JP2986633B2 - Liquid crystal device and information transmission device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type liquid crystal device, and more particularly to a device suitable for use in a liquid crystal device using a ferroelectric liquid crystal.

[0002]

2. Description of the Related Art Conventionally, when a liquid crystal panel is fixed to a liquid crystal device, a load is applied to the liquid crystal panel, thereby distorting the liquid crystal panel and deteriorating the orientation of the liquid crystal, or causing shock or vibration applied to the liquid crystal device. There is a problem that the light is transmitted to the liquid crystal panel, the orientation of the liquid crystal is changed, and the image quality is deteriorated.
In particular, ferroelectric liquid crystals are liable to cause the above-mentioned problems, and a fixing method described below has been employed.

As shown in FIG. 7, an adhesive 5 is adhered to the periphery of an opening of a panel fixing plate 4, and a liquid crystal panel 1 is mounted thereon and adhered and fixed. The panel fixing plate 4 is attached to the peripheral circuit board 3 (driving means) of the driving IC and the driving IC by screws or the like.
Fix on top. Next, the panel fixing plate 4 is suspended in the opening of the fixing plate supporting member 7 via the elastic member 6, and the lower part and the upper part are made substantially closed structures. The elastic member 6 is formed by disposing the panel fixing plate 4 in an opening provided in the fixing plate support member 7, filling a rubber-based adhesive such as silicone rubber between them, and curing the adhesive. . Reference numeral 8 denotes a backlight unit as illumination of the liquid crystal panel 1.

Here, the reason why the lower part and the upper part of the liquid crystal panel 1 are sealed is described. FIG. 8 shows a configuration in which only the lower portion has a closed structure. When an impact such as a drop is applied to the liquid crystal device, the panel fixing plate 4 moves in the ± Z direction because it is supported by the elastic member 6 (see FIG. 8). At this time, since the lower part of the liquid crystal panel 1 has a closed structure, the air in the closed structure room cannot escape to the outside and is compressed. An air damper effect is obtained by the reaction force of the compression, and the impact applied to the liquid crystal panel 1 is reduced. Therefore, the deformation of the liquid crystal panel 1 can be suppressed, and the deterioration of the orientation and the image quality can be prevented.

[0005]

However, the liquid crystal device using the above fixing method has the following problems. (1) Since sufficient time is required for the elastic member 6 between the panel fixing frame 4 and the fixing plate supporting member 7 to cure, the liquid crystal panel 1, the TAB 2, the peripheral circuit board 3 must be placed and left for a long time. Therefore, it is necessary to manage the liquid crystal panel 1, the TAB 2, the peripheral circuit board 3 and the like 3 so as not to be damaged during the time required for curing, and the process management becomes troublesome. (2) As shown in FIG. 8, when an impact is applied to the liquid crystal device in the ± Z direction, the liquid crystal panel 1 also moves in the ± Z direction, and the elastic member 6 is deformed as shown in FIG. At this time, since the liquid crystal panel 1, the liquid crystal panel fixing plate 4, and the elastic member 6 are arranged on substantially the same plane, they are deformed in a bow shape.
This places a burden on the TAB 2, and the electrical connection between the TAB 2 and the peripheral circuit board 3 and between the TAB 2 and the electrode on the liquid crystal panel 1 may be disconnected. (3) If the rigidity of the members (the panel fixing plate 4 and the fixing plate supporting member 7) constituting the substantially closed structure is insufficient, the air inside the closed structure room compressed by the deformation of the liquid crystal panel 1 and the panel fixing plate 4. Due to the reaction force, the structural member may be deformed first, so that a sufficient effect of the air damper may not be obtained (see FIG. 9). Therefore, an object of the present invention is to provide a highly reliable liquid crystal device in which the manufacturing process management is simple and the electrical connection portion of the TAB is not disconnected, and an information transmission device using the same. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a panel fixing means for supporting a liquid crystal panel, a supporting means for supporting the panel fixing means,
A light unit for irradiating the liquid crystal panel with light, wherein the liquid crystal panel, the panel fixing means and the support means form a substantially closed space, and an impact applied to the liquid crystal panel is applied by an elastic force of the substantially closed space. In the liquid crystal device formed by absorption, the support means includes a fixed frame support for supporting the panel fixing means, a unit support for supporting the light unit at an outer peripheral portion of the fixed frame support, An elastic portion located between the fixed frame support portion and the unit support portion, and when an impact is applied to the liquid crystal panel,
The deformation of the elastic portion allows the elastic force of the atmosphere in the substantially closed space to function to make the displacement of the liquid crystal panel due to the impact equal to the displacement of the panel fixing means.

Further, the panel fixing means has an elastic member, the liquid crystal panel is attached to the elastic member, and the liquid crystal panel and the panel fixing means are in an up-and-down relationship. It absorbs the shock applied to the liquid crystal panel.

Further, the light unit is provided on the substantially closed space side of the unit support in order to reinforce the strength of the unit support.

Further, there is provided driving means for driving the liquid crystal panel, and the driving means is provided on the panel fixing means.

Also, as an information transmission device using the liquid crystal device according to the present invention, a graphic controller for outputting a data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, and a display. An information signal control circuit for outputting data and a scanning method signal, and a liquid crystal device according to the present invention, for displaying and displaying information.
It is characterized by being transmitted.

[0011]

According to the above construction, when assembling the liquid crystal device, the liquid crystal panel and the panel fixing frame are bonded with an elastic member,
Further, by bonding the fixed frame support portion and the unit support portion via the elastic portion, these two bonding processes are separate processes.
In addition, the light unit is disposed in the unit support portion substantially on the closed space side, and the strength of the unit support portion is increased.

[0012]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a liquid crystal device according to one embodiment of the present invention. The liquid crystal device 50 has a device housing 19, a liquid crystal panel 1, and a side light unit 20 (light unit). The liquid crystal panel 1 and the sidelight unit 20 are housed inside the device housing 19, and the liquid crystal panel 1 is attached to the panel fixing frame 14 (panel fixing means) by a rubber-based adhesive 5 (elastic member). This panel fixing frame 1
4 is attached to a fixed frame support member 15 (fixed frame support portion) via an elastic member 18 (elastic portion) such as silicon-rubber, so that the panel fixed frame 14 is suspended with respect to the fixed frame support member 15. , A substantially closed space 30 is formed.
In addition, the side light unit 20 includes the fixed frame support member 15.
It is arranged above. Further, a peripheral circuit board 3 having a drive IC for driving the liquid crystal panel 1 is fixed to the panel fixing frame 14 with screws or the like, and connected to the liquid crystal panel by a flexible printed wiring film (hereinafter abbreviated as TAB) 2. ing. As shown in FIG. 5, it is also possible to adopt a structure in which the panel fixing frame 14 is supported and fixed while the peripheral circuit board 3 is bent at a right angle. The reason why the substantially enclosed space 30 is provided is to alleviate the impact applied to the liquid crystal device 50 and the like. That is, as shown in FIG. 4, when an impact such as a drop is applied to the liquid crystal device 50 in the −Z direction in the figure, the panel fixing frame 14 moves in the −Z direction because it is supported by the elastic member 18. try to. However, since this means that the volume of the substantially closed space 30 is compressed, the air damper effect works due to the elasticity of the air, so that the impact on the liquid crystal panel 1 is reduced, and the impact on the liquid crystal panel 1 is reduced. Deformation is small, and it is possible to prevent orientation, image quality deterioration, and the like.

The structure of the side light unit 20 will be described with reference to FIGS. A colorless light guide 24 having a large thickness as a light guide, a tubular light source 22 (such as a cold cathode tube) on each side, and a reflector 23 are arranged around the light source 22 inside the unit housing 21. Have been. Then, the light emitted from the tubular light source 22 is guided into the light guide 24 by the reflector 23 disposed around the tubular light source 22, and the light that has traveled inside the light guide 24 is disposed on the lower surface of the light guide 24. The light is reflected upward by the reflecting sheet 25 and is emitted from the light diffusion sheet 27 to the outside. When the diffusion pattern 26 formed on the lower surface of the light guide 24 by printing or the like has a large distance from the light source, the interval between the diffusion patterns 26 is small.
The portion where the distance is small is roughened, and the light diffusion sheet 27 is overlaid on the upper surface of the light guide 24 so that the light amount distribution on the upper surface of the light guide 24 becomes substantially uniform. .

Next, an assembling procedure of the present invention will be described. First, the liquid crystal panel 1 and the circuit board 3 of the driving IC are fixed to the panel fixing frame 14 by bonding and screwing. After that, the unit support member 17 (unit support portion) is arranged on the same plane in the opening of the fixed frame support member 15, and between the inside of the opening and the end face of the unit support member 17.
After curing, a rubber-based adhesive (silicone rubber or the like) showing elasticity is filled and left for a long time to adhere. Finally, the panel fixing frame 14 and the fixing frame supporting member 15 are
Fix with 6. Since the panel fixing frame 14 and the fixing frame supporting member 15 have a structure that can be divided, the panel fixing frame 14 can be handled separately while the adhesive is cured to generate the elastic member 18. Therefore, the liquid crystal panel 1 on the panel fixing frame 14 is not left for a long time, and the process management is simplified.

Next, a case where an impact is applied to the liquid crystal panel 1 by dropping the liquid crystal device 50 or the like will be described with reference to FIG. First, the liquid crystal panel 1 and the panel fixing frame 1
4, the elastic member 18 is deformed and the liquid crystal panel 1 moves in the ± Z direction in FIG. LCD panel 1
Since the substantially closed space 30 below has a substantially closed structure as described above, the air confined in the substantially closed space 30 is compressed by the movement of the liquid crystal panel 1 and the panel fixing frame 14. Further, since the panel fixing frame 14 is box-shaped and the unit support member 17 is integrated with the side light unit 20 having high rigidity, the rigidity of the members forming the substantially closed space 24 is high. Therefore, the deformation of the structural member due to the reaction force of the compressed air is small, and a sufficient effect of the air damper can be obtained, so that the shock applied to the liquid crystal panel 1 is reduced, and the deformation can be prevented.

Liquid crystal panel 1, TAB2, driving IC
The panel fixing frame 14 to which the peripheral circuit board 3 is supported and fixed has a box-shaped structure as described above, so that the amount of bending is smaller than that of the conventional panel fixing frame, The stress on the electrical connection between the panel 1 and the TAB 2 and between the TAB 2 and the peripheral circuit board 3 of the driving IC is reduced.

In the above description, the ferroelectric liquid crystal has a feature that the orientation is likely to be degraded when the liquid crystal panel 1 is impacted. It is also effective when supporting a liquid crystal panel using (nematic liquid crystal, etc.) and does not depend on the type of liquid crystal material. The type of the light source 22 and the material of the light guide 24 of the side light unit 20 used as the illumination system of the liquid crystal panel 1 are arranged so as to sandwich the liquid crystal panel 1, and the mounting positions of the lower polarizing plates 11 and 12 are provided. This is not always the case.

Next, an embodiment of an information transmission device using the liquid crystal device according to the present invention will be described. FIG. 6 shows a block diagram of the information transmission device. The information transmission device JD includes a graphic controller x20, a drive control circuit x21, a scan signal control circuit x22, an information signal control circuit x23, and a scan signal application circuit x24. , An information signal applying circuit x25, and a liquid crystal device x26 according to the present invention.

The data and the scanning method signal output from the graphic controller x20 are output to the scanning signal control circuit x22 and the information signal control circuit x23 by the drive control circuit x21. At this time, the data is converted into address data and display data, and the scanning method signal is sent to the scanning signal applying circuit x24 and the information signal applying circuit x25 as they are. The scanning signal applying circuit x24 outputs a scanning signal waveform determined by the scanning method signal to a scanning electrode (not shown) determined by the address data.
Outputs an information signal waveform determined by two of a scanning method signal and white or black display content sent by display data to an information electrode (not shown), and displays information on the liquid crystal device x26.

By using the liquid crystal device of the present invention,
The reliability of the information transmission device can be improved.

[0021]

As described above, the liquid crystal panel is fixed to the panel fixing frame with an adhesive exhibiting elasticity, and the fixing frame supporting member and the unit supporting member are adhered to each other with the elastic member. Since the fixed frame support member can be attached with screws or the like, the process management becomes easy.

Further, since the liquid crystal panel and the panel fixing frame are bonded in a vertical relationship, disconnection such as TAB is reduced, and the reliability of the liquid crystal device is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal device applied to an embodiment of the present invention.

FIG. 2 is a sectional view of a sidelight unit applied to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a sidelight unit applied to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of the liquid crystal device when subjected to an impact applied to the embodiment of the present invention.

FIG. 5 is a sectional view of a liquid crystal device applied to an embodiment of the present invention.

FIG. 6 is a block diagram of an information transmission device using the liquid crystal device according to the present invention.

FIG. 7 is a cross-sectional view of a liquid crystal device applied to description of a conventional technique.

FIG. 8 is a cross-sectional view of a liquid crystal device when subjected to an impact applied to the description of the related art.

FIG. 9 is a cross-sectional view of a liquid crystal device when subjected to an impact applied to the description of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Printed wiring film (drive means) 3 Peripheral circuit board (drive means) 4 Panel fixing frame (panel fixing means) 5 Adhesive (elastic member) 15 Fixed frame support member (fixed frame support part) 17 Unit support member (Unit support part) 18 Elastic member (elastic part) 20 Side light unit (light unit) 30 Substantially closed space

Continued on the front page (72) Masanori Takahashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Naoo Tajima 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroshi Takabayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-4-67017 (JP, A) JP-A-4-214528 (JP, A) JP-A-3-203773 (JP, A) JP-A-3-241318 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02F 1/1333 G09F 9/00 303

Claims (5)

(57) [Claims] 1. A liquid crystal panel, comprising: a panel fixing means for supporting a liquid crystal panel; a supporting means for supporting the panel fixing means; and a light unit for irradiating the liquid crystal panel with light. In a liquid crystal device, wherein the support means forms a substantially closed space and absorbs an impact applied to the liquid crystal panel by the elastic force of the substantially closed space, wherein the support means supports the panel fixing means. And a unit support portion that is located on an outer peripheral portion of the fixed frame support portion and supports the light unit; and an elastic portion that is located between the fixed frame support portion and the unit support portion. When an impact is applied to the liquid crystal panel, the elastic portion is deformed so that the elastic force of the atmosphere in the substantially enclosed space functions, and the displacement of the liquid crystal panel due to the impact causes the panel fixing hand to move. Formed by equal displacement, the liquid crystal device, characterized in that. 2. The panel fixing means has an elastic member, the liquid crystal panel is attached to the elastic member, and the liquid crystal panel and the panel fixing means are in an up-down relationship, and the elastic member is The liquid crystal device according to claim 1, wherein the liquid crystal device is configured to absorb a shock applied to the liquid crystal panel. 3. The liquid crystal device according to claim 1, wherein the light unit is disposed on the substantially closed space side of the unit support in order to reinforce the strength of the unit support. 4. The liquid crystal device according to claim 1, further comprising driving means for driving the liquid crystal panel, wherein the driving means is provided on the panel fixing means. 5. A graphic controller that outputs a data signal and a scanning method signal, a scanning signal control circuit that outputs scanning line address data and a scanning method signal, an information signal control circuit that outputs display data and a scanning method signal, An information transmission device comprising: the liquid crystal device according to claim 1; and displaying and transmitting information.