JP2001201741A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct view and reflective liquid crystal display device with a high quality display equipped with a transparent substrate such as a touch panel or a protective plate. SOLUTION: A polarizing plate 23 on the front side of a liquid crystal cell 2 is mounted on the rear side of a fixing substrate 4 of a resistance film type touch panel 1. A transparent film 32 is mounted on the front side of the liquid crystal cell via an adhesive 31. A reflection preventing layer 33 is formed on the surface of the transparent film 32. A polarizing plate 24 on the rear side with a reflection plate is mounted on the rear side of the liquid crystal cell 2. The touch panel 1 on which the polarizing plate 23 is mounted and the liquid crystal cell 2 are fixed holding a gap as shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a direct-viewing reflective liquid crystal display device in which a transparent substrate such as a touch panel or a protection plate is placed on the display surface side of a liquid crystal cell. It is.

[0002]

2. Description of the Related Art In recent years, a large number of liquid crystal display devices, which take up little space, are light, and have low power consumption, are widely used for monitors on desks and displays of portable devices. In particular, a direct-view reflection-type liquid crystal display device does not require a backlight, and thus consumes lower power. Therefore, it is often used for portable equipment. Among them, there is a product in which not only a display function but also a touch panel is mounted on a display surface side of a liquid crystal cell to integrate input and output.

FIG. 9 is a perspective view of such a liquid crystal display device with a touch panel, and FIG. 10 is a sectional view taken along line EE 'of FIG. The liquid crystal display device shown in FIG. 9 includes a liquid crystal cell 50 and a touch panel 51. The liquid crystal cell 50 includes an element (not shown), a signal wiring 52, a pixel electrode 53, and a terminal 54.
Element-side substrate 55 on which a counter electrode 56 and a terminal 57 are formed.
Are adhered to each other via a sealing material 59 so as to match the pattern at a constant interval. The element (not shown) has a switching function, and a thin film diode or the like is used. The thin film diode is provided between the signal wiring 52 and the pixel electrode 53 for each pixel.

A liquid crystal material 60 is sealed between the element-side substrate 55 and the opposite-side substrate 58, is formed on the inner surfaces of both substrates, and has a predetermined alignment state in accordance with an alignment film (not shown) which has been rubbed. take. This alignment state and the opposing substrate 5
8 and a device-side substrate 55
The light is modulated by the combination of the polarizing plate 62 with the reflection plate provided on the back side of the device to perform an arbitrary display. The orientation state is
An arbitrary electric signal can be given through the circuit members 63 and 64, and the electric signal can be changed by applying an electric field between the pixel electrode 53 and the counter electrode 56. Thus, the amount of light transmission of each pixel can be controlled. Display text and images.

[0005] The polarizing plate 61 usually comprises an adhesive 65 and a polarizing film 66. In addition, the polarizing plate 62 with a reflection plate,
From the element side substrate 55 side, an adhesive 67, a polarizing film 68,
It comprises an adhesive 69 and a reflection plate 70. The polarizing films 66 and 68 are obtained by stretching and orienting a polyvinyl alcohol film on which a dichroic substance such as an iodine complex is adsorbed in a certain direction, and sandwiched between two base substrates of cellulose triacetate. Having a structure.

The base substrate often contains an ultraviolet absorber to prevent the polarizer and the liquid crystal material from being deteriorated by ultraviolet rays. As the reflector 70, one capable of both reflection and transmission as well as a pure reflection function is often used.

The touch panel 51 has a structure in which a fixed substrate 72 on which a solid electrode 71 is formed and a flexible substrate 74 on which a solid electrode 73 is formed are bonded with an adhesive 75 such that the electrode surfaces face each other. A spacer 77 is provided on the surface of the touch panel 51 for the purpose of preventing the solid electrodes 71 and 73 from unnecessarily coming into contact with each other only when the object 76 is pressed.

The touch panel 51 is a resistive touch panel. When a solid electrode 71 and a solid electrode 73 come into contact with each other, a voltage detected at that position is measured, and the voltage is measured at a distance from the strip electrode 78 or 79. This is a method of electrically detecting the contact position by utilizing the fact that it is proportional to. Such a resistive touch panel is disclosed in, for example, Japanese Patent Publication No. 10-283117.

[0009]

Generally, a liquid crystal cell 50 is provided.
And the touch panel 51 are directly fixed using an adhesive tape or indirectly fixed using a housing of the product. However, there is a slight air layer between the liquid crystal cell 50 and the touch panel 51. I do. In such a case, since the refractive index is different between the substrate material and the air, the reflection occurs at the boundary, and the display quality deteriorates.

The refractive index of glass which is a material of the liquid crystal cell 50 and the fixed substrate 72 of the touch panel 51 is about 1.5, and the refractive index of polyethylene terephthalate which is a material of the flexible substrate 74 of the touch panel 51 is about 1.6. The refractive index of cellulose triacetate, which is the material of the base substrate of the polarizing film 66, is about 1.5, and the refractive index of the acrylic optical adhesive used as the adhesive 65 is 1.5 to 1.6. Reflection at the interface between the air and the air having a refractive index of 1 is large.

In FIG. 10, the reflection o in the touch panel 51 and the reflection p on the rear surface of the touch panel 51 are large, and are added to the reflection q for display, which causes deterioration in display quality.

Various measures have been proposed to suppress such a decrease in display quality. A method of providing an anti-reflection layer on the substrate surface of the touch panel, a method of adhering the liquid crystal cell and the touch panel with a transparent double-sided tape, a method of filling the gap between the liquid crystal cell and the touch panel with a liquid, and a method of using a flexible plate for the liquid crystal cell with the flexible touch panel And a method of integrally manufacturing a liquid crystal cell and a touch panel.

However, any of the methods can be expected to have an effect of suppressing unnecessary reflection, but the reliability is lowered,
There is a problem that the manufacturing process becomes complicated and the manufacturing cost increases.

The present invention relates to a direct-view reflective liquid crystal display device having a transparent substrate such as a touch panel or a protective plate.
It is an object to provide a liquid crystal display device capable of high-quality display.

[0015]

In order to achieve the above object, a liquid crystal display device according to the present invention comprises: a transparent substrate; a direct-viewing-type reflective liquid crystal cell disposed with a gap between the transparent substrate; And a polarizing film provided on the back surface of the transparent substrate.

According to this configuration, even if there is a gap between the transparent substrate and the liquid crystal cell, there is no interface with the air layer on the back side of the transparent substrate, so that the contrast does not decrease. By bonding the polarizing film to the transparent substrate, the number of steps for bonding the film to be charged to the liquid crystal cell is reduced, and problems such as electrostatic breakdown of the liquid crystal cell hardly occur. In addition, the presence of the gap improves the assemblability of the device.

Incidentally, an antireflection treatment is applied to a side of the liquid crystal cell facing the polarizing film, or a transparent film is adhered. The transparent film has optical isotropy and has at least one of an antireflection function and an ultraviolet absorption function.

If the transparent substrate is a fixed substrate in a resistive touch panel, an optical film is provided (bonded) on the fixed substrate side of the resistive touch panel, so that the touch of the touch panel is not impaired. In addition, a clear display can be obtained.

Further, if the transparent substrate is a touch substrate in an ultrasonic type, capacitive coupling type or optical type touch panel, and the surface thereof is subjected to an antireflection treatment, the ultrasonic substrate having no air layer therein. Since a touch panel of a system, a capacitive coupling system, or an optical system can be used, and reflection of the surface can be prevented, a clearer display can be obtained.

If the transparent substrate is a protective plate of the liquid crystal cell, the protective plate can protect the polarizing plate of the liquid crystal cell and can suppress deterioration of display quality.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Four embodiments will be described below, and experiments performed in adopting each embodiment will be described. In consideration of the assemblability of the liquid crystal display device, the display quality of the liquid crystal display device having the following configuration was evaluated on the assumption that it is desirable that there be a gap between the liquid crystal cell and a transparent substrate such as a touch panel. Since the sharpness of the display is determined by the magnitude of the contrast between black and white, the experiment measured the reflectance of each of black and white.

The liquid crystal display devices evaluated were the following A to G (see Table 1). In Table 1, a is a liquid crystal cell, b is a touch panel, c is a glass substrate, d is a polarizing plate constituting the optical system of the liquid crystal cell, e is a polarizing plate with a reflector constituting the optical system of the liquid crystal cell, and f is reflection. It is a prevention layer.

A: Only liquid crystal cell a B: Structure in which touch panel b is arranged with liquid crystal cell a and air layer interposed C: Structure in which front side polarizing plate d is mounted on the surface of a flexible substrate of touch panel b in B D : B: Structure in which a front-side polarizing plate d is mounted on the back surface of a fixed substrate of a touch panel b. E: D: Structure in which a transparent film having an antireflection layer f formed on the surface side of a liquid crystal cell a is adhered. F: Liquid crystal cell a A structure in which a glass plate c is disposed with an air layer interposed therebetween. In G: F, a front-side polarizing plate d is mounted on the back surface of the glass substrate c, and a transparent film having an antireflection layer f formed on the surface side of the liquid crystal cell a is attached. Structure worn

Since the material of the uppermost surface of the liquid crystal display device is different due to the difference in structure, a transparent film having an antireflection layer formed on the uppermost surface is attached to each structure. By doing so, it is possible to compare the intensity of reflection by the air layer in the touch panel and between the touch panel and the liquid crystal cell or between the glass substrate and the liquid crystal cell.

The liquid crystal cell used and the measurement conditions are as follows. Liquid crystal cell: Active matrix drive type liquid crystal cell using diode Optical system: TN alignment, normally white type Polarization system: Front side Nitto Denko NPF-EG1225DU Back side Nitto Denko NPF-EG4225P1 Touch panel: Resistive film type measuring device: Minolta CM2002 Measurement conditions: Use of diffused light source, receive light at 8mm, measure reflection intensity at 550nm wavelength Room temperature

[0026]

[Table 1]

Table 1 shows the measurement results. Simply liquid crystal cell a
In the structure (B) in which the touch panel b and the touch panel b are arranged, the black reflectance is significantly increased and the contrast is low as compared with the liquid crystal cell a alone (A). Further, in the structure (C) in which the front-side polarizing plate d is conventionally mounted on the surface of the flexible substrate of the touch panel b, the reflectance of black can be suppressed, but there is a problem that white becomes dark.

In the structure (D) in which the front side polarizing plate d is mounted on the back surface of the fixed substrate of the touch panel b, the black reflectance is higher than that of (B) while maintaining the brightness of white as in (B). Increase can be suppressed. Further, in the structure (E) in which the transparent film having the antireflection layer f formed on the surface side of the liquid crystal cell a is adhered, the black reflectance at the front is almost the same as that of (D), but the display is oblique. It is easier to see.

Further, in the structure (F) in which the touch panel b is replaced with a glass plate c on the assumption that the air layer in the touch panel is removed, even though there is an air layer between the touch panel b and the liquid crystal cell a, The black reflectance is greatly reduced.
In the structure (G) in which the front-side polarizing plate d is mounted on the back surface of the glass substrate c and the transparent film on which the antireflection layer f is formed is adhered to the front surface of the liquid crystal cell a, the structure only includes the liquid crystal cell (A) The black reflectance is equivalent to that of, and the display at an angle is easy to see.

An embodiment of the present invention will be described below with reference to the drawings in consideration of the results shown in Table 1. FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention, and FIG.
FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1. The touch panel 1 has a structure in which the touch panel 1 is placed on the front side of a liquid crystal cell 2. The touch panel 1 is a resistive touch panel. A fixed substrate 4 on which a solid electrode 3 is formed and a flexible substrate 6 on which a solid electrode 5 is formed are bonded with an adhesive 7 so that their electrode surfaces face each other. Take the structure.

A spacer 9 is provided on the surface of the touch panel 1 in order to prevent the solid electrodes 3 and 5 from unnecessarily coming into contact with each other only when the object 8 is pressed. The contact position of the object 8 is electrically detected via the strip electrodes 10 and 11 connected to the solid electrodes 3 and 5.

The liquid crystal cell 2 is of an active drive type using a thin film diode as a switching element.
2 and the opposing substrate 13 are adhered to each other with a certain space therebetween via a sealing material 14. On the element side substrate 12, a wiring 15, a pixel electrode 16, and a terminal 17 are formed, and a thin film diode (not shown) is formed between the wiring 15 and the pixel electrode 16 for each pixel.

The opposing substrate 13 is provided with an opposing electrode 18.
And a terminal 19 are formed. A liquid crystal material 20 is sealed between the element-side substrate 12 and the opposing-side substrate 13, and is formed on the inner surfaces of both substrates, and assumes a predetermined alignment state according to an alignment film (not shown) that has been rubbed.

In the display of the liquid crystal display device, a voltage is applied to the pixel electrode 16 and the counter electrode 18 via the circuit members 21 and 22, and the alignment state of the liquid crystal molecules changes according to the voltage and the polarization plate 23 on the front side is changed. This is performed by using the polarizing plate 24 with the reflecting plate on the rear side. In the present embodiment, the polarizing plate 23 on the front side is used.
Is mounted on the back surface of the fixed substrate 4 of the touch panel 1 and includes an adhesive 25 and a polarizing film 26. The polarizing plate 24 with a reflector on the back side is mounted on the back surface of the liquid crystal cell 2, and includes an adhesive 27, a polarizing film 28, an adhesive 29, and a reflector 30 from the element-side substrate 12 side.

The touch panel 1 on which the polarizing plate 23 is mounted and the liquid crystal cell 2 are fixed with a gap therebetween as shown in the figure.
For fixing, a method that allows easy attachment and detachment, such as attaching a double-sided tape around the liquid crystal cell 2 or through a housing of a product in which the device is incorporated, may be used. With such a structure, the interface between the fixed substrate 4 of the conventional touch panel 1 and the air becomes the interface between the fixed substrate 4 and the adhesive 25 having a small difference in the refractive index, so that the reflection a at this interface is suppressed.

The counter substrate 13 of the liquid crystal cell 2 is newly added.
B occurs at the interface between the light and the air, but the light passes through the front-side polarizing plate 23 having a transmittance of about 40% twice, resulting in reflection having a sufficiently small intensity, and the brightness of black displayed by the liquid crystal display device. Can be suppressed. Since the order of the optical materials such as the polarizing plates through which the reflection c contributing to the display passes does not change, the necessary optical system can be realized as before.

Since the display pattern is projected on the polarizing film 26 of the front-side polarizing plate 23 mounted on the fixed substrate 4 of the touch panel 1, the sense of floating of the display due to the gap between the touch panel 1 and the liquid crystal cell 2 is suppressed. You can also. Furthermore, since the polarizing plate 23 is mounted on the rigid fixed substrate 4, even if a mounting error occurs, the polarizing plate 23 can be easily peeled off from the fixed substrate 4 and reprocessed.

The step of attaching a polarizing plate to the liquid crystal cell 2 includes:
This is a step in which the liquid crystal cell 2 is easily charged, and particularly in a liquid crystal cell using an active element, the element may be destroyed by static electricity. In the present embodiment, since the process of attaching the polarizing plate to the liquid crystal cell 2 is performed once on each side, problems such as element destruction due to charging of the liquid crystal cell 2 are reduced.

Since the touch panel 1 has no electrodes such as diodes and transistors, and has only electrodes, the influence of static electricity is small and the mounting of the polarizing plate 23 does not matter. Further, since the polarizing plate is not attached to the flexible substrate 6 of the touch panel 1, the touch of the touch panel is not spoiled.

FIG. 3 is a perspective view of a liquid crystal display device according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along line BB 'in FIG. The liquid crystal display device of FIG. 3 differs from the liquid crystal display device of the first embodiment of FIG. 1 in that a transparent film 32 is newly mounted on the surface side of the liquid crystal cell 2 with an adhesive 31 interposed therebetween.
The main configuration of the touch panel 1 and the liquid crystal cell 2 does not change. On the surface of the transparent film 32, an antireflection layer 33 is formed by coating with an oxide or the like.

Since the interface between the fixed substrate 4 of the touch panel 1 and the air is the interface between the fixed substrate 4 having a small difference in refractive index and the adhesive 25, the reflection d at this interface is suppressed as in the first embodiment. . Further, by providing the transparent film 32, the interface between the opposing substrate 13 of the liquid crystal cell 2 and the air becomes the interface with the adhesive 31, so that the reflection e is suppressed.

The reflection on the surface of the transparent film 32 is also suppressed by the antireflection layer 33. Therefore, the influence of unnecessary reflection on the reflection f that contributes to display is further reduced, and a decrease in contrast due to the touch panel can be reduced. Although the transparent film 32 is added to the optical system through which the reflection f passes, there is no problem if a material having optical isotropy such as cellulose triacetate is used.

Conventionally, the polarizing film 26 of the polarizing plate 23 may have an ultraviolet absorbing function in order to prevent the liquid crystal material 20 from being deteriorated by ultraviolet rays. However,
Since there is a distance between the polarizing plate 23 and the opposing substrate 13 of the liquid crystal cell 2, ultraviolet rays may enter the liquid crystal material 20 and deteriorate the liquid crystal material 20. The problem can be solved by attaching a sufficiently wide range of polarizing film to a touch panel having a large size compared to a liquid crystal cell, but the whole device becomes large. Therefore, if the transparent film 32 is provided with an ultraviolet absorbing function, the liquid crystal material 2
Deterioration due to UV light of 0 can be easily prevented.

In the first and second embodiments, the touch panel 1
A method for effectively and easily suppressing reflection by an air layer between the liquid crystal cell 2 and the liquid crystal cell 2 has been described. Considering the results in Table 1,
If a single-panel touch panel containing no air layer is used, further improvement can be expected.

As the touch panel, the resistive touch panel of the above two embodiments is widely used. As a single-substrate touch panel, an ultrasonic touch panel, a capacitive coupling touch panel, an optical touch panel, etc. Kaihei 8-305
481, JP-A-8-77894, JP-A-8-78894
No. 2,725,372.

FIG. 5 is a perspective view of a liquid crystal display device according to a third embodiment of the present invention, and FIG. 6 is a sectional view taken along the line CC 'in FIG. In the present embodiment, an ultrasonic touch panel is used. In the ultrasonic touch panel 34, a reflective element 36 is provided around a glass substrate 35, and a pair of transducers 37 for transmitting and receiving ultrasonic waves are provided on two orthogonal sides.

The transducer 37 is connected to an external circuit board (not shown) through a lead wire (not shown). The detection of the position where the object has contacted the
Is monitored over time, and the time at which the gain of the received surface acoustic wave changes is converted into a distance to perform the measurement.

In the first and second embodiments, the liquid crystal display device is constituted by a liquid crystal cell using two polarizing plates. Although a similar configuration may be used, a liquid crystal cell 38 of a single polarizing plate type can be used in the present embodiment.
For example, the pixel electrode 16 is formed of a reflective electrode material such as aluminum to have a reflective function, and there is no polarizer with a reflector on the back surface of the liquid crystal cell.

A retardation film 40 is mounted on the surface of the opposite substrate 13 of the liquid crystal cell 38 with an adhesive 39 interposed therebetween. The retardation film 40 also has an antireflection layer 4 on its surface.
1 is formed. The front-side polarizing plate 23 is mounted on the back surface of the glass substrate 35 of the touch panel 34.

At this time, the liquid crystal display device comprises a polarizing plate 23, a retardation film 40, a liquid crystal material 20, an in-cell reflector (here, the pixel electrode 16), a liquid crystal material 20, a phase difference Since it has an optical system that passes through the film 40 and the polarizing plate 23 and passes through the polarizing plate only twice, a bright display can be performed even with limited ambient light. Since the reflection h and the reflection i are suppressed as in the first and second embodiments, the ultrasonic touch panel 3 not including the air layer.
4, the reduction in contrast can be significantly suppressed.

In the case of the ultrasonic touch panel 34, the surface acoustic wave does not propagate to the back surface of the glass substrate 35, so that the function of the touch panel is not impaired even if the polarizing plate 23 is mounted. In addition, since there is no problem that a flexible substrate such as a resistive touch panel is bent, even if an antireflection layer is formed on the surface side of the glass substrate 35, cracks do not occur. In this case, the reflection j can also be suppressed.

Further, the retardation film 40 can be mounted on the back surface of the glass substrate 35 of the touch panel 34. In this case, since there is no optical film to be stuck on the liquid crystal cell, there is no need for a charging step that causes static electricity failure, thereby improving reliability.

In the above three embodiments, the liquid crystal display device constituted by the touch panel and the liquid crystal cell has been described. However, the present invention can be applied to not only a touch panel but also a protective plate as long as it is a transparent substrate. That is, the present invention can be applied to a liquid crystal display device provided with a transparent substrate such as an acrylic plate or a glass plate as a protective plate so that the polarizing plate is not damaged.

FIG. 7 is a perspective view of a liquid crystal display device provided with a protective plate according to a fourth embodiment of the present invention, and FIG.
It is DD 'sectional drawing in a middle. The configuration of the liquid crystal cell 2 is the second
This is the same as the embodiment. That is, the reflection k that contributes to the display
Has an optical system that passes through two polarizing plates and one reflecting plate by a polarizing plate 23 and a polarizing plate 24 with a reflecting plate.

The protective plate is composed of a glass plate 42, and the polarizing plate 23 is mounted on the back surface thereof. A transparent film 32 on which an antireflection layer 33 is formed is mounted on the surface of the opposite substrate 13 of the liquid crystal cell 2 via an adhesive 31.

With such a configuration, the reflection l and the reflection m
Is suppressed. The reflection n on the surface of the glass plate 42 can be reduced by forming a hard anti-reflection layer (not shown) on the surface side. Therefore, the lowering of the contrast can be suppressed even in the protective plate and the liquid crystal cell provided via the air layer. If the transparent film 32 has an ultraviolet absorbing function, it is possible to prevent the liquid crystal material 20 from deteriorating due to ultraviolet rays.

In the above, in the fourth embodiment, the liquid crystal cell of the active drive using the thin film diode has been described as an example. However, the present invention is not limited to this, and the active matrix using the thin film transistor and the simple matrix without the switching element are used. The present invention can be applied to a driving direct-view type reflection type liquid crystal cell. In addition to the liquid crystal cell of the TN mode and the single polarizing plate system,
It can be widely applied to a direct-view type display device provided with a polarizing plate on at least the surface side such as an STN method.

Further, the ultraviolet absorbing function may be included in the adhesive instead of the optical film itself. A transparent substrate and liquid crystal cell can be obtained by simply attaching a double-sided tape to a part of the substrate or fixing it with a simple method such as screwing. For the purpose of preventing foreign matter from entering, sealing may be performed with a resin spacer, tape, or the like.

[0059]

As described above, according to the present invention, the polarizing plate constituting the optical system of the liquid crystal cell is moved to the back side of the transparent substrate, so that even if there is a gap between the transparent substrate and the liquid crystal cell, the transparent substrate Since there is no interface with the air layer on the back side of the device, the contrast does not decrease in display.

In addition, since the polarizing plate is in close contact with the transparent substrate, the floating feeling in the display disappears even if there is a distance between the transparent substrate and the liquid crystal cell. By bonding the optical film to the transparent substrate side, the number of steps of bonding the film to be charged to the liquid crystal cell is reduced, and the occurrence of defective liquid crystal cells due to static electricity can be reduced.

Further, since the transparent substrate and the liquid crystal cell can be assembled with a space therebetween, the assemblability of the device is improved.
Further, for example, in the case of a liquid crystal cell using a flexible material such as plastic as a substrate, the liquid crystal cell is bent, so that the workability of the work of attaching the polarizing plate may be inferior, and the corner of the liquid crystal cell may be bent during the work, resulting in a defect. However, according to the present invention, such a problem can be eliminated.

When the anti-reflection treatment is performed on the side of the liquid crystal cell facing the polarizing film, since there is no interface between the liquid crystal cell and the air layer, unnecessary reflection is reduced and a clearer display is obtained. Can be

A transparent film was bonded to the liquid crystal cell on the side facing the polarizing film, and the transparent film had optical isotropy and at least one of an antireflection function and an ultraviolet absorption function. In this case, the display quality is not improved or the liquid crystal material in the liquid crystal cell is not deteriorated by ultraviolet rays, which can contribute to the improvement of reliability.

When a retardation film is adhered to the liquid crystal cell on a side facing the polarizing film, and the retardation film has at least one of an antireflection function and an ultraviolet absorbing function, There is no need to provide a new transparent film.

When an optical film is bonded to the fixed substrate side of the resistive touch panel, a clear display can be obtained without impairing the touch of the touch panel.

When an ultrasonic type, capacitively coupled type or optical type touch panel which does not contain an air layer is used, the reflection of the surface can be prevented.
The display quality can be further improved.

Further, the polarizing plate of the liquid crystal cell can be protected by the protective plate, and the deterioration of display quality can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a perspective view of a second embodiment of the present invention.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a perspective view of a third embodiment of the present invention.

FIG. 6 is a sectional view of FIG.

FIG. 7 is a perspective view of a fourth embodiment of the present invention.

FIG. 8 is a sectional view of FIG. 7;

FIG. 9 is a perspective view of a conventional liquid crystal display device.

FIG. 10 is a sectional view of FIG. 9;

[Explanation of symbols]

1, 51 Touch panel 2, 50 Liquid crystal cell 3, 5, 71, 73 Solid electrode 4, 72 Fixed substrate 6, 74 Flexible substrate 7, 75 Adhesive 8, 76 Object 9, 77 Spacer 10, 11, 78, 79 Band-shaped electrodes 12, 55 Element-side substrate 13, 58 Opposite-side substrate 14, 59 Sealant 15, 52 Signal wiring 16, 53 Pixel electrode 17, 19, 54, 57 Terminal 18, 56 Counter electrode 20, 60 Liquid crystal material 21, 22 , 63, 64 Circuit members 23, 61 Polarizers 24, 62 Polarizers with reflectors 25, 27, 29, 31, 39, 65, 67, 69
Adhesive 26, 28, 66, 68 Polarizing film 30, 70 Reflecting plate 32 Transparent film 33, 41 Antireflection layer 34 Ultrasonic touch panel 35 Glass substrate 36 Reflective element 37 Transducer 38 Single-sheet polarizing plate liquid crystal cell 40 Phase difference film 42 glass plates a to q rays

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H091 FA08Z FA11Z FA14Z FA37Z FB02 FC07 FD06 GA08 GA13 GA17 LA03 LA07 LA17 MA10 5G435 AA01 AA02 AA14 AA16 AA17 BB12 BB16 EE33 EE37 EE47 FF00 FF01 H03 FF03 GG03

Claims (7)

[Claims] 1. A transparent substrate, a direct-view reflective liquid crystal cell disposed with a gap between the transparent substrate, and a polarizing film provided on a back surface of the transparent substrate. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein an antireflection treatment is applied to a side of the liquid crystal cell facing the polarizing film. 3. A transparent film is adhered to the liquid crystal cell on a side facing the polarizing film, and the transparent film has optical isotropy and has at least one of an antireflection function and an ultraviolet absorption function. 2. The liquid crystal display device according to claim 1, having two functions. 4. A retardation film is adhered to the liquid crystal cell on a side facing the polarizing film, and the retardation film has at least one of an antireflection function and an ultraviolet absorption function. The liquid crystal display device according to claim 1. 5. The method according to claim 1, wherein the transparent substrate is a fixed substrate in a resistive touch panel.
The liquid crystal display device according to claim 4. 6. The touch substrate of an ultrasonic, capacitively coupled, or optical touch panel, wherein the surface of the touch substrate is subjected to an anti-reflection treatment. The liquid crystal display device according to claim 1. 7. The liquid crystal display device according to claim 1, wherein said transparent substrate is a protective plate of said liquid crystal cell.