JP2005024751A - Electronic device, liquid crystal display, and input/output joining method of electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain miniaturization of an electronic device by integrating a flexible printed board for input/output of an LCD unit and at least a flexible printed board for input/output of a backlight unit with each other. <P>SOLUTION: At least the flexible printed board 40 for input/output of the backlight unit 26 is joined to a joining part 38b provided at the flexible printed board 38a for input/output of the LCD unit 7 and the joining part 38b is provided in an inclined space 49 of a wedge-shaped light guide plate 42. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic device having a liquid crystal display device, a liquid crystal display device, and an input / output joining method for the electronic device.
[0002]
[Prior art]
Conventionally, a touch panel made of a transparent conductive film or the like that detects the position touched with a fingertip or a pen tip is provided on a panel surface of a liquid crystal display device such as an electronic device for a computer, and information items displayed on the display device are displayed. A touch panel that enables selection of this information item by touching is disclosed in Patent Document 1.
[0003]
Patent Document 2 discloses a backlight having a configuration in which the cross-sectional shape of a synthetic resin light guide plate is a substantially parallel plate shape as an edge light type backlight used in a liquid crystal display device.
[0004]
[Patent Document 1]
JP 2002-99389 A (FIG. 1, paragraph number 0001)
[Patent Document 2]
JP 2002-231034 A (Fig. 1, paragraph number 0020)
[0005]
[Problems to be solved by the invention]
Conventionally, in electronic devices and liquid crystal display devices using a liquid crystal display device, a touch panel unit made of a transparent conductive film as shown in Patent Document 1 is arranged on the front surface of the liquid crystal display device. A liquid crystal display device (hereinafter referred to as an LCD unit) composed of an LCD cell in which liquid crystal is sealed between two glass substrates on which a color filter and a TFT array are formed, and a non-light emitting LCD unit for external illumination. A configuration in which the backlight unit is arranged on the back side of the LCD unit is shown.
[0006]
When the input / output of each of the touch panel unit, the LCD unit, and the backlight unit is input / output to / from a predetermined main board, the input / output terminals from these units are connected via a flexible printed board (hereinafter referred to as “flexible”). Then, it is configured to be connected to the main board after being connected to the three flat connectors.
[0007]
As described above, when these three units are housed in separate portable electronic devices via separate connectors, there is a problem that it is impossible to reduce the size of the device by taking a considerably large space.
[0008]
The present invention has been made to solve the above-mentioned problems. The problem to be solved by the present invention is that a light guide plate used in an edge light type backlight unit has a wedge shape in cross section. A joint provided on the flex of the LCD unit is brought to a predetermined space on the back of the optical plate, and the backlight or / and touch panel output is input / output via the flex at this joint, and at least two inputs / outputs are provided at the joint. It is an object of the present invention to obtain an electronic device and a liquid crystal display device that can be connected to a main substrate through one connector by combining the parts into one body, and an input / output joining method for the electronic device.
[0009]
[Means for Solving the Problems]
The electronic device, the liquid crystal display device, and the input / output joining method of the electronic device according to the present invention have a wedge-shaped cross section of the edge light type light guide plate used in the LCD unit, and the thin portion of the inclined portion on the back surface of the wedge-shaped light guide plate. The LCD unit's input / output flexible joints are arranged, and at least the output flex of the backlight is joined at this part, so that a small gap generated in the light guide plate can be effectively used to reduce the size of electronic devices and liquid crystal display devices. It was made to make it easier.
[0010]
An electronic apparatus according to the present invention is an electronic apparatus having a liquid crystal display device, wherein a joint portion for joining a flexible input / output terminal of an edge light type backlight to a flexible input / output terminal of the liquid crystal display device, and the joint portion And the output of the backlight joined together in one input / output terminal for a liquid crystal display device, and the joint is connected to the oblique side portion of the light guide plate of the edge light type backlight with a wedge-shaped cross section on the back side It is arranged at a predetermined space position.
[0011]
The liquid crystal display device of the present invention is a liquid crystal display device having an edge light type backlight, and a joint portion for joining the flexible input / output terminal of the edge light type backlight to the flexible input / output terminal of the liquid crystal display device; And an input / output terminal in which the input / output of the backlight joined at this joint is combined into one input / output terminal for a liquid crystal display device, and the back cross section of the light guide plate of the edge light type backlight Is disposed at a predetermined space position that becomes a wedge-shaped oblique side portion.
[0012]
An input / output joining method for an electronic device according to the present invention is an input / output joining method for an electronic device having a liquid crystal display device, wherein the flexible input / output end of the liquid crystal display device is used for flexible input / output of an edge light backlight. A flexible bonding process for the backlight to be bonded, and an output process for collectively inputting and outputting the input / output of the edge light type backlight bonded by this bonding process to one input / output for a liquid crystal display device. Is performed at a predetermined space position where the back side surface of the light guide plate of the backlight is a wedge-shaped oblique side portion.
[0013]
According to the electronic device, the liquid crystal display device, and the input / output joining method of the electronic device of the present invention, the input / output terminals of the touch panel unit, the backlight unit, and the LCD unit are joined together at the joint, and the joint is wedge-shaped. Since it is arranged in the thin part on the back side of the light guide plate to effectively use a small space and reduce the size of the device and the LCD, only one connector is required, the assembly man-hour is shortened, and the installation area of the connector is reduced. Significant reduction can be achieved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an electronic device, a liquid crystal display device, and an input / output joining method of the electronic device of the present invention will be described with reference to FIGS.
[0015]
As an electronic apparatus used in the present invention, an electronic apparatus in which a recording medium driving unit (HDD, FDD, optical pickup driving unit, flash memory, etc.) for recording / reproducing a recording medium and a camera as an imaging means such as a CCD are provided in a housing explain.
[0016]
1 is a schematic perspective view showing an input / output joining method of an electronic device, a liquid crystal display device, and an electronic device of the present invention, FIG. 2 is a side view in the direction of arrows AA in FIG. 1, and FIG. FIG. 4 is a front perspective view of the liquid crystal display device of the present invention, FIG. 5 is a perspective view showing the arrangement of a flexible printed board provided on the back surface of the light guide plate, and FIG. 6 is an electronic apparatus used in the present invention. FIG. 7 is an overall system diagram of an electronic apparatus and a liquid crystal display device used in the present invention.
[0017]
Before describing the above-described FIGS. 1 to 5 of the present invention, the overall configuration of the electronic apparatus of the present invention will be described with reference to FIGS.
[0018]
FIG. 6 shows the configuration of an electronic apparatus according to the present invention. Signals are exchanged between the electronic apparatus and a computer (hereinafter referred to as CPU) via a cradle 2.
[0019]
6A and 6B, reference numeral 1 denotes an electronic device having a built-in HDD unit. Reference numeral 2 denotes a mounting base for transmitting and receiving image data and the like captured by the electronic device 1 to and from the CPU. It is a cradle consisting of.
[0020]
The electronic device 1 is composed of a camera unit 5 pivotally attached to a pivot 4 disposed on the lower end side of a casing serving as a main body 3. As shown in FIG. 6C, the camera unit 5 can be rotated about 180 degrees with respect to the main body 3 around the pivot 4, and the lens 6 can be set at a predetermined position from the front side to the rear side.
[0021]
A liquid crystal display device (hereinafter referred to as LCD unit) 7 and various operation button groups 8 are disposed on the front side of the main body 3, and a touch panel unit 37 made of a transparent conductive film or the like is disposed on the panel surface of the LCD unit 7, A thin HDD unit (not shown) is disposed so as to be substantially parallel to the LCD unit 7, and an LED 12 for HDD access is disposed on the left side of the operation button group 8 to monitor the access state of the HDD unit. Is possible from the outside of the main body 3.
[0022]
Further, as shown in FIG. 6C, the semicircular portion 9 of the main body 3 is fitted into the semicircular concave portion 10 of the cradle 2 so that electrical connection is established, and the video terminal, audio terminal, USB ( Input / output to / from a CPU, CRT, or the like via a Universal Serial Bas) terminal (see FIG. 7). The cradle 2 also has a built-in charging circuit, can also be used as a charging device, and can be arranged inclined with respect to the mounting surface via the stand 11.
[0023]
FIG. 7 is an overall system diagram of the electronic apparatus according to the present invention, and the same reference numerals are given to portions corresponding to those in FIG.
[0024]
In the camera unit 5 of the electronic device 1, a subject image captured through the optical system of the lens 6 is projected onto an image sensor such as a CCD 13, and a video signal converted into an electrical signal by the CCD 13 and a sound collected by a microphone are collected. The signal and the like are supplied to the bus line 18 connected to the control circuit 36 constituted by the main computer via the mounting amplifier circuit 14 and the camera and audio signal processing circuit 15.
[0025]
An HDD (recording medium drive unit) 19, a buffer memory 21, and a memory card 23 are connected to the bus line 18 through interfaces 20, 22, and 24, and video signals stored in the buffer memory 21 and the HDD 19 through a control circuit 36. The video signal is displayed on the LCD unit 7 having the light guide plate 42 of the monitor backlight unit 26 via the monitor driving circuit 16 and the video signal is displayed by the touch panel unit 37 provided on the panel surface of the LCD unit 7. Menu instruction etc. are performed. In addition, sound signals are emitted through the speaker drive circuit 27 and the speaker 28, and if necessary, the image signals, sound signals, and USB are transmitted through the image signal processing circuit 31, the sound signal processing circuit 32, and the interface 33 in the cradle 2. Output the signal to the outside.
[0026]
The cradle 2 performs AC-DC conversion of an AC external power supply 34 through a plug 35 by a power supply circuit 30 and is supplied to a power supply circuit 25 disposed in the main body 3 of the electronic apparatus 1, and serves as a voltage source for the above-described circuits. It is operating.
[0027]
FIG. 4 is a perspective view of the panel surface showing the assembled state of the light guide plate 42, the LCD unit 7 and the touch panel unit 37 in the backlight unit 26 constituting the display device and the input device described above, and FIG. 38a, 38b, 40, and 41 are shown in FIG. 4 and 5, a transparent conductive film of the substantially rectangular touch panel unit 26 is disposed on the front surface of the substantially rectangular panel constituting the LCD unit 7, and the substantially rectangular shape is disposed on the back side of the LCD unit 7. The backlight unit 26 is provided.
[0028]
The flex along the back surface of the light guide plate 42 of the backlight unit 26 will be described with reference to FIGS. 1 to 3 and FIG.
[0029]
In each of the above-mentioned drawings, the touch panel unit 37 is a pointing device capable of inputting position information touched by touching a fingertip or a pen tip on a sensor that detects a pressure-sensitive type, capacitance change, resistance change, or the like. For example, a transparent conductive film is formed on a transparent substrate, wiring extraction terminals are provided at the four corners of the conductive film, a pattern is formed from these terminals, and the wiring 41 is connected to the position of the pointing point such as a fingertip. Input / output is usually performed through about 10 input / output lines patterned. In the conventional configuration, this input / output is connected to the input / output connector for the touch panel unit 37 and connected to the main board and the like.
[0030]
The LCD unit 7 may be either an active matrix display method using TFT as a switching element or a passive matrix display method using no transistor. The LCD unit 7 is provided on the LCD display panel and the edge of the LCD display panel. The data and gate side printed circuit board and the data and gate side tape carrier package are provided, and these input / output lines are connected to the main board via a flexible board 40 having, for example, about 30 input / output lines. 39 is input / output.
[0031]
Further, the LCD display panel is composed of a transparent glass substrate, a color filter, a liquid crystal, and the like on which matrix thin film transistors are formed. The input / output terminals of the LCD unit 7 are also connected to one independent connector portion in the conventional configuration.
[0032]
Further, in the transmissive LCD used for the backlight unit 26, for example, the backlight unit 26 disposed on the lower side (upper side in FIG. 1) of the LCD unit 7 is substantially the same as the display panel of the LCD unit 7. The light guide plate 42 has a substantially rectangular shape with a wedge-shaped cross section, and the light guide plate 42 is configured such that the thickness t1 of the right side 45R in FIGS. 1 and 2 is greater than the thickness t2 of the left side 45L. The upper side surface 45U of the light guide plate 42 is inclined from the right side surface 45R toward the left side surface 45L, and the lower side surface 45D is disposed flat so as to face the flat surface of the LCD unit 7.
[0033]
In this example, a plurality of light sources such as white LEDs 44 are further arranged along the longitudinal direction of the right side surface 45R of the light guide plate 42.
[0034]
The number of the plurality of light sources is appropriately determined in consideration of the balance of the size and brightness of the LCD display panel of the LCD unit 7.
[0035]
Conventionally, the input / output from the backlight unit 26 is input / output via an input / output connector of about 10 pins, for example, connected to an independent connector portion.
[0036]
As shown in FIG. 2, the light 46 emitted from the white LED 44 of the backlight unit 26 is reflected by the inclined portion of the upper surface 45U of the light guide plate 42 and emitted toward the LCD unit 7 and the touch panel unit 37 as shown in FIG. Is done.
[0037]
In this example, the flexible printed circuit 40 in which the input / output lines of the backlight unit 26 are patterned and / or the flexible printed circuit 41 in which the input / output lines of the touch panel unit 37 are patterned is the belt-shaped pattern in which the input / output lines 50 of the LCD unit 7 are patterned. It joins to the joint part 38b which protruded from the flexible board 38a.
[0038]
The joint portion 38b is disposed at a predetermined position in a space (gap) 49 formed between a parallel line 48 drawn parallel to the lower side surface 45D from the corner 47 on the right side surface of the light guide plate 42 and the upper side surface 45U.
[0039]
Although the space 49 is shown enlarged in FIGS. 1 and 2, in reality, the width of the space 49 in a 2.5-inch LCD display panel is about 0.3 mm. Although it was not possible to arrange it, it was a complete dead space, but this part is effectively used in the present invention. Obviously, the width of this space 49 varies with the dimensions of the LCD display panel.
[0040]
In this way, the tip of the flex 41 led out from the touch panel unit 37 and / or the flex 40 led out from the backlight unit 26 protrudes below the joint portion 38b of the flex 38a from the LCD unit 7 formed in the space 49 position. As shown in FIG. 3 after being inserted below the joint portion 38b, for example, the input / output line 50 is appropriately joined by a joining method such as thermocompression bonding, soldering, reflowing, adhesion with an adhesive, contact pressure, or the like. And the connecting line 53 are joined in a plane. In FIG. 3, a reinforcing land 52 is provided to increase the bonding strength.
[0041]
In the above-described electronic device, liquid crystal display device, and electronic device input / output joining method of the present invention, a relatively thick electronic device having a recording / reproducing driving means such as an HDD and a camera unit has been described as the electronic device. It is obvious that the present invention has an effect particularly suitable for a thin LCD such as a monitor LCD such as a PDA, a portable telephone, and a video tape recorder. Of course, the present invention can be applied to a digital camera, a portable recording / reproducing device, a portable imaging device, and the like. Moreover, although the above-mentioned structure demonstrated the flexible printed circuit board (flexible), these contain a flexible connection member like a flexible cable.
[0042]
【The invention's effect】
According to the electronic device, the liquid crystal display device, and the input / output joining method of the electronic device according to the present invention, the joint portion in which the input / output flex of the touch panel unit and the backlight unit is provided on the input / output flex of the LCD unit is a wedge-shaped light guide plate. Since it is arranged and joined in the dead space generated in step 1, and input / output to / from the main board via one input / output connector, the device can be reduced in size and only one connector part can be used. The installation area can be reduced, and the number of assembly steps can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining a bonding method of a flexible printed board of a liquid crystal display device used in an electronic apparatus of the present invention.
FIG. 2 is a schematic side view of the liquid crystal display device as viewed from the direction of arrows AA in FIG.
FIG. 3 is a plan view of an essential part showing a method for joining flexible printed boards of an electronic device of the present invention.
FIG. 4 is a perspective view of the liquid crystal display device used in the electronic apparatus of the present invention as seen from the panel surface.
FIG. 5 is a rear view of a liquid crystal display device used in an electronic apparatus applied to the present invention.
FIG. 6 is a perspective view of an electronic device main body and a cradle showing an embodiment of the electronic device applied to the present invention.
FIG. 7 is a flowchart for explaining the operation of the electronic apparatus of the invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electronic device, 2 ... Cradle, 3 ... Main body, 4 ... Axis, 5 ... Camera part, 7 ... LCD unit, 26 ... Backlight unit, 37 ... Touch panel unit, 38a ... LCD Flexible printed circuit board from 38b ... Bonding part, 39 Connector part, 40 Flexible printed circuit board from backlight, 41 Printed circuit board from touch panel, 42 Light guide plate, 49 Space

Claims (6)

In an electronic device having a liquid crystal display device,
A joining portion for joining the input / output terminals of the flexible printed circuit board of the edge light type backlight to the input / output terminals of the flexible printed circuit board of the liquid crystal display device;
An input / output terminal that combines the input and output of the backlight joined at the joint into one input / output terminal for the liquid crystal display device;
An electronic apparatus, wherein the joining portion is disposed in a predetermined space position where a cross-section on the back side of the light guide plate of the edge light type backlight is a wedge-shaped oblique side portion. The electronic apparatus according to claim 1, wherein an input / output end of a flexible printed board of a touch panel provided on a front surface of the liquid crystal display device is bonded to the bonding portion. In a liquid crystal display device having an edge light type backlight,
A joint for joining the input / output terminals of the flexible printed circuit board of the edge light type backlight to the input / output terminals of the flexible printed circuit board of the liquid crystal display device;
An input / output terminal that combines the input and output of the backlight joined at the joint into one input / output terminal for the liquid crystal display device;
The liquid crystal display device according to claim 1, wherein the joining portion is disposed at a predetermined space position where a cross section on the back side of the light guide plate of the edge light type backlight is a wedge-shaped oblique side portion. 4. The liquid crystal display device according to claim 3, wherein an input / output end of a flexible printed board of a touch panel provided on the front surface of the liquid crystal display device is joined to the joint portion. In an input / output joining method for an electronic apparatus having a liquid crystal display device,
Backlight flexible printed circuit board joining process for joining the input / output ends of the flexible printed circuit board of the liquid crystal display device to the input / output of the flexible printed circuit board of the edge light type backlight,
An input / output process for inputting / outputting the input / output of the backlight of the edge light system joined in the joining process into one input / output for the liquid crystal display device;
An input / output joining method for an electronic device, wherein the joining process is performed at a predetermined space position where the back side cross section of the light guide plate of the backlight is a wedge-shaped oblique side portion. 6. The flexible printed circuit board bonding process of the backlight and the flexible printed circuit board bonding process of the touch panel for bonding the input / output ends of the flexible printed circuit board of the touch panel provided on the front surface of the liquid crystal display device. I / O joining method for electronic equipment.

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