JPH0980431A - Transmission display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the display visibility of a transmission liquid crystal display device, and also to enhance the performance of radiating heat from the lamp by the heat conductivity of a reflection plate by improving the assembling workability of a transmission display device in a narrow vehicle space, and also by enhancing the irradiation efficiency of the lamp by a metallic light reflection plate incorporated inside a case. SOLUTION: The reflection plate 13 formed of conductive material, and also constituted by combining a pair of reflecting members 13a which are divided into two and electrically insulated and separated is assembled in the device case 11, each one end of the reflection members is connected to the power supply circuit of the circuit substrate 12 installed in the case 11, and also, each the other end of the reflection members is connected to each electrical connection terminal 14b installed on a lamp socket holder 14a for holding the lamp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive display device using a transmissive liquid crystal display or the like. Specifically, a light source is arranged on the back side of the transmissive liquid crystal display and The present invention relates to a transmissive display device that transilluminates a transmissive liquid crystal display.

[0002]

2. Description of the Related Art For example, a clock display installed in an automobile is
As a conventional transmissive liquid crystal display device structure using a transmissive liquid crystal display, there is a structure as shown in FIG.

The structure of this conventional example will be described below.

Reference numeral 1 denotes a watch case, which has an opening 1a formed on the front surface thereof for fitting a circuit board, a finisher, etc., which will be described later, and the watch case 1 is provided at the back thereof. A lamp storage convex portion 1b described later is formed.

A circuit board 2 is provided inside the watch case 1.
Is provided with a plurality of ribs 1c for positioning the circuit board 2 when the circuit board 2 is fitted into the case, and the circuit board locking claws 1 are provided on both upper and lower wall surfaces 1d and 1e of the watch case 1.
f is formed. Further, a lock hole 1g for fixing the finisher is formed at the edge of the opening 1a of the watch case 1.

A socket penetrating locking hole 1i for mounting a lamp is formed in a projecting surface 1h of the lamp housing convex portion 1b.

Reference numeral 2 denotes a circuit board. The circuit board 2 is provided with a window hole 2a for transmitted light and a holder locking hole 2b for a holder, which will be described later, corresponding to the mounting device of the transmissive liquid crystal display. Further, on the surface of the circuit board 2, a driver 2c composed of an IC or the like for driving a transmissive liquid crystal display, a terminal portion 2d to which a rubber connector described later is contacted, and a fixed contact 2e corresponding to a rubber switch. Is provided.

A rubber connector 3 is connected to the terminal portion 2d, and the terminal portion 2d is connected to the terminal portion 4a of the transmissive liquid crystal display 4 for displaying the time via the rubber connector 3.

Reference numeral 5 denotes a rubber switch provided opposite to the fixed contact 2e, and this rubber switch 5 is provided with a knob 5a for time adjustment.

Reference numeral 6 is a filter located on the back surface of the transmissive liquid crystal display 4, and the filter 6 is a lamp 7
It has the role of diffusing the light from the light source and making it uniform. Since the filter 6 is arranged between the circuit board 2 and the transmissive liquid crystal display 4, the rubber contactor 3
An opening 6a for avoiding the above is provided.

The lamp 7 has a bayonet type socket holder 7a with a lead wire 7c and a wedge base type light bulb 7b attached thereto, and a connector 7d is connected to an end of the lead wire 7c. .

Reference numeral 8 denotes a holder in which the transmissive liquid crystal display 4, the filter 6 and the rubber connector 3 are incorporated. The holder 8 has an opening window 8b corresponding to the display portion of the transmissive liquid crystal display 4, and the opening window 8b. The holder 8 is attached to the locking hole 2 of the circuit board 2.
A claw portion 8a that is inserted into and locked in b is formed.

A lead wire 2f connected to the circuit board 2 is connected to the connector 7d.

The finisher 9 is formed of a transparent colored substrate, and the outer shape of the finisher is approximately the same size as the inner circumference of the opening 1a of the case 1. The area of the finisher 9 other than the display window 9a corresponding to the display portion of the liquid crystal display 4 is printed in black. Further, a through hole 9b is formed at a position corresponding to the mounting position of the knob 5a of the rubber switch 5, and a long side end face of the finisher 9 is provided for fixing the finisher formed on the wall surfaces 1e and 1d of the case 1. A rib 9c corresponding to the hole 1d is formed.

The procedure for assembling the transmissive display device using the above-mentioned components is as follows. First, the transmissive liquid crystal display 4 is attached to the holder 8.
And then the filter 6 and the rubber connector 3 are superposed on the back side of the transmissive liquid crystal display 4, and the claw portions 8a of the holder 8 are connected to the lead wires 2f in advance. It is locked in the stop hole 2b. Next, a rib (not shown) protrudingly provided on the back side of the rubber switch 5 is press-fitted and fixed in a locking hole (not shown) formed at a mounting position of the circuit board 2 to be formed on the circuit board 2. The contact 2e that is formed and the contact portion formed on the back surface of the rubber switch are arranged corresponding to each other to form a circuit board assembly.

Next, this circuit board assembly is fitted into the watch case 1 through the opening 1a of the watch case 1, and the circuit board 2 is inserted.
Of the inside of the watch case 1 by pressing the back surface of the circuit board 2 until it comes into contact with the respective ribs 1c and holding the upper and lower edges of the circuit board 2 by the circuit board engaging claws 1f formed on the upper and lower wall surfaces 1d and 1e of the watch case 1. Hold the circuit board assembly. At this time, it is connected to the circuit board 2. The lead wire 2f is the lead wire outlet 1 provided in the case 1.
g, then grommet 2 in drawer 1j
g.

Next, the ribs 9c formed on the edges of the finisher 9 are locked in the locking holes 1g formed in the opening 1a of the watch case 1. After that, the wedge base type light bulb 7b is fitted into the socket penetrating locking hole 1i formed on the back surface of the watch case 1, and the socket holder 7a to which the lead wire 7c connected to the connector 7d is connected is inserted. The transmission type display device is completed by fitting.

[0018]

In the conventional transmissive display device thus completed, the lead wire 2f connecting position to the circuit board 2 and the mounting position of the lamp 7 are separated from each other. It is necessary to route the respective lead wires 2f and 7c for supplying power to the circuit board 2 and the lamp 7, and further, a connector is attached to the other end of the lead wires and routed to the vehicle side. It has to be connected to a harness, which increases the manufacturing cost of the transmissive display device. Further, since the respective lead wires 2f and 7c are provided on the back side of the watch case 1, when the transmissive display device is to be assembled in an instrument panel of a car, which is a narrow space, for example, Those lead wires 2
There is a problem in that the work of mounting the device is hindered by the fact that f and 7c are caught by other objects.

The present invention has been made by paying attention to such a conventional problem. That is, in the present invention, the case of the transmissive display device is different from the conventional transmissive display device that includes a transmissive liquid crystal display device and a lamp for transmitting and illuminating the transmissive liquid crystal display device from the back side thereof. By omitting the use of the lead wire of a light bulb that is expended for wiring on the back side and providing a connection structure with a conductive light reflection plate in the case, the cost of the wiring structure is particularly reduced and the transmission type display device The first purpose is to improve the workability in assembling in a small vehicle space.

Further, according to the present invention, the light reflection plate enhances the irradiation efficiency of the lamp to improve the display visibility of the transmissive liquid crystal display, and the light reflection plate provides thermal conductivity to the lamp. The second purpose is to improve the heat dissipation of heat generation.

[0021]

In order to achieve each of the above objects, in the present invention, a transmissive liquid crystal display is provided in a case of a transmissive display device, and the transmissive liquid crystal display is provided from the back side of the transmissive liquid crystal display. In a transmissive display device equipped with a lamp for transmissively illuminating a liquid crystal display device, the transmissive display device is formed of a combination of a pair of reflective members 13a which are made of a conductive material and which are divided into two and electrically isolated. The reflecting plate 13 is incorporated into the case 11, one end of each of the reflecting members is connected to the power supply circuit of the circuit board 12 housed in the case 11, and the other end of each of the reflecting members is connected to the above. Lamp socket holder 14 for holding the lamp
It is characterized in that it is a transmissive display device connected to each of the electrical connection terminals 14b provided in a.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on the embodiments shown in FIGS. 1 to 7. In the present invention, the display device case 11, the circuit board 12, and the display device case 11 shown in FIG.
Since the structure of the reflector 13 and the lamp 14 has a feature, and the other structures are the same as the structure described in the conventional example, the same structures are denoted by the same reference numerals as those used in the description of the conventional example. The description of the same structure will be omitted.

First, the structure of the display device case 11 (hereinafter, simply referred to as a case) will be described.
1, an opening 11a for fitting the circuit board 12 and the finisher 9 and the like is formed on the front surface thereof, and a case convex portion 11b for housing the lamp 14 is formed at the back of the case 11. ing.

Further, inside the case 11, a plurality of ribs 11c for positioning the circuit board 12 when the circuit board 12 is fitted in the case are provided at the same height, and both upper and lower wall surfaces 11d of the case 11 are provided. , 11e,
A circuit board locking claw 11f is formed. Also 11s
Is a rib formed on the wall surface of the case in the same manner as the rib 11c, and the mounting of the circuit board 12 and the edge of the reflection plate 13 described later are extended along the wall surfaces 11d and 11e of the case, for example. In some cases, the pair of reflecting plates 13 is divided into two.
In order to prevent a short circuit due to the contact, the protrusion wall surface 1h of the case protrusion is continuously formed to the same height as the rib 11c. Further, a locking hole 11g for fixing the finisher is formed at the edge of the opening 11a of the case 11.

The projecting wall surface 11h of the case projection 11b is provided with a lamp socket penetrating locking hole 11i for fitting the lamp 14, and the lamp 14 is fitted around the locking hole 11i. A sliding surface 11j of a ridge is formed for fitting the socket holder 14a of No. 1 to the case 11 by a bayonet method. Further, a slit 11k for causing a part of the reflection plate 13 to project into the inside of the locking hole 11i is provided between the part of the projection forming the sliding surface and the projecting wall surface 11h. It is formed at a diametrically symmetrical position of 11i. Reference numeral 11m indicates a rib for positioning the reflector.

A connector 11n is integrally formed on the side portion of the case 11, and a plurality of connection terminals 1p are integrally inserted and held in the connector 11n by insert formation.

These connection terminals 1p are B for supplying driving power for driving the timepiece even when the engine is stopped, for example.
An AT terminal, an ACC terminal for illuminating the backlight of the liquid crystal display element when the ignition is in the accessory position and during engine operation, an ILL terminal for adjusting display brightness (illumination), and a GND terminal.

Next, the structure of the circuit board 12 will be described. In addition to the circuit board structure described in the conventional example, the circuit board 12 has a pair of left and right through holes for electrically connecting a reflector 13 described later. 12a are formed in the vicinity of both left and right edges of the window hole 12b, and lands for connecting to a power supply and a ground circuit are formed in both of these through holes 12a. Further, the case 11 is provided on one side of the circuit board.
A terminal insertion hole 12c is formed at a position corresponding to each connection terminal 11p provided therein. A land connected to a predetermined circuit of the circuit board 12 is also formed on the peripheral edge of the terminal insertion hole 12c.

Reference numeral 12d denotes a holder locking hole similar to that described in the conventional example, 12e denotes a driver, 12f denotes a terminal portion for contacting a rubber connector, and 12g denotes a fixed contact of a switch.

Next, the structure of the reflector 13 will be described. The reflecting plate 13 is configured by a combination of a pair of left and right reflecting members 13a.
a is a conductive material made of a tin-plated steel plate.
Although a tin-plated steel sheet is used in this embodiment, it is not particularly limited as long as it is a conductive material having good solderability and good reflection characteristics. These reflecting members 13a are arranged in the case convex portion 11b and efficiently guide the light of the lamp to the back surface of the transmissive display unit 4. As a shape, a partially curved surface 13b is formed. The curved surface 13b is formed as a parabolic surface centered around the filament portion of the lamp 14 when the lamp 14 is mounted in the case 11 and attached. One end of the curved surface 13b linearly extends to the back surface of the circuit board 12 along the inner wall surface of the case 11, and is provided on the circuit board 12 at the center of the extended end. A tongue piece 13c is formed to be inserted into the through hole 12a and to be electrically connected to the land provided in the through hole 12a. Also, the curved surface 13
The other end of b is directed along the side wall of the case 11 toward the projecting wall surface 11h, and is bent along the projecting wall surface 11h to form a tongue piece 13d for connecting to the lamp 14.

The tongue pieces 13d on both sides are the same as the case 11 described above.
Are inserted into the respective slits 11k provided in the lock holes 11i.
Exposed towards the center of the tongue 13d as a result
Each electrical connection terminal 1 formed on the surface of the flange portion 14d of the socket holder 14a of the lamp described later.
4f (2 places) are contacted. Further, in the above embodiment, the reflector is not extended until it extends along the wall surface of the case, but it is possible to increase the efficiency of the lamp light by making it along the wall surface of the case.
Needless to say.

The lamp 14 has a socket holder 14a of a type to which a lead wire is not attached, the socket holder 14a is of a bayonet type, and the socket holder 14a has a flange portion 14d toward the bulb mounting side. The claw portion 14e is formed, and the socket holder 1 thereof is further formed.
Electrical connection terminals 14f are provided in two places on the surface of the flange portion 14d of 4a so as to face each other in the diametrical direction. A wedge base type electric bulb 14g is attached to the socket holder 14a.

The components of the transmissive display device of this embodiment have been described above. Next, the assembly procedure will be described. First, in the case 11, a pair of reflecting members 13a constituting the reflecting plate 13 is formed on the rib 11m. Insert the tongue pieces 13d of the reflecting members 13a into the respective slits 11k provided in the case 11, and insert a part of both the tongue pieces 13d into the lamp socket penetrating locking hole 11i. Spend (expose) on.

Next, the circuit board 12 is fitted into the case. At the time of fitting, the connection terminal 11p fixed in the case 11 is inserted into the terminal insertion hole 12c provided in the circuit board 12, and Both reflective members 1
The tongue pieces 13c protruding from the front edge of 3a are inserted into the through holes 12a provided in the circuit board 12, and the penetrating ends of the connecting terminals 11p and the tongue pieces 13c are connected to Connect to the land by soldering. Next, the filter 6, the rubber connector 3, the transmissive liquid crystal display 4, the rubber switch 5, and the holder 8 are attached to the front surface of the circuit board 12 incorporated in the case.

Next, the socket holder 14a of the lamp 14 is inserted into the lamp socket penetrating locking hole 11i formed on the back surface of the case 11, and then the socket holder 14a.
By rotating the socket about 90 degrees by a bayonet method, the electrical connection terminal 14 formed on the socket holder 14a
b is electrically connected to the tongue piece 13d of the reflection member 13a.

Therefore, if the connector 15 of the harness arranged on the vehicle side is inserted into the connector 11n provided in the case 11 and power is supplied to the circuit board 12, the power is supplied to both sides. It is electrically connected to the electrical connection terminal 14b of the socket holder through the reflection member 13a, and thus the lamp 14 is supplied with power.

As described above, according to the present invention, the case 11 includes the reflection plate 13 formed of a combination of a pair of reflection members 13a which are made of a conductive material and which are divided into two parts and electrically insulated from each other. A lamp socket holder 14a for assembling the inside of the lamp, connecting one end of each of the reflecting members to the power supply circuit of the circuit board 12 housed in the case 11, and holding the other end of each of the reflecting members for holding the lamp. The electric power is supplied to the lamp from the electric power supply circuit of the circuit board 12 through the reflecting member because it is connected to each of the electric connection terminals 14f provided in the lamp. It is possible to reduce the cost of the transmissive display device by eliminating the use of a lead wire, and to eliminate the lead wire to make the space of the transmissive display device narrow. Workability is facilitated with a set.

Further, according to the present invention, since the conductive reflection plate is incorporated to enhance the irradiation efficiency of the lamp, the amount of light transmitted to the transmissive display is increased, which allows the display of the display by the transmitted light. Visibility is improved, and further, the heat conductivity of the conductive reflecting plate enhances the heat dissipation of the heat generated from the lamp.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a transmissive display device according to the present invention.

FIG. 2 is a plan sectional view of an embodiment of a transmissive display device according to the present invention.

FIG. 3 is a perspective view of a main part showing a lamp mounting portion of the embodiment of the transmissive display device according to the present invention.

FIG. 4 is a plan sectional view of the case of the embodiment of the transmissive display device according to the present invention.

FIG. 5 is a rear view of the case of the embodiment of the transmissive display device according to the present invention.

FIG. 6 is a cross-sectional view of a main part showing a lamp mounting structure of an embodiment of a transmissive display device according to the present invention.

FIG. 7 is a front view of an embodiment of a transmissive display device according to the present invention.

FIG. 8 is an exploded perspective view of a conventional transmissive display device. 11 ... Display device case 11a ... Opening portion 11b ... Case convex portion 11c ... Rib 11d ... Upper wall surface 11e ... Lower wall surface 11f ... Locking claw 11g ... Locking hole 11h ... Projected wall surface 11i ... Lamp socket through locking hole 11j ... Sliding Moving surface 11k ... Slit 11m ... Reflector positioning rib 11n ... Connector 11p ... Connection terminal 12 ... Circuit board 12a ... Through hole 12b ... Window hole 12c ... Terminal insertion hole 12d ... Locking hole 12e ... Driver 12f ... Terminal portion 12g ... Fixed contact 13 ... Reflector 13a ... Reflective member 13b ... Curved surface 13c ... Tongue 13d ... Tongue 14 ... Lamp 14a ... Socket holder 14b ... Electrical connection terminal 14d ... Flange 14e ... Claw 14f ... Electrical connection terminal 14g ... Wedge Base type light bulb 15 ... Connector

Claims (1)

[Claims] 1. A transmissive display device in which a transmissive display device and a lamp for transilluminating the transmissive display device from the back side of the transmissive display device are provided in a case of the transmissive display device, A reflection plate (13) formed of a combination of a pair of reflection members (13a) which is made of a conductive material and which is divided into two parts and electrically insulated and separated is incorporated into the case (11) to reflect them. A lamp socket holder (14a) for connecting one end of each of the members to a power supply circuit of a circuit board (12) provided in the case (11) and holding the other end of each of the reflecting members for holding the lamp. ) Is connected to each of the electric connection terminals (14f) provided in (1).