JP2005292285A - Electro-optical device manufacturing method and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrooptical device which is an easy manufacturing method wherein the constituent article of the electrooptical device can be assembled in an electrooptical panel with high precision, and electronic equipment. <P>SOLUTION: The manufacturing method includes: a projection part formation stage of forming a projection part at least at a portion of a non-display area on at least one surface of the electrooptical panel; and an assembling stage of assembling the constituent article of the electrooptical devices in the electrooptical panel on the basis of the projection part of the electrooptical panel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing an electro-optical device, and an electronic apparatus, and more particularly, a method for manufacturing an electro-optical device capable of assembling components of the electro-optical device on an electro-optical panel with high accuracy by a simple manufacturing method. , And electronic devices.

  The liquid crystal display device mainly includes a liquid crystal display panel configured by sandwiching liquid crystal between glass substrates on which electrodes are formed, a first polarizing plate and a second polarizing plate bonded to both surfaces of the liquid crystal display panel, And a backlight for emitting light to the liquid crystal display panel. In a liquid crystal display device, when a voltage is applied to the liquid crystal, the alignment direction of the liquid crystal changes, and the polarization state of light transmitted through the liquid crystal changes according to the voltage. By passing the light transmitted through the liquid crystal through the polarizing plate, light and dark according to the polarization state of the light is displayed.

  A polarizing plate used in a liquid crystal display device has a property of changing natural light into linearly polarized light. When incident light is divided into orthogonal deflection components, only one of them is allowed to pass, and the other polarization component is blocked by absorption, reflection, scattering, or the like. When the two polarizing plates are arranged orthogonally, both polarized components are absorbed, resulting in black display. The polarizing plate is used by being arranged on the surface of the liquid crystal display panel in a state where the polarization axis is orthogonal or parallel depending on the display mode. The polarizing plate has a great influence on the optical characteristics of the liquid crystal display device, and in order to obtain image display uniformity over the entire screen, it is necessary to align the polarizing plate and the liquid crystal display panel with high accuracy.

  Conventionally, since the polarizing plate is pasted on the basis of the outer shape of the liquid crystal display panel (see, for example, Patent Document 1), the variation in the outer shape of the polarizing plate, the variation in the outer shape of the liquid crystal display panel, and the pasting accuracy of the polarizing plate Therefore, there is a problem that the polarizing plate cannot be attached to the liquid crystal display panel with high accuracy.

  In addition, when a driver IC or FPC is mounted on a liquid crystal display panel, an alignment mark is formed, and the position is adjusted using an expensive device such as a camera unit. In addition, there is a problem that it takes a long time for mounting.

JP 2003-172911 A

  The present invention has been made in view of the above problems, and a method for manufacturing an electro-optical device and an electronic apparatus capable of assembling components of the electro-optical device on an electro-optical panel with high accuracy by a simple manufacturing method The purpose is to provide.

  In order to solve the above-described problems and achieve the object, the present invention includes a protrusion forming step of forming a protrusion in a part of a non-display area on at least one surface of the electro-optical panel, An assembling step of assembling a component of the electro-optical device on the electro-optical panel with the protrusion as a reference.

  Accordingly, positioning can be performed with reference to the protrusion formed in the non-display area of the electro-optical panel, and the components of the electro-optical device can be assembled to the electro-optical panel. The component of the electro-optical device can be assembled to the electro-optical panel with high accuracy by a simple manufacturing method. As a result, it is possible to provide a method for manufacturing an electro-optical device capable of assembling a component of the electro-optical device on the electro-optical panel with high accuracy by a simple manufacturing method.

  According to a preferred aspect of the present invention, it is desirable that in the assembling step, a polarizing plate is bonded to the at least one surface of the electro-optical panel based on the protrusion. As a result, the position and orientation of the polarizing plate depends on the accuracy of the outer shape of the electro-optic panel as compared with the method of aligning the polarizing plate with respect to the outer shape such as the sides and corners of the electro-optic panel. There is nothing. Accordingly, the position and orientation of the polarizing plate with respect to the electro-optical panel can be matched with high accuracy.

  Moreover, according to a preferable aspect of the present invention, it is desirable that the thickness of the protrusion is substantially the same as the thickness of the polarizing plate. Thereby, a projection part can be made not conspicuous visually.

  According to a preferred aspect of the present invention, it is desirable that in the assembling step, a semiconductor element is mounted on the electro-optical panel based on the protrusion. This eliminates the need for an expensive assembling apparatus or camera unit, and allows the semiconductor element to be mounted on the electro-optical panel with high accuracy by a simple manufacturing method.

  According to a preferred aspect of the present invention, it is desirable that in the assembly step, a wiring board is mounted on the electro-optical panel based on the protrusion. This eliminates the need for an expensive assembling apparatus or camera unit, and allows the wiring substrate to be mounted on the electro-optical panel with high accuracy by a simple manufacturing method.

  According to a preferred aspect of the present invention, it is desirable that the protrusion is formed along the outer periphery of the electro-optical panel. Thereby, it can assemble | attach on the basis of the several position of a projection part, and can assemble | attach with higher precision.

  According to a preferred aspect of the present invention, it is desirable that the protrusion is formed by a photolithography method in the protrusion formation step. Thereby, a projection part can be formed with high precision.

  According to a preferred aspect of the present invention, in the protrusion forming step, a large-sized panel structure including a plurality of electro-optical panels is formed on a non-display area on at least one surface of each electro-optical panel by photolithography. It is desirable to form a plurality of electro-optical panels by cutting the large panel structure after forming the protrusions on the portions. Thereby, the projection part of each electro-optical panel can be formed on the basis of the large-sized panel, and the projection part can be formed with higher accuracy.

  According to a preferred aspect of the present invention, it is desirable that the electronic apparatus is mounted with the electro-optical device manufactured by the electro-optical device manufacturing method of the present invention. It is possible to provide an electric apparatus equipped with an electro-optical device in which the component is assembled with high accuracy.

  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 present invention, an electro-optical device refers to a device that converts an electrical signal into an optical signal. In the following embodiments, a liquid crystal display device will be described as an example of an electro-optical device, but the present invention is not limited to this.

[Structure of electro-optical device]
FIG. 1 is a diagram illustrating a configuration example of an electro-optical device 1 according to an embodiment of the present invention, FIG. 1-1 is a perspective view of the electro-optical device 1 according to the embodiment, and FIG. The AA sectional drawing of is shown.

  As shown in FIG. 1, the electro-optical device 1 includes a liquid crystal display panel 10 for displaying an image, a first polarizing plate 20 and a second polarizing plate 30 attached to both surfaces of the liquid crystal display panel 10, and a liquid crystal display. A backlight unit 40 for irradiating the panel 10 with illumination light, a reflector 50 that reflects the light of the backlight unit 40 toward the display surface, an LED 60 that is a light source, and a COG on the second substrate of the liquid crystal display panel 10 The mounted driver IC (semiconductor element) 70 and the FPC that is routed from the second substrate of the liquid crystal display panel 10 to the back side of the reflector 50 and mounted so that the LED 60 is disposed on the side of the backlight unit 40. (Flexible Printed Circuits: wiring board) 80 is made of, for example, plastic and accommodated in a reflective case 90 having a frame shape.

  The liquid crystal display panel 10 is configured by sealing a liquid crystal between two first and second substrates 10a and 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 first drive electrode formed of an ITO film, an alignment film, and the like are formed. A protrusion 10a1 is formed on the outer periphery of the surface on the light emission side of the first substrate 10a. On the second substrate 10b, a switching element such as a TFD or a TFT (not shown), a second drive electrode formed of an ITO film, an alignment film, and the like are formed. A protrusion 10b1 is formed on the outer periphery of the surface on the light incident side of the second substrate 10b. Further, the second substrate 10b has a protruding portion 10b2 protruding in a plane in the Y-axis direction from the first substrate 10a.

  A driver IC 70 for driving the liquid crystal display panel 10 is COG mounted on the surface of the protrusion 10b2, and a drive signal is supplied to the driver IC 70 and the LED 60 at the surface end of the protrusion 10b2. FPC 80 is mounted by ACF or the like. Note that the driver IC 70 is not limited to the configuration in which the COG is mounted, and a COF structure (Chip On Film) mounted in the FPC 80 may be adopted. The FPC 80 is bent inward and fixed to the reflector 50 with double-sided tape (not shown).

  In the liquid crystal display panel 10, an electric field is formed by applying electric charges between the first driving electrode and the second driving electrode formed on the two first and second substrates 10a and 10b arranged opposite to each other. The pixels are turned on / off by changing the orientation of the liquid crystal at the position corresponding to the color filter.

  On the back side (light emission side and light incident side) surfaces of the first substrate 10a and the second substrate 10b, the type of liquid crystal to be used, that is, TN (twisted nematic) mode, STN (super TN) mode, D- The first polarizing plate 20 and the second polarizing plate 30 are pasted and arranged in a predetermined direction according to an operation mode such as an STN (double-STN) mode, or a normally white mode / normally black mode.

  The first polarizing plate 20 and the second polarizing plate 30 are formed by stretching a polyvinyl alcohol (PVA) film in one direction and immersing it in a solution containing iodine or dichroic dye, thereby adsorbing iodine or dichroic dye, A deflecting function is given, and a cellulose film is coated as a protective film. Moreover, the polarization direction of the 1st polarizing plate 20 and the 2nd polarizing plate 30 is determined by the extending | stretching direction of a PVA film.

  A backlight unit 40 is provided below the second polarizing plate 30. The backlight unit 40 is diffused by the light guide plate that guides the illumination light emitted from the LED 60 disposed on the side thereof, the diffusion sheet that diffuses the illumination light emitted from the light guide plate, and the diffusion sheet. It can be comprised from the prism sheet etc. which polarize illumination light. The backlight unit 40 can be fixed to the reflection case 90 with a light-shielding double-sided tape, for example. On the lower surface side of the backlight unit 40, a reflecting plate 50 that reflects illumination light emitted from the backlight unit 40 to the display surface side is disposed. The reflection plate 50 can be fixed to the reflection case 90 with a double-sided tape.

[First polarizing plate 20 and second polarizing plate 30]
FIG. 2 is a cross-sectional view illustrating an example of the configuration of the first polarizing plate 20 and the second polarizing plate 30. As shown in FIG. 2, the first polarizing plate 20 and the second polarizing plate 30 include a polarizing layer 101 having a polarizing function made of a PVA film or the like, and an adhesive layer made of a transparent adhesive formed on the lower surface of the polarizing layer 101. 102, a peelable sheet-like first protective film 103 formed on the lower surface of the adhesive layer 102, and a peelable sheet-like second protective film 104 formed on the upper surface of the polarizing layer 101. Yes.

[Liquid Crystal Display Panel 10]
FIG. 3 is a perspective view of the liquid crystal display panel 10. As shown in FIG. 3, the first substrate 10a of the liquid crystal display panel 10 is formed with a frame-shaped protrusion 10a1 in the non-display area along the outer periphery. Similarly, a frame-like protrusion 10b1 (see FIG. 1) is formed in the non-display area along the outer periphery of the second substrate 10b. Assembly of components of an electro-optical device such as a polarizing plate, a driver IC, and an FPC is performed on the basis of at least one corner (for example, S portion) of the protrusion 10a1.

[Method for Forming Projection of Liquid Crystal Display Panel 10]
FIG. 4 is an explanatory diagram for explaining a method of forming the protrusions of the liquid crystal display panel 10. In FIG. 4, the manufacturing process of a liquid crystal display panel is performed using two large-sized substrates that can be multi-sided, and a large format including a plurality of liquid crystal display panels (5 × 4 in the example shown in the figure) 10. A panel structure 200 is formed (large panel structure manufacturing process).

  Next, using the photolithography method, the protrusions 10a1 and 10b1 are formed on the outer periphery of each liquid crystal display panel 10 of the large panel structure 200 (projection part forming step). Specifically, after applying a photoresist to the large panel structure, exposure is performed with an exposure apparatus using a multi-faced photomask. Thereafter, by performing development, etching, and peeling processes, the protrusions 10a1 can be formed on the outer periphery of each liquid crystal display panel 10 of the large panel structure. The protrusion 10b1 is formed by a similar method.

  The large panel structure 200 is cut and separated for each single liquid crystal display panel 10 (cutting step). Thereby, a single liquid crystal display panel 10 as shown in FIG. 6 is cut out, and 5 × 4 liquid crystal display panels 10 are manufactured.

[Pasting method of polarizing plate 20 and polarizing plate 30]
FIG. 5 is a diagram for explaining a method of attaching the polarizing plate 20 to the liquid crystal display panel 10. In FIG. 5, the first polarizing plate 20 is attached to the inside of at least one corner (for example, S portion in FIG. 3) of the protrusion 10 a 1 of the first substrate 10 a of the liquid crystal display panel 10. As described above, since the first polarizing plate 20 is pasted on the basis of the protruding portion 10a1 formed on the liquid crystal display panel 10, the polarizing plate is used on the basis of the outer shape such as the side or corner of the liquid crystal display panel. Compared to the alignment method, the position and orientation of the first polarizing plate 20 are not affected by the accuracy of the outer shape of the liquid crystal display panel. Therefore, the position and orientation of the first polarizing plate 20 with respect to the liquid crystal display panel 10 can be matched with high accuracy. Further, since the thickness of the protrusion 10a1 is substantially the same as the thickness of the first polarizing plate 20, the protrusion 10a1 does not stand out, and the protrusion 10a1 impairs the aesthetic appearance of the liquid crystal display panel 10. Absent.

  Similarly, a frame-like protrusion 10b1 is formed in the non-display area along the outer periphery of the second substrate 10b, and the second polarizing plate 30 is pasted on the basis of the protrusion 10b1.

[Method of mounting driver IC 70]
FIG. 6 is a diagram for explaining a method of mounting the driver IC 70 on the liquid crystal display panel 10. In FIG. 6, on the surface of the protruding portion 10b2 of the second substrate 10b with reference to at least one corner (for example, S portion in FIG. 3) of the protrusion 10a1 of the first substrate 10a of the liquid crystal display panel 10, the ACF The driver IC 70 is mounted with the above. As described above, since the FPC 80 is mounted on the basis of the protruding portion 10a1 of the first substrate 10a of the liquid crystal display panel 10, it is not necessary to align the alignment marks and an expensive positioning device such as a camera unit is unnecessary. Thus, the driver IC 70 can be mounted easily and at low cost.

[FPC80 mounting method]
FIG. 7 is a diagram for explaining a method of mounting the FPC 80 on the liquid crystal display panel 10. 7, at least one corner of the protrusion 10a1 of the first substrate 10a of the liquid crystal display panel 10 (for example, S portion in FIG. 3) is used as a reference at the surface end of the protruding portion 10b2 of the second substrate 10b. The FPC 80 is mounted with ACF or the like. As described above, since the FPC 80 is mounted on the basis of the protruding portion 10a1 of the first substrate 10a of the liquid crystal display panel 10, it is not necessary to align the alignment marks and an expensive positioning device such as a camera unit is unnecessary. Thus, the FPC 80 can be mounted easily and at low cost.

(Modification)
FIG. 8 is a perspective view of a liquid crystal display panel 10 according to a modification. In the above embodiment, the protrusion 10a1 is provided along the outer periphery of the liquid crystal display panel 10. However, as shown in FIG. 8, the protrusion 301 is formed in a part of the non-display area of the liquid crystal display panel 10. It is also good. Assembly of components of an electro-optical device such as a polarizing plate, a driver IC, and an FPC is performed with reference to the protrusion 301.

(Application example to electronic equipment)
Next, specific examples of electronic devices to which the electro-optical device according to the invention can be applied will be described with reference to FIG. FIG. 9A is a perspective view illustrating an example in which the electro-optical device according to the invention is applied to a display unit of a portable personal computer 400 (so-called notebook computer). As shown in the figure, the personal computer 400 includes a main body unit 402 having a keyboard 401 and a display unit 403 to which the electro-optical device according to the invention is applied. FIG. 9B is a perspective view illustrating an example in which the electro-optical device according to the invention is applied to the display unit of the mobile phone 500. As shown in the figure, a mobile phone 500 includes a plurality of operation buttons 501, a receiving part 502, a mouthpiece 503, and a display unit 504 to which the electro-optical device according to the invention is applied.

  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-Conduction Electoron). -Emitter Display etc.), LED (Light Emitting Diode) display devices, etc., and can be used for various electro-optical devices that can control 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 example. AA sectional drawing of FIG. Sectional drawing which shows the cross-section of the polarizing plate which concerns on an Example. The perspective view of a liquid crystal display panel. Explanatory drawing for demonstrating the formation method of the projection part of a liquid crystal display panel. The figure for demonstrating the method to affix a polarizing plate on a liquid crystal display panel. 4A and 4B are diagrams for explaining a method of mounting a driver IC on a liquid crystal display panel. 4A and 4B illustrate a method for mounting an FPC on a liquid crystal display panel. The perspective view of the liquid crystal display panel which concerns on a modification. 1 is a perspective view of a personal computer equipped with an electro-optical device according to an embodiment. 1 is a perspective view of a mobile phone including an electro-optical device according to an example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Electro-optical device, 10 Liquid crystal display panel, 10a 1st board | substrate, 10b 2nd board | substrate, 20 1st polarizing plate, 30 2nd polarizing plate, 40 Backlight part, 50 Reflector, 60 LED, 70 Driver IC, 80 FPC , 90 Reflective case, 100 Large polarizing plate structure, 101 Polarizing layer, 102 Adhesive layer, 103 First protective film, 104 Second protective film, 200 Large panel structure, 201 Protrusion, 400 Personal computer, 401 Keyboard, 402 Main unit, 403 display unit, 500 mobile phone, 501 operation button, 502 earpiece, 503 mouthpiece, 504 display unit

Claims (9)

A protrusion forming step of forming a protrusion on a part of the non-display area of at least one surface of the electro-optic panel;
An assembling step of assembling a component of an electro-optical device to the electro-optical panel based on the protrusion of the electro-optical panel;
A method for manufacturing an electro-optical device.   2. The method of manufacturing an electro-optical device according to claim 1, wherein in the assembling step, a polarizing plate is bonded to the at least one surface of the electro-optical panel based on the protrusion.   The method of manufacturing an electro-optical device according to claim 2, wherein a thickness of the protrusion is substantially the same as a thickness of the polarizing plate.   2. The method of manufacturing an electro-optical device according to claim 1, wherein, in the assembling step, a semiconductor element is mounted on the electro-optical panel based on the protrusion.   2. The method of manufacturing an electro-optical device according to claim 1, wherein, in the assembling step, a wiring board is mounted on the electro-optical panel based on the protrusion.   6. The method of manufacturing an electro-optical device according to claim 1, wherein the protrusion is formed along an outer periphery of the electro-optical panel.   The method of manufacturing an electro-optical device according to claim 1, wherein the protrusion is formed by a photolithography method.   In the protrusion forming step, a protrusion is formed on a part of a non-display area of at least one surface of each electro-optical panel by a photolithographic method on a large panel structure including a plurality of electro-optical panels, The method for manufacturing an electro-optical device according to claim 1, wherein the large-sized panel structure is cut to obtain a plurality of electro-optical panels.   An electronic apparatus comprising the electro-optical device manufactured by the method for manufacturing an electro-optical device according to claim 1.

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