JP4058918B2 - Display device and projection device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device using a flexible printed board that is aligned by image recognition and connected by pressure bonding using an anisotropic conductive film.
[0002]
[Prior art]
A liquid crystal device such as a liquid crystal light valve is configured by sealing liquid crystal between two substrates such as a glass substrate and a quartz substrate. In a liquid crystal light valve, active elements such as thin film transistors (hereinafter referred to as TFTs) are arranged in a matrix on one substrate, a counter electrode is arranged on the other substrate, and sealed between both substrates. By changing the optical characteristics of the stopped liquid crystal layer according to the image signal, it is possible to display an image.
[0003]
That is, an image signal is supplied to pixel electrodes (ITO) arranged in a matrix by TFT elements, and a voltage based on the image signal is applied to the liquid crystal layer between the pixel electrode and the counter electrode to change the arrangement of liquid crystal molecules. Let As a result, the transmittance of the pixel is changed, and light passing through the pixel electrode and the liquid crystal layer is changed according to the image signal to perform image display.
[0004]
The TFT substrate on which the TFT is disposed and the counter substrate disposed to face the TFT substrate are manufactured separately. Both substrates are bonded together with high accuracy in the panel assembling process, and then liquid crystal is sealed therein.
[0005]
In the panel assembly process, first, an alignment film is formed on the opposing surfaces of the TFT substrate and the counter substrate manufactured in each substrate process, that is, on the surface in contact with the liquid crystal layer of the counter substrate and the TFT substrate, and then the rubbing process. Is done. Next, a seal portion serving as an adhesive is formed on the edge of one substrate. The TFT substrate and the counter substrate are bonded together using a seal portion, and are cured by pressure bonding while performing alignment. A part of the seal part is provided with a notch, and the liquid crystal is sealed through the notch.
[0006]
Mounted terminals for transmitting and receiving drive signals, timing signals, image signals, and the like of the liquid crystal panel are arranged between the various drive circuits on the panel and external devices in the area outside the seal portion of the TFT substrate. . An FPC (flexible printed board) is employed for connection with an external device. The mounting terminal and the FPC are pressure-bonded using an ACF (Anisotoropic Conductive Film) (anisotropic conductive film) formed on the FPC.
[0007]
By the way, when the liquid crystal panel is used for a three-plate projector, the screen positions of the three panels need to be matched with each other, and each liquid crystal panel is securely fixed to the apparatus housing, and sufficient mounting accuracy is obtained. Need to get. Therefore, the liquid crystal panel is housed in a hard case, and the case is attached to the apparatus housing.
[0008]
FIG. 13 is an explanatory view showing a state in which the liquid crystal panel to which the FPC is attached is housed in a case. FIG. 13A shows a planar shape, and FIG. 13B shows a cross-sectional shape.
[0009]
The case 81 is a housing having an open top surface, and the bottom surface shape is substantially the same as the element substrate 83 of the liquid crystal panel 82. The liquid crystal panel 82 is placed on the bottom surface in the case 81 with the counter substrate 84 side facing the bottom surface and the element substrate 83 facing upward. An adhesive 87 is embedded in a gap between the horizontal side surfaces 85 of the element substrate 83 of the liquid crystal panel 82 and the inner wall 86 of the case 81, and the liquid crystal panel 82 is bonded and fixed to the case 81.
[0010]
An opening 88 is formed in the center of the bottom surface of the case 81 so as to correspond to the effective display area of the liquid crystal panel 82, and light incident through the opening 88 is transmitted through the liquid crystal panel 82 from the counter substrate 84 of the liquid crystal panel 82. Then, the light is emitted from the element substrate 83 side. An FPC 89 is fixed to the mounting terminal provided at the end of the element substrate 83 of the liquid crystal panel 82 by pressure.
[0011]
[Problems to be solved by the invention]
By the way, when the liquid crystal panel 82 accommodated in the case 81 is transported or attached to the apparatus, the operator may hold the FPC 89 by hand to support the case 81 and the entire liquid crystal panel 82. Such force applied to the FPC 89 is directly transmitted to the liquid crystal panel 82. However, the liquid crystal panel 82 is only fixed to the case 81 on the side surface 85 of the element substrate 83 with an elastic adhesive 87. When force is applied to the FPC 89, the force is transmitted to the liquid crystal panel 82. The liquid crystal panel 82 may be displaced from the initial position of the bonding due to a force stronger than the bonding force between the liquid crystal panel 82 and the case 81.
[0012]
As described above, in the projector, by fixing the apparatus housing and the case 81, the position of the liquid crystal panel 82 is defined, and the screen positions of the three liquid crystal panels are made to coincide with each other so that a color projection image can be obtained. It has gained. Therefore, when the position shift of the liquid crystal panel 82 with respect to the case 81 due to the external force applied to the FPC 89 occurs, the projected image of each liquid crystal panel shifts, resulting in a fatal display defect.
[0013]
The present invention has been made in view of such problems, and a display device capable of preventing the panel in the case from being displaced from the initial position even when an external force is applied to the flexible printed board, and the display device An object of the present invention is to provide a projection apparatus using the above.
[0014]
[Means for Solving the Problems]
The display device according to the present invention includes a case for housing the display panel, a protrusion provided at the end of the case, and an opening that is connected and fixed to the display panel and into which the protrusion is inserted. A flexible substrate, and the case end is notched in a width direction of the flexible substrate on a surface opposite to the housed display panel with the protrusion interposed therebetween and facing the flexible substrate. The flexible substrate has a cut-out portion, One side is connected and fixed to the display panel, and the other side Bonded to the case with an adhesive filled in the notch The protrusion is deformed from the one surface side between the connecting portion between the flexible substrate and the display panel and the adhesive portion between the flexible substrate and the case, and the flexible substrate Is fixed in pressure contact with the case It is characterized by that.
[0015]
According to such a configuration, the display panel is connected to the flexible substrate. The flexible substrate has an opening, and a protrusion provided at the end of the case is inserted into the opening. The flexible substrate is fixed to the case by the protruding portion, and the position in the case of the display panel connected to the flexible substrate is fixed.
[0016]
A plurality of the protrusions are arranged in parallel in the width direction of the flexible substrate.
[0017]
According to such a configuration, the flexible substrate is securely fixed to the case in the horizontal plane direction by a plurality of juxtaposed portions. Accordingly, the display panel is also accommodated in the case without being displaced in the horizontal plane direction.
[0018]
The protrusion may be caulked to fix the flexible substrate and the case end.
[0019]
According to such a configuration, the flexible substrate and the case end are firmly fixed by caulking the protrusion. Thereby, the position shift in the case of a display panel is prevented reliably.
[0020]
Further, the protrusion is characterized in that the peripheral surface and the surface of the flexible substrate are bonded by an adhesive after the opening portion is inserted.
[0021]
According to such a configuration, since the peripheral surface of the protrusion and the surface of the flexible substrate are bonded by the adhesive, the protrusion is prevented from coming out of the opening portion, and the flexible substrate and the case are fixed. As a result, the display panel is reliably prevented from being displaced in the case.
[0022]
The case end and the flexible substrate may be bonded with an adhesive.
[0023]
According to such a configuration, the case and the flexible substrate are not only fixed by inserting the protruding portion into the opening portion, but also fixed by bonding with an adhesive, and the flexible substrate and the case are fixed. As a result, the display panel is reliably prevented from being displaced in the case.
[0024]
The opening is a positioning opening used when the flexible substrate is connected and fixed to the display panel.
[0025]
According to such a configuration, there is no need to newly provide an opening for attaching the flexible substrate to the protrusion, and a general-purpose product can be used as the flexible substrate, and the degree of freedom in design is improved.
[0026]
The connecting portion of the flexible substrate of the display panel housed in the case may be disposed substantially horizontally with a surface of the case end where the protrusion is formed.
[0027]
According to such a configuration, the flexible substrate is not bent between the case end and the connecting portion of the flexible substrate, and the flexible substrate can be prevented from being damaged.
[0028]
The projection device according to the present invention is characterized by using the display device.
[0029]
According to such a configuration, displacement of the display panel within the case is prevented, and thus the display panel can be reliably positioned by fixing the case to the projection device housing. For example, when applied to a three-plate type projection device, it is possible to prevent a positional shift of the screen position by each display panel and obtain a high-quality image.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a display device according to a first embodiment of the present invention. This embodiment is an example in which the display device is applied to a liquid crystal display device. FIG. 2 is an equivalent circuit diagram of various elements and wirings in a plurality of pixels constituting the pixel region of the liquid crystal device. FIG. 3 is a plan view of an element substrate such as a TFT substrate as viewed from the counter substrate side together with each component formed thereon, and FIG. 4 is an assembly process in which the element substrate and the counter substrate are bonded together to enclose liquid crystal. It is sectional drawing which cut | disconnects and shows the liquid crystal device after completion | finish at the position of the HH 'line | wire of FIG. FIG. 5 is a cross-sectional view showing the liquid crystal device in detail.
[0031]
First, the structure of the liquid crystal panel will be described with reference to FIGS.
[0032]
As shown in FIGS. 3 and 4, the liquid crystal panel is configured by sealing a liquid crystal 50 between an element substrate 10 such as a TFT substrate and a counter substrate 20. On the element substrate 10, pixel electrodes and the like constituting pixels are arranged in a matrix. FIG. 2 shows an equivalent circuit of elements on the element substrate 10 constituting the pixel.
[0033]
As shown in FIG. 2, in the pixel region, a plurality of scanning lines 3a and a plurality of data lines 6a are wired so as to cross each other, and a pixel electrode is formed in a region partitioned by the scanning lines 3a and the data lines 6a. 9a are arranged in a matrix. A TFT 30 is provided corresponding to each intersection of the scanning line 3 a and the data line 6 a, and the pixel electrode 9 a is connected to the TFT 30.
[0034]
The TFT 30 is turned on by the ON signal of the scanning line 3a, whereby the image signal supplied to the data line 6a is supplied to the pixel electrode 9a. A voltage between the pixel electrode 9 a and the counter electrode 21 provided on the counter substrate 20 is applied to the liquid crystal 50. In addition, a storage capacitor 70 is provided in parallel with the pixel electrode 9a, and the storage capacitor 70 makes it possible to hold the voltage of the pixel electrode 9a for a time that is, for example, three orders of magnitude longer than the time when the source voltage is applied. The storage capacitor 70 improves the voltage holding characteristic and enables image display with a high contrast ratio.
[0035]
FIG. 5 is a schematic cross-sectional view of a liquid crystal panel focusing on one pixel.
[0036]
An element substrate 10 such as glass or quartz is provided with a TFT 30 having an LDD structure. The TFT 30 includes a scanning line 3a that forms a gate electrode through an insulating film 2 on a semiconductor layer in which a channel region 1a, a source region 1d, and a drain region 1e are formed. A data line 6 a is stacked on the TFT 30 via the first interlayer insulating film 4, and the data line 6 a is electrically connected to the source region 1 d via the contact hole 5. A pixel electrode 9 a is stacked on the data line 6 a via a second interlayer insulating film 7, and the pixel electrode 9 a is electrically connected to the drain region 1 e via a contact hole 8.
[0037]
When the ON signal is supplied to the scanning line 3a (gate electrode), the channel region 1a becomes conductive, the source region 1d and the drain region 1e are connected, and the image signal supplied to the data line 6a becomes the pixel electrode. 9a.
[0038]
A storage capacitor electrode 1f extending from the drain region 1e is formed in the semiconductor layer. The storage capacitor electrode 1f is disposed so that the capacitor line 3b faces the insulating film 2 as a dielectric film, thereby forming a storage capacitor 70. On the pixel electrode 9a, an alignment film 16 made of polyimide polymer resin is laminated and rubbed in a predetermined direction.
[0039]
On the other hand, the counter substrate 20 is provided with a first light-shielding film 23 in a region facing the data line 6a, scanning line 3a, and TFT 30 formation region of the TFT array substrate, that is, in a non-display region of each pixel. The first light shielding film 23 prevents incident light from the counter substrate 20 side from entering the channel region 1 a, the source region 1 d, and the drain region 1 e of the TFT 30. A counter electrode (common electrode) 21 is formed over the entire surface of the substrate 20 on the first light shielding film 23. An alignment film 22 made of a polyimide-based polymer resin is laminated on the counter electrode 21 and rubbed in a predetermined direction.
[0040]
A liquid crystal 50 is sealed between the element substrate 10 and the counter substrate 20. Thereby, the TFT 30 writes the image signal supplied from the data line 6a to the pixel electrode 9a at a predetermined timing. Depending on the potential difference between the written pixel electrode 9a and the counter electrode 21, the orientation and order of the molecular assembly of the liquid crystal 50 change, and light is modulated to enable gradation display.
[0041]
As shown in FIGS. 3 and 4, the counter substrate 20 is provided with a second light shielding film 42 as a frame for partitioning the display area. The second light shielding film 42 is formed of, for example, the same or different light shielding material as the first light shielding film 23.
[0042]
A sealing material 41 that encloses liquid crystal in a region outside the second light shielding film 42 is formed between the element substrate 10 and the counter substrate 20. The sealing material 41 is disposed so as to substantially match the contour shape of the counter substrate 20, and fixes the element substrate 10 and the counter substrate 20 to each other. The sealing material 41 is missing in a part of one side of the element substrate 10, and a liquid crystal injection port 78 for injecting the liquid crystal 50 is formed in the gap between the bonded element substrate 10 and the counter substrate 20. The After the liquid crystal is injected from the liquid crystal injection port 78, the liquid crystal injection port 78 is sealed with a sealing material 79.
[0043]
A data line driving circuit 61 and a mounting terminal 62 are provided along one side of the element substrate 10 in a region outside the sealing material 41 of the element substrate 10, and scanning lines are provided along two sides adjacent to the one side. A drive circuit 63 is provided. On the remaining side of the element substrate 10, a plurality of wirings 64 are provided for connecting between the scanning line driving circuits 63 provided on both sides of the screen display area. In addition, a conductive material 65 for electrically connecting the element substrate 10 and the counter substrate 20 is provided in at least one corner of the counter substrate 20.
[0044]
The element substrate 10 and the counter substrate 20 are manufactured separately and assembled into a panel in an assembly process. That is, polyimide (PI) to be the alignment films 16 and 22 is applied to the prepared element substrate 10 and counter substrate 20. Next, a rubbing process is performed on the alignment film 16 on the surface of the element substrate 10 and the alignment film 22 on the surface of the counter substrate 20.
[0045]
Next, a cleaning process for removing dust generated by the rubbing process is performed. When the cleaning process is completed, the sealing material 41 and the conductive material 65 (see FIG. 3) are formed. After the sealing material 41 is formed, the element substrate 10 and the counter substrate 20 are bonded together, and the pressure bonding is performed while alignment is performed, and the sealing material 41 is cured. Finally, liquid crystal is sealed from a notch provided in a part of the seal material 41, and the notch is closed to seal the liquid crystal.
[0046]
The FPC is connected to the liquid crystal panel configured as described above and stored in a case. FIG. 1 shows this state, FIG. 1 (a) shows a planar shape, and FIG. 1 (b) shows a cross-sectional shape of FIG. 1 (a).
[0047]
The liquid crystal panel 92 in FIG. 1 is the same as that in FIGS. 2 to 5 and is configured by bonding an element substrate 93 and a counter substrate 94 together. In the liquid crystal panel 92, the FPC 99 is connected to the mounting terminal 62 (see FIG. 3). The FPC 99 is configured by forming a copper foil pattern (not shown) made of, for example, rolled copper foil on a base material such as a polyimide film, and further forming a cover material on the copper foil pattern. The copper foil patterns are juxtaposed along the longitudinal direction of the FPC 99. An ACF (not shown) that is an adhesive containing conductive particles is formed in the width direction of the FPC 99, and the FPC 99 is pressure-bonded and fixed onto the element substrate 93 using this ACF.
[0048]
The case 91 is a housing having an open top surface, and the shape and size of the bottom surface are substantially the same as the element substrate 93 of the liquid crystal panel 92. An opening 88 corresponding to the effective display area of the liquid crystal panel 92 is formed on the bottom surface of the case 91, and the liquid crystal panel 92 is placed on the bottom surface with the counter substrate 94 side facing. A slight gap is provided between the horizontal side surfaces 95 of the element substrate 93 of the liquid crystal panel 92 and the inner walls 86 of the case 91 facing the side surfaces 95 respectively. An adhesive 97 is embedded in the gap, and the adhesive 97 is configured to adhere and fix the liquid crystal panel 92 at a predetermined position in the case 91.
[0049]
In the case 91, the side wall adjacent to the inner wall 86 is configured to be wider than the side wall constituting the inner wall 86, and the FPC 99 attached to the element substrate 93 is not bent on one of the wide side walls. A stepped portion 103 having a thickness corresponding to the thickness of the element substrate 93 is formed so as to be built inside and outside the case 1. The step portion 103 is configured to be slightly wider than the width of the FPC 99 in the direction along the side wall.
[0050]
In the present embodiment, the side wall portion forming the stepped portion 103 is configured by the fixing member 100. The fixing member 100 has protrusions 101 formed at two positions on both ends of the step 103 along the side wall on the step 103. The pair of projecting portions 101 are, for example, in a columnar shape before the FPC 99 is attached, and the tips thereof are deformed into a substantially round head shape as shown in FIG. 1 by caulking work after the FPC 99 is attached.
[0051]
In the FPC 99, the liquid crystal panel 92 is housed in a predetermined position of the case 91, and the position corresponding to the protrusions 101 formed at both ends of the step 103 is in accordance with the shape and size of the protrusion 101 before deformation. A pair of opening portions 102 having a shape and a size are formed.
[0052]
Next, the assembly operation of the display device of FIG. 1 will be described.
[0053]
An FPC 99 is attached to a liquid crystal panel 92 having the same configuration as the liquid crystal panel shown in FIGS. For example, the positions of a mark (not shown) on the liquid crystal panel 92 and a recognition mark (not shown) on the FPC 99 are detected by image recognition or the like, and the liquid crystal panel 92 and the FPC 99 are aligned. Then, the FPC 99 is pressure-bonded and fixed on the element substrate 93 by using ACF at a position where the copper foil pattern of the FPC 99 is connected to the corresponding mounting terminal 62.
[0054]
Next, the liquid crystal panel 92 to which the FPC 99 is connected is placed on the bottom surface in the case 91 with the counter substrate 94 facing the bottom surface. In this case, the two protruding portions 101 provided on the stepped portion 103 of the case 91 are inserted into the two opening portions 102 provided in the FPC 99.
[0055]
In a state where the liquid crystal panel 92 is disposed at a predetermined initial position, an adhesive 97 is embedded in a gap between both the side surface 95 of the element substrate 93 and the inner wall 96 of the case 91. Thereby, the liquid crystal panel 92 is bonded and fixed to a predetermined position in the case 91. Note that the adhesive fixing may be performed by previously applying the adhesive 97 to the case 91 and then placing the liquid crystal panel 92 at a predetermined initial position.
[0056]
Next, a caulking operation is performed in which the tip of the protruding portion 101 protruding from the opening portion 102 of the FPC 99 in the step portion 103 is deformed by heating and pressurizing with a heat caulking machine or the like, for example. By this caulking work, the tip of the protrusion 101 is deformed into, for example, a round head shape, the periphery of the opening 102 of the FPC 99 is pressed against the surface of the step 103, and the FPC 99 is fixed to the step 103.
[0057]
Thus, in this embodiment, not only the liquid crystal panel is fixed to the case with an adhesive, but also the FPC fixed to the liquid crystal panel is fixed to the case by caulking, and the FPC is held by hand. As described above, even when an external force is applied to the FPC, the FPC is fixed to the case by a caulking portion having a large fixing force, so that the initial position of the liquid crystal panel is not shifted by the external force applied to the FPC. .
[0058]
Accordingly, since there is no deviation in the positional relationship between the liquid crystal panel and the case, when the apparatus shown in FIG. 1 is used in a three-plate projector, each case is securely fixed to the apparatus housing. The screen positions of the liquid crystal panels can be matched with each other, and the display quality can be improved.
[0059]
In the above-described embodiment, an example in which heat caulking is performed on the protrusion 101 has been described, but it is not always necessary to perform caulking work. Since the positional deviation of the liquid crystal panel 92 in the horizontal plane becomes a problem, the positional deviation of the liquid crystal panel 92 in the horizontal plane with respect to the case 91 can be reliably detected only by inserting the protrusions 101 arranged in parallel with the opening 102. Can be prevented. Further, if the diameter of the protruding portion 101 and the diameter of the opening portion 102 of the FPC 99 are appropriately set, the FPC 99 and the case 91 can be sufficiently fixed only by inserting the protruding portion 101 into the opening portion 102. .
[0060]
Further, the present embodiment has an advantage that the FPC wiring pattern can be prevented from cracking. Further, there is an advantage that it is possible to prevent the adhesion surface of the liquid crystal panel of the FPC from being peeled off.
[0061]
FIG. 6 is an explanatory view showing a second embodiment of the present invention. 6A shows the top surface shape, FIG. 6B shows the side cross-sectional shape, and FIG. 6C shows the back surface shape. In FIG. 6, the same components as those in FIG. In this embodiment, a fixing member for caulking and fixing a flexible printed board to a case is provided.
[0062]
A liquid crystal panel 92 is accommodated in the case 109. In the mounting terminal 62 (see FIG. 3) portion of the liquid crystal panel 92, the FPC 121 is fixed by crimping. The FPC 121 has substantially the same configuration as the FPC 99 in FIG. In the present embodiment, the FPC 121 has a positioning opening 122 used for positioning at the time of pressure bonding to the liquid crystal panel 92 formed in the width direction of the FPC 99.
[0063]
Dustproof glasses 112 and 111 are attached to the element substrate 93 and the counter substrate 94 of the liquid crystal panel 92, respectively. The inside of the case 109 is configured to have a shape that substantially matches the shapes of the liquid crystal panel 92 and the dust-proof glasses 111 and 112 that are bonded together. The liquid crystal panel 92 and the dust-proof glasses 111 and 112 bonded together by an adhesive (not shown) are bonded and fixed inside the case 109.
[0064]
In the state where the bonded liquid crystal panel 92 and dust-proof glass 111 and 112 are housed in the case 109, the upper surface opening portion of the case 109 is closed by the hook 113. The hook 113 has an opening corresponding to the effective display area of the element substrate 93. The case 109 also has an opening corresponding to the effective display area of the element substrate 93 on the surface opposite to the hook 113 mounting surface.
[0065]
The frame 114 forming the outer shape of the case 109 is configured such that the longitudinal side wall of the FPC 121 is wider than the lateral side wall, and the FPC 121 attached to the element substrate 93 is attached to one of the wide side walls. A stepped portion 117 having a thickness corresponding to the thickness of the dust-proof glass 111 and the counter substrate 94 is formed so as to be installed inside and outside the case 109 without being bent. Using this stepped portion 117, the FPC 121 is arranged without being bent.
[0066]
In the present embodiment, a flat plate-like fixing member 115 (hatched portion in FIG. 6A) protruding from the frame 114 in the longitudinal direction of the FPC 121 is attached to the side wall of the frame 114 having the stepped portion 117. . The fixing member 115 is provided along the frame 114 and has the same thickness as the stepped portion 117. Accordingly, the FPC 121 is provided along the surface of the stepped portion 117 and the fixing member 115.
[0067]
The fixing member 115 has two protrusions 116 arranged side by side in the width direction of the FPC 121 on the side where the FPC 121 is disposed. The protrusion 116 accommodates the liquid crystal panel 92 in a predetermined position of the case 109 and is positioned at a position corresponding to the positioning opening 122 of the FPC 121 in a state where the FPC 121 is along the surface of the stepped portion 117 and the fixing member 115. It is formed. The shape and size of the protrusion 116 correspond to the shape and size of the aperture 122.
[0068]
FIG. 6 shows a state immediately after the protrusion 116 is inserted into the opening 122 of the FPC 121. As shown in FIG. 6, the pair of protrusions 116 has, for example, a cylindrical shape, and the tip is deformed into a substantially round head shape by caulking work after the FPC 121 is attached.
[0069]
In the embodiment configured as described above, the same assembling work as in the first embodiment is performed.
[0070]
That is, first, the FPC 121 is attached to the liquid crystal panel 92. In this case, the liquid crystal panel 92 and the FPC 121 are aligned using the opening 122 on the FPC 121. Then, the FPC 121 is pressure-bonded and fixed onto the element substrate 93 by using ACF at a position where the copper foil pattern of the FPC 121 is connected to the corresponding mounting terminal 62.
[0071]
Next, the dust-proof glass 111, the liquid crystal panel 92, and the dust-proof glass 112 are sequentially arranged at predetermined positions inside the case 109 and bonded and fixed. In this case, the two protrusions 116 provided on the fixing member fixed to the frame 114 are inserted into the two openings 122 provided in the FPC 121. Next, the opening of the case 109 is closed by the hook 113.
[0072]
Next, a caulking operation is performed in which the tip of the protruding portion 116 protruding from the opening portion 122 of the FPC 121 in the fixing member 115 is deformed by heating and pressing with, for example, a heat caulking machine or the like. By this caulking operation, the tip of the projection 116 is deformed into a predetermined shape, and the periphery of the opening 122 of the FPC 121 is pressed against the surface of the fixing member 115 to fix the FPC 121 to the fixing member 115.
[0073]
Thus, in the present embodiment, the FPC is fixed to the fixing member fixed to the case by the caulking process using the positioning opening provided in the FPC. Similarly, even when an external force is applied to the FPC, the initial position of the liquid crystal panel can be prevented from shifting. Conventionally, the FPC has an opening portion for positioning, and the FPC has an advantage that a conventionally used FPC can be adopted.
[0074]
Further, in the above-described embodiment, it is possible to reliably prevent displacement of the liquid crystal panel 92 in the horizontal plane with respect to the case 109 even if the protrusion 116 is inserted into the opening 122 without performing caulking work. it can. Further, the FPC 121 and the case 109 can be sufficiently fixed by appropriately setting the diameter of the protrusion 116 and the diameter of the opening 122 of the FPC 121 and performing an interference fit.
[0075]
FIG. 7 is an explanatory view showing a third embodiment of the present invention. In FIG. 7, the same components as those in FIG. FIGS. 7A to 7C correspond to FIGS. 6A to 6C, respectively. In this embodiment, a fixing member for caulking and fixing a flexible printed board is provided on a step portion of the frame side wall.
[0076]
The case 125 is different from the case 109 in FIG. 6 in that the fixing member 127 that fixes the FPC 130 does not protrude from the frame 126. That is, the frame 126 has the same outer shape as the frame 114 of FIG. 6, and has a step portion 129 having the same configuration as the step portion 117 of FIG. A fixing member 115 is used on the side wall portion of the frame 126 constituting the step portion 129.
[0077]
The fixing member has a pair of projecting portions 128 projecting toward the FPC 130 at the step portion 129. The pair of protrusions 128 are provided at the ends in the width direction of the FPC 130, that is, at both ends of the stepped portion 129.
[0078]
On the other hand, the FPC 130 is in a state where the liquid crystal panel 92 and the dust-proof glasses 111 and 112 are housed in predetermined positions of the case 125, at positions corresponding to the protrusions 128 formed at both ends of the step 129 before the deformation of the protrusion 128. 6 is different from the FPC 121 of FIG. 6 in that a pair of apertures 131 having a shape and size corresponding to the shape and size of the FPC 121 are formed.
[0079]
In the embodiment configured as described above, the same assembling work as in the second embodiment is performed. Only the position where the FPC 130 is fixed by caulking work is different.
[0080]
Thus, also in this embodiment, the same effect as that of the first embodiment can be obtained. It should be noted that the caulking work is not necessarily required also in the present embodiment.
[0081]
By the way, although the caulking process of the protrusions has been described as being performed by heating, the caulking process can be performed by other methods. For example, when the protrusion is made of resin, the caulking work is performed by heat treatment, but when the protrusion is made of metal, the caulking work is performed by a press using plastic working.
[0082]
FIG. 8 and FIG. 9 are explanatory views for explaining an FPC fixing method suitable for caulking work by a press. The left side of FIGS. 8 and 9 shows the cross-sectional shape, and the right side shows the shape viewed from the top. 8 and 9A show the state before the caulking work, and FIGS. 8 and 9B show the state after the caulking work. 8 and 9 can be applied to the above embodiments.
[0083]
FIG. 8A shows a state in which the protrusion 141 of the fixing member 140 is inserted into the opening 142 provided in the FPC. In this state, the crimping operation is performed by pressing the tip of the protrusion 141. As a result, as shown in FIG. 8B, the tip of the protrusion 141 is deformed into a round head-shaped fixing part 143 wider than the opening 142. The periphery of the opening portion 142 of the FPC is pressed and fixed to the fixing member 140 by the fixing portion 143.
[0084]
FIG. 9A shows a state in which the protrusion 151 of the fixing member 150 is inserted into the opening 142 provided in the FPC. The protrusion 151 has a hollow cylindrical shape. In this state, the crimping operation is performed by pressing the tip of the protrusion 151. As a result, as shown in FIG. 9B, the tip of the protrusion 151 is bent to the FPC surface side and is deformed into a fixing portion 153 having a width wider than the opening 142. The periphery of the opening portion 142 of the FPC is pressed and fixed to the fixing member 150 by the tip of the fixing portion 153.
[0085]
As described above, in consideration of preventing the positional deviation in the horizontal plane of the liquid crystal panel, it is not always necessary to perform a caulking operation on the protruding portion inserted into the opening portion of the FPC. However, when the caulking operation is not performed, it is better to prevent the protruding portion from coming off from the opening portion of the FPC. 10 and 11 are explanatory diagrams for explaining the bonding method in this case.
[0086]
FIG. 10 shows a state where the protrusion 141 of the fixing member 140 is inserted into the opening 142 provided in the FPC. In this state, the peripheral surface of the protrusion 141 and the vicinity of the opening portion 142 of the FPC are bonded and fixed with an adhesive 155. Thereby, it can prevent that the opening part 142 remove | deviates from the projection part 141, and FPC is no longer fixed to the fixing member 140. FIG.
[0087]
Before applying the adhesive 155 of FIG. 10, it is conceivable that the washer 157 with the dovetail groove shown in FIG. 11 is fitted into the protrusion 141. By applying the adhesive 155 with the washer 157 fitted, the adhesive 155 enters the dovetail groove, and the adhesive strength between the protrusion and the periphery of the FPC opening 142 is improved.
[0088]
FIG. 12 is an explanatory view showing a fourth embodiment of the present invention. Fig.12 (a) respond | corresponds to FIG.1 (b), FIG.12 (b) has shown the back surface shape. In FIG. 12, the same components as those of FIG. In this embodiment, the adhesive strength between the FPC and the case is improved by an adhesive.
[0089]
The case 160 is different from the case 91 of the first embodiment in that a fixing member 161 is used instead of the fixing member 100 of FIG. The fixing member 161 is different from the fixing member 100 in that an upper surface end portion in contact with the FPC 99 is notched in the width direction of the FPC 99.
[0090]
In the present embodiment, the adhesive 162 is filled in the notched portion of the fixing member 161. The adhesive 162 is configured to bond and fix the upper end portion of the fixing member 161 of the case 160 and the FPC 99.
[0091]
In the embodiment configured as described above, the FPC 99 and the fixing member 161 are pressed and fixed at the stepped portion 103 by the caulking process of the protruding portion 101, and the FPC 99 and the upper end portion of the fixing member 100 are bonded by the adhesive 162. The FPC 99 is bonded and fixed over the entire width direction.
[0092]
Thereby, stronger adhesive strength can be obtained than in the first embodiment.
[0093]
【The invention's effect】
As described above, according to the present invention, even when an external force is applied to the flexible printed board, it is possible to prevent the panel in the case from being displaced from the initial position.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a display device according to a first embodiment of the invention.
FIG. 2 is an equivalent circuit diagram of various elements and wirings in a plurality of pixels constituting a pixel region of the liquid crystal device.
FIG. 3 is a plan view of an element substrate such as a TFT substrate as viewed from the counter substrate side together with each component formed thereon.
4 is a cross-sectional view of the liquid crystal device after the assembly process in which liquid crystal is sealed by bonding an element substrate and a counter substrate, cut along the line HH ′ of FIG. 3;
FIG. 5 is a cross-sectional view illustrating a liquid crystal device in detail.
FIG. 6 is an explanatory diagram showing a second embodiment of the present invention.
FIG. 7 is an explanatory diagram showing a third embodiment of the present invention.
FIG. 8 is an explanatory diagram for explaining an FPC fixing method suitable for caulking work by a press.
FIG. 9 is an explanatory diagram for explaining an FPC fixing method suitable for caulking work by a press.
FIG. 10 is an explanatory diagram for explaining a bonding method between an opening and a protrusion.
FIG. 11 is an explanatory diagram for explaining a bonding method between an opening and a protrusion.
FIG. 12 is an explanatory diagram showing a fourth embodiment of the present invention.
FIG. 13 is an explanatory diagram showing a conventional display device.
[Explanation of symbols]
91 ... Case
92 ... LCD panel
93 ... Element substrate
94 ... Counter substrate
99 ... FPC
100: Fixing member
101 ... Projection
102 ... opening part
103 ... Step

Claims (7)

A case for storing the display panel;
A protrusion provided at the end of the case;
A flexible substrate having a hole portion into which the projection portion is inserted and fixedly connected to the display panel;
The case end has a notch cut out in the width direction of the flexible substrate on a surface opposite to the housed display panel with the protrusion interposed therebetween and facing the flexible substrate. And
The flexible substrate has one surface connected and fixed to the display panel, and the other surface is bonded to the case with an adhesive filled in the notch ,
The protrusion is deformed at the tip from the one surface side between the connecting portion between the flexible substrate and the display panel and the adhesive portion between the flexible substrate and the case, and the flexible substrate is moved into the case. A display device, characterized in that the display device is fixed by pressure contact .   The display device according to claim 1, wherein a plurality of the protrusions are arranged in parallel in the width direction of the flexible substrate.   The display device according to claim 1, wherein the protrusion is caulked to fix the flexible substrate and the case end.   2. The display device according to claim 1, wherein after the opening portion is inserted, the peripheral surface and the surface of the flexible substrate are bonded to each other by an adhesive.   The display device according to claim 1, wherein the opening is a positioning opening used when the flexible substrate is connected and fixed to the display panel.   The display according to claim 1, wherein the connection portion of the flexible substrate of the display panel housed in the case is disposed substantially horizontally with a surface of the case end portion on which the protrusion is formed. apparatus. Projection apparatus characterized by using a display device according to any one of claims 1 to 6.

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