arranging a plurality of devices, which is a system used in game centers and the like.

In FIG. 26, 10 and 20 are CRT display devices, A and B are players, and 11 and 21 are display screens of the respective CRT display devices (10, 20).

In the multiple device independent arrangement system shown in FIG. 26,
There is a drawback that a large space is required to install the CRT display device (10, 20).

As described above by taking a CRT display device used in a video game device as an example, when a plurality of CRT display devices are used by a plurality of people, a large area is required to install the CRT display device. There was a problem that required.

In addition, the CRT display device has drawbacks such as large size, heavy weight, and large power consumption. Therefore, in recent years, liquid crystal using a liquid crystal display panel has been utilized by taking advantage of the features of small size, light weight, and low power consumption. The display device
It is used in various fields.

By using such a liquid crystal display device, for example, in a video game device in which the same game is operated by a plurality of people, the liquid crystal display device can be installed even in the multiple device independent arrangement system shown in FIG. It is possible to reduce the area.

However, no study has been made on the space saving and the power consumption reduction when two such liquid crystal display devices are used.

Further, since such a liquid crystal display device can be viewed from multiple directions, it is required to have a wide viewing angle.

This is because when the viewing angle is narrow, the contrast and gradation of the display image look different for each viewing direction.

Further, it is desirable that the screen is large in view of the visibility of the displayed image.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a display device having two liquid crystal displays,
An object of the present invention is to provide a technology capable of achieving space saving and low power consumption.

Another object of the present invention is to provide a technique capable of achieving a wide viewing angle and a large screen in a display device having two liquid crystal displays.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0022]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) In a display device including a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight. To do.

(2) In a display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight, and the first and second liquid crystal displays are provided. The size of the first liquid crystal display and the size of the second liquid crystal display are different from each other.

(3) In a display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight, and the first and second liquid crystal displays are provided. At least one of the first liquid crystal display and the second liquid crystal display has a liquid crystal display panel for applying an electric field substantially parallel to a substrate surface to a liquid crystal layer injected and sealed between a pair of substrates. And

(4) In a display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight, and the first and second liquid crystal displays are provided. At least one of the first liquid crystal display or the second liquid crystal display has a liquid crystal display panel including a plasma discharge cell.

(5) In a display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight, and the first and second liquid crystal displays are provided. At least one of the first liquid crystal display and the second liquid crystal display has a film having an effect of expanding a viewing angle on a surface of the liquid crystal display on a side far from the backlight.

(6) In a display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight, and the first and second liquid crystal displays are provided. One of the liquid crystal displays, or at least one of the second liquid crystal displays, has a plasma discharge cell, and has a film having an effect of enlarging the viewing angle on the surface of the liquid crystal display far from the backlight. And

(7) In the means of (5) or (6) above, the film having the effect of enlarging the viewing angle has a light diffraction effect.

(8) In the means of (5) or (6), the film having the effect of enlarging the viewing angle has the effect of reducing the viewing angle dependence of the phase difference of the light transmitted through the liquid crystal display. It is characterized by

(9) In the above means (1) to (6), the backlight is a sidelight type backlight having a light guide plate and a light source arranged on a side surface of the light guide plate. Characterize.

(10) In the means (9), the backlight includes two wedge-shaped light guide plates whose oblique sides are overlapped with each other, and two wedge-shaped light guide plates arranged on the side surfaces of each light guide plate. And a light source.

(11) In the above means (10), a single reflector is provided between each of the light guide plates.

(12) In the above means (1) to (6), there is provided a direct type backlight in which a plurality of light sources are arranged on the back side of the first liquid crystal display and the second liquid crystal display. It is characterized by being.

(13) In the means of (12) above, the backlight has a reflector having a plurality of concave and convex portions, and the plurality of light sources are alternately arranged in the concave regions on both sides of the reflector. It is characterized by being.

(14) In the means described in (13), the number of light sources arranged on the first liquid crystal display side and the number of light sources arranged on the second liquid crystal display side with the reflecting plate as a boundary are the same. Is characterized by.

(15) In the means of (13) or (14), a part of the irradiation light can be transmitted through the reflection plate.

(16) In the means described in (13) to (15), the reflection plate has an opening in a part of each of the uneven portions.

According to each of the above means, in the display device, the first liquid crystal display and the second liquid crystal display are provided on both sides of the backlight.
The installation space can be reduced and the space can be saved.

Further, according to the means of (3) and (5) to (8), the viewing angle of the liquid crystal display can be widened, so that the contrast ratio is less lowered and the gradation inversion is less likely to occur. , It is possible for a large number of people to see almost the same display image even when viewed from many directions.

According to the means (4), since it is not necessary to form an active element, the structure can be simplified and a large screen can be easily achieved.

Further, according to the means (10) or (11), when two sidelight type backlights are used as the backlight, the thickness of the sidelight can be reduced, thus saving space. It is possible to plan.

According to the means (13) to (16), when the direct type backlight is used as the backlight, the thickness of the sidelight can be reduced, so that the space can be saved. It will be possible.

[0044]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In all the drawings for explaining the embodiments of the invention, components having the same functions are designated by the same reference numerals, and the repeated description thereof will be omitted.

[First Embodiment of the Invention] FIG. 1 is a sectional view showing a schematic configuration of a display device according to an embodiment (first embodiment of the present invention) of the present invention.

As shown in FIG. 1, the display device 100 according to the embodiment of the present invention includes a single backlight 130.
And the first liquid crystal display 110 provided so as to face each other with the light guide plate 131 of the backlight 130 interposed therebetween.
And a second liquid crystal display 120.

Here, the backlight 130 is the light guide plate 1.
31, cold cathode tube 1 provided on the side surface of the light guide plate 131
32, and a reflection sheet 133 that reflects the irradiation light from the cold cathode fluorescent lamp 131, and also includes the first liquid crystal display 110 and the second liquid crystal display 12.
The 0 and the backlight 130 are fixed by the frame 140.

In the backlight used in the conventional simple matrix type liquid crystal display device or the active matrix type liquid crystal display device, the reflecting plate is provided on one surface of the light guide plate. In the backlight 130 in, the reflector is omitted.

In the backlight used in the conventional simple matrix type liquid crystal display device or active matrix type liquid crystal display device, in addition to the light guide plate, the cold cathode tube and the reflection sheet, a diffusion plate and a prism sheet are used. Although provided, it is omitted in the backlight 130 shown in FIG.

Although only one cold-cathode tube 132 is shown in FIG. 1, two cold-cathode tubes 132 may be provided on opposite surfaces of the light guide plate 131.

As described above, according to the display device 100 of the first embodiment of the present invention, the single backlight 13 is used.
On both sides of the first liquid crystal display 110 and the second liquid crystal display 110.
Since the liquid crystal display 120 of 2 is provided,
Compared with the case where individual liquid crystal displays are individually installed, the installation space is small, the cost is low, and the space can be saved and the power consumption can be reduced.

In this case, the first liquid crystal display 11
The same image or different images can be displayed on the 0 and second liquid crystal displays 120.

Further, the first liquid crystal display 110
The second liquid crystal display 120 is provided in the liquid crystal display panel of the conventional simple matrix type liquid crystal display device or the active matrix type liquid crystal display device, and in the peripheral portion of the liquid crystal display panel, and drives the liquid crystal display panel. Drive circuits (for example, common driver, segment driver, gate driver, drain driver, control circuit, power supply circuit, etc.) for

Hereinafter, the first liquid crystal display 110 will be described.
Or used for the second liquid crystal display 120,
As a liquid crystal display panel of an active matrix liquid crystal display device, an example of a liquid crystal display panel of a horizontal electric field type active matrix liquid crystal display device will be described.

FIG. 2 is a plan view showing one pixel and its periphery of a liquid crystal display panel in a horizontal electric field type active matrix type liquid crystal display device.

In the figure, the solid line shows the structure formed on the lower transparent glass substrate (SUB1) side which is the lower substrate, and the broken line shows the upper transparent substrate glass (SUB 1) which is the upper substrate.
The structure formed on the 2) side is shown.

As shown in FIG. 2, each pixel has two adjacent scanning signal lines (gate signal lines or horizontal signal lines) (G
L) and an adjacent two video signal lines (drain signal lines or vertical signal lines) (DL) are arranged in an intersecting region (in a region surrounded by four signal lines).

Each pixel has a thin film transistor (TFT),
Storage capacitor (Cstg), pixel electrode (PX), counter electrode (CT) and counter voltage signal line (common signal line) (C
L).

Here, the scanning signal lines (GL) and the counter voltage signal lines (CL) extend in the left-right direction in FIG. 1, and a plurality of them are arranged in the up-down direction, and the video signal lines (DL) move up and down. And extends in the left-right direction.

The pixel electrode (PX) is connected to the source electrode (SD1) of the thin film transistor (TFT), and the counter electrode (CT) is formed integrally with the counter voltage signal line (CL).

The pixel electrode (PX) and the counter electrode (CT) face each other, and each pixel electrode (PX) and the counter electrode (CT).
The optical state of the liquid crystal layer (LC) is controlled by the electric field between and to control the display.

The pixel electrode (PX) and the counter electrode (CT) are formed in a comb-teeth shape, and each is a vertically long electrode in FIG.

In the liquid crystal display panel shown in FIG. 2, the pixel electrode (PX) has a U-shape that opens downward, and the counter electrode (CT) has a comb-teeth shape that projects downward from the counter voltage signal line (CL). Therefore, the area between the pixel electrode (PX) and the counter electrode (CT) is divided into four in one pixel.

FIG. 3 is a sectional view showing a section taken along a section line 3-3 shown in FIG. 2. FIG. 4 is a sectional view showing a section of a thin film transistor (TFT) taken along a section line 4-4 shown in FIG. FIG. 4 is a cross-sectional view showing a cross section of the storage capacitor (Cstg) along the 5-5 cutting line shown in FIG. 2.

As shown in FIGS. 3 to 5, a liquid crystal layer (LC)
On the lower transparent glass substrate (SUB1) side,
A thin film transistor (TFT), a storage capacitor (Cstg) and an electrode group are provided, and an upper transparent glass substrate (SUB) is provided.
On the 2) side, a color filter (FIL) and a light shielding film (black matrix pattern; BM) are provided.

Further, transparent glass substrates (SUB1, SUB)
On the surface of each inner side (liquid crystal layer (LC) side) of 2), an alignment film (ORI1, OR) for controlling the initial alignment of the liquid crystal is formed.
I2) is provided, and a transparent glass substrate (SUB1,
Polarizing plates (POL1, POL2) are provided on the outer surface of each SUB2).

As shown in FIG. 4, the thin film transistor (TFT) has a gate electrode (GT) and a gate insulating film (G).
I), i-type (intrinsic, intrinsic, i-type semiconductor layer (AS) made of amorphous silicon (Si) not doped with conductivity determining impurities), a pair of source electrodes (SD)
1), having a drain electrode (SD2).

As the thin film transistor (TFT), in addition to an amorphous silicon thin film transistor element, a polysilicon thin film transistor element, a MOS type transistor on a silicon wafer, an organic TFT, or an MIM (Metal-Insulator-Me) is used.
It is also possible to use a two-terminal element such as a tal) diode.

The gate electrode (GT) is connected to the scanning signal line (G
L), and a part of the scanning signal line (GL) serves as a gate electrode (GT).

Here, the scanning signal line (GL), the gate electrode (GT), the counter electrode (CT) and the counter voltage signal line (C).
L) is, for example, an aluminum (Al) -based conductive film (g
1), the scanning signal line (GL), the gate electrode (G)
T), counter electrode (CT) and counter voltage signal line (CL)
Are formed in the same layer in the same manufacturing process.

Scan signal line (GL), gate electrode (G
T), counter electrode (CT) and counter voltage signal line (CL)
An insulating film (GI) made of, for example, a silicon nitride film formed by plasma CVD is provided on the above.

The insulating film (GI) is a thin film transistor (T
In the FT, as a gate insulating film for applying an electric field to the semiconductor layer (AS) together with the gate electrode (GT), or the scanning signal line (GL) and the counter voltage signal line (C).
It is used for electrical insulation between L) and the video signal line (DL).

On the i-type semiconductor layer (AS) in the connection region with the source electrode (SD1) and the drain electrode (SD2), phosphorus (P) -doped N (+) type amorphous silicon for ohmic contact is formed. A semiconductor layer is provided.

Each of the source electrode (SD1) and the drain electrode (SD2) has a conductive film (d1) in contact with the N (+) type amorphous silicon semiconductor layer and a conductive film (d2) formed thereon. ) And is composed of.

The conductive film (d1) is, for example, a chromium (Cr) film formed by sputtering, and the conductive film (d2) is an aluminum (Al) -based conductive film.

The video signal line (DL) and the pixel electrode (P
X) is a source electrode (SD1) and a drain electrode (S
D2) and the conductive film (d1) formed in the same layer as the source electrode (SD1) and the drain electrode (SD2),
It is composed of a conductive film (d2) formed thereon.

The pixel electrode (PX) has an end opposite to the end connected to the thin film transistor (TFT).
It is configured to overlap the counter voltage signal line (CL).

In this superposition, as is clear from FIG. 5, the pixel electrode (PX) is one electrode (PL2),
A storage capacitor (electrostatic capacitance element) (Cstg) having the opposite voltage signal (CL) as the other electrode (PL1) is configured.

The dielectric film of this storage capacitor (Cstg) is
It is composed of an insulating film (GI) used as a gate insulating film of a thin film transistor (TFT) and an anodized film.

The storage capacitor (Cstg) is provided to store the video information written in the pixel (after the thin film transistor (TFT) is turned off) for a long time.

A protective film (PSV) made of, for example, a silicon oxide film or a silicon nitride film formed by a plasma CVD apparatus is provided on the thin film transistor (TFT).

The protective film (PSV) is provided mainly for protecting the thin film transistor (TFT) from moisture and the like, and a film having high transparency and good moisture resistance is used.

On the upper transparent glass substrate (SUB2) side,
The light-shielding film (BM) prevents the transmitted light from an unnecessary gap (a gap other than between the pixel electrode (PX) and the counter electrode (CT)) from being emitted to the display surface side and lowering the contrast ratio and the like.
(A so-called black matrix pattern) is formed.

The light-shielding film (BM) also plays a role of preventing external light or backlight light from entering the i-type semiconductor layer (AS), and the light-shielding film (BM) shown in FIG. 2 has a closed polygonal shape. The contour line indicates the opening in which the light shielding film (BM) is not formed.

The light-shielding film (BM) is formed in a lattice shape around each pixel, and the effective display area of one pixel is partitioned by this lattice. Therefore, the outline of each pixel is the light-shielding film (BM).
To clarify.

That is, the light shielding film (BM) has two functions of a black matrix and a light shielding for the i-type semiconductor layer (AS).

The light-shielding film (BM) is formed of a film having a light-shielding property and a high insulating property so as not to affect the electric field between the pixel electrode (PX) and the counter electrode (CT). In the liquid crystal display panel shown in FIG. 2, the light shielding film (BM) is made of an insulating organic resin (resist material) in which a black pigment is dispersed.

A color filter (FIL) is provided in the opening of the light shielding film (BM).
L) is formed in a stripe shape by repeating red, green, and blue at a position facing the pixel, and also has a color filter (FI).
L) is configured to overlap the edge portion of the light shielding film (BM).

The color filter (FIL) can be formed as follows.

First, a dyeing base material such as acrylic resin is formed on the surface of the upper transparent glass substrate (SUB2), and the dyeing base material other than the red filter forming region is removed by photolithography technique.

After that, the dyed substrate is dyed with a red dye, and a fixing process is performed to form a red filter (R).

Next, by performing the same steps,
A green filter (G) and a blue filter (B) are sequentially formed.

Light-shielding film (BM) and color filter (F
IL), an overcoat film (OC) made of a transparent resin material such as acrylic resin or epoxy resin.
The overcoat film (OC) prevents the dye from leaking from the color filter (FIL) to the liquid crystal layer (LC), and prevents a step due to the color filter (FIL) and the light shielding film (BM). It is provided for flattening.

Upper and lower transparent glass substrates (SUB1, SUB)
A liquid crystal filling port (not shown) is provided along the edge between 2).
Except for the above, a seal pattern (not shown) is provided so as to seal the liquid crystal layer (LC).

On the protective film (PSV) on the lower transparent glass substrate (SUB1) side, and on the upper transparent glass substrate (SUB
On the 2) side overcoat film (OC), alignment films (ORI1, ORI2) made of polyimide are provided, and the alignment films (ORI1, ORI2) are formed inside the seal pattern.

The liquid crystal layer (LC) is composed of a lower alignment film (ORI1) and an upper alignment film (ORI2) for setting the orientation of liquid crystal molecules.
It is enclosed in a region partitioned by a seal pattern between and.

In the liquid crystal display panel shown in FIG. 2, the lower transparent glass substrate (SUB1) and the upper transparent glass substrate (SUB) are used.
After 2) is formed by stacking various layers separately, a seal pattern is formed on the upper transparent glass substrate (SUB2) side, the lower transparent glass substrate (SUB1) and the upper transparent glass substrate (SUB2) are superposed, Liquid crystal (LC) is injected from the opening of the seal pattern, the injection port is sealed with epoxy resin, and the upper and lower substrates are cut to assemble.

FIG. 6 is a diagram showing a connection diagram of an equivalent circuit of the display matrix section (AR) and its peripheral circuits in the liquid crystal display panel shown in FIG.

Although FIG. 6 is a circuit diagram, it is drawn corresponding to the actual geometrical arrangement.

In FIG. 6, AR indicates a display matrix section (matrix array) in which a plurality of pixels are two-dimensionally arranged, and Pix indicates a liquid crystal capacitance of the liquid crystal layer (LC).

Further, PX represents a pixel electrode, and the subscripts R and G
And B are added corresponding to red, green and blue pixels respectively.

The drain electrodes of a plurality of thin film transistors (TFTs) in each column direction among the thin film transistors (TFTs) arranged in a matrix are connected to the same video signal line (drain signal line) (DL), and the plurality of the plurality of thin film transistors (TFTs) are connected to each other. The video signal line (DL) is connected to a video signal drive circuit (drain driver) (H) at the upper part of the liquid crystal display panel.

In addition, the gate electrodes of a plurality of thin film transistors (TFTs) in each row direction among the thin film transistors (TFTs) arranged in a matrix are connected to the same scanning signal line (gate signal line) (GL), The plurality of scanning signal lines (GL) are connected to the vertical scanning circuit (gate driver) (V) on one side surface of the liquid crystal display panel.

Further, a common electrode (opposing electrode) for applying an electric field to the liquid crystal layer (LC) in the direction parallel to the substrate is provided for each of the plurality of pixel electrodes (PX) arranged in the matrix, and the matrix is provided. The plurality of counter electrodes facing the plurality of pixel electrodes (PX) in each row direction in the pixels arranged in a line are connected to the same counter voltage signal line (common electrode signal line) (CL).

This counter voltage signal line (common electrode signal line)
(CL) are collected by a common bus line on the other side surface of the liquid crystal display panel and led out to the counter electrode terminal (CTM). The counter electrode terminal (CTM) has a circuit (SU).
The counter voltage (Vcom) from P) is applied.

The vertical scanning circuit (V) and the video signal driving circuit (H) are supplied with the scanning signal (scanning voltage) and the video signal (gradation voltage) from the liquid crystal driving power supply circuit of the circuit (SUP), and The counter voltage (Vcom) applied to the counter voltage signal line (CL) is also supplied from the liquid crystal drive power supply circuit of the circuit (SUP).

The circuit (SUP) converts the image information (display data, control signal) from the host into the image information (display data, control signal) for the liquid crystal display panel, and displays for the liquid crystal display panel. Output data to the video signal drive circuit (H) and control signals for the liquid crystal display panel to the vertical scanning circuit (V) and the video signal drive circuit (H).

In the liquid crystal display panel shown in FIG. 6, based on a control signal input from the information processing device to the circuit (SUP), the vertical drive circuit (V) sequentially outputs the scan signal to the plurality of scan signal lines (GL). (Scanning voltage) is applied to turn on and off a plurality of thin film transistors (TFTs) connected to the scanning signal line (GL), and the video signal from the video signal drive circuit (H) is synchronized with the timing. Line (D
A video signal (grayscale voltage) is applied to L) and a grayscale voltage is applied to the pixel electrode (PX).

Here, y0 and y of the scanning signal line (GL)
1, ... Yend indicate the order of the scanning timing.

In the liquid crystal display panel shown in FIG. 2, the upper alignment film (ORI2) on the upper transparent glass substrate (SUB2) side.
And the lower alignment film (ORI1) on the lower transparent glass substrate (SUB1) side are subjected to a rubbing treatment to control the initial alignment direction (φLC) of the liquid crystal molecules.

FIG. 7 shows an applied electric field direction (EDR), a rubbing direction (RDR), and a liquid crystal display panel shown in FIG.
It is a figure which shows the relationship of a polarization transmission axis (MAX1, MAX2).

The angle between the rubbing direction (RDR) and the applied electric field direction (EDR) is determined by the dielectric anisotropy Δ of the liquid crystal material.
If ε is positive, 45 ° C or more and less than 90 ° C, or 90 °
Is more than 135 ° and the dielectric anisotropy Δε is negative,
Since the liquid crystal molecules rotate in the direction perpendicular to the electric field direction,
It must be more than 45 ° and less than 45 ° or 145 ° C and less than 180 ° C.

As shown in FIG. 7, as the polarizing plate (POL), the polarization transmission axis (MAX) of the lower polarizing plate (POL1) is used.
The angle (φP) between 1) and the direction of the applied electric field (EDR) is
The angle is equal to the angle (φLC), and the polarization transmission axis (MAX2) of the upper deflection plate (POL2) is set to be orthogonal to it.

Then, as shown in FIG. 2, by applying a voltage between the counter electrode (CT) and the pixel electrode (PX) formed on the lower transparent glass substrate (SUB1),
The upper and lower transparent glass substrates (SUB1, S) are formed on the liquid crystal layer (LC).
An electric field (E) parallel to UB2) is generated, which causes
The light transmitted through the liquid crystal layer (LC) is modulated to display an image on the liquid crystal display panel.

By using the horizontal electric field type active matrix type liquid crystal display device, a wide viewing angle can be realized in addition to the effect of space saving and power consumption reduction.

Further, the first liquid crystal display 110
Alternatively, the second liquid crystal display 120 can be a plasma addressed liquid crystal panel using plasma discharge cells for switching liquid crystal pixels.

Hereinafter, the first liquid crystal display 110 will be described.
Alternatively, an example of the plasma addressed liquid crystal panel used for the second liquid crystal display 120 will be described.

FIG. 8 is an exploded perspective view showing a schematic structure of an example of the plasma addressed liquid crystal panel, and FIG.
FIG. 9 is a sectional view showing a sectional structure of a main part of the plasma addressed liquid crystal panel shown in FIG. 8.

As shown in FIGS. 8 and 9, the plasma addressed liquid crystal panel 200 includes a color filter substrate 220,
An insulating film 240, a plasma substrate 250, a liquid crystal layer 230 injected and sealed between the color filter substrate 220 and the insulating film 240, a polarizing plate (2) provided outside the color filter substrate 220 and the plasma substrate 250.
10, 260).

The color filter substrate 220 comprises a plurality of transparent electrodes 222 provided in a column direction on a transparent substrate 221.
And a color filter 223 provided on the transparent electrode 222 so as to correspond to each transparent electrode 222.

The plasma substrate 250 is the transparent substrate 2
The transparent substrate 2 is formed by a plurality of partition walls 255 provided on the substrate 51.
Plasma discharge cell 254 provided in the row direction on 51
And a cathode electrode 252 and an anode electrode 253 provided in the plasma discharge cell 254.

Here, the intersections of the plurality of transparent electrodes 222 and the discharge cells 254 form one pixel.

When plasma 270 is generated in the plasma discharge cell 254, the anode 253 and the insulating film 240 above the plasma discharge cell 254 are brought into conduction, and the insulating film 240 has a virtual potential of negative potential. Electrode 241 is generated.

At this time, an electric field can be generated in the liquid crystal layer 230 by applying a voltage to the transparent electrode 222.

Therefore, when plasma is generated in one discharge cell 254 among the plurality of discharge cells 254, one scanning line of the plasma addressed liquid crystal panel 200 is turned on, and in this state, the display data is dealt with. By applying the generated voltage to the transparent electrode 222, the liquid crystal layer 2
The light transmitted through 30 can be modulated to display an image for one scanning line on the plasma addressed liquid crystal panel 200.

Since the plasma addressed liquid crystal display panel does not have an active matrix element, the structure can be simplified. Therefore, in addition to the effect of space saving and power consumption reduction, a large screen can be easily realized. It is possible.

In addition, widening the viewing angle requires the first liquid crystal display 110 or the second liquid crystal display 1.
It can also be realized by providing a film having an effect of enlarging the viewing angle on the surface of 20 which is far from the backlight 130.

In this case, the viewing angle of the liquid crystal display provided with the film can be expanded, and this effect can be obtained also in the plasma addressed liquid crystal panel.

As the film for enlarging the viewing angle, a film having a light diffraction effect and a film having an effect of reducing the viewing angle dependence of the phase difference of light transmitted through the liquid crystal display are suitable.

[Embodiment 2] FIG. 10 is a sectional view showing a schematic structure of a display device 100 according to another embodiment of the present invention (Embodiment 2 of the invention).

As shown in FIG. 10, the display device 100 according to the second embodiment of the present invention is different from the first embodiment in that the first liquid crystal display 110 and the second liquid crystal display 120 have different display sizes. This is different from the display device 100 of the first embodiment.

Also in the display device 100 according to the second embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Third Embodiment of the Invention] FIG. 11 is a sectional view showing a schematic structure of a display device 100 according to another embodiment (third embodiment of the invention) of the present invention.

In the display device 100 according to the third embodiment of the present invention, the backlight 130 comprises a first backlight 130a and a second backlight 130b,
The first backlight 130a illuminates the first liquid crystal display 110, and the second backlight 13
This is different from the display device 100 according to the first embodiment of the invention in that the second liquid crystal display 120 is illuminated at 0b.

FIG. 12 shows the backlight 13 shown in FIG.
It is sectional drawing which shows the more detailed structure of 0a and the backlight 130b.

As shown in FIG. 12, the first backlight 130a and the second backlight 130b respectively include a light guide plate (131a, 131b) and the light guide plate (13).
1a, 131b) liquid crystal display (110, 12
0) and the reflection plate (134a, 13) provided on the surface opposite to
4b), cold cathode tubes (132a, 132b) provided on the side surfaces of the light guide plates (131a, 131b), and a reflection sheet (133a, 133b) that reflects irradiation light from the cold cathode tubes (132a, 132b). ).

Here, the light guide plates (131a, 131)
b) is a wedge-shaped light guide plate, and in the embodiment of the present invention, the wedge-shaped oblique sides of the light guide plates (131a, 131b) are overlapped to reduce the thickness of the backlight 130, We are trying to save space.

The backlight used in the conventional simple matrix type liquid crystal display device or active matrix type liquid crystal display device includes a diffuser plate and a prism sheet in addition to the light guide plate, the cold cathode tubes and the reflection sheet. Although provided, it is omitted in the backlight 130 shown in FIGS. 11 and 12.

In the display device 100 according to the first embodiment (or the second embodiment of the invention), since the light guide plate 131 has a rectangular cross section in a direction perpendicular to the cold cathode tubes 132, the cold cathode tubes 132 are provided. There is a drawback in that the utilization efficiency of the irradiation light from is low, and uneven brightness occurs in the first liquid crystal display 110 and the second liquid crystal display 120.

However, in the display device 100 according to the third embodiment of the present invention, each cold cathode tube (132a, 1a).
The irradiation light from 32b) is reflected by the reflection plates (134a, 134a).
Since it is reflected by b) and is incident on the first liquid crystal display 110 and the second liquid crystal display 120, it is possible to improve the utilization efficiency of the irradiation light, and further, the first liquid crystal display 110 and the second liquid crystal display 110 are used. LCD display 1
It is possible to reduce the luminance unevenness of 20.

[Fourth Embodiment of the Invention] FIG. 13 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the present invention (fourth embodiment of the invention).

In the display device 100 according to the fourth embodiment of the present invention, the reflecting plate provided between the light guide plates (131a, 131b) is constituted by a single reflecting plate 134, and thus the embodiment of the present invention is performed. Display device 100 in the form 3
Is different from

Also in the display device 100 according to the fourth embodiment of the present invention, it is possible to improve the utilization efficiency of irradiation light while saving space, and further, the first liquid crystal display 110 and the second liquid crystal. It is possible to reduce the uneven brightness of the display 120.

[Fifth Embodiment of the Invention] FIG. 14 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the invention (the fifth embodiment of the invention).

The display device 100 according to the fifth embodiment of the present invention is the first backlight shown in FIG.
This is different from the display device 100 according to the first embodiment of the invention in that a direct type backlight in which a plurality of light sources are arranged is used on the back side of the liquid crystal display 110 and the second liquid crystal display 120.

In FIG. 14, the backlight 13
Diffusion plates may be arranged on both sides of 0.

Also in the display device 100 according to the fifth embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Sixth Embodiment of the Invention] FIG. 15 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the present invention (sixth embodiment of the invention).

The display device 100 according to the sixth embodiment of the present invention has a zigzag pattern-shaped reflection plate 13 having a plurality of concave and convex portions 135 in a direct type backlight 130.
4 is provided, and a plurality of cold cathode tubes 132 are alternately arranged in the recessed regions on both surfaces of the reflection plate 134, which is different from the display device 100 according to the fifth embodiment of the invention.

In display device 100 according to the sixth embodiment of the present invention, it is possible to reduce the thickness of backlight 130 as compared with the case where a linear reflector is provided, and it is possible to save space. .

The irradiation light from each cold cathode tube 132 is
The first liquid crystal display 1 is reflected by the reflecting plate 134.
10 and the second liquid crystal display 120, it is possible to improve the utilization efficiency of the irradiation light,
Furthermore, it is possible to reduce the uneven brightness of the first liquid crystal display 110 and the second liquid crystal display 120.

The shape of the concave and convex portion 135 of the reflecting plate 134 may be a curved shape as shown in FIG.

Further, by using a white synthetic resin plate as the reflection plate 134, a part of the irradiation light incident on the reflection plate 134 is transmitted through the reflection plate 134 and then the reflection plate 134.
Since it leaks to the back side of the first liquid crystal display 110
Moreover, it is possible to further reduce the uneven brightness of the second liquid crystal display 120.

Also in the display device 100 according to the fifth embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Seventh Embodiment of the Invention] FIG. 17 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the present invention (seventh embodiment of the invention).

The display device 100 according to the seventh embodiment of the present invention includes the cold cathode fluorescent lamp 1 in the direct type backlight 130.
This is different from the display device 100 according to the sixth embodiment of the present invention in that the same number of 32 are arranged on the first liquid crystal display 110 side or the second liquid crystal display 120 side with the reflection plate 134 as a boundary. .

According to the display device 100 of the seventh embodiment of the present invention, the first liquid crystal display 110 and the second liquid crystal display 110 are provided.
Since the distribution of the irradiation light incident on the liquid crystal display 120 and the liquid crystal display 120 is uniform, it is possible to uniform the brightness of the first liquid crystal display 110 and the second liquid crystal display 120, and the first liquid crystal Display 1
10 and the second liquid crystal display 120 can be reduced in luminance unevenness.

Also in the display device 100 of the seventh embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Embodiment 8] FIG. 18 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the present invention (Embodiment 8).

The display device 100 according to the eighth embodiment of the present invention is characterized in that the cold cathode fluorescent lamps 132 at both ends of the direct type backlight 130 are arranged close to the upper and lower parts of the backlight 130. This is different from the display device 100 of the seventh embodiment.

In the display device 100 according to the seventh embodiment of the invention, since the cold cathode fluorescent lamps 132 at both ends in the backlight 130 are separated from the upper and lower portions of the backlight 130, the first liquid crystal display 110 and the second liquid crystal display 110 Of the upper and lower parts of the liquid crystal display 120
There is a drawback that uneven brightness occurs in the upper and lower portions of the first liquid crystal display 110 and the second liquid crystal display 120.

However, in the display device 100 according to the eighth embodiment of the present invention, since the cold cathode fluorescent lamps 132 at both ends of the backlight 130 are arranged close to the upper and lower portions of the backlight 130, the first liquid crystal is formed. The distribution of the irradiation light incident on the display 110 and the second liquid crystal display 120 is made substantially uniform over the entire surfaces of the first liquid crystal display 110 and the second liquid crystal display 120. It is possible to reduce uneven brightness in the upper and lower parts of the second liquid crystal display 120.

Also in the display device 100 according to the eighth embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Ninth Embodiment of the Invention] FIG. 19 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment of the invention (the ninth embodiment of the invention).

FIG. 20 is a plan view showing a schematic structure of the reflection plate 134 shown in FIG.

As shown in FIG. 20, the display device 100 according to the ninth embodiment of the present invention is characterized in that the reflection plate 134 in the direct type backlight 132 has an opening 136 in a part of the uneven portion 135. This is different from the display device 100 according to the fifth embodiment of the invention.

According to the display device 100 of the ninth embodiment of the present invention, a part of the irradiation light from each cold cathode fluorescent lamp 132 passes through the opening 136 of the reflection plate 134 and the liquid crystal display on the opposite side (first side). Incident on the first liquid crystal display 110 or the second liquid crystal display 120), the distribution of the irradiation light incident on the first liquid crystal display 110 and the second liquid crystal display 120 becomes more uniform,
It is possible to make the brightness of the first liquid crystal display 110 and the second liquid crystal display 120 uniform,
In addition, it is possible to further reduce the uneven brightness of the first liquid crystal display 110 and the second liquid crystal display 120.

Also in the display device 100 according to the ninth embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Embodiment 10] FIG. 21 is a sectional view showing a schematic structure of a backlight of a display device according to another embodiment (Embodiment 10) of the present invention.

The display device 100 according to the tenth embodiment of the present invention is the reflection plate 1 in the direct type backlight 130.
The display device 10 according to the seventh embodiment of the present invention is characterized in that 34 has an opening 136 in a part of the uneven portion 135.
Different from 0.

Also in the display device 100 of the tenth embodiment of the present invention, it is possible to make the brightness of the first liquid crystal display 110 and the second liquid crystal display 120 uniform, and the first liquid crystal display 1
It is possible to further reduce the luminance unevenness of the 10 and second liquid crystal display 120.

Also in the display device 100 according to the tenth embodiment of the present invention, the installation space is smaller than the case where two liquid crystal displays are individually installed, the cost is low, and the space is saved. It is possible to reduce power consumption.

[Eleventh Embodiment of the Invention] FIG. 22 is a perspective view showing a schematic configuration of a monitor device according to another embodiment of the present invention (Embodiment 11).

The eleventh embodiment of the present invention is an embodiment of the invention in the case where the display device 100 of each of the above-described embodiments of the invention is applied to a monitor device.

Monitor apparatus 30 of Embodiment 11 of the present invention
By using 0, the installation place can be reduced as compared with the conventional CRT display device, so that the space can be saved.

Further, since it is possible to monitor the display image from both sides of the monitor device 300, for example, by using it as a guide display plate of a public facility where many people gather, a light guide display plate can be obtained. It becomes possible to configure.

In this case, the first liquid crystal display 11
Many people can monitor from a wide angle by using a liquid crystal display panel of a horizontal electric field type active matrix liquid crystal display device having a wide viewing angle for the 0 and second liquid crystal displays 120. Is.

[Embodiment 12] FIG. 23 is a block diagram showing a schematic structure of a video game apparatus according to another embodiment (Embodiment 12) of the present invention.

The eleventh embodiment of the present invention is an embodiment of the invention in which the display device 100 of each of the above-described embodiments of the present invention is applied to a display device of a video game device.

In FIG. 23, 400 is a video game device, 401 is a game controller, 402 is a remote controller for player A, 403 is a remote controller for player B, and 40 is a remote controller.
4 is a common program.

In the video game device 400 according to the eleventh embodiment of the present invention, the game controller 401 includes a player A remote controller 402 and a player B remote controller 4.
Common game program 4 based on instructions from 03
By executing 04, the player A and the player B execute the game by seeing their own game screens displayed on the first display device 110 and the second display device 120.

By using video game device 400 in accordance with the eleventh embodiment of the present invention, the number of installation places is smaller than that of the conventional CRT display device, so that space can be saved.

In this case, the first liquid crystal display 11
By using the liquid crystal display panel of the horizontal electric field type active matrix liquid crystal display device having a wide viewing angle for the zero and second liquid crystal displays 120, it is possible to participate in a group as player A or player B. It is possible to further increase the fun of the game.

[Thirteenth Embodiment of the Invention] FIG. 24 is a sectional view showing a schematic structure of a portable personal computer according to another embodiment of the present invention (Embodiment 12).

The twelfth embodiment of the present invention is an embodiment of the invention in which the display device 100 of each of the above-described embodiments of the present invention is applied to the display unit of a portable personal computer which is one of the information processing devices. Is.

In FIG. 24, reference numeral 500 is a portable personal computer, 501 is a main body, and 502 is a display section. FIG. 24A shows a state in which the display section 502 is closed, and FIG. The state where the display unit 502 is opened is shown.

Here, the display unit 502 includes a first liquid crystal display 110 and a second liquid crystal display 120.
And a backlight 130.

By using the portable personal computer 500 according to the twelfth embodiment of the present invention, the conventional C
Since the installation place is smaller than that of the RT display device, it is possible to save space.

In addition, the portable personal computer 50
Since the image displayed by operating 0 can be viewed simultaneously by the customer and the person operating it, the efficiency of the window work can be improved by using it in the window service, for example.

Although the present invention has been specifically described based on the embodiments of the present invention, the present invention is not limited to the embodiments of the present invention, and various modifications can be made without departing from the scope of the invention. Not to mention getting it.

[0192]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1) According to the present invention, it is possible to save space in a display device using two liquid crystal displays.

(2) According to the present invention, it is possible to reduce power consumption in a display device using two liquid crystal displays.

(3) According to the present invention, the cost can be reduced in a display device using two liquid crystal displays.

(4) According to the present invention, in a display device using two liquid crystal displays, the brightness of each liquid crystal display can be made uniform.

(5) According to the present invention, in a display device using two liquid crystal displays, it is possible to reduce the brightness unevenness of each liquid crystal display.

(6) By applying the display device of the present invention to a monitor device, it is possible to save space in the monitor device and to monitor a display image from both sides.

Further, by using a liquid crystal display panel of a horizontal electric field type active matrix type liquid crystal display device having a wide viewing angle as a display device, a large number of people can monitor at the same time.

(7) By applying the display device of the present invention to the display device of a video game device,
It is possible to save the space of the display device in the video game device and to view the game screen from both sides.

By using a liquid crystal display panel of a horizontal electric field type active matrix type liquid crystal display device having a wide viewing angle as a display device, groups can participate in the game, and the game It is possible to increase the fun.

(8) By applying the display device of the present invention to the display section of the information processing device, space can be saved and the display screen can be viewed from both sides.

As a result, for example, it is possible to improve the efficiency of the window service.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a display device according to an embodiment (Embodiment 1 of the invention) of the present invention.

FIG. 2 is a plan view showing one pixel and its periphery of a liquid crystal display panel in a horizontal electric field type active matrix liquid crystal display device.

3 is a cross-sectional view showing a cross section taken along a line 3-3 in FIG.

4 is a cross-sectional view showing a cross section of a thin film transistor (TFT) taken along section line 4-4 shown in FIG.

5 is a diagram showing a storage capacitance (C
It is sectional drawing which shows the cross section of stg).

6 is a diagram showing a connection diagram of an equivalent circuit of a display matrix portion (AR) and its peripheral circuit in the liquid crystal display panel shown in FIG.

7 is a diagram showing a relationship among an applied electric field direction (EDR), a rubbing direction (RDR), and polarization transmission axes (MAX1, MAX2) in the liquid crystal display panel shown in FIG.

FIG. 8 is an exploded perspective view showing a schematic configuration of an example of a plasma addressed liquid crystal panel.

9 is a sectional view showing a sectional structure of a main part of the plasma addressed liquid crystal panel shown in FIG.

FIG. 10 is a sectional view showing a schematic configuration of a display device 100 according to another embodiment of the present invention (Embodiment 2 of the invention).

FIG. 11 is a sectional view showing a schematic configuration of a display device 100 according to another embodiment of the present invention (Embodiment 3 of the invention).

12 is a cross-sectional view showing a more detailed configuration of the backlight 130a and the backlight 130b shown in FIG.

FIG. 13 is a cross-sectional view showing a schematic configuration of a backlight of a display device which is another embodiment of the present invention (Embodiment 4 of the invention).

FIG. 14 is a sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 5 of the invention).

FIG. 15 is a sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 6 of the invention).

16 is a diagram showing another example of the reflection plate 134 shown in FIG.

FIG. 17 is a sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 7 of the invention).

FIG. 18 is a sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 8 of the invention).

FIG. 19 is a sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 9 of the invention).

20 is a plan view showing a schematic configuration of a reflection plate 134 shown in FIG.

FIG. 21 is a cross-sectional view showing a schematic configuration of a backlight of a display device according to another embodiment of the present invention (Embodiment 10 of the present invention).

FIG. 22 is a perspective view showing a schematic configuration of a monitor device according to another embodiment of the present invention (Embodiment 11 of the invention).

FIG. 23 is a block diagram showing a schematic configuration of a video game device which is another embodiment of the present invention (Embodiment 12 of the invention).

FIG. 24 is a cross-sectional view showing a schematic configuration of a portable personal computer according to another embodiment of the present invention (Embodiment 12 of the invention).

FIG. 25: Using a conventional CRT display device,
It is a figure for explaining a method in which a plurality of people look at a game screen at the same time, and is a figure showing a screen division system.

FIG. 26: Using a conventional CRT display device,
It is a figure for explaining a method in which a plurality of people look at a game screen at the same time, and is a figure showing a multiple device independent arrangement system.

[Explanation of symbols]

10, 20 ... CRT display device, 11, 12, 2
1 ... Display screen, 100 ... Display device, 110, 1
20 ... Liquid crystal display, 130, 130a, 130b
... Backlight, 131, 131a, 131b ... Light guide plate, 132, 132a, 132b ... Cold cathode tube, 133
133a, 133b ... Reflective sheets, 134, 134a,
134b ... Reflector plate, 135 ... Concavo-convex part, 136 ... Opening part,
140 ... Frame, 200 ... Plasma addressed liquid crystal panel, 210, 260 ... Polarizing plate, 220 ... Color filter substrate, 221, 251 ... Transparent substrate, 222 ... Transparent electrode, 223 ... Color filter, 230 ... Liquid crystal layer, 240
... Insulating film, 241 ... Virtual electrode, 250 ... Plasma substrate,
252 ... Cathode electrode, 253 ... Anode electrode, 254
... Plasma discharge cell, 255 ... Partition wall, 270 ... Plasma, 300 ... Monitor device, 400 ... Video game device,
401 ... Game controller, 402 ... Player A remote controller, 403 ... Player B remote controller, 404 ...
Common program, 500 ... Portable personal computer, 501 ... Main body section, 502 ... Display section, SUB ... Transparent glass substrate, GL ... Scan signal line, DL ... Video signal line, CL
... counter voltage signal line, PX ... pixel electrode, CT ... counter electrode,
GI ... Insulating film, GT ... Gate electrode, AS ... i-type semiconductor layer, SD ... Source electrode or drain electrode, POL ... Polarizing plate, ORI ... Alignment film, OC ... Overcoat film, PS
V ... Protective film, BM ... Light-shielding film, FIL ... Color filter,
LC ... Liquid crystal layer, TFT ... Thin film transistor, Cstg ...
Storage capacity.

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[Procedure amendment]

[Submission date] July 8, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction contents]

[0002]

The performance of the Related Art Various electronic devices, along with the performance, as a man-machine interface that displays the procedure and the operating status of the scan, the role of the display device is becoming more and more important .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 5/66 102 H04N 5/66 102A

Claims (19)

[Claims] 1. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, wherein a first liquid crystal display and a second liquid crystal display are provided on both sides of the backlight. Display device. 2. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, wherein the first liquid crystal display and the second liquid crystal display are provided on both sides of the backlight, and the first liquid crystal display is provided. 2. A display device, wherein the liquid crystal display and the second liquid crystal display have different sizes. 3. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, the first liquid crystal display and the second liquid crystal display on both sides of the backlight, and the first liquid crystal display. Or at least one of the second liquid crystal displays has a liquid crystal display panel for applying an electric field substantially parallel to the substrate surface to a liquid crystal layer injected and sealed between a pair of substrates. Display device. 4. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, the display device having a first liquid crystal display and a second liquid crystal display on both sides of the backlight. Or at least one of the second liquid crystal displays described above includes a liquid crystal display panel including a plasma discharge cell. 5. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, the display device having a first liquid crystal display and a second liquid crystal display on both sides of the backlight. Or the at least one of the second liquid crystal displays has a film having an effect of enlarging the viewing angle on the surface of the liquid crystal display far from the backlight. 6. A display device comprising a liquid crystal display and a backlight for illuminating the liquid crystal display, the display device having a first liquid crystal display and a second liquid crystal display on both sides of the backlight. Or at least one of the second liquid crystal displays comprises a plasma discharge cell, and has a film having an effect of enlarging the viewing angle on the surface of the liquid crystal display far from the backlight. Display device. 7. The film having the effect of enlarging the viewing angle has a light diffraction effect.
Alternatively, the display device according to claim 6. 8. The film according to claim 5, wherein the film having the effect of expanding the viewing angle has an effect of reducing the viewing angle dependence of the phase difference of light transmitted through the liquid crystal display. Display device described. 9. The backlight according to claim 1, wherein the backlight is a sidelight type backlight having a light guide plate and a light source arranged on a side surface of the light guide plate. The display device according to item 1. 10. The backlight has two wedge-shaped light guide plates whose oblique sides are overlapped with each other, and two light sources arranged on a side surface of each light guide plate. The display device according to claim 9. 11. The display device of claim 10, further comprising a single reflector between the light guide plates. 12. The backlight is a direct type backlight in which a plurality of light sources are arranged on the back side of the first liquid crystal display and the second liquid crystal display. The display device according to any one of claims 1 to 6. 13. The backlight has a reflection plate having a plurality of concavo-convex portions, and the plurality of light sources are alternately arranged in concave regions on both surfaces of the reflection plate. Item 12. A display device according to item 12. 14. The light source according to claim 13, wherein the number of light sources arranged on the first liquid crystal display side and the number of light sources arranged on the second liquid crystal display side are the same with the reflection plate as a boundary. Display device. 15. The display device according to claim 13, wherein a part of the irradiation light can pass through the reflection plate. 16. The display device according to claim 13, wherein the reflection plate has an opening in a part of each of the uneven portions. 17. A monitor device using the display device according to claim 1. Description: 18. A video game device using the display device according to claim 1. Description: 19. An information processing apparatus using the display device according to claim 1. Description: