JPS60131586A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device that is effective for displaying vehicle instruments using liquid crystals, and particularly for liquid crystal elements including liquid crystal cells filled with liquid crystals, set night i
≠Relates to a mounting structure of a lighting member □ material that irradiates light to the liquid crystal element side, and a □ substrate for driving a liquid crystal element provided in an illumination member arranger.

□In recent years, the display words of instruments for vehicles such as automobiles and motorcycles have been changed by changing the arrangement of the molecules of the 14' liquid crystal to control the transmission and non-transmission of light. A liquid crystal display device is used that displays predetermined characters and mathematical symbols depending on the shape. Examples of this type of liquid crystal display device include Utility Model Application No. 58-16680 and Utility Model Application Publication No. 58-58- 21115
There are No. ゛, No. 58-21116, etc. □. All of these liquid crystal display devices include a liquid crystal cell that contains liquid crystal sealed between two glass plates, a liquid crystal cell that contains a polarizing plate that is provided as necessary, and a liquid crystal cell that drives the liquid crystal using a signal voltage. An electrode provided with the liquid crystal cell, a light source provided behind the liquid crystal element, a circuit board provided behind the light source and for applying a signal voltage to the electrode, and a connection between the electrode and the circuit board. It includes conductive members and the like for electrical connection as components, and because there are many components, assembly is time-consuming and has poor workability.

In particular, care must be taken when arranging conductive members to maintain accurate and stable electrical connections between the electrode terminals of the liquid crystal cell and the terminals of the circuit board. However, when assembling, slight vibrations during work may cause the position to shift, resulting in the liquid crystal element not displaying or displaying incorrectly.To prevent such problems, great care must be taken when assembling. Therefore, the work did not progress and it was difficult to improve the workability.

The applicant of this application filed an application under the name "Liquid Crystal Display Device J" on May 31, 1980 (Patent Application No. 57-93379).
, proposed a liquid crystal display device that solved the above-mentioned conventional problems, but also succeeded in realizing a liquid crystal display device with a completely new mounting structure by making full use of technical methods.

゛ Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

4 is a vehicle town liquid crystal meter device having a liquid crystal display device 3 according to the present invention housed and fixed in a meter case 2;
Reference numeral 5 indicates a mask plate located in front of the liquid crystal display device 3 and formed from a colored polycarbonate resin plate or the like so as to cover unnecessary areas for display inside the meter case 2. Reference numeral 5 indicates a mask plate.

This is a front panel formed from a translucent acrylic resin plate or the like so as to close the front surface of the meter case 2 in front of the meter case 2, and display symbols such as letters and scales are printed on the rear surface.

The liquid crystal display device 3 includes a frame member 6. made of super heat-resistant ABS resin or the like to serve as a reference member for mounting its component parts. A liquid crystal element 9 is placed and fixed on the front surface of the frame member 6 by pressing at least its peripheral portion from the front by a cell presser 8, which is a presser member made of iron or the like, via a rubber gasket 7. A semi-transparent reflector plate 10 that is interposed between the liquid crystal element 9 and the frame member 6 and includes a filter element colored according to the display area of the liquid crystal element 9. This reflection, board 10? A heat shielding member 11 is interposed between the frame member 6 and formed of glass fiber, fiber-containing paper, etc., with a cutout portion corresponding to the display area of the liquid crystal element 9. The light is disposed within the frame of the frame member 6 and is formed from an acrylic resin plate or the like having a light intake portion on at least a portion of the side surface. The front and +q sides of the light guide member 12゜Φ light guide member 12! Point 0 that covers the front surface of the light guide 12 as well as covers the front surface of the light guide 12
? , a heat dissipation material 4ta formed from an aluminum plate or the like hanging down to the rear of at least a part of the part that covers the side surface of the liquid crystal element 99 shown in f7, and a light guide 1;
Reflector plate 14 provided on the rear surface of 2. It is fixed to the rear surface of the frame member 6 with screws, etc., and is used to apply a signal voltage to the liquid crystal element 9.
A first circuit board 16 is provided with a drive circuit 9 consisting of child parts 15, etc. An external bar (not shown) is fixed to this circuit board 16 with screws or the like via hard mounting leg members 17 made of iron or the like: Connector 1 connected to Noteri via a switch etc.
8 etc., the second droplet circuit board 19. Picture board 16. ．． ．． 4
．． Lead wires are added to both boards 16.9 for electrical connection. ．． 1
The lamp 21 is fixed to the mounting base member 7 with screws or the like so as to be located between 9 and 9, and the lamp 21 is arranged so that the light emitting part faces the light intake part 12a of the light guide 12, and is connected to an external battery (not shown) via a switch or the like. A third circuit board plate provided with a connector 22 etc. to be connected, and a through hole 6a provided in a frame portion of the frame member 6.
between the electrode terminals of the liquid crystal element 9 and the first circuit board 1
6 and a conductive rubber U, which is a conductive member, for electrically connecting predetermined terminals to each other.

The liquid crystal element 91 is connected to the liquid crystal cell δ and, if necessary, to the top of this liquid crystal! A polarizing plate attached to the front and rear surfaces of 26. , 27, and the liquid crystal cell 25 is 1. Characters to be displayed on the inner surface of the electrode substrate 4 between the front electrode substrates formed from a transparent insulating plate.

A first electrode 29 formed of a transparent conductive film so as to have a shape corresponding to numbers, scales, etc./Φ symbols. A rear electrode substrate 31 formed of a transparent insulating plate held at a constant distance from the front electrode substrate 4 via a spacer. Of this electrode substrate 31, a second electrode 329 is formed of a transparent □ conductive film or a reflective metal film so as to face the first electrode 29; ．． The terminal 34 is extended from the electrodes 29 and 32 and is formed on the rear surface of the front electrode substrate side so as to be exposed to the outside.

To explain the display operation of this liquid crystal element 9, for example, the liquid crystal 33 has positive dielectric anisotropy and the distribution of the center of gravity of the molecules is spatially random, but the long axes are aligned in one direction, and the electrode substrate 2
8.31 A P-type twisted nematic liquid crystal is used which is parallel to the electrode substrates 4 and 31 and whose axial direction is twisted by 90 degrees while going from one electrode substrate side to the other electrode/electrode substrate 31 due to inner surface alignment treatment, and a polarizing plate is used. 26.27 is attached to the electrodes 29.3 according to the signal voltage applied to the terminal 34 when the polarization axes that determine the polarized light to be transmitted are orthogonal to each other.
When a voltage higher than a predetermined level is not generated between the two, the liquid crystal 33 maintains its initial molecular alignment, and when the light that has been polarized in one direction by the rear polarizing plate 27 passes through the liquid crystal cell, the polarization changes. Since the polarization axis is twisted by 90 degrees and reaches the front polarizing plate 26, the polarization axis of the polarized light matches the direction of the polarization axis of the polarization plate, and the light can pass through the liquid crystal element 9, resulting in a non-display state in which the entire image appears bright. become. Further, when the signal voltage applied to the terminal 34 changes and a voltage of the predetermined level or more is generated between the predetermined overlapping portions of the electrodes 29.32, only the liquid crystal 33 between the portions of the electrodes 29.32 where the voltage is generated is generated. The long axes of the molecules are aligned perpendicularly to the electrode substrate 28 and 31 planes, and only in the portion of the liquid crystal 33 where the molecular arrangement has changed, light that is polarized in one direction by the rear polarizing plate 27 is transmitted through the liquid crystal cell 6. When the polarized light reaches the front polarizing plate 26 without being twisted, the polarizing axis of the polarized light and the direction of the polarizing axis of the polarizing plate 26 are perpendicular to each other and the light cannot pass through the liquid crystal element 9, resulting in bright light. "
A dark "figure" appears on the "ground" and the predetermined symbol is displayed in a positive state. Furthermore, in the above description, the case where light traveling from behind the liquid crystal element 9 is used is assumed, that is, the case where the liquid crystal element 9 is used as a transmissive type, but the liquid crystal element 9
Even when using light traveling from the front of the liquid crystal element 9, that is, when using the liquid crystal element 9 as a reflective type, the liquid crystal element 9
The principle is the same since the light from the front passes through the liquid crystal element 9 and then passes through the liquid crystal element 9 again behind the liquid crystal element 9. Furthermore, the polarization axes of both polarizers 27 are set in a parallel relationship. If you stick it so that it looks like this, a bright ``figure'' will appear on the dark ground, and the specified symbol will be displayed in a negative manner. In addition to the nematic liquid crystal having positive dielectric anisotropy, the liquid crystal may be used by adding cholesteric liquid crystal, an optically active substance, a dichroic dye, etc., if necessary. When the liquid crystal element 9 is constructed by arranging a plurality of so-called guest-host type liquid crystal cells to which a dye has been added in a stacked manner, the polarizing plates 26 and 27 can be omitted.

Next, the assembly work of the components will be explained.

A heat shielding member 11 is provided on the front surface of the frame member 6. The reflecting plate 10 is aligned and placed on it, and the liquid crystal element 9, which is composed of a liquid crystal cell 25 and a polarizing plate 5. A cell presser 8 is fixed to the frame member 6 by screws, hooks, etc., and is pressed against the frame member 6 by coming into contact with at least the peripheral edge portion of the liquid crystal element 9 from the front.

After that, the frame member 6 is turned over, and the conductive rubber 24 is placed in the through hole 6a'' provided in the frame portion of the frame member 6.
The terminal 34 of the liquid crystal cell is positioned toward the rear, and the front end of the conductive rubber 24 comes into contact with the terminal 34 of the liquid crystal cell. 5
・ ′ □ ″ Then, the light guide 12 arranged on the □ heat sink 13 is arranged inside the frame tube of the frame member 6 so that the heat sink 13 is on the □ front side, and the light guide 12 is placed on the rear surface of the light guide 12. In order to arrange 14.

□Next, the first circuit board 1 on which electronic components 15 etc. are mounted □
'The second circuit board 19 on which the eAb connector 18 is mounted and the liquid crystal element are also connected to the illumination bulb 21, connector 22, etc.
The attached third circuit base lines are respectively arranged on the mounting leg members 17, and the circuit board 16 is fixed to the bottom of the frame member d, but the terminals provided on the first circuit board 16 are in the through holes 6a. It is located facing forward, and the rear end of the conductive rubber U comes into contact with it.

The third assembly and installation of the liquid crystal display device is now completed, and the string is stored and fixed inside the meter case 2, and the meter case 2 is installed.
By attaching the front, flush, Yazuku plate 4 and front panel 5, the vehicle liquid crystal meter device l is completed. ' Thus, in this liquid crystal display device 3, as described above, the frame member 6 is used as a reference component during assembly work, and the other components, such as the heat shield plate 111, the reflector plate 10, are sequentially installed at the predetermined positions.
Liquid crystal element9. Heat sink 13. Light guide 12, reflection plate 14. By arranging the conductive rubber 24 together and attaching the cell presser 8 and the circuit board 16 to the frame member 6 from the front and rear, the components can be integrally fixed. If you arrange each component while paying attention to the positional relationship with respect to the Compared to the conventional structure, which is installed while checking the positional relationship with the component parts, the installation work is greatly simplified, and the operator's skill level is less than 1 hour. can significantly improve performance. In particular, a conductive rubber 24 that electrically connects the liquid crystal cell δ of the liquid crystal element 9 and the circuit board 16
The conductive rubber 24 can be positioned simply by inserting it into the through hole 6a provided in the frame member 6, and at the same time prevents the conductive rubber 24 from shifting or distorting. It is easy to center and has a structure that is resistant to external vibrations.

In addition, the thickness of the light guide 12 can be reduced compared to other conventional structures in which the light guide 1 is used as a reference component during work, and therefore the liquid crystal meter device 1 can be made thinner, making it suitable for vehicle instrument panels. Since only a small space is required, the light guide 12 can be easily mounted, and the shape of the light guide 12 can be made simple, which facilitates mold design and manufacturing. It has become possible to take a desired shape for averaging the illumination efficiency, which is the original mission of the light guide 12.

Moreover, since the thickness of the light guide 12 has become smaller,
Liquid crystal cell 5 and circuit board of liquid crystal element 9! Since the distance between the conductive rubber 24 and the conductive rubber 24 has also been reduced, and the longitudinal dimensions of the conductive rubber have also become smaller, the lateral deformation of the conductive rubber U when the conductive rubber 24 is attached has become smaller than before, and the terminals of the liquid crystal cell have been reduced. The pitch between the electrodes 29 and the terminals of the circuit board 16 facing the electrodes 29 and 4 can be narrowed, and the pitch of the electrodes 29 provided on the liquid crystal cell 4 can be reduced accordingly. , 32 are provided, and even if the liquid crystal cell device has the same area, many symbols are provided, so that the liquid crystal display device 3 can perform a wide variety of complex displays.

As described above, according to the present invention, the assembly of the component parts can be performed accurately and easily, the structure is strong against external vibrations, and the thickness of the light guide can be reduced, so that the overall thickness can be reduced. This also makes it easier to manufacture and change the light guide, and as the thickness of the light guide decreases, the pitch of the terminals can be reduced, thereby increasing the number of electrodes provided in the liquid crystal cell.1. This allows a wide variety of complex displays to be displayed, making it convenient for use in vehicles such as cars and motorcycles, where space is limited but there are many types of displays.

[Brief explanation of the drawing]

Figure 1 shows 1. A front view of the vehicle liquid crystal meter device, FIG. 2 is a cross-sectional view of essential parts of the same liquid crystal meter device, FIG. 3 is an exploded perspective view of the liquid crystal display device used in the same liquid crystal makeup device, and FIG. 4 is... A front view of the heat shielding member of the above liquid crystal display device, excluding the front components and conductive rubber. Figure 5 is a sectional view of the main parts of the same liquid crystal display device. Figure 6 is a main part of the same liquid crystal display device. FIG. 7 is a sectional view of a main part of a liquid crystal element used in the same liquid crystal display device as above. 1. Liquid crystal meter device for two wheels 3: Liquid crystal display device 6
: Frame member 8: Cell holder, 9: Liquid crystal element 10: Reflector plate 111 Heat shield member 12: Light guide 13; Heat sink 14; Reflector plate 16, 19.23: Circuit board/248 conductive rubber 25: Liquid crystal cell No. gil-,,゛. ,′−th′! Figure□□)■; □ ・il,, l,j,,,', ,, ,,,,,””
”,,:,:”l, , ,,, l,,,. ,−゛ ・ ・ ,′,゛,pa,. 00- Procedural Amendment Form April 3, 1982 1. Indication of the case 1988 Patent Application No. 240,272 2. Name of the invention Liquid crystal display device 3. Person making the amendment (shipment date March 1988) 27th) 5. Details subject to amendment 1 6. Engraving of the details of the amendment

Claims (1)

[Scope of Claims] A liquid crystal element that performs display by controlling light transmission by changing the arrangement direction of liquid crystal molecules by applying a signal voltage, a holding member that presses the liquid crystal element from the front side, and illumination of the liquid crystal element. a circuit board on which is installed a drive circuit that outputs a signal voltage for controlling the display of the liquid crystal element; and a conductive member that electrically connects the liquid crystal element to the circuit board; The assembly of the components includes at least a frame member that serves as a reference component when assembling the components, and the liquid crystal element is disposed on the front surface of the frame member, and the above-mentioned lighting is installed in the frame tube of the frame member. A circuit board 8 is disposed on the rear surface of the frame member.
and - fixing the holding member and the circuit board to the frame member so that the conductive part □ material is disposed in the through hole provided in the frame portion of the frame member. A liquid crystal display device featuring: −