JP2007322728A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a driving substrate from warping when attaching and after attaching the driving substrate of a display apparatus to a supporting frame. <P>SOLUTION: The driving substrate connected to a display panel via a flexible circuit material is held on an outer peripheral surface, a display side circumferential part, or a rear surface of non-display side of the supporting frame of the display panel using screws; the screws fix their axial parts by inserting the tip parts of the axial parts into fitting parts prepared in the supporting frame through fitting holes in the driving substrate; while the height of the axial parts projecting from the supporting frame is made higher than the plate thickness of the driving substrate, to provide clearances between the heads of the screws and the driving substrate, the outer diameters of the axial parts of the screws are made smaller than the inner diameters of the fitting holes in the driving substrate, to provide clearances by loosely fitting; and thus the driving substrate held by the screws is made movable due to the clearances. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a positioning and holding structure for a support frame of a driving substrate made of a source substrate and / or a gate substrate connected to a display panel via a flexible circuit material.

Conventionally, a display panel of a liquid crystal display device generally controls liquid crystal alignment by sealing a liquid crystal between an array substrate made of a glass substrate provided with a transparent electrode and a color filter substrate, and applying a driving voltage to the transparent electrode. Yes.
In the display panel shown in FIG. 11 disclosed in Japanese Patent Laid-Open No. 10-274493 (Patent Document 1) and the like, the source substrate 4 and the gate substrate 5 are connected to the array substrate 1 of the display panel via the flexible circuit members 2 and 3. These drive substrates are connected to each other, and these drive substrates are fixed to the support frame 6 with screws B along the periphery of the display panel.

  However, there may be a dimensional error between the distance between the through holes for screw insertion provided in the drive board and the distance between the bolt holes provided in the support frame 6. When screwing and fixing to 6, the through hole and the bolt hole are forcibly aligned to cause a phenomenon in which the central portion of the drive substrate warps upward. In this state, as shown in FIG. 15, when the bezel 7 constituting the outer frame of the display device is covered, the driving substrate comes into contact with the metal bezel 7 that covers the upper portion, and is electrically connected or mounted on the driving substrate. The problem that the electronic component 8 is damaged tends to occur.

Therefore, among the mounting holes of the drive board, one of the mounting holes has an elliptical or oval shape with the longitudinal direction of the drive board as the major axis direction, and the interval between the mounting holes of the drive board and the screw holes of the support frame Some of them absorb the dimensional error with the interval.
However, if the oval or oval mounting hole side is first screwed and fixed to the support frame, the perfect mounting hole and the screw hole of the support frame may be misaligned. When tightening is performed, the center portion in the longitudinal direction of the drive substrate warps upward as described above.

  In many cases, the drive substrate and the support frame 6 are formed of materials having different coefficients of thermal expansion. In this case, the drive substrate expands more than the support frame due to an increase in ambient temperature during use. As a result, the center of the drive substrate is warped and the drive substrate is likely to come into contact with the bezel 7 as described above.

Japanese Patent Application Laid-Open No. 10-249443

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent the drive substrate from being warped during and after the drive substrate is attached to the support frame.

In order to solve the above-mentioned problems, the present invention provides a driving substrate connected to a display panel through a flexible circuit material, and screws on the outer peripheral surface, the display-side peripheral portion or the non-display-side back surface of the support frame of the display panel. Using and holding
The screw inserts and fixes the shaft portion through the mounting hole of the drive board, the tip portion of the shaft section to the mounting portion provided on the support frame, and the height of the shaft portion protruding from the support frame is set to the height of the drive board. A gap is provided between the screw head and the drive board so as to be larger than the plate thickness, and the outer diameter of the screw shaft is loosely fitted to be smaller than the inner diameter of the mounting hole of the drive board. The display device is characterized in that the drive substrate held by the screw is movable through the gap.

The driving substrate held on the support frame by the screws is a source substrate or / and a gate substrate, or a source / control integrated substrate having both functions of the source substrate and the gate substrate.
According to the above configuration, since the drive board is held by the support frame with a gap between the screw head and the shaft portion between the mounting hole of the drive board, the drive board has a dimension corresponding to the gap. It becomes movable with respect to the support frame. Therefore, align the mounting hole with the mounting part of the support frame by moving the driving board slightly when aligning the other mounting holes of the driving board with the mounting part on the support frame side and attaching to the support frame through screws. Can do. As a result, it is possible to prevent warping of the drive board that occurs when the drive board is attached to the support frame in a misaligned state, thereby preventing interference between the drive board and other external members such as a bezel. Can do.

In addition, even if the drive substrate is thermally expanded larger than the support frame due to an increase in ambient temperature, the drive substrate and the support frame have a coefficient of thermal expansion because the elongation due to the thermal expansion can be absorbed by the gap. There is no need to use a material with a small difference.
In addition, since the warpage of the drive substrate due to thermal expansion can be prevented, the distance between the drive substrate attached to the support frame and other members such as a bezel that covers the drive substrate can be reduced, and the display device can be reduced in size or thickness. can do.
Note that the size of the gap varies depending on the thermal expansion coefficient of the drive substrate.

The shaft portion of the screw has a two-stage shape, a tip portion inserted and fixed to the mounting portion in the support frame is a small diameter screw portion, and a screw head side protruding from the support frame is a large diameter portion,
The mounting portion of the support frame is a screw hole, and the small diameter screw portion is screwed and fixed to the screw hole, and the step surface between the small diameter screw portion and the large diameter portion is contacted and fixed to the surface of the support frame. It is preferable.

According to the said structure, if the level | step difference surface provided in the axial part of the said screw | screw is tightened to the position which contact | abuts the surface of a support frame, it cannot be screwed any more. Therefore, even if the screw tightening depth is not taken into consideration, when the screw is tightened to the position where it can be tightened, a gap is surely provided between the lower surface of the screw head and the upper surface of the drive board, thereby facilitating the screw tightening operation. can do.
In addition, while the screw is not provided on the outer peripheral surface of the small end portion of the screw shaft portion, the mounting portion on the support frame side is a concave groove, and the inner diameter of the groove is about the same as the outer diameter of the small end portion of the screw shaft portion. As such, it may be press-fitted and fixed in the concave groove of the support frame.

It is preferable that the mounting hole of the drive board that is loosely fitted to the screw shaft portion is an ellipse or an ellipse having a large longitudinal direction of the long drive board.
Since the drive board thermally expands greatly in the longitudinal direction, if a gap between the screw shaft and the mounting hole of the drive board is provided in the longitudinal direction of the drive board, the gap between the drive board and the support frame is heated by the gap. The difference in expansion can be sufficiently absorbed.

  It is preferable that all the mounting holes including the mounting holes provided at least on both sides in the longitudinal direction of the long drive substrate are the mounting holes that are loosely fitted to the shaft portions of the screws.

Further, the mounting hole is provided on one side in the longitudinal direction of the long drive board and is loosely fitted to the shaft portion of the screw, while the other side in the longitudinal direction of the drive board is provided on the drive board. The drive board may be fastened and fixed to the support frame through a screw through the mounting hole.
In this case, when the drive board is attached to the support frame, if the screw on the other side is fastened and fixed to the support frame and then the screw is loosely fitted into the attachment hole of the drive board, the occurrence of misalignment can be prevented.
Therefore, when the drive board is attached to the support frame via the screws, warpage of the drive board can be prevented, and elongation during thermal expansion can be absorbed by the gap. Furthermore, the screw is fastened and fixed to the support frame on one side, so that the positioning and holding of the drive board can be performed more reliably.

As described above, according to the present invention, since the drive substrate is movably held by the support frame by the biz, when the thermal expansion coefficient of the drive substrate is larger than the thermal expansion coefficient of the support frame, elongation occurs. In addition, the space between the screw shaft and the head and the mounting hole of the drive board can absorb the elongation due to the thermal expansion of the drive board, and can prevent the drive board from warping.
In addition, when the drive board is attached to the support frame using screws, the drive board can be moved to align the mounting hole of the drive board with the attachment portion of the support frame. As a result, it is possible to prevent the warpage of the drive board caused by forcibly screwing the screw into the mounting hole of the drive board and the mounting portion of the support frame through screws, and between the drive board and other external members such as the bezel. Interference can be prevented.

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
The display device of the present invention includes a liquid crystal display device, and the display panel has a liquid crystal sealed between an array substrate made of a glass substrate and a color filter substrate 13, and the array substrate includes a plurality of source lines 11 and gate lines 12. The TFT substrate 10 is provided with thin film transistors arranged in a perpendicular manner.

As shown in FIG. 3, a driving substrate composed of a source substrate 30 and a gate substrate 31 is attached to the periphery of the TFT substrate 10 via a plurality of flexible circuit materials 20 and 24 composed of a flexible film substrate. .
The flexible circuit material 20 includes a wiring 22 and a driver IC 23 on the film substrate 21, and connects the source line 11 of the TFT substrate 10 and the conductor pattern 32 of the source substrate 30 via the wiring 22.
Similarly, the flexible circuit material 24 is also provided with a wiring 26 and a driver IC 27 on the film substrate 25, and the gate line 12 of the TFT substrate 10 and the conductor pattern of the gate substrate 31 are connected via the wiring 26.

  Both the source substrate 30 and the gate substrate 31 are made of an epoxy resin printed substrate, and the support frame 40 attached to the peripheral edge of the TFT substrate 10 is made of aluminum, iron, polycarbonate, or the like. In this embodiment, it is made of aluminum. is doing. The source substrate 30 and the gate substrate 31 are positioned and held on the support frame 40 using screws 50. The thermal expansion coefficients of the epoxy resin constituting the source substrate 30 and the gate substrate 31 are 16 ppm / ° C., and the thermal expansion coefficients of aluminum, iron, and polycarbonate constituting the support frame 40 are 23.8 ppm / ° C. and 11.8 ppm / ° C., respectively. ° C and 70 ppm / ° C.

Since the holding structure of the source substrate 30 and the gate substrate 31 is the same, the holding structure of the source substrate 30 will be described below.
The source substrate 30 is a printed circuit board in which a conductor pattern 32 is provided on an insulating substrate made of epoxy resin, and an electronic component 33 such as a capacitor, resistor, or diode is mounted on the conductor pattern. In this embodiment, the source substrate 30 has a long length in the length direction X along the length direction of the support frame 40 and a short length in the width direction Y perpendicular to the length direction X, and has a rectangular shape. In some cases, the length direction X is large and the width direction Y is small in any of the source substrates. ing.

On both sides of the source substrate 30 in the longitudinal direction X, a perfect circular mounting hole 30a for passing the screw 50 is provided.
As shown in FIG. 2, the screw 50 passing through the mounting hole 30a of the source substrate 30 has a screw shaft portion 50a having a two-step shape and is provided with a step surface 50a-1, and the screw head portion 50b side is connected to the large diameter portion 50a. -2, The tip side is made into the small diameter screw part 50a-3. The large-diameter portion 50 a-2 has an outer diameter R 1 that is smaller than an inner diameter R 2 of the mounting hole 30 a of the source substrate 30, and an axial height L 1 that is greater than the plate thickness L 2 of the source substrate 30. The screw head 50b has a diameter larger than the inner diameter R2 of the mounting hole 30a.

On the other hand, a screw hole 40 a is provided on the outer peripheral surface of the support frame 40 at a position opposite to the mounting hole 30 a of the source substrate 30. The screw hole 40a is sized to screw the small diameter screw portion 50a-3 of the screw 50, and is provided in a concave shape without penetrating the support frame 40.
The tip end side of the screw 50 is not a small-diameter screw portion and is a small-diameter portion not provided with a screw. On the other hand, instead of the screw hole 40a on the support frame 40 side, a circular groove having an inner diameter for press-fitting the small-diameter portion is used. Also good.

  When the source substrate 30 is attached to the support frame 40, the flexible circuit material 20 connecting the TFT substrate 10 and the source substrate 30 is moved along the outer edge of the TFT substrate 10 as shown in FIGS. 1 and 4. The source substrate 30 is aligned with the outer peripheral surface of the support frame 40. At this time, the screw holes 40a provided in the support frame 40 and the mounting holes 30a of the source substrate 30 are arranged to face each other.

As shown in FIG. 2A, the screw shaft portion 50a of the screw 50 is passed through the mounting hole 30a of the source substrate 30, and the screw 50 is moved until the stepped surface 50a-1 of the screw shaft portion 50a contacts the surface of the support frame 40. The small diameter screw portion 50 a-3 is fastened to the screw hole 40 a of the support frame 40.
In this state, a clearance S1 is provided between the outer peripheral surface of the large-diameter portion 50a-2 of the shaft portion 50a of the screw 50 and the inner peripheral surface of the mounting hole 30a of the source substrate 30, and is loosely fitted. A gap S <b> 2 is also provided between the lower surface of the head 50 b and the upper surface of the source substrate 30.
After that, a bezel 41 constituting the outer frame of the liquid crystal display device is attached so as to cover the front side peripheral edge of the display panel and the outer peripheral surface of the support frame 40, and the source is formed on the outer peripheral surface 41 b of the bezel 41 as shown in FIG. The substrate 30 is covered.

According to the above-described configuration, the gap S2 exists between the lower surface of the head 50b of the screw 50 in which the driving substrate including the source substrate 30 and the gate substrate 31 is screwed to the support frame 40, and the upper surface of the driving substrate. The substrate is not firmly fixed to the support frame 40.
Therefore, even if only one side is screwed with the bis 50 and the mounting hole 30a on the unscrewed side and the screw hole 40a on the support frame 40 are misaligned, the screw shaft on the side screwed first The mounting holes 30a and the screw holes 40a are aligned by moving the substrates 30 and 31 with respect to the support frame 40 within a gap S1 provided between the outer peripheral surface of the portion 50a and the inner peripheral surface of the mounting hole 30a. And can be screwed. Accordingly, the warpage of the substrates 30 and 31 caused by forcibly screwing the mounting holes 30a of the substrates 30 and 31 and the screw holes 40a of the support frame 40 through the screws 50 can be prevented. Can be prevented, and the substrates 30 and 31 can be prevented from conducting with the bezel 41 and the electronic components 33 on the substrate can be prevented from being damaged.

Further, even after the substrates 30 and 31 are attached to the support frame 40 with the biz 50, a gap S2 is provided between the lower surface of the screw head 50b and the upper surfaces of the substrates 30 and 31, thereby supporting the substrates 30 and 31 with the support frame. Since the inner peripheral surfaces of the mounting holes 30a of the substrates 30 and 31 and the screw shaft portions 50a of the screws 50 fixed to the support frame 40 interfere with each other, the substrates 30 and 31 are thermally expanded. No warping occurs. That is, the difference in thermal expansion coefficient between the substrates 30 and 31 and the support frame 40 can be absorbed by the gap S1 provided between the outer peripheral surface of the screw shaft portion 50a and the inner peripheral surface of the mounting hole 30a. Can be prevented.
In this embodiment, the screw insertion holes 30a are provided only on both sides of the substrates 30 and 31 in the longitudinal direction. However, when the substrates 30 and 31 are long, the mounting holes 30a are also located at the center in the longitudinal direction. A mounting hole may be provided.

In this embodiment, the drive substrate is a source substrate and a gate substrate, but a source / control integrated substrate having both the function of the source substrate and the function of the gate substrate may be used.
Furthermore, in this embodiment, the flexible circuit material 20 that connects the TFT substrate 10 and the source substrate 30 is bent to the outer peripheral surface side of the support frame 40 and the source substrate 30 is disposed on the outer peripheral surface of the support frame 40. As shown in FIG. 5A, the source substrate 30 may be arranged on the display side surface of the support frame 40 without bending the flexible circuit material 20. Furthermore, as shown in FIG. 5B, the flexible circuit material 20 may be folded back along the outer edge on the back surface side of the support frame 50 and disposed on the back surface on the opposite side of the support frame 40.

6 and 7 show a second embodiment of the present invention.
In the present embodiment, the mounting hole 30b provided in the source substrate 30 has an oval shape in which the longitudinal direction X of the source substrate 30 is the major axis direction. The diameter of the mounting hole 30b in the major axis direction is made significantly larger than the diameter of the large diameter part 50a-2 of the screw shaft part 50a, while the diameter of the mounting hole 30b in the short axis direction Y is larger than that of the screw shaft part 50a. The diameter is slightly larger than the diameter of the diameter portion 50a-2.
Therefore, with the source substrate 30 attached to the support frame 40 via the screws 50, as shown in FIG. 7A, a large gap S1 in the longitudinal direction X of the source substrate 30 with respect to the screw shaft portion 50a. Is provided. On the other hand, the length in the minor axis direction Y of the mounting hole 30b is only slightly larger than the diameter of the screw shaft portion 50a, and as shown in FIG. In the short direction Y of the substrate 30, no large gap is provided between the outer peripheral surface of the screw shaft portion 50a and the inner peripheral surface of the mounting hole 30b.

According to the above configuration, since the source substrate 30 can be moved in the longitudinal direction X of the source substrate 30 having a large thermal expansion amount, but is hardly moved in the short direction Y, the warping of the source substrate 30 is prevented. While preventing, it can also prevent rattling.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
Further, in the present embodiment, the mounting hole 30b of the source substrate 30 has an elliptical shape, but as shown in FIG. 8, it may have an elliptical shape with the long direction of the source substrate 30 as the major axis direction.

FIG. 9 shows a third embodiment of the present invention.
In this embodiment, one mounting hole 30a of the source substrate 30 is screwed through the same screw 50 as in the first embodiment, while the other mounting hole has a height in the axial direction of a larger diameter portion than the screw 50. Is screwing a short screw 51. Specifically, the axial height L1 of the large diameter portion 51a-2 provided on the shaft 51a of the screw 51 is substantially equal to the thickness L2 of the source substrate 30, and the shaft 51a of the screw 51 is attached to the mounting hole 30a. When the screw is tightened to a position where the step surface 51 a-1 comes into contact with the surface of the support frame, the lower surface of the screw head 51 b is pressed against the upper surface of the source substrate 30, and the source substrate 30 is fixed to the support frame 40. That is, in this embodiment, no gap is provided between the lower surface of the screw head 51 b and the upper surface of the source substrate 30.

Also with the above configuration, the source substrate 30 can be prevented from warping during and after the source substrate 30 is screwed to the support frame 40, and the source substrate 30 is fixed to the support frame 40 with the screw head 51 b of the screw 51. Therefore, the play of the source substrate 30 can be prevented.
The mounting hole through which the screw 51 is passed may be substantially the same diameter as the large-diameter portion 51a-2 of the screw 51, and there may be little gap between the outer peripheral surface of the screw shaft portion 51a and the inner peripheral surface of the mounting hole. Good.

  In any of the above-described embodiments, the small diameter portion on the distal end side of the screw is a screw portion. However, the mounting portion on the support frame side may be press-fitted and fixed as a small diameter concave portion without providing a screw, or the distal end of the screw may be It may be sharpened like a pin and inserted into the support frame and fixed. Even in that case, a step surface is provided between the screw insertion portion and the head side to position the screw.

FIG. 10 shows a fourth embodiment of the present invention.
In this embodiment, the shape of the screw for screwing and holding the source substrate 30 to the support frame 40 is different from that of the previous embodiment, and no step surface is provided on the screw shaft portion 52 a of the screw 52. Specifically, the axial height L3 of the shaft portion 52a of the screw 52 is larger than the total L4 of the depth of the screw hole 40a of the support frame 40 and the thickness of the source substrate 30, and the diameter R3 of the shaft portion 52a. Is smaller than the diameter R2 of the mounting hole 30a of the source substrate 30.
Thus, with the screw 52 tightened until the tip of the shaft portion 52a of the screw 52 reaches the bottom of the screw hole 40a of the support frame 40, the gap S1 is formed between the outer peripheral surface of the shaft portion 52a and the inner peripheral surface of the mounting hole 30a. And a gap S <b> 2 is provided between the lower surface of the screw head 52 b and the upper surface of the source substrate 30.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

It is a schematic perspective view which shows the state which positioned and hold | maintained the drive board of 1st Embodiment of this invention to the support frame. The holding structure to the support frame of a source substrate is shown, (A) is a principal part expanded sectional view, (B) is a schematic sectional drawing. It is drawing which shows the TFT substrate which attached the source substrate and the gate substrate. It is the schematic which shows the state which positioned and hold | maintained the source substrate to the support frame. (A) (B) is drawing which shows the modification of 1st Embodiment. It is drawing which shows the source substrate of 2nd Embodiment. The state which hold | maintained the source board to the support frame by screwing is shown, (A) is sectional drawing of the elongate direction of a source board, (B) is sectional drawing of a transversal direction. It is drawing which shows the source substrate of the modification of 2nd Embodiment. It is drawing which shows 3rd Embodiment. It is drawing which shows 4th Embodiment. It is drawing which shows a prior art example. It is drawing which shows the conventional problem.

Explanation of symbols

10 TFT substrate 30 Source substrate 30a, 30b Mounting hole 31 Gate substrate 40 Support frame 40a Screw hole 50 Screw 50a Shaft portion 50a-1 Stepped surface 50a-2 Large diameter portion 50a-3 Small diameter screw portion 50b Head X Longitudinal direction Y Short direction

Claims (5)

The drive board connected to the display panel via a flexible circuit material is held using screws on the outer peripheral surface of the support frame of the display panel, the display side peripheral edge or the reverse side of the display side,
The screw inserts and fixes the shaft portion through the mounting hole of the drive board, the tip portion of the shaft section to the mounting portion provided on the support frame, and the height of the shaft portion protruding from the support frame is set to the height of the drive board. A gap is provided between the screw head and the drive board so as to be larger than the plate thickness, and the outer diameter of the screw shaft is loosely fitted to be smaller than the inner diameter of the mounting hole of the drive board. And the drive board held by the screw is movable through the gap. The shaft portion of the screw has a two-stage shape, a tip portion inserted and fixed to the mounting portion in the support frame is a small diameter screw portion, and a screw head side protruding from the support frame is a large diameter portion,
The mounting portion of the support frame is a screw hole, and the small diameter screw portion is screwed and fixed to the screw hole, and the step surface between the small diameter screw portion and the large diameter portion is contacted and fixed to the surface of the support frame. The display device according to claim 1.   3. The display device according to claim 1, wherein the mounting hole of the driving board that is loosely fitted to the shaft portion of the screw is an ellipse or an ellipse having a large longitudinal direction of the long driving board.   4. The mounting hole according to claim 1, wherein all mounting holes including mounting holes provided at least on both sides in the longitudinal direction of the long drive board are used as the mounting holes for loosely fitting the screw shaft portions. 5. Display device.   The mounting hole is provided on one side in the longitudinal direction of the long drive board and is loosely fitted on the shaft portion of the screw, while the attachment provided on the drive board is provided on the other side in the longitudinal direction of the drive board. The display device according to claim 1, wherein a driving substrate is fastened and fixed to the support frame through a screw through the hole.

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