JP3141238B2 - Display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a display device such as a viewfinder or a projector.

2. Description of the Related Art Conventionally, a viewfinder of a video camera displays an image captured based on a video signal transmitted from a video camera body having a built-in CCD (solid-state imaging device) or video tape. CRT displays were used as a means. However, a viewfinder using a CRT display has a problem that the weight is heavy, the whole device is large, and it is inconvenient to carry a video camera.

Therefore, recently, a viewfinder using a lightweight and compact liquid crystal display panel has been considered as a display means of the viewfinder. This liquid crystal display panel has a matrix in which transparent signal electrodes and scanning electrodes are opposed to a pair of transparent glass substrates in a matrix shape, and a liquid crystal material is sealed between the electrodes. When driven by a chip, an image captured based on a video signal from a video camera body is displayed. An eyepiece for enlarging and displaying a displayed image is provided in front of the liquid crystal display panel, and a backlight for illuminating the back side of the liquid crystal display panel is provided behind.

[Problems to be Solved by the Invention] However, in a viewfinder using a liquid crystal display panel, electronic components such as a driver IC chip and the like are arranged on an optical path of an eyepiece, a liquid crystal display panel, and a backlight. Can not. Therefore, in the liquid crystal display panel, the outer periphery of each glass substrate is formed larger than the display area, a wiring pattern for connection is formed on the outer periphery of the display area, and a driver IC chip is bonded to the wiring pattern.・ Glass method is adopted. However, in this method, the outer periphery of the liquid crystal display panel becomes large,
There is a problem that the cross-sectional area of the viewfinder is inevitably increased, and the entire device is enlarged. Such a problem also occurs in a projector using a liquid crystal display panel.

An object of the present invention is to provide a display device in which an electronic component such as an IC chip does not obstruct an optical path, the outer periphery of a display panel can be reduced, and the entire device can be reduced in size and weight.

Means for Solving the Problems In order to achieve the above-described object, the present invention provides a display device in which a magnifying lens, a display panel, and a light source are arranged in a cylindrical device main body having a light-shielding portion at one end. The display panel provided with the scanning electrode terminals and the signal electrode terminals on adjacent sides is held by a tubular holder provided on the display surface side of the display panel, and extends in a direction orthogonal to the longitudinal direction of the apparatus body. The cylindrical holder is disposed, corresponding to the display area of the display panel, has an opening along a longitudinal direction of the device main body, and an insulating film on which an IC chip is mounted is respectively provided on the inner surface of the device main body and the cylindrical mold. A wiring lead, which is disposed along the longitudinal direction of the device main body between the outer surface of the holder and the IC chip connected to the insulating film and connected to the IC chip, forms a right angle near the side end of the display panel. direction By bending, it is obtained by connecting the end portions of the wires leads to each scan electrode terminal or the signal electrode terminals of the display panel.

[Operation] The operation of the present invention is as follows.

Wiring leads to which the IC chip is connected are formed on the insulating film, and these wiring leads are bent at right angles in the vicinity of the side edges of the display panel, and the ends of each wiring lead are provided on the sides of the display panel. Connected to the scanning electrode terminal or the signal electrode terminal, respectively, so that the insulating film on which the IC chip is mounted is arranged between the device body and the side edge of the display panel and along the longitudinal direction of the device body. . Therefore, without obstructing the optical path of the magnifying lens, display panel and light source,
Electronic components such as IC chips can be arranged. In addition, since the display panel only needs to arrange the scanning electrode terminals and the signal electrode terminals at the side end portions, the outer periphery of the display panel can be formed small, whereby the size and weight of the entire display device can be reduced.

Embodiment An embodiment in which the present invention is applied to a view finder of a video camera will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows the overall configuration of the viewfinder. 1 in the figure
Is a fin body. The finder body 1 is formed in a cylindrical shape, and has an opening 2 at the left end. The lens barrel 3 is provided in the opening 2 so as to protrude from the inside of the finder body 1 to the outside. A magnifying lens 4 is provided in the lens barrel 3, and an eyepiece (light transmitting part) 5 is provided at an outer end thereof. Further, a display section structure 6 and a backlight 7 are provided inside the finder body 1.
The display section structure 6, the backlight 7, and the magnifying lens 4 are arranged on the optical axis. The backlight 7
Is provided with a light source 9 such as a fluorescent tube in a light case 8 and a diffusion plate 10 on the display unit structure 6 side. The structure irradiates the panel 11.

2 and 3 show the structure of the display unit structure 6. FIG.
The display unit 6 includes a liquid crystal display panel 11, a liquid crystal cell 12, a cylindrical holder 13, a circuit board 14, an IC unit 15 for scanning electrodes, IC units 16 and 17 for signal electrodes, and first and second connections. It is composed of wiring boards 18 and 19 for use.

The liquid crystal display panel 11 is for displaying information such as images in color, and transparent scanning electrodes and transparent signal electrodes are provided on the opposing surfaces of a pair of upper and lower glass substrates 20 and 21 so as to oppose each other in a matrix form. A pair of glass substrates 20,
Liquid crystal material is sealed between 21 and the torsion angle of this liquid crystal material is 150 to 2
It has a TN type structure that is enlarged to about 70 degrees. In the liquid crystal display panel 11, a crossing portion where the scanning electrode and the signal electrode face each other becomes a pixel, and a color filter of red, green, and blue dyes is arranged to face each pixel. In this case, one end of the upper glass substrate 20 protrudes laterally from the lower glass substrate 21, and the scanning electrode terminals 22 are arranged at the protruding portions. Further, the lower glass substrate 21 has side edges adjacent to one protruding end of the upper glass substrate 20 protruding sideways from the upper glass substrate 20, and the protruding both ends are provided with signal electrode terminals 23. , 23 are arranged. In addition,
The liquid crystal cell 12 is for compensating for the phase difference (color) of light caused by the wavelength dependence due to the birefringence of the liquid crystal material of the liquid crystal display panel 11, and the liquid crystal display is the same except that the transparent electrodes and the color filters are removed. It has the same structure as panel 11.

The cylindrical holder 13 is for holding the liquid crystal display panel 11 and the liquid crystal cell 12, and is formed in a square cylindrical shape,
An opening 13a is formed corresponding to the display area of the liquid crystal display panel 11. At the upper end of the cylindrical holder 13, a frame-shaped support portion 24 for supporting the liquid crystal display panel 11 and the liquid crystal cell 12 in a stacked state is provided. Engagement hooks 25 are provided at four corners of one outer surface of the cylindrical holder 13, respectively.

The circuit board 14 is a hard board made of epoxy resin or the like, on which a wiring pattern (not shown) is formed, a control IC chip 26 is mounted, and the connection terminals 27 and 28 are vertically It is provided in two rows. Circuit board
A solder resist is applied to all surfaces except the connection terminals 27 and 28 of the fourteenth embodiment. Locking grooves 29 are provided on both side edges of the circuit board 14.
The engagement hook of the cylindrical holder 13 is
The cylindrical holder 13 is attached so that 25 is detachably engaged. The circuit board 14 is connected to a video camera via a lead wire (not shown), and a video signal is supplied from the video camera.

The IC units 15 to 17 drive the liquid crystal display panel 11, and the scanning electrode IC unit 15 is
Of the scanning electrode terminal 22 and the signal electrode IC unit 1
Reference numerals 6 and 17 are connected to the signal electrode terminals 23 and 23 of the liquid crystal display panel 11, respectively, by a suitable bonding means such as a conductive adhesive or soldering. Here, the conductive adhesive is a dispersion of conductive particles or fine particles whose outer surfaces are covered with an insulating film in a hot-melt type insulating adhesive, and conducts electrical conduction in a thickness direction of the adhesive in a bonded state. Say what brings. Each IC
The units 15 to 17 are of the TAB type, and are formed by patterning wiring leads 31 on the insulating film 30 for driving.
It has a structure in which a plurality of IC chips 32 (two in the figure, but may be one, or three or more) may be mounted. In this case, each wiring lead 31 is provided to protrude from the upper and lower ends of the insulating film 30, the upper outer end 33a is connected to each of the electrode terminals 22 and 23 of the liquid crystal display panel 11, and the lower outer end 33b is They are connected to connection wiring boards 18 and 19 described later. In addition, the insulating film 30 of each of the IC units 15 to 17 includes:
A slit 30 is provided at one end on the side connected to the liquid crystal display panel 11.
a is provided to facilitate bending of a wiring lead 31 described later. What is important here is the upper outer end 33 of the wiring lead 31.
When a is connected to each of the electrode terminals 22 and 23 of the liquid crystal display panel 11, the wiring leads 31 are bent at right angles in the vicinity of the side ends of the liquid crystal display panel 11, and the IC units 15 to 17 are attached to the outer surface of the cylindrical holder 13. To be connected in a state where they are arranged in the same manner. This means that when the display unit structure 6 is disposed in the finder main body 1, each of the IC units 15 to 17 is positioned between the outer end of the liquid crystal display panel 11 and the inner surface of the finder main body 1, and Are arranged along the longitudinal direction of the
Therefore, each IC unit 15-17 equipped with the IC chip 32
Are arranged without obstructing the optical paths of the magnifying lens 4, the display unit structure 6, and the backlight 7, as shown in FIG.

The connection wiring boards 18 and 19 are for connecting the IC units 15 to 17 to the circuit board 14, and the first connection wiring boards 18 connect the scanning electrode IC units 15 to the circuit board 14. The second connection wiring board 19 is an IC unit for signal electrodes.
16 and 17 are connected to the circuit board 14. That is, each of the connection wiring boards 18 and 19 is formed by covering the wiring pattern 35 with a solder resist on the surface of a substantially strip-shaped flexible insulating film 34, and the board-side terminals 36 and the unit-side terminals 37 and 38 are provided at predetermined locations. , 39 are provided. In this case, the first connection wiring board 18 has a unit-side terminal 37 provided at a lower end on one end side, a lower end protruding downward, and a board-side terminal 36 provided at the protruding lower part. The first connection wiring board 18 is bent in a U-shape, and one end is disposed between the cylindrical holder 13 and the IC unit 15 so that the unit side terminal 37 is located below the wiring lead 31 of the IC unit 15. Is connected to the outer side end 33b by soldering or the like, and the middle is the cylindrical holder 1
3 and the IC unit 16 and the other end is a cylindrical holder 1
The board-side terminal 36 is disposed between the circuit board 3 and the circuit board 14 and connected to the connection terminal section 28 on the lower side of the circuit board 14 by soldering or the like. The second connection wiring board 19 has unit-side terminals 38 and 39 at the lower portions on both ends, a middle portion protrudes upward, and a board-side terminal 36 is provided at the protruding upper portion. The second connection wiring board 19 is also bent in a “U” shape, and both ends are disposed between the cylindrical holder 13 and the IC units 16 and 17, and the unit-side terminals 38 and 39 are connected to the IC unit 16.
17 is connected to the lower outer end 33b of the wiring lead 31 by soldering or the like, the middle is disposed between the cylindrical holder 13 and the circuit board 14, and the board-side terminal 36 is connected to the upper connection terminal of the circuit board 14. 27
Are connected by soldering or the like. Although not shown, a plurality of chip components are mounted on the connection wiring boards 18 and 19.

As described above, according to the viewfinder described above, the IC units 15 to 17 connected to the circuit board 14 by the first and second connection wiring boards 18 and 19 are connected to the liquid crystal display held by the cylindrical holder 13. When connecting to the electrode terminals 22 and 23 of the panel 11, the outer ends 33a of the wiring leads 31 of the IC units 15 to 17 are bent at right angles, and the IC units 15 to 17 are attached to the cylindrical holder.
13, the connection is made in a state of being arranged on the outer surface of the LCD 13, so that when the display unit constituting body 6 is arranged in the finder main body 1, each of the IC units 15 to 17 It will be arranged between them. Therefore, electronic components such as the driving IC chip 32 can be arranged without obstructing the optical paths of the magnifying lens 4, the liquid crystal display panel 11, and the backlight 7. In addition, since the liquid crystal display panel 11 only needs to provide the scanning electrode terminals 22 or the signal electrode terminals 23 on the outer peripheral side of the display area, the outer shape of the liquid crystal display panel 11 can be made small, thereby reducing the size of the entire viewfinder. Weight and weight can be reduced.

The present invention is not limited to the embodiment described above. For example, the number of connection wiring boards need not be two, but may be three, or may be one as shown in FIG. That is, when the number of the connection wiring boards 40 is one, the scan electrode unit side terminals 42 are provided at predetermined positions on the lower side in the longitudinal direction of the substantially strip-shaped flexible insulating film 41.
Are provided on both sides thereof, and unit side terminals 43 and 43 for signal electrodes are provided.
And the board side terminal 44 is provided on one side (the left side in the figure) of the unit side terminals 43, 43. When each of the IC units 15 to 17 is connected to the circuit board by the connection wiring board 40, for example, a unit side terminal 42 for a scan electrode is used.
Is connected to the lower outer end 33b of the wiring lead 31 of the scanning electrode IC unit 15, and both sides thereof are bent at right angles at the positions indicated by the two-dot chain lines A, A, so that each unit side terminal 4 for the signal electrode is formed.
3 and 43 are the wiring leads 3 of each IC unit 16 and 17 for signal electrodes
After connecting to the lower outer end portion 33b, one end side may be bent at a right angle at a position indicated by a two-dot chain line B to connect the board-side terminal 44 to the connection terminal portion of the circuit board.

The slits 30a are formed in the insulating film 30 of each of the IC units 15 to 17 to facilitate bending of the wiring leads 31, but the slits 30a are not always necessary.

The liquid crystal display panel has a twist angle of 150 to 270 for the liquid crystal material.
It does not need to be a degree, and may be a 90 degree TN type. What compensates for the phase difference (color) of the liquid crystal display panel is
Not limited to the liquid crystal cell 12, a phase plate (wavelength plate) or the like may be used, and the liquid crystal material of the liquid crystal display panel is not necessarily required to be provided with a TN type having a twist angle of 90 degrees.

Further, the present invention can be applied not only to the above-described viewfinder, but also to a display device such as a liquid crystal projector. In this case, a magnifying projection lens is arranged in the eyepiece 5.

[Effects of the Invention] As described in detail above, according to the present invention, a wiring lead to which an IC chip is connected is formed on an insulating film,
The wiring leads are bent at right angles in the vicinity of the side edges of the display panel, and the ends of the wiring leads are connected to the scanning electrode terminals or the signal electrode terminals of the display panel, respectively, and the insulating chip on which the IC chip is mounted is mounted. The film, between the outer surface of the cylindrical holder supporting the display panel and the inner surface of the device body,
Since it is arranged along the longitudinal direction of the device main body, electronic components such as an IC chip can be arranged without obstructing the optical paths of the magnifying lens, the display panel and the light source body, and the display surface side of the display panel can be arranged. The provision of the cylindrical holder makes it easier to see the display.
In addition, since the display panel only needs to arrange the scanning electrode terminals and the signal electrode terminals at the side end portions, the outer periphery of the display panel can be formed small, whereby the size and weight of the entire display device can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the entire configuration of a viewfinder to which the present invention is applied, FIG. 2 is a perspective view showing a display unit structure,
FIG. 3 is an exploded perspective view, and FIG. 4 is a developed view showing a modification of the connection wiring board. DESCRIPTION OF SYMBOLS 1 ... Finder main body, 4 ... magnifying lens, 5 ... eyepiece part (light transmission part), 6 ... display part structure, 7 ... backlight (light source body), 11 ... liquid crystal display panel, 15 ~ 17 ... IC unit, 22 ... Scan electrode terminal, 23 ... Signal electrode terminal, 30
…… Insulating film, 31… Wiring lead, 32… IC chip, 33a …… Outer end.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-60-208734 (JP, A) JP-A-1-13582 (JP, A) JP-A-1-187590 (JP, A) JP-A-1- 234828 (JP, A) JP-A-1-234829 (JP, A) JP-A-1-241159 (JP, A) JP-A-63-68694 (JP, U) JP-A-1-13026 (JP, U) Japanese Utility Model Application Hei 1-88981 (JP, U) Japanese Utility Model Application Hei 1-113270 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 9/00 G02F 1 / 1343,1 / 1345 G02F 1 / 135,1 / 136 G02F 1 / 1365,1 / 1368 H04N 5/222-5/257 G03B 13/00-13/28

Claims (1)

(57) [Claims] 1. A display device in which a magnifying lens, a display panel, and a light source are disposed in a cylindrical device main body having a light-shielding portion at one end, wherein a scanning electrode terminal and a signal electrode terminal are provided on adjacent side portions. The display panel is held by a tubular holder provided on the display surface side of the display panel, and is disposed in a direction orthogonal to a longitudinal direction of the apparatus main body. The tubular holder is disposed in a display area of the display panel. Corresponding openings are provided along the longitudinal direction of the device main body, and an insulating film on which an IC chip is mounted is provided between the inner surface of the device main body and the outer surface of the cylindrical holder in the longitudinal direction of the device main body. And the wiring leads attached to the insulating film and connected to the IC chip are bent in a direction perpendicular to the vicinity of the side end of the display panel, and the ends of the respective wiring leads are respectively bent. The display panel Display apparatus characterized by the connected to the scan electrode terminal or the signal electrode terminal.