JP2005062627A - Electrooptical device and electronic apparatus equipped with the electrooptical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device which can prevent the deflection of an interface substrate for a light source when an interface substrate for a display and an interface for a light source are bent to an inner side and an electronic apparatus which is equipped with the electrooptical device. <P>SOLUTION: The electrooptical device 1 has the plastic and bendable interface substrate 60 for the display for the purpose of delivering a drive signal to a substrate 10 for a display and the plastic and bendable interface substrate for the light source disposed on the side lower than the interface substrate 60 for the display for the purpose of delivering the drive signal to the light source. The interface substrate 60 for the display is joined with a portion of the interface substrate for the light source and is formed with an aperture 64 for preventing the defection of the interface substrate 70 for the light source when the interface substrate 60 for the display and the interface substrate for the light source are bent to the inner side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electro-optical device and an electronic apparatus including the electro-optical device, and more specifically, when the first interface board and the second interface board are bent inward, the second interface board The present invention relates to an electro-optical device capable of preventing bending and an electronic apparatus including the electro-optical device.

  An electro-optical device such as a liquid crystal display device irradiates light with a display substrate composed of a plurality of pixels made of liquid crystal, a display interface substrate for sending a drive signal to the display substrate, and the like. And a light guide plate that emits light emitted from the light source to a display substrate. Further, there is a light source interface board provided for arranging a light source, for example, an LED (Light Emitting Diode) in a casing or for wiring for supplying a lighting voltage for lighting the light source. Conventionally, a hard substrate such as a glass substrate has been used as the above-mentioned interface substrate. However, in recent years, flexible substrates such as FPC (Flexible Printed Circuits) and heat seal that are easy to deform and have a high degree of design freedom are used. Used (see Patent Documents 1 and 2).

JP-A-8-43844 Japanese Patent Laid-Open No. 11-258621

  However, the interface board is often used by being bent, but when the light source interface board is soldered to the outside of the bending position of the display interface board, the display interface board and the light source interface are used. When the substrate is bent inward, there is a problem that an inner ring difference occurs between the display interface substrate and the light source interface, and the light source interface substrate is bent. When the light source interface substrate is bent, stress is applied to the wiring and components of the light source interface substrate, and the wiring may be disconnected or the components may be damaged, which may cause abnormal lighting of the light source.

  The present invention has been made in view of the above, and in the case where the second interface board is joined and used outside the bent position of the first interface board, the first interface board and the second interface board are used. An object of the present invention is to provide an electro-optical device capable of preventing the second interface substrate from being bent when the interface substrate is bent inward, and an electronic apparatus including the electro-optical device.

  In order to solve the above-described problems and achieve the object, the present invention provides a plastic foldable first interface board for sending a drive signal to a display board, and a lower side than the first interface board. And a plastic foldable second interface board for sending a drive signal to the light source, and outside the bending position of the first interface board, A part of the first interface board is bonded to the first interface board to prevent the second interface board from bending when the first interface board and the second interface board are bent inward. An escape portion is formed for the purpose.

  Thereby, even when the first interface board and the second interface board are bent inward, the second interface board generated due to the inner ring difference between the first interface board and the second interface board. Can be prevented. As a result, bending of the second interface board applies stress to the wiring and components of the second interface board, preventing abnormal lighting of the light source that occurs when the wiring is disconnected or the components are damaged. can do.

  According to a preferred aspect of the present invention, the first interface board is formed with a land for soldering outside the bent position, and the land is formed on the part of the second interface board. In this case, preliminary solder is formed, and it is preferable that the part of the second interface board is overlapped with the land of the first interface board and soldered to be joined. Thereby, the second interface substrate can be firmly bonded to the first interface substrate by a simple method.

  According to a preferred aspect of the present invention, the relief portion of the first interface board comprises an opening, and when the first interface board and the second interface board are bent inward, It is desirable that a part of the second interface board is protruded from the opening to prevent its bending. Thereby, it is possible to reliably prevent the second interface board from being bent with a simple configuration.

  According to a preferred aspect of the present invention, it is desirable that the first interface board and the second interface board are FPCs. As a result, lightweight and flexible substrates can be used as the first interface substrate and the second interface substrate, and the degree of freedom in module design can be improved.

  According to a preferred aspect of the present invention, it is desirable that the first interface board and the second interface board are used in a state where they are bent or extended inward. Thereby, the freedom degree of the user of the electro-optical device can be improved.

  According to a preferred aspect of the present invention, it is desirable that the electronic apparatus includes the above-described electro-optical device. Accordingly, even when the first interface board and the second interface board are bent inward in the electronic device, the first interface board is generated due to the inner ring difference between the first interface board and the second interface board. The bending of the interface board 2 can be prevented.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. In the following embodiments, a liquid crystal display device will be described as an example, but the electro-optical device according to the present invention is not limited to this. In the present invention, a single electro-optical panel or electro-optical module is also referred to as an electro-optical device.

  FIG. 1 is a diagram illustrating a configuration example of an electro-optical device 1 according to the present embodiment. 1-1 is a perspective view showing an overall schematic configuration of the electro-optical device 1 of the present embodiment, FIG. 1-2 is a cross-sectional view taken along line AA in FIG. -B shows a cross-sectional view. As shown in FIG. 1, the electro-optical device 1 includes a display substrate 10 for displaying an image, an upper polarizing plate 20 attached to the upper side of the display substrate 10, and a lower side of the display substrate 10. The attached lower polarizing plate 30, the light guide plate 40 for guiding the illumination light emitted from the LEDs 80 to the display substrate 10, the outer frame 50 for fixing the display substrate 10 and preventing light leakage, A display interface board (first interface board) 60 for sending a drive signal to the display board 10 and a plurality of LEDs 80 (two in this embodiment) as light sources are mounted. And a light source interface board (second interface board) 70 for sending out the light.

  The display substrate 10 is configured such that liquid crystal is sealed between two first substrates (upper substrates) 10a and second substrates (lower substrates) 10b arranged to face each other. The first substrate 10a and the second substrate 10b are made of glass. On the first substrate 10a, a color filter (not shown), a protective layer, a first drive electrode formed of an ITO film, and the like are formed. On the second substrate 10b, a switching element such as TFD or TFT (not shown), a protective film, a second drive electrode, and the like are formed. The second substrate 10b has a COG structure (Chip On Glass) on which a driver IC 11 that is a drive circuit unit for driving the first drive electrode and the second drive electrode is mounted.

  In the electro-optical device 1, an electric field is generated by applying an electric charge between the first driving electrode and the second driving electrode formed on the two first and second substrates 10a and 10b arranged to face each other. The pixel is turned on / off by changing the orientation of the liquid crystal at the position corresponding to the color filter. An upper polarizing plate 20 and a lower polarizing plate 30 are attached to the upper side and the lower side of the display substrate 10, respectively. The upper polarizing plate 20 and the lower polarizing plate 30 are in a crossed Nicols state. A light guide plate 40 is provided below the lower polarizing plate 30, and an LED 80 is disposed on the side of the light guide plate 40. The light guide plate 40 and the LEDs 80 constitute a side edge type backlight.

  The display interface board 60 is made of a plastic foldable board, for example, a flexible board such as an FPC or a heat seal, and can be bent in the direction of arrow R in FIG. One end side of the display interface board 60 is electrically connected to the driver IC 11 of the display board 10. This connection can be made with an adhesive containing a conductive member. The display interface board 60 is mounted with electrical components 61 such as capacitors and resistors, a power supply IC 62, and the like, and has an opening 64 (details will be described later) for preventing the light source interface board 70 from being bent. Is formed. The light source interface board 70 is made of a plastic foldable board, for example, a flexible board such as an FPC or a heat seal. The light source interface board 70 is mounted with an LED 80 as a light source. One end side of the light source interface substrate 70 is fixed to the outer frame 50 with an adhesive or the like, and the other end side is bonded to the display interface substrate 60.

  FIG. 2 is an explanatory diagram for explaining the display interface board 60 and the light source interface board 70 in detail. 2A is a view of the display interface board 60 as viewed from the display surface side, and FIG. 2B is a view of the display interface board 60 and the light source interface board 70 as viewed from the back side. As shown in FIG. 2B, the display interface board 60 can be bent at a first folding position 63 and a second folding position 65. The display interface 70 is formed with a pair of lands 66 for joining the light source interface board 70 to the outside of the first folding position 63. As described above, when the display interface board 60 and the light source interface board 70 are bent inward at the first folding position 63 and the position where the light source interface board 70 overlaps, An opening 64 for preventing a part of the light source interface board 70 from protruding and preventing the light source interface board 70 from being bent is formed. Further, as shown in FIGS. 2-1 and 2-2, in the display interface board 60, the electrical component 61 and the power supply IC 62 are mounted outside the first bending position 63. Further, as shown in FIG. 2A, a reinforcing plate 67 made of glass epoxy or the like is provided on the back surface of the display interface board 20 behind the second bending position 65.

  FIG. 3 is an explanatory diagram for explaining a method of bonding the light source interface board 70 to the display interface board 60. 3A is a diagram illustrating the light source interface board 70 (front side), FIG. 3B is a diagram illustrating the display interface board 60 (back side), and FIG. It is a figure (back side) which shows the state which joined the interface board | substrate 70. FIG. As shown in FIG. 3A, a pair of lands (solid lands) 71, to which a preliminary solder 71 a is applied, are formed on the entire surface of the light source interface board 70. Further, as shown in FIG. 3B, the display interface board 60 is formed with a pair of lands 66 having holes 66a and plated on both surfaces 66b. Then, as shown in FIG. 3C, the land 71 of the light source interface board 70 is aligned with the land 66 while looking at the holes 66 a of the pair of lands 66 of the display interface board 60, and then the display interface board 66 of the display interface board 66. Soldering is performed on the entire surface of the lands 66 and 71 with thread solder from the front side, and both are joined. In this case, care should be taken so that solder does not leak to the back surface of the display interface board 60. This is because the back surface of the display interface substrate 60 needs to be flat when the display interface substrate 60 is bonded to the bottom surface of the electro-optical device 1.

  FIG. 4 is an explanatory diagram for explaining a usage state of the display interface board 60 and the light source interface board 70. FIG. 4A is a diagram illustrating a straight system used in a state where the display interface board 60 and the light source interface board 70 are extended, and FIG. 4A is a side view of the display interface board 60 and the light source interface board 70. It is a figure which shows the bending method used in the state bent. The electro-optical device 1 of the present embodiment can be used in an extended state or a bent state. As shown in FIG. 4B, when the display interface board 60 and the light source interface board 70 are used while being bent inward, the display interface board 60 is attached to the bottom surface of the electro-optical device 1 with an adhesive or the like. Join. In this case, since a part of the bent portion of the light source interface board 70 protrudes from the opening 64 of the display interface board 60, the light source interface due to the inner ring difference between the display interface board 60 and the light source interface board 70. It is possible to prevent the substrate 70 from being bent.

  As described above, according to the electro-optical device 1 of the present embodiment, a part of the light source interface board 70 is joined to the display interface board 60 outside the bending position 63, and the display interface is further provided. In the substrate 60, when the display interface substrate 60 and the light source interface substrate 70 are bent inward, a relief portion (opening 64 in this embodiment) is formed to prevent the light source interface substrate 70 from being bent. doing. Thereby, even when the display interface board 60 and the light source interface 70 are bent inward, the deflection of the light source interface board 70 caused by the inner ring difference between the display interface board 60 and the light source interface 70. Can be prevented. As a result, the light source interface board 70 is bent, stress is applied to the wiring and components of the light source interface board 70, and an abnormal lighting of the LED 80 caused by disconnection of the wiring or damage of the components is prevented. can do.

  In addition, according to the electro-optical device 1 of the present embodiment, the light source interface board 70 is formed with a pair of lands 71 on which the preliminary solder 71b is applied, and the display interface board 60. A pair of lands 66 having holes 66 a are formed outside the first folding position 63. Then, the lands 71 of the light source interface board 70 are aligned and soldered to the lands 66 of the display interface board 60 to join them together. Thereby, the light source interface substrate 70 can be firmly bonded to the display interface substrate 60 by a simple method.

  In addition, according to the electro-optical device 1 of the present embodiment, the opening 64 is formed in the display interface substrate 60 as a relief portion of the light source interface substrate 70, and the display interface substrate 60 and the light source interface substrate 70 are placed inside. When bent, the bent portion of the light source interface board 70 is protruded from the opening 64 to prevent its bending, so that the light source interface board 70 can be reliably prevented from bending with a simple configuration. it can. Further, in the electro-optical device 1 of the present embodiment, since the FPC is used as the display interface board 60 and the light source interface board 70, the display interface board 60 and the light source interface board 70 are lightweight and flexible. A rich substrate can be used, and the degree of freedom in module design can be improved.

  In addition, according to the electro-optical device 1 of the present embodiment, the display interface board 60 and the light source interface board 70 can be used in a state of being bent or extended inward, so that the user of the electro-optical device 1 The degree of freedom can be improved. In the above embodiment, the driver IC 11 is mounted with a COG structure. However, the present invention is not limited to this, and a COF (Chip On Film) structure in which the driver IC 11 is mounted on the display interface board 60. You may decide to use.

(Modification)
FIG. 5 is an explanatory diagram for explaining a modification of the above embodiment. FIG. 5A is an explanatory diagram for explaining a first modification of the above embodiment, FIG. 5B is an explanatory diagram for explaining a second modification of the above embodiment, and FIG. It is explanatory drawing for demonstrating the modification 3 of an example. In the above embodiment, the display interface board 60 is formed with the opening 64 as a relief part of the light source interface board 70, and the bent part of the light source interface board 70 is projected from the opening 64 to prevent the bending. It is. On the other hand, in the first modification, as shown in FIG. 5A, an H-shaped slit portion 101 is formed on the display interface substrate 60 as a relief portion of the light source interface substrate 70, and the light source interface substrate is formed. In this configuration, a part of 70 is protruded from the slit portion to prevent its bending. In the second modification, as shown in FIG. 5B, a cross-shaped slit portion 102 is formed on the display interface board 60. Furthermore, as shown in FIG. 5C, the third modification has a configuration in which an X-shaped slit portion 103 is formed on the display interface board 60. Thus, the escape portion for preventing the light source interface board 70 from being bent is not limited to the opening 64, and various forms can be employed.

  FIG. 6 is a block diagram illustrating a configuration of an electronic apparatus including the electro-optical device according to the invention. The electronic apparatus includes a display information output source 204, a display information processing unit 206, a drive circuit 200 including a control circuit for switching display modes, the electro-optical device 1, a clock generation unit 202, and a power source 210. . The display information output source 204 includes a ROM (Read Only Memory), a RAM (Random Access Memory), a memory such as an optical disc, a tuning circuit that tunes and outputs an image signal of a television signal, and the like. The image signal of a predetermined format is processed and output to the display information processing means 206 based on the clock from. The display information processing means 206 is configured to include various known processing circuits such as an amplification / polarity inversion circuit, a phase expansion circuit, a rotation circuit, a gamma correction circuit, or a clamp circuit, and is input based on a clock signal. A digital signal is sequentially generated from the display information and is output to the drive circuit 200 together with the clock signal CLK. The drive circuit 200 drives the electro-optical device 1. The power source 210 supplies a predetermined power source to each circuit described above.

  The electro-optical device according to the present invention can be used for transmissive, reflective, and transflective electro-optical devices. The electro-optical device according to the present invention is applied to a passive matrix type electro-optical device or an active matrix type electro-optical device (for example, an electro-optical panel including a TFT (thin film transistor) or a TFD (thin film diode) as a switching element). Can be used. Furthermore, the electro-optical device according to the present invention is not limited to a liquid crystal display device, but is an organic electroluminescence device, an inorganic electroluminescence device, a plasma display device, an electrophoretic display device, an electron emission display device (Field Emission Display and Surface-Condition Electron). -Emitter Display, etc.), LED (light emitting diode) display devices, etc., and can be used for various electro-optical devices capable of controlling the display state for each of a plurality of pixels.

  An electronic device equipped with the electro-optical device according to the present invention includes a mobile phone, a portable information device called PDA (Personal Digital Assistants), a portable personal computer, a personal computer, a workstation, a digital still camera, an in-vehicle monitor, a digital Widely used in electronic devices such as video cameras, LCD TVs, viewfinder type, monitor direct-view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, video phones, and POS terminals. Can do.

1 is a perspective view of an electro-optical device according to an embodiment. AA sectional drawing of FIGS. 1-1. BB sectional drawing of FIGS. 1-1. The figure which looked at the interface board for a display from the display surface side. The figure which looked at the interface board for a display from the back side. The figure which shows the interface board for light sources. The figure which shows the interface board for a display. The figure which shows joining of the interface board for light sources, and the interface board for a display. The figure which shows the straight system used in the state which extended the interface board for a display, and the interface board for light sources. The figure which shows the bending system used in the state which bent the interface board for a display, and the interface board for light sources inside. The figure which shows the modification 1 of a present Example. The figure which shows the modification 2 of a present Example. The figure which shows the modification 3 of a present Example. FIG. 6 is a block diagram illustrating a configuration of an electronic apparatus including the electro-optical device according to the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electro-optical device, 10 display board | substrate, 10a 1st board | substrate, 10b 2nd board | substrate, 11 driver IC, 20 upper polarizing plate, 30 lower polarizing plate, 40 light guide plate, 50 outer frame, 60 display interface board | substrate, 61 Electric parts, 62 power supply IC, 63 first bending position, 64 opening 65 second bending position, 66 land, 67 reinforcing plate, 70 light source interface board, 71 land, 80 LED, 200 drive circuit, 202 clock generation Means, 204 Display information output source, 206 Display information processing means, 210 Power supply

Claims (6)

A plastic bendable first interface board for sending drive signals to a display board for displaying an image;
A second, flexible, bendable interface board disposed below the first interface board for sending drive signals to the light source;
Have
A part of the second interface board is bonded to the outside of the bending position of the first interface board,
The first interface board is formed with a relief portion for preventing the second interface board from being bent when the first interface board and the second interface board are bent inward. An electro-optical device. The first interface board is formed with a land for soldering outside the bent position,
Preliminary solder is formed on the part of the second interface board,
2. The electro-optical device according to claim 1, wherein the part of the second interface substrate is overlapped with the land of the first interface substrate and soldered and bonded.   The relief portion of the first interface board includes an opening, and when the first interface board and the second interface board are bent inward, a part of the second interface board is The electro-optical device according to claim 1, wherein the electro-optic device protrudes from the opening portion to prevent the bending thereof.   The electro-optical device according to claim 1, wherein the first interface board and the second interface board are FPCs.   5. The electro-optical device according to claim 1, wherein the first interface board and the second interface board are used in a state of being bent or extended inward. apparatus.   An electronic apparatus comprising the electro-optical device according to claim 1.

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