JP2000284758A - Information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a large type screen at a low cost, require less power consumption, and moreover, display a necessary moving picture without impairing an updating speed by providing the device with a means for selecting a start line and an end line for updating a display screen, and displaying the moving picture in an area between the start line and the end line. SOLUTION: A liquid crystal display element 100 has three layers of laminated cells of which each seals chiral-nematic liquid crystal between a substrate where scanning electrode groups are formed thereon and a substrate where signal electrode groups are formed thereon, to display a picture in full color. A CPU 20 receives picture data and data concerning a display area from an external device such as a personal computer and a communication line via an interface 50, and further, discriminates whether the picture data is a still picture data or a moving picture data. And, the CPU 20 selects an update start line and an update end line and executes display updation (moving picture display). Therefore, a time interval for displaying a moving picture can be shorter than that for updating the whole screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information display device, and more particularly to an information display device capable of displaying a moving image in addition to a still image.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a device which simultaneously displays an image such as a public information or an advertisement where information does not change and an image whose information changes every moment such as text news to a viewer. A display that constantly displays information that changes at high speed is a CRT or TFT that can follow the information update speed at high speed.
Liquid crystal is adopted. In such a conventional moving image display device, all display pixels are controlled in the same direction, and screen updating is sequentially performed at the same timing.

[0003] Conventional display devices capable of high-speed display are expensive. In particular, in the case of a large-sized display having a large number of pixels, the price increases sharply more than the area ratio. In addition, a large high-speed display device consumes a large amount of power, requires a large installation, and is contrary to demands for energy saving and environmental consideration.

It is also conceivable to arrange a plurality of conventional display units side by side to individually display still images and moving images. However, this only increases the number of devices, and saves energy and reduces the size of the entire apparatus. It does not essentially solve such a request.

The present applicant is studying a display device using a chiral nematic liquid crystal, which can produce a large-sized display device at low cost and has a memory function for display, thereby suppressing power consumption. But,
The chiral nematic liquid crystal has a problem that the response speed at the time of driving is relatively slow, and when the number of pixels is large on a large screen, the update speed is insufficient for displaying a moving image.

On the other hand, when using the display device, it is not always necessary to make the whole screen a moving image, and there are quite a few situations where only a part of the display area should be made a moving image and the rest should be a still image. For example, a display of an exchange rate or a display of a measuring instrument in which only a numerical value display portion changes every moment, a display that displays an advertisement (still image) and text news (moving image) in combination, or the like.

Accordingly, an object of the present invention is to provide an information display device which can produce a large (high pixel count) screen at low cost, consumes less power, and can display a necessary moving image without significantly impairing the update speed. It is in.

[0008]

In order to achieve the above objects, the present invention has a memory property in which a chiral nematic liquid crystal exhibiting a cholesteric phase at room temperature is sandwiched between a scanning electrode group and a signal electrode group. An information display device comprising a liquid crystal display element and displaying an image by driving the liquid crystal display element in a matrix, comprising means for selecting an update start line and an update end line of a display screen, a start line and an end line, The video is displayed in the area between. Alternatively, the display screen is divided into a plurality of display areas along at least the scan electrodes, and a moving image is displayed in at least one display area.

[0009] Even if a liquid crystal display element composed of a chiral nematic liquid crystal that performs matrix driving requires a long time to update the entire large screen, it is divided only in a part of the area, particularly by the scanning electrodes. If the selected partial area is updated, the display can be updated in a short time, and even a moving image can be displayed without discomfort. For example, to update the display of one line, 1
Even if the display element requires msec, if only 50 lines are used as a moving image display area, the update time is 0.05 sec, and it can be sufficiently recognized as a moving image.

As described above, according to the present invention, even a liquid crystal display element composed of a chiral nematic liquid crystal that performs matrix driving with a relatively slow update speed can display a moving image in a partial area of the screen. In combination with the still image display in other areas, effective and rich information display can be achieved. When a chiral nematic liquid crystal is used, one line can be updated in about 1 msec, and a large-sized (high-pixel-number) display can be produced at low cost. In addition, since it has a memory property, there is an advantage that power is not required for displaying a still image other than when updating the still image.

In the information display device, a plurality of regions for displaying a moving image may be provided. By providing a plurality of moving image display areas, display with higher expressiveness can be performed.

Further, the liquid crystal display device may include a plurality of liquid crystal layers stacked on each other, and the plurality of liquid crystal layers may be simultaneously driven to display a moving image. By doing so, a moving image with good visibility can be displayed.

Further, the entire screen may be rewritten at a predetermined timing. By doing so, the display can be updated even for the area where the moving image is not displayed.

In any case, the moving image display area may include the number of scanning electrodes that does not exceed the upper limit of the number of scanning electrodes that can be observed as a moving image.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the information display device according to the present invention will be described below with reference to the accompanying drawings.

(Configuration and Control of Information Display Device) FIG. 1 shows an embodiment of an information display device according to the present invention. This device 1
0 indicates that the matrix control type liquid crystal display device (display) 100 is controlled by the control circuit 3 according to a command from the CPU 20.
0 controls and drives the drive IC 130, and further includes a video memory 40. The liquid crystal display element 100 has a structure in which a cell in which a chiral nematic liquid crystal is sealed is stacked in three layers between a substrate on which a scanning electrode group is formed and a substrate on which a signal electrode group is formed so as to perform full color display. is there. The specific configuration of the liquid crystal display element 100 will be described later.

The CPU 20 receives image data and data relating to a display area from an external device such as a personal computer or a communication line via the interface 50,
Further, it identifies whether the image data is still image data or moving image data. Then, the display data is transferred to a predetermined display area of the video memory 40 based on the received data. Further, the CPU 20 transmits information of the display area and information of whether the image is a still image or a moving image to the control circuit 30.

The video memory 40 has a liquid crystal display element 100
Is stored. The video memory 40 has addresses on the memory corresponding to all the pixels of the liquid crystal display element 100, and the density and color information of each pixel are stored in each address as bit data. The control circuit 30 controls the driving IC 13 based on the information in the video memory 40.
0 is controlled to perform writing on the liquid crystal display element 100.

As shown in FIG. 2, the pixel configuration of one display layer constituting the liquid crystal display element 100 includes a plurality of scanning electrodes R1, R2 to Rm and signal electrodes C1, C2 to Cn.
(N and m are natural numbers). The scan electrodes R1, R2 to Rm are connected to output terminals of the scan drive IC 131, and the signal electrodes C1, C2 to Cn are connected to the signal drive IC1.
32 output terminals. Such a pixel configuration and a driving IC are provided for each display layer of each color of red, green, and blue.

The scan drive IC 131 includes scan electrodes R1, R
A selection signal is output to a predetermined one of 2 to Rm to be in a selected state, and a non-selection signal is output to other electrodes to be in a non-selected state. The scan driving IC 131 sequentially switches the scan electrodes R1, R2 to R2 while switching the electrodes at predetermined time intervals.
A selection signal is applied to Rm. On the other hand, the signal drive IC 1
32 simultaneously outputs a signal corresponding to image data to each of the signal electrodes C1, C2 to Cn in order to rewrite each pixel on the scanning electrodes R1, R2 to Rm in the selected state. For example,
When the scanning electrode Ra is selected (a is a natural number satisfying a ≦ m), the scanning electrode Ra and each of the signal electrodes C1, C2 to Cn
, The pixels LRa-C1 to LRa-Cn at the intersection with are rewritten simultaneously. Thereby, the voltage difference between the scanning electrode and the signal electrode in each pixel becomes the rewriting voltage of the pixel,
Each pixel is rewritten according to the rewriting voltage.

Here, assuming that the first threshold voltage for untwisting the liquid crystal exhibiting the cholesteric phase is Vth1, after applying the voltage Vth1 for a sufficient time, the second threshold voltage smaller than the first threshold voltage Vth1 is set. When the voltage is lowered to the threshold voltage Vth2 or less, a planar state is set. Further, when a voltage of Vth2 or more and Vth1 or less is applied for a sufficient time, a focal conic state is established. These two states are stably maintained even after the voltage application is stopped. Also, Vth1 to Vth
By applying a voltage between the two, halftone display, that is, gradation display is possible.

The control circuit 30 generates two addresses corresponding to two lines in the vertical and horizontal directions of the liquid crystal display element 100 (the horizontal direction is referred to as a scanning line, and the vertical direction is referred to as a signal line), and a combination of the addresses is sequentially designated. I will do it. As shown in FIG. 3, assuming that the two addresses are A and B, the contents of the video memory 40 corresponding to the display coordinates A and B, which are the combination, are read and the display is updated.

The above control is described in more detail as shown in FIG. Here, the liquid crystal display element 100 has 1024 horizontal (scanning lines) pixels and 76 vertical (signal lines).
It is assumed that there are eight pixels, and each pixel has one byte (256) of gradation or color information. The address of the video memory 40 corresponding to such a display area is 00000h
−786432 bytes of CFFFh (1024 × 76
8). The addresses on the liquid crystal display element 100 side are A0-A767 in the vertical direction and B0-B1023 in the horizontal direction.

If all screens are to be updated, the CP
The update instruction address transferred from U20 to the control circuit 30 is 0000h-CFFFFh. Control circuit 30
Specifies these addresses in order and converts them into display addresses A and B. Address N on video memory 40
Is converted into display addresses A and B by the following equation, for example. In the following equation, “INT” represents an operation that takes an integer part of a calculation result, and “MOD” represents an operation that takes a remainder of the calculation result.

A = INT (N / 1024) B = MOD (N / 1024)

Then, for a scan electrode corresponding to a certain display address A, display data of a display address B is sequentially read from the video memory 40 and latched by a latch circuit in the control circuit 30. Then, the scan driving IC 1 is selected so as to select the scan electrode corresponding to the address A.
31 and also controls the signal drive IC 132 based on the latched display data of one line to write a one-line image.

On the other hand, when updating not a whole screen but only a partial area, the update instruction address transferred from the CPU 20 to the control circuit 30 is only a partial area of the video memory 40. For example, when continuously updating 64 scan lines on the video memory 40, B0000h-BFFF
Fh is transferred to the control circuit 30.

In the present embodiment, data relating to the display area is received together with moving image data from an external device such as a personal computer or a communication line via the interface 50, and an update start line and an update end line for the display area are received based on the data. Is determined. Of course, the display area may be fixed, and data relating to the display area may not be transmitted from an external device or a communication line.

As described above, if the update start line and the update end line are selected and the display update (moving image display) is executed in an area between them, the display update time interval is shorter than that of the full screen update. I'm done. In the display element 100 using the chiral nematic liquid crystal, although it depends on the material of the liquid crystal composition, the driving waveform, and the like, typically, it takes about 1 msec to update one line. Therefore, if only the area of 64 lines is updated, the update cycle is about 64 msec. In other words, the display rate is about 15 times per second. If the screen can be updated at such a time interval, human eyes can perceive a slight flicker, but can sufficiently recognize the moving image.

Therefore, the upper limit of the number of scan electrodes that can be observed as a moving image is grasped in advance, and data relating to the display area of the moving image transmitted from an external device or the like is used. What is necessary is just to fall within the range included in the display area.

It should be noted that, even when the control in which the continuous updating is limited to a partial area is executed, the CPU 20 may rewrite the contents of the video memory 40 outside the updating area. However, it is preferable that the rewriting result is not immediately reflected on the display, but is rewritten at the next full screen update.

In the above control example, the case where one pixel is one byte has been described. However, in a full color display, three bytes are allocated to one pixel. In this case, the operation is the same as that described above except that the memory amount is tripled. Alternatively, three memories may be provided corresponding to the red, green, and blue display layers. In any case, when displaying a moving image, the display layers are simultaneously driven to display the moving image.
This makes it possible to display a moving image with good visibility without color shift or the like.

By controlling the partial rewriting method for one display screen in this way, for example, the screen shown in FIG. 5 can be configured. The still image display area occupying most of the screen is not constantly updated, but is rewritten at a predetermined timing, for example, at a relatively long time interval, for example, once a day. On the other hand, the contents of the video memory 40 are constantly transferred to the lower band-like moving image display area, and information (news, moving characters, etc.) that changes every moment is displayed.

It should be noted that the moving image display area in one screen is not always required to be one, and a moving image can be displayed in a plurality of areas as shown in FIG. In this case, the CPU
20 transfers a plurality of start lines and end lines to the control circuit 30. In the address configuration shown above, A80
00h-AFFFFh and C0000h-C7FFFFh
Is transferred, the moving image is displayed in an area surrounded by these scanning lines. In this example, the moving image display area is 32 lines each, that is, a total of 64 lines.
Five updates are performed. In this case, the sum of the scanning lines included in the plurality of moving image display areas may be set so as to fall within the upper limit of the number of scanning lines for which moving images are possible.

(Liquid Crystal Display Element) Next, a liquid crystal display element using a liquid crystal exhibiting a cholesteric phase used as a display will be described.

(Structure) FIG. 7 shows an example of the structure of a liquid crystal display device. In the liquid crystal display element 100, a red display layer 111R for performing display by switching between red selective reflection and a transparent state is disposed on the light absorbing layer 121, and display is performed thereon by switching between green selective reflection and a transparent state. Green display layer 1
11G, and a blue display layer 111B on which display is performed by selectively reflecting blue and switching between transparent states.
Are stacked to perform a reflective display.

Each display layer 111R, 111G, 111B
Has a structure in which a resin columnar structure 115, a liquid crystal 116 and a spacer 117 are sandwiched between transparent substrates 112 on which transparent electrodes 113 and 114 are formed, respectively. Transparent electrode 11
An insulating film 118 and an orientation control film 119 are provided on the 3, 114 as needed. Further, a sealing material 1 for sealing the liquid crystal 116 is provided on an outer peripheral portion (outside the display area) of the substrate 112.
20 are provided.

The transparent electrodes 113 and 114 are respectively connected to the control circuit 30, and a predetermined pulse voltage is applied between the transparent electrodes 113 and 114 by the control circuit 30. In response to the applied voltage, the display is switched between a transparent state in which the liquid crystal 116 transmits visible light and a selective reflection state in which visible light of a specific wavelength is selectively reflected.

The transparent electrodes 113 and 114 provided on each of the display layers 111R, 111G and 111B are composed of a plurality of strip electrodes arranged in parallel at a fine interval, respectively. They are opposed so as to be at right angles. Current is sequentially applied to these upper and lower strip electrodes. That is, display is performed by sequentially applying a voltage to each liquid crystal 116 in a matrix. This is called matrix driving. By performing such matrix driving sequentially or simultaneously for each display layer, a full-color image is displayed on the liquid crystal display element 100.

More specifically, in a liquid crystal display device in which a liquid crystal exhibiting a cholesteric phase is sandwiched between two substrates, display is performed by switching the state of the liquid crystal between a planar state and a focal conic state. When the liquid crystal is in the planar state, assuming that the helical pitch of the cholesteric liquid crystal is P and the average refractive index of the liquid crystal is n, light of wavelength λ = P · n is selectively reflected. Also,
In the focal conic state, the light is scattered when the selective reflection wavelength of the cholesteric liquid crystal is in the infrared light range, and transmits visible light when the wavelength is shorter than that. Therefore, by setting the selective reflection wavelength in the visible light region and providing a light absorbing layer on the side opposite to the observation side of the element indicated by arrow A, the display of the selective reflection color in the planar state and the display of black in the focal conic state are achieved. Will be possible. In addition, by setting the selective reflection wavelength in the infrared light range and providing a light absorption layer on the side opposite to the observation side of the element, light in the infrared light range is reflected in the planar state, but the wavelength in the visible light range is reflected. Is transmitted, so that a black display and a white display due to scattering in the focal conic state are possible.

(Full Color Display) Each display layer 111R, 1
In the liquid crystal display element 100 in which 11G and 111B are stacked, the blue display layer 111B and the green display layer 111G are in a transparent state in which liquid crystals are in a focal conic arrangement, and the red display layer 111R is in a selective reflection state in which liquid crystals are in a planar arrangement. By doing so, red display can be performed. Also,
Yellow display can be performed by setting the blue display layer 111B in a transparent state in which liquid crystals are in a focal conic arrangement, and setting the green display layer 111G and the red display layer 111R in a selective reflection state in which liquid crystals are in a planar arrangement. . Similarly, by appropriately selecting the state of each display layer between a transparent state and a selective reflection state, red, green, blue, white,
Display of cyan, magenta, yellow, and black is possible. Further, by selecting an intermediate selective reflection state as the state of each of the display layers 111R, 111G, and 111B, an intermediate color can be displayed, and the display layer can be used as a full-color display element.

Each display layer 11 in the liquid crystal display element 100
The order of lamination of 1R, 111G, and 111B may be other than that shown in FIG. However, considering that the transmittance of the light in the long wavelength region is higher than that in the short wavelength region, the selective reflection wavelength of the liquid crystal contained in the upper layer is changed to that of the liquid crystal contained in the lower layer. When the wavelength is shorter than the wavelength, more light is transmitted to the lower layer, so that a bright display can be performed. Therefore, the observation side (the direction of arrow A)
From the blue display layer 111B, the green display layer 111G,
The red display layer 111R is most desirable, and this state provides the most preferable display quality.

(Various Materials of Display Element) As the transparent substrate 112, a colorless and transparent glass plate or a transparent resin film can be used. As a material for the transparent resin film,
Polycarbonate resin, polyether sulfone resin,
Polyethylene terephthalate resin, norbornene resin,
Polyarylate resins, amorphous polyolefin resins, modified acrylate resins, and the like are included. The characteristics of the resin film include high translucency, no optical anisotropy, dimensional stability,
It has surface smoothness, friction resistance, bending resistance, high electrical insulation, chemical resistance, liquid crystal resistance, heat resistance, moisture resistance, gas barrier properties, etc., and has the necessary characteristics according to the environment and application used. You just have to choose what you have.

The transparent electrodes 113 and 114 are made of ITO.
(Indium Tin Oxide) and other transparent electrodes can be used, and metal electrodes such as aluminum and silicon, or amorphous silicon and BSO (Bismuth Silicon Oxid) can be used.
A photoconductive film such as e) can also be used. Further, as the lowermost transparent electrode 114, a black electrode can be used including a role as a light absorbing layer.

As the insulating film 118, an inorganic film such as silicon oxide or an organic film such as a polyimide resin or an epoxy resin is used so as to function also as a gas barrier layer.
12 to prevent short circuit and improve the reliability of the liquid crystal. In addition, polyimide is a typical example of the orientation control film 119.

The liquid crystal 116 preferably exhibits a cholesteric phase at room temperature. In particular, a chiral nematic liquid crystal obtained by adding a chiral dopant to a nematic liquid crystal is suitable.

The chiral dopant is an additive having a function of twisting the molecules of the nematic liquid crystal when added to the nematic liquid crystal. By adding a chiral dopant to a nematic liquid crystal, a helical structure of liquid crystal molecules having a predetermined twist interval is generated, thereby exhibiting a cholesteric phase.

The chiral nematic liquid crystal has the advantage that the pitch of the helical structure can be changed by changing the addition amount of the chiral dopant, whereby the selective reflection wavelength of the liquid crystal can be controlled. In addition,
In general, as a term representing the pitch of the helical structure of liquid crystal molecules, a “helical pitch” defined by a distance between molecules when the liquid crystal molecules rotate 360 degrees along the helical structure of the liquid crystal molecules is used.

As a material used for the columnar structure 115, for example, a thermoplastic resin can be used. For this purpose, a material which is softened by heating and solidified by cooling, is desired not to cause a chemical reaction with a liquid crystal material to be used and to have appropriate elasticity.

Specific examples include polyvinyl chloride resin, polyvinylidene chloride resin, polymethacrylate resin, polyacrylate resin, polyvinyl acetate resin, polystyrene resin, polyamide resin, polyethylene resin, polypropylene resin, and fluorine resin. Resins, polyurethane resins, polyacrylonitrile resins, polyvinyl ether resins, polyvinyl ketone resins, polyvinyl pyrrolidone resins, polycarbonate resins, chlorinated polyether resins, saturated polyester resins, and the like.

The columnar structure 115 may be formed of a material containing at least one of them or a mixture thereof, or a material containing at least one or a mixture thereof.

The above substance is printed by a known printing method using a pattern so as to form dot columns as shown in FIG. Depending on the size of the liquid crystal display element and the pixel resolution, the size of the cross-sectional shape, the arrangement pitch, and the shape (column,
Drum-shaped, polygonal, etc.) are appropriately selected. The electrode 11
It is more preferable to arrange the columnar structures 115 preferentially between the three because the aperture ratio is improved.

The spacer 117 is preferably a particle made of a hard material that does not deform when heated or pressed. For example, finely divided glass fibers, inorganic materials such as ball-shaped silicate glass and alumina powder, or organic synthetic spherical particles such as divinylbenzene-based crosslinked polymers and polystyrene-based crosslinked polymers can be used.

As described above, the hard spacer 117 for keeping the gap between the two substrates 112 at a predetermined size, and the pair of substrates 112 which are arranged in the display area based on a predetermined arrangement rule and adhere and support the pair of substrates 112. By providing a resin structure 115 mainly composed of a thermoplastic polymer material,
2, the two substrates 112 are firmly supported, there is no uneven arrangement, and the generation of bubbles can be suppressed in a low-temperature environment.

(Production Example of Liquid Crystal Display Element) Here, a production example of the liquid crystal display element 100 will be briefly described.

First, a plurality of strip-shaped transparent electrodes are formed on two transparent substrates, respectively. The transparent electrode is an IT
After an O film is formed by a sputtering method or the like, patterning is performed by a photolithography method.

Next, a transparent insulating film and an orientation control film are formed on the transparent electrode forming surface of each substrate. The insulating film and the orientation control film can be formed by a known method such as a sputtering method, a spin coating method, or a roll coating method using an inorganic material such as silicon oxide or an organic material such as a polyimide resin.

The rubbing treatment is not usually performed on the orientation control film. Although the function of the alignment control film is not yet clear, it is thought that the presence of the alignment control film can have a certain degree of anchoring effect on liquid crystal molecules.
It is possible to prevent the characteristics of the liquid crystal display element from changing over time. In addition, a function as a color filter may be provided by adding a dye to these thin films to improve color purity and contrast.

Thus, a resin structure is formed on the electrode forming surface of one of the substrates provided with the transparent electrode, the insulating film, and the alignment control film. The resin structure is a printing method in which a paste-like resin material obtained by dissolving a resin in a solvent is extruded with a squeegee through a screen stencil or a metal mask, and printing is performed on a substrate mounted on a flat plate, a dispenser method, or an inkjet method. For example, it can be formed by a method in which a resin material is discharged onto a substrate from the tip of a nozzle, or a transfer method in which a resin material is supplied onto a flat plate or a roller and then transferred to the substrate surface. . It is desirable that the height at the time of forming the resin structure is larger than the desired thickness of the liquid crystal display layer.

A sealing material is provided on the electrode forming surface of the other substrate by using an ultraviolet curable resin, a thermosetting resin, or the like. The sealant is arranged in a continuous ring at the outer edge of the substrate. The arrangement of the sealing material, like the resin structure described above, a method of forming a resin by discharging a resin from the tip of a nozzle onto a substrate, such as a dispenser method or an inkjet method, a screen plate, a printing method using a metal mask, or the like, After the resin is formed on a flat plate or a roller, the resin may be transferred onto a transparent substrate by a transfer method or the like. Next, on at least one substrate surface,
The spacers are sprayed by a conventionally known method.

Then, the pair of substrates are overlapped so that the electrode forming surfaces face each other, and heated while pressing from both sides of the pair of substrates. Pressing and heating are performed, for example, as shown in FIG. 9, by placing a substrate 112 a on which a resin structure 115 is formed on a flat plate 150, stacking an opposing substrate 112 b, and heating the substrate 112 from the end by a heating / pressing roller 151. -It can be performed by passing between the roller 151 and the flat plate 150 while pressing. Using such a method,
A cell can be manufactured with high accuracy even using a flexible substrate having flexibility such as a film substrate. When the resin structure is formed from a thermoplastic polymer material, the resin structure is softened by heating and solidified by cooling, so that the two substrates can be bonded by the resin structure. When a thermosetting resin material is used as the sealing material, the sealing material may be cured by heating when the substrates are superposed.

In this superposition step, a liquid crystal material is dropped on one of the substrates, and the liquid crystal material is injected into the liquid crystal element simultaneously with the superposition of the substrates. In this case, the spacer may be included in the liquid crystal material in advance, and the spacer may be dropped on at least one of the substrates on which the strip-shaped electrode is formed.

The liquid crystal material can be filled in the whole area of the substrate by dropping the liquid crystal material on the edge of the substrate and spreading the liquid crystal material to the other end while overlapping the substrates with a roller. By doing so, it is possible to reduce the entrapment of bubbles generated when the substrates are overlapped with each other in the liquid crystal material.

Thereafter, the substrate is continuously pressed until the temperature of the substrate is lowered to at least the softening temperature of the resin material constituting the resin structure, the pressure is stopped, and a photo-curable resin material is used as a sealing material. If so, light irradiation is performed thereafter to cure the sealing material.

In the same procedure, the liquid crystal material is changed to a material having a different selective reflection wavelength, and cells for blue display, green display, and red display are manufactured. The cells thus manufactured are stacked in three layers, these are attached with an adhesive, and a light absorbing layer is further provided as a lowermost layer to obtain a full-color liquid crystal display device.

(Other Liquid Crystal Display Elements) In the liquid crystal display element 100, the element configuration in which the resin columnar structure is included in the liquid crystal display layer has been described. Such a structure can produce a light-weight liquid crystal display element having excellent display characteristics using a film substrate, and has various excellent features such as easy upsizing, relatively low driving voltage, and strong impact. Although it has and is particularly useful, it is not necessarily limited to this configuration, and a liquid crystal is dispersed in a conventionally known polymer three-dimensional network structure, or a polymer is contained in the liquid crystal. It is also possible to configure the liquid crystal display layer as a so-called polymer dispersed liquid crystal composite film having a three-dimensional network structure.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an information display device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a matrix drive circuit of a liquid crystal display element used as a display of the information display device.

FIG. 3 is an explanatory diagram of display coordinates.

FIG. 4 is an explanatory diagram of display control.

FIG. 5 is an explanatory diagram showing a display example on a display.

FIG. 6 is an explanatory diagram of a case where moving images are displayed in a plurality of areas.

FIG. 7 is a cross-sectional view illustrating an example of a liquid crystal display element used as a display.

FIG. 8 is a plan view showing a state in which a columnar structure and a sealing material are formed on a film substrate of the liquid crystal display element.

FIG. 9 is an explanatory view showing a manufacturing process of the liquid crystal display element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Information display apparatus 20 ... CPU 30 ... Control circuit 40 ... Video memory 100 ... Liquid crystal display element

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G09F 9/40 301 G09F 9/40 301 5C099 9/46 9/46 A G09G 3/20 660 G09G 3/20 660V 660B H04N 5/66 102 H04N 5/66 102B (72) Inventor Eiji Yamakawa 2-13-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka F-term in Osaka International Building Minolta Co., Ltd. 2H089 HA32 KA20 LA04 LA09 MA01X MA03X NA07 NA13 NA22 NA32. BB25 5C080 AA10 BB05 BB08 CC03 DD08 DD26 DD27 EE19 EE29 EE30 FF09 GG12 JJ02 JJ06 5C094 AA05 AA13 AA14 AA22 AA48 AA56 BA09 BA49 CA19 FA01 GA10

Claims (6)

[Claims] 1. A liquid crystal display element having a memory property in which a chiral nematic liquid crystal exhibiting a cholesteric phase at room temperature is interposed between a scanning electrode group and a signal electrode group, and the liquid crystal display element is driven in a matrix. An information display device for displaying an image, comprising: means for selecting an update start line and an update end line on a display screen, and displaying a moving image in an area between the start line and the end line. apparatus. 2. A liquid crystal display element having a memory property in which a chiral nematic liquid crystal exhibiting a cholesteric phase at room temperature is interposed between a scanning electrode group and a signal electrode group, and the liquid crystal display element is driven in a matrix. An information display device for displaying an image, wherein a display screen is divided into a plurality of display regions at least along scanning electrodes, and a moving image is displayed in at least one display region. 3. The information display device according to claim 1, wherein the information display device has a plurality of moving image display areas. 4. A liquid crystal display device comprising a plurality of liquid crystal layers stacked on each other, wherein said plurality of liquid crystal layers are simultaneously driven to display a moving image.
Information display device as described. 5. The information display device according to claim 1, wherein the entire screen is rewritten at a predetermined timing. 6. The moving image display area includes a number of scanning electrodes that does not exceed the upper limit of the number of scanning electrodes that can be observed as a moving image. The information display device according to claim 4 or 5.