JPH06160835A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To attain thinning and light weight by providing plural first and second electrodes in columnar line fashion so as to intersect with each other at the confronting planes of two phase difference compensation plates, respectively. CONSTITUTION:A coordinate detection signal controller 301 controls a first shift register 305 and a second shift register 307 by receiving a control signal from the outside. The shift registers 305, 307 scan connected first and second electrodes sequentially, respectively, and select coordinates formed in matrix shape sequentially. A coordinate detection processing circuit 303 detects the position of a depressed coordinate by calculating the coordinate at a timing when a voltage is induced to an input pen 400 by designating the coordinate by depressing the input pen 400 on a desired coordinate, and outputs it as coordinate data. The coordinate data is assembled in display data, and a liquid crystal cell driving circuit 200 displays the data by driving a liquid crystal cell 101 based on the display data.

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 liquid crystal display device having a coordinate input display function for designating a desired coordinate position with an input pen and displaying the coordinate.

[0002]

2. Description of the Related Art Liquid crystal display devices have been widely used as display elements for televisions, graphic displays and the like by taking advantage of their features such as thinness and low power consumption. For example, a TN (Twisted Nematic) type liquid crystal is used in this liquid crystal display device, but in recent years, STN (Super Twisted Nematic;
One using a super twisted nematic type liquid crystal is drawing attention. Further, as a liquid crystal display device suitable for realizing a color display image, an ECB (Electronic Controlled Bi
The one using a refringence type liquid crystal display element has been noticed and put to practical use. In all of these liquid crystal display devices, the transmitted light of the liquid crystal cell is colored with an interference color due to the birefringence effect of the liquid crystal, so that good colorization is often hindered. Therefore, in order to compensate for such interference colors and eliminate the coloring of the transmitted light of the liquid crystal cell, a liquid crystal cell for phase difference compensation or a phase difference compensation plate for compensating the interference color is superimposed on the front surface of the liquid crystal cell for display. A liquid crystal display device having a different structure has been devised.

By the way, in addition to keyboard input, a desired figure or character is handwritten on the screen by using a coordinate input means such as an input pen, and the coordinates of the handwritten input figure or character are read and displayed. Display on screen,
So-called pen input devices have been developed. A liquid crystal display device using this pen input device has already been developed, and most of them have a structure in which a coordinate detection tablet having electrodes formed in a matrix is placed in front of a display liquid crystal cell. ing. When a desired figure is drawn with the input pen, the electrodes at the coordinates corresponding to the position pressed by the input pen make electrical contact, or the electrodes are scanned with a scanning signal and detected by the pen by electrostatic coupling. Thus, the position of that coordinate is detected. Then, the pixel on the screen of the display liquid crystal cell corresponding to the detected coordinate position is turned on. In this way, the input figures and characters are displayed on the display screen.

However, when the coordinate detecting tablet is placed on the display liquid crystal cell in an overlapping manner, the thickness and weight of the display panel portion increases, and the liquid crystal display device is made thinner.
There is a problem that it hinders weight reduction.

Therefore, as a method of solving this, for example, as disclosed in Japanese Unexamined Patent Publication No. 62-73289, coordinate detection is performed on each of the facing surfaces of the display liquid crystal cell substrate and the facing polarizing plate. There has been proposed a technique of arranging electrodes for use at right angles to each other and forming coordinates at each intersection.

However, in this method, one of the electrodes for coordinate detection is formed on the second main surface (front surface) of the substrate of the display liquid crystal cell. Therefore, even if only one of the coordinate detection portion and the display portion is defective, both of them become defective products, and there is a problem that the manufacturing yield is reduced. Further, a liquid crystal display device having a structure in which a liquid crystal cell for phase difference compensation for compensating interference colors or a phase difference compensating plate is superposed on the front surface of the liquid crystal cell for display is compared with a liquid crystal display device not using a phase difference compensating means. Since the thickness of the phase difference compensator has already been added, if a coordinate detection tablet, etc. is placed on top of it, the thickness and weight of the display panel will increase, and even a single film will be thin and lightweight. In the case of a liquid crystal display device in which it is desirable to improve the efficiency, there is a problem that it is an obstacle.

Further, in the above-mentioned publications, a first electrode and a second electrode are provided on the respective opposing main surfaces of the polarizing plate and the film substrate arranged so as to face the polarizing plate. Then place these electrodes facing each other,
A technique has also been proposed in which coordinates are formed at each intersection.

However, in this method, a film substrate facing the polarizing plate must be added, the thickness of the display panel portion is increased by the thickness of the film substrate, and transmitted light is absorbed by the film substrate. Therefore, there is a problem that the transmittance decreases. There is also a problem that the material cost is increased by adding the film substrate.

[0009]

As described above, in a liquid crystal display device in which it is desirable to reduce the thickness and weight of the liquid crystal display device, it is possible to reduce the thickness and weight of the coordinate detection tablet by stacking them on top of each other. There was a problem that it interfered with.

The present invention has been made in order to solve such a problem, and an object thereof is to add a coordinate detecting means to a liquid crystal display device while avoiding an obstacle to the reduction in thickness and weight. An object is to provide a liquid crystal display device.

[0011]

In order to solve the above-mentioned problems, a liquid crystal display device of the present invention includes a display liquid crystal cell and an anisotropic refractive index for compensating the interference color of transmitted light of the display liquid crystal cell. Display device having one or a plurality of retardation compensating plates each having a property, a polarizing plate sandwiching the display liquid crystal cell and the retardation compensating plate, and a liquid crystal cell driving circuit for driving the display liquid crystal cell In, each of the facing surfaces of the two opposing phase difference compensating plates, or both the front and back surfaces of the phase difference compensating plate, or the facing surfaces of the phase difference compensating plate and the polarizing plate are arranged in a row and intersect each other. A plurality of first electrodes and a plurality of second electrodes, an input pen for selectively designating coordinates formed at each intersection of the first electrode and the second electrode, and The position of the coordinate specified by the input pen It is characterized by comprising coordinate position detecting means for detecting the position and a display liquid crystal cell drive circuit for displaying the position of the coordinate on the display liquid crystal cell.

Alternatively, a display liquid crystal cell, a retardation compensation liquid crystal cell having a refractive index anisotropy for compensating an interference color of transmitted light of the display liquid crystal cell, the display liquid crystal cell and the retardation compensation liquid crystal cell. In a liquid crystal display device having a polarizing plate for sandwiching a liquid crystal cell and a liquid crystal cell drive circuit for driving the display liquid crystal cell, a line is provided on each of the opposing main surfaces of the two substrates of the phase difference compensating liquid crystal cell. A plurality of first electrodes and a plurality of second electrodes that are provided and intersect each other;
An input pen for selectively designating coordinates formed at each intersection of the first electrode and the second electrode; and coordinate position detecting means for detecting the position of the coordinates designated by the input pen, And a display liquid crystal cell driving circuit for displaying the position of the coordinates on the display liquid crystal cell.

[0013]

In the liquid crystal display device according to the present invention, the function equivalent to that of the conventional so-called coordinate detection tablet is provided by each of the opposing surfaces of the two phase difference compensating plates facing each other or both the front and back surfaces of the phase difference compensating plate. Alternatively, the plurality of first electrodes and the plurality of second electrodes are arranged in a row so as to intersect with each other on the respective facing surfaces of the phase difference compensating plate and the polarizing plate. Or 2 of the liquid crystal cell for phase difference compensation
This is realized by arranging a plurality of first electrodes and a plurality of second electrodes in a row so as to face each other and be orthogonal to each other on the main surfaces of the substrates that face each other. That is, a phase difference compensating plate for compensating the interference color of the display liquid crystal cell or a phase difference compensating liquid crystal cell is provided with electrodes for coordinate detection.

Therefore, when the conventional so-called coordinate detecting tablet is separately superposed on the display liquid crystal cell, the thickness of the coordinate detecting tablet is directly added to the thickness of the display panel portion. The liquid crystal display device according to the present invention is almost completely eliminated, and it is possible to realize a liquid crystal display device in which coordinate detecting means is added to the liquid crystal display device without hindering the thinning and weight reduction of the liquid crystal display device.
Moreover, since the retardation compensating plate is usually formed of a material having an appropriate elasticity such as a stretched resin film such as polycarbonate or polyvinyl alcohol, it is suitable for pressing with the input pen.

[0015]

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

(Embodiment 1) As shown in FIG. 1, the liquid crystal display device of the first embodiment has a liquid crystal display panel section 100, a liquid crystal cell drive circuit section 200, a coordinate position detecting section 300, and
A main part of the input pen 400 is formed.

As shown in FIG. 2, the liquid crystal display panel section 100 includes a display liquid crystal cell 101, two phase difference compensating plates 119 and 121 arranged so as to be superposed on the display liquid crystal cell 101, and two phase difference compensating plates sandwiching these. The polarizing plate 131, 133 of FIG.

The display liquid crystal cell 101 is provided with an X (signal) electrode 103 and a Y (scanning) electrode 105 made of a transparent conductive film such as ITO, and alignment films 107 and 109 made of a resin, which are arranged to face each other. Substrates 111 and 113 made of a transparent material such as thin glass, and a liquid crystal composition 115 sandwiched between these substrates 111 and 113 in a so-called cell gap, the periphery of which is sealed with a sealant (not shown). And a resin ball spacer 117 for holding the substrate gap, a main part thereof is formed.

The substrate gap of the display liquid crystal cell 101, a so-called cell gap, is set to about 6.5 μm, and the alignment film 1 is formed.
A rubbing orientation treatment is applied to 07 and 109. As the liquid crystal composition 115, a liquid crystal composition having a natural pitch of 12 μm and having a left-handed twist property was used. As a result, the display liquid crystal cell 101 is an STN type liquid crystal cell having a twist structure with a twist angle of 240 degrees between both substrates. The X (signal) electrodes 103 and the Y (scanning) electrodes 105 of the display liquid crystal cell 101 are arranged in columns of 640 and 400, respectively, and a pixel is formed at each of the intersections where these electrodes face each other. . Therefore, the pixels are formed in 640 × 400 pixels. The electrode pitch and the electrode width at this time are 0.31 mm and 0.31 mm for the X (signal) electrode 103, respectively.
mm, and the Y (scanning) electrode 105 is 0.28 mm and 0.28 mm.
mm. The display screen size is about 9.2 inches.

The two retardation compensating plates 119 and 121 are retardation compensating films using a stretched resin film,
On each of the facing surfaces, a plurality of first electrodes 123 and a plurality of second electrodes 125 are arranged in a row and face each other so as to be orthogonal to each other. Coordinates are formed at each intersection of the plurality of first electrodes 123 and the plurality of second electrodes 125 orthogonal to each other. And two
The phase difference compensating plates 119 and 121 are adhered to each other with an adhesive 129 with a resin ball spacer 127 interposed therebetween.

As the resin stretched film, a film obtained by sandwiching a polycarbonate film stretched in one direction to impart refractive index anisotropy with transparent protective films having an isotropic refractive index was used. Then, I is sputtered on the surface by I
A TO film is formed and patterned by a photo-etching method, and is arranged in the same direction as the first electrode 123 and the Y (scanning) electrode 105 which are arranged in the same direction as the X (signal) electrode 103. The second electrodes 125 are formed respectively. The first electrode 123 has an electrode pitch of 4.8 mm and an electrode width
There are 27 lines in 1 mm. In addition, the second electrode 125
Has 43 electrodes with an electrode pitch of 4.8 mm and an electrode width of 4 mm.

Then, such two phase difference compensating plates 1
By superimposing 19 and 121 on the display liquid crystal cell 101 and sticking them together, the display liquid crystal cell 101 is used as a phase difference compensating plate for compensating for interference color due to birefringence of transmitted light and also as a coordinate position detection tablet. is doing.

At this time, in order to compensate the interference color due to the birefringence of the transmitted light of the display liquid crystal cell 101, the cell gap d = 6.5 μm of the display liquid crystal cell 101 and the refractive index anisotropy of the liquid crystal composition. Corresponding to Δn = 0.105, the retardation value R of the stretched resin film of the phase difference compensating plates 119 and 121 is set to 360 nm, and at this time, the stretching direction of the two phase difference compensating plates 119 and 121 and the polarizing plates 131,
The directions of the respective polarization axes of 33 were set as shown in FIG.

The liquid crystal cell drive circuit section 200 includes a drive voltage generation circuit 201, a Y electrode drive IC 203, and an X electrode drive I.
Its main part is composed of C205. The drive voltage generation circuit 201 is supplied with a power supply voltage from an external power supply, generates a drive voltage for driving the liquid crystal cell, and sends it to the Y electrode drive IC 203 and the X electrode drive IC 205.
The Y electrode driving IC 203 line-sequentially selects the Y (scanning) electrodes 105 based on a control signal from the outside and applies a scanning pulse to them. The X electrode driving IC 205 outputs a signal voltage X (signal) based on a control signal and display data from the outside.
It is applied to the electrode 103.

The coordinate position detector 300 includes a coordinate detection signal controller 301, a coordinate detection processing circuit 303, and a first coordinate detection signal controller 301.
Shift register 305 and second shift register 30
Its main part is composed of 7. The coordinate detection signal controller 301 receives the control signal from the outside and
Shift register 305 and second shift register 3
Control 07. Then, the first shift register 305 and the second shift register 307 sequentially scan the connected first electrode 123 and second electrode 125, respectively, and use the first electrode 123 and the second electrode 125, respectively. The coordinates formed in a matrix are sequentially selected.

When the voltage is induced in the input pen 400 by pressing the input pen 400 to a desired coordinate and designating the coordinate, the coordinate detection processing circuit 303 calculates and presses from the timing at that time. The coordinate position is detected and output as coordinate data. The coordinate data is incorporated into the display data, and the liquid crystal cell drive circuit unit 200 drives the display liquid crystal cell 101 based on the display data, and the pixel corresponding to the position of the coordinate is lit to perform display. In this embodiment, a function such as the coordinate detection tablet of the capacitive coupling type is provided with two phase difference compensating plates 119 and 12.
It is given to 1.

Thus, the phase difference compensating plates 119 and 121 are
By also using as a coordinate position detecting tablet, the coordinate detecting function can be added to the liquid crystal display device without preventing the liquid crystal display device from becoming thinner and lighter.

In the case of the present embodiment, the accuracy and operability of coordinate detection are about 10% lighter and about 20% lower than those of the conventional liquid crystal display device with coordinate position detection tablet.
% Thinning has been achieved. Moreover, the phase difference compensation plate 119,
121 is formed of a material having appropriate elasticity such as the above-mentioned polycarbonate or stretched resin film such as PVA, and is not destroyed even when pressed by an input pen, and is suitable for such applications. It is possible to reduce the thickness and weight of the liquid crystal display device by avoiding the use of a film substrate for electrodes or the like separately from these.

In the present embodiment, the function of the coordinate detection tablet of the capacitive coupling type is provided to the two phase difference compensating plates 119 and 121, but it is not limited to the capacitive coupling type. . In addition to this, for example, the input pen 400
It is also possible to use a so-called contact method in which the electrical continuity of the intersection of the first electrode 123 and the second electrode 125 corresponding to the coordinate pressed by is detected and the coordinate position thereof is calculated.

In this embodiment, the phase difference compensator is
Although two sheets are used, in the case of a liquid crystal display device in which only one sheet is used, for example, the first electrodes 123 which are orthogonal to each other as described above are provided on the front surface and the back surface of the single phase difference compensating plate, respectively.
The second electrode 125 and the second electrode 125 may be arranged in a row, and a coordinate may be formed at each intersection.

Alternatively, one phase difference compensating plate and the first electrode 123 and the second electrode 125 as described above are arranged on the respective facing surfaces of the polarizing plate facing the phase difference compensating plate. Alternatively, the coordinates may be formed for each intersection. Even in this case, needless to say, it is possible to avoid adding the electrode substrate or the like separately.

(Embodiment 2) In the liquid crystal display device of the second embodiment, instead of the two phase difference compensating plates 119 and 121 in the first embodiment, the function and display of the coordinate position detecting tablet are used. A phase difference compensating liquid crystal cell 501 having a function of compensating for the interference color of the liquid crystal cell 101 was used.
The other structure is almost the same as that of the first embodiment.

As shown in FIG. 4, the structure of the liquid crystal cell 501 for compensating the phase difference is, as shown in FIG. 4, a first electrode 503 made of a transparent conductive film such as ITO, a second electrode 505 and alignment films 507, 509 made of resin. And a liquid crystal composition in which the peripheries of the substrates 511 and 513 are made of transparent resin films and are opposed to each other, and the periphery of the substrates 511 and 513 is sealed with a sealant (not shown). 515,
A resin ball spacer 517 that holds the substrate gap (cell gap) and a main part thereof are configured. The substrate gap of this phase difference compensating liquid crystal cell 501, a so-called cell gap, is set to about 6.5 μm, and the alignment films 507 and 509 are subjected to rubbing alignment treatment. Also, the liquid crystal composition 5
No. 15 has a right-handed twist with a natural pitch of 12 μm,
A liquid crystal composition having a refractive index anisotropy Δn = 0.100 was used. The first electrode 503 has an electrode pitch of 4.8 mm and an electrode width of 1 m.
There are 27 rows of m. The second electrodes 505 are arranged in 43 rows with an electrode pitch of 4.8 mm and an electrode width of 4 mm.
The phase difference compensating liquid crystal cell 501 has an outer size of about 9.2 inches, which is the same as the display liquid crystal cell 101, and is laminated and attached so as to cover the entire surface of the display liquid crystal cell 101. At this time, in order to compensate the interference color of the display liquid crystal cell 101, the alignment direction of the liquid crystal molecules of the retardation compensation liquid crystal cell 501 (rubbing direction of the alignment film) and the alignment direction of the display liquid crystal cell 101 (alignment film orientation). The rubbing direction) was set to the direction shown in FIG.

As described above, the liquid crystal cell 501 for phase difference compensation
By also using as a coordinate position detection tablet of the capacitive coupling type, the coordinate detection function can be added to the liquid crystal display device without preventing the liquid crystal display device from becoming thinner and lighter.

In the second embodiment, the resin film substrate is used as the transparent substrate of the liquid crystal cell for retardation compensation, but the present invention is not limited to this. It is also possible to use a thin glass plate or the like made of a material that can withstand the pressure applied by the input pen 400. In addition, it goes without saying that various changes such as changes of materials used for the liquid crystal cell for retardation compensation and the liquid crystal cell for display can be made without departing from the scope of the present invention.

[0036]

As described above in detail, according to the present invention, a liquid crystal display device in which a coordinate detection function is added to the liquid crystal display device is provided, while avoiding an obstacle to reduction in thickness and weight. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a liquid crystal display device according to a first embodiment.

FIG. 2 is a partially omitted perspective view showing a liquid crystal display panel section of the liquid crystal display device according to the first embodiment.

FIG. 3 is a diagram showing a stretching direction of a retardation compensation plate and a polarization axis direction of a polarizing plate of the liquid crystal display device of the first embodiment.

FIG. 4 is a partially omitted perspective view showing a liquid crystal cell for phase difference compensation of a liquid crystal display device according to a second embodiment.

FIG. 5 is an alignment (rubbing) direction of a liquid crystal cell for phase difference compensation and a liquid crystal cell for display 1 of a liquid crystal display device according to a second embodiment.
The figure which shows the orientation (rubbing) direction of 01.

[Explanation of symbols]

100 ... Liquid crystal display panel section, 119, 121 ... Phase difference compensating plate, 123 ... First electrode, 125 ... Second electrode, 12
7 ... Resin sphere spacer, 129 ... Adhesive, 200 ... Liquid crystal cell drive circuit section, 300 ... Coordinate position detecting section, 400 ... Input pen, 501 ... Phase difference compensating liquid crystal cell, 503 ... First electrode, 505 ... 2 electrodes, 507, 509 ... Alignment film,
511, 513 ... Substrate, 515 ... Liquid crystal composition, 517 ...
Resin ball spacer

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[Procedure amendment]

[Submission date] August 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Liquid crystal display devices have been widely used as display elements for televisions, graphic displays and the like by taking advantage of their features such as thinness and low power consumption. This liquid crystal display device includes, for example, TN (Twisted Ne).
A liquid crystal such as a "matic" (twisted nematic) type is used, but a liquid crystal of a simple matrix drive system is particularly used.
Since a high contrast ratio can be obtained in the display device,
STN (Super Twisted Nematic);
One using a super twisted nematic type liquid crystal is drawing attention . Both the liquid crystal display device of these is often the transmitted light of the liquid crystal cell thus good colorization is hindered to be colored by the interference color due to the birefringence effect of liquid crystal. Therefore, in order to compensate for such interference color and eliminate the coloring of the transmitted light of the liquid crystal cell, a liquid crystal cell for phase difference compensation or a phase difference compensation plate for compensating for interference color is superimposed on the front surface of the liquid crystal cell for display. A liquid crystal display device having a different structure has been proposed .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The substrate gap of the liquid crystal cell 101 for display, a so-called cell gap, is set to about 6.5 μm, and the alignment films 107 and 109 are subjected to rubbing alignment treatment.
Further, as the liquid crystal composition 115, a liquid crystal composition having a natural pitch of 12 μm and having a left-handed twist property was used. As a result, the display liquid crystal cell 101 is an STN type liquid crystal cell having a twisted structure with a twist angle of 240 degrees between both substrates. The X (signal) electrodes 103 and the Y (scanning) electrodes 105 of the display liquid crystal cell 101 are arranged in columns of 640 and 400, respectively, and a pixel is formed at each portion where these electrodes face and intersect. . So the pixel is 640x
It is formed of 400 pixels. Further, the electrode pitch and the electrode width at this time are determined by the X (signal) electrodes 103, respectively.
0.28 mm and 0.28 mm, and the Y (scanning) electrode 105 is 0.31 mm and 0.31 mm . The display screen size is about 9.2 inches.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

As the resin stretched film, a film obtained by sandwiching a polycarbonate film stretched in one direction to impart refractive index anisotropy with transparent protective films having an isotropic refractive index was used. Then, I is sputtered on the surface by I
A TO film is formed and patterned by a photo-etching method, and is arranged in the same direction as the first electrode 123 and the Y (scanning) electrode 105 which are arranged in the same direction as the X (signal) electrode 103. The second electrodes 125 are formed respectively. Forty- three first electrodes 123 are arranged in a row with an electrode pitch of 4.8 mm and an electrode width of 4 mm . In addition, the second electrode 12
No. 5 has 27 electrodes arranged in a row with an electrode pitch of 4.8 mm and an electrode width of 1 mm .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

As shown in FIG. 4, the structure of the liquid crystal cell 501 for compensating the phase difference is, as shown in FIG. 4, a first electrode 503 made of a transparent conductive film such as ITO, a second electrode 505 and alignment films 507, 509 made of resin. And a liquid crystal composition in which the peripheries of the substrates 511 and 513 are made of transparent resin films and are opposed to each other, and the periphery of the substrates 511 and 513 is sealed with a sealant (not shown). 515,
A resin ball spacer 517 that holds the substrate gap (cell gap) and a main part thereof are configured. The substrate gap of this phase difference compensating liquid crystal cell 501, a so-called cell gap, is set to about 6.5 μm, and the alignment films 507 and 509 are formed.
Is subjected to rubbing orientation treatment. As the liquid crystal composition 515, a liquid crystal composition having a natural pitch of 12 μm and having a right-handed twist property and a refractive index anisotropy Δn = 0.100 was used. The first electrode 503 has an electrode pitch of 4.8 mm,
43 electrodes are arranged in a row with an electrode width of 4 mm . The second electrodes 505 are arranged in 27 lines with an electrode pitch of 4.8 mm and an electrode width of 1 mm . The phase difference compensating liquid crystal cell 501 is
The external dimensions are about 9.2 inches, which is the same as the display liquid crystal cell 101, and the display liquid crystal cell 101 is laminated and attached so as to cover the entire surface. At this time, in order to compensate the interference color of the display liquid crystal cell 101, the alignment direction of the liquid crystal molecules of the liquid crystal cell 501 for phase difference compensation (rubbing direction of the alignment film) and the alignment direction of the liquid crystal cell 101 for display (alignment film). The rubbing direction) was set to the direction shown in FIG.

Claims (2)

[Claims] 1. A display liquid crystal cell, one or more retardation compensating plates having a refractive index anisotropy for compensating an interference color of transmitted light of the display liquid crystal cell, the display liquid crystal cell and In a liquid crystal display device having a polarizing plate sandwiching a phase difference compensating plate and a display liquid crystal cell driving circuit for driving the display liquid crystal cell, each of the facing surfaces of the two facing phase difference compensating plates,
Alternatively, a plurality of first electrodes and a plurality of first electrodes arranged in a row on each of the front and back surfaces of the phase difference compensating plate or on each of the facing surfaces of the phase difference compensating plate and the polarizing plate and intersecting each other. Two electrodes, an input pen for selectively designating coordinates formed at each intersection of the first electrode and the second electrode, and coordinates for detecting the position of the coordinates designated by the input pen A liquid crystal display device comprising: a position detection means; and a display liquid crystal cell drive circuit for displaying the position of the coordinates on the display liquid crystal cell. 2. A display liquid crystal cell, a retardation compensation liquid crystal cell having a refractive index anisotropy for compensating an interference color of transmitted light of the display liquid crystal cell, the display liquid crystal cell and the retardation compensation liquid crystal cell. In a liquid crystal display device having a polarizing plate sandwiching a liquid crystal cell and a liquid crystal cell drive circuit for driving the display liquid crystal cell, the phase difference compensating liquid crystal cell is provided on each of the facing main surfaces of two substrates facing each other. A plurality of first electrodes and a plurality of second electrodes that are arranged in a line and intersect each other, and coordinates formed at each intersection of the first electrode and the second electrode are described. An input pen for selectively designating, a coordinate position detecting means for detecting a position of a coordinate designated by the input pen, and a display liquid crystal cell driving circuit for displaying the coordinate position on the display liquid crystal cell. Liquid characterized by Crystal display device.