JP2011002748A - Liquid crystal display device - Google Patents

Abstract

An upper and lower metal frame can be firmly fitted together, and the upper and lower metal frames can be easily detached.
An upper frame is configured such that the claw portions formed on the respective side walls are bent downward as viewed from the liquid crystal display panel side, and the system is secured to the openings formed on the respective side walls of the lower frame. As a result, the liquid crystal display panel is fixed to the lower frame, the direction parallel to one opposite two sides of the liquid crystal display panel is the first direction, and the direction parallel to the other two opposite sides is the second direction. When the distance between the claw portion formed on the side wall along the first direction of the upper frame and the opening formed on the side wall along the first direction of the lower frame is d1, When the gap between the claw portion formed on the side wall along the second direction of the upper frame and the opening formed on the side wall along the second direction of the lower frame is d2, d1 <d2 Satisfied.
[Selection] Figure 2

Description

  The present invention relates to a liquid crystal display device, and more particularly to a technique effective when applied to a liquid crystal display device having an upper frame.

A liquid crystal display device (also referred to as a liquid crystal display module) having a small TFT (Thin Film Transistor) type liquid crystal display panel is widely used as a display portion of a mobile device such as a mobile phone.
In general, a liquid crystal display device includes a liquid crystal display panel and a backlight that irradiates light to the liquid crystal display panel. It is comprised with a mold (henceforth a mold), the optical sheet group arrange | positioned inside a mold, a light-guide plate, and the reflective sheet arrange | positioned under a light-guide plate. The liquid crystal display panel includes a first substrate (for example, a glass substrate), a second substrate, and a liquid crystal sandwiched between the first substrate and the second substrate.
On the other hand, in recent years, in the spread of mobile devices, touch panel technology supporting a “human friendly” graphical user interface has become important. A liquid crystal display device with a touch panel that performs an operation corresponding to a menu by attaching a touch panel substrate to the surface of the liquid crystal display panel and touching a menu screen displayed on the liquid crystal display panel with a finger is also known.

JP 2007-25484 A

With the spread of liquid crystal display devices with touch panels, liquid crystal display devices with upper and lower metal frames are demanded as liquid crystal display devices for band phones.
9 and 10 are diagrams showing a schematic configuration of a conventional liquid crystal display device with upper and lower metal frames. FIGS. 9A and 10A are a front view and side views, respectively. FIG. 10B is a back view.
9 and 10, 1 is an upper polarizing plate, 2 is a second substrate, 16 is a lower frame, 20 is an upper frame, 30 is a claw portion formed on a side wall of the upper frame 20, and FPC is a flexible wiring substrate. .
In the conventional liquid crystal display device with upper and lower metal frames, the claw portion 30 formed on the side wall of the upper frame 20 is bent downward as viewed from the liquid crystal display panel side, and the opening formed on the side wall of the lower frame 16 The claw portion 30 is stopped and the upper frame 20 is fixed to the lower frame 16.
In that case, the upper frame 20 and the lower frame 16 are fixed only on the long side (two sides on the left and right) as shown in FIG. 9, or on the short side (the two upper and lower sides) as shown in FIG. ) Only. The reason is that when the claw portion 30 is removed from the state in which the upper frame 20 and the lower frame 16 are fixed, it is easier to work by fixing only the long side portion or only the short side portion. is there.

Therefore, the conventional liquid crystal display device with upper and lower metal frames has a problem that the upper frame 20 is weakly fixed on the side where the claw portion 30 is not formed. This is particularly noticeable when the material of the upper frame 20 is 0.1 to 0.15 t thin.
In order to solve this problem, the upper frame 20 and the lower frame 16 may be fixed on both the long side and the short side, but once the upper frame 20 is fixed to the lower frame 16, There has been a problem that it is very difficult to separate (remove) the upper frame 20 and the lower frame 16.
The present invention has been made to solve the problems of the prior art, and an object of the present invention is to firmly fix the upper and lower metal frames in a liquid crystal display device with upper and lower metal frames. At the same time, it is to provide a technique capable of easily removing the fitting of the upper and lower metal frames.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
(1) A liquid crystal display panel having a first substrate and a second substrate, an upper frame disposed on an observer side of the liquid crystal display panel and having an opening in a display area, and a back side of the liquid crystal display panel The backlight includes a backlight arranged, and the backlight includes a frame-shaped mold and a lower frame that houses the mold, and the upper frame includes the liquid crystal display panel, The upper frame has side walls around four sides, each side wall of the four sides of the upper frame has two claw portions, and the lower frame is arranged to cover the lower frame. The frame has side walls around four sides, each side wall of the four sides of the lower frame has two openings, and the upper frame has the claw portions formed on the side walls. Viewed from the liquid crystal display panel side Is fixed to the lower frame by being bent to the side and fixed to the opening formed in each side wall of the lower frame, and on the two opposite sides of the liquid crystal display panel When the parallel direction is the first direction and the direction parallel to the other two opposite sides is the second direction, the claw portion formed on the side wall of the upper frame along the first direction; , The distance in the first direction in the gap between the opening and the opening formed in the side wall along the first direction of the lower frame, d1, the side wall along the second direction of the upper frame When the distance in the second direction in at least one gap between the claw portion formed on the side wall and the opening formed on the side wall along the second direction of the lower frame is d2. , D1 <d2 is satisfied.

(2) In (1), when the thickness of the upper frame is t and α is a predetermined constant, d2 ≧ (2 × t + α) is satisfied.
(3) In (2), the thickness of the upper frame is 0.15 mm, and the d2 is 0.5 mm or more.
(4) In (2), the thickness of the upper frame is 0.3 mm, and d2 is 0.8 mm or more.
(5) In any one of (1) to (4), the mold has at least one protrusion on the outer periphery of each of the four side walls, and the lower frame is formed on each of the four side walls. And at least one claw portion provided corresponding to at least one projection formed in the mold, wherein the claw portion formed on each side wall of the lower frame is on the liquid crystal display panel side. It is fixed to the mold by being bent upward as viewed from the side and being stopped by the protrusions formed on the respective side walls of the mold.
(6) In any one of (1) to (5), the upper frame has cuts at four corners.
(7) In any one of (1) to (5), the lower frame has cuts at four corners.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
According to the present invention, in the liquid crystal display device with upper and lower metal frames, the upper and lower metal frames can be firmly fixed and the fitting of the upper and lower metal frames can be easily removed.

It is a disassembled perspective view which shows the liquid crystal display device of the Example of this invention. It is a figure which shows schematic structure of the liquid crystal display device of the Example of this invention. FIG. 3 is a cross-sectional view showing a cross-sectional structure along the line A-A ′ in FIG. 2. It is a perspective view which shows the nail | claw part seen from the arrow A side of FIG. FIG. 3 is a cross-sectional view showing a cross-sectional structure taken along the line B-B ′ of FIG. 2. It is a perspective view which shows the nail | claw part seen from the arrow A side of FIG. It is a figure for demonstrating the fixing method of a lower frame in the liquid crystal display device of the Example of this invention. It is a figure for demonstrating the mounting method of the flexible wiring board FPC in the liquid crystal display device of the Example of this invention. It is a figure which shows schematic structure of an example of the conventional liquid crystal display device with an upper and lower metal frame. It is a figure which shows schematic structure of the other example of the conventional liquid crystal display device with an upper and lower metal frame.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
FIG. 1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a diagram showing a schematic configuration of the liquid crystal display device according to the embodiment of the present invention, and FIG. It is a figure and each side view, FIG.2 (b) is a back view.
1 and 2, 1 is an upper polarizing plate, 2 is a second substrate (also called a CF substrate), 3 is a first substrate (also called a TFT substrate), 4 is a lower polarizing plate, and 6 is a resin frame mold (also called a TFT substrate). (Hereinafter referred to as mold), 9 is a reflection sheet, 10 is a light guide plate, 11 is an optical sheet group, 16 is a lower frame, 20 is an upper frame, 30 is a claw portion, DRV is a semiconductor chip, FPC is a flexible wiring board, and LD is It is a white light emitting diode.
The liquid crystal display panel LCD of this embodiment has a first substrate 3, a second substrate 2, a liquid crystal layer (not shown) sandwiched between the first substrate 3 and the second substrate 2, and a drive circuit. The mounted semiconductor chip DRV, the flexible printed circuit board FPC connected to one side of the first substrate 3, the lower polarizing plate 4 attached on the first substrate 3, and attached on the second substrate 2. And an upper polarizing plate 1. Here, the opposite side of the liquid crystal layer of the second substrate 2 is the observer side.

As the first and second substrates (2, 3), for example, transparent insulating substrates such as glass are used. The long side of the first substrate 3 is longer than the long side of the second substrate 2, and the first substrate 3 has a configuration that does not overlap with the second substrate 2 (hereinafter referred to as a non-overlapping region). The semiconductor chip DRV is mounted in a non-overlapping region on the surface of the first substrate 3 on the liquid crystal layer side.
Thin film transistors, pixel electrodes, and the like are formed on the first substrate 3, and color filters and the like are formed on the second substrate 2. Here, in the case of an IPS liquid crystal display panel, the counter electrode is provided on the first substrate 3 side. In the case of a TN or VA liquid crystal display panel, the counter electrode is provided on the second substrate 2 side.
The backlight B / L includes a mold 6, a light guide plate 10, an optical sheet group 11, a reflection sheet 9, and a lower frame 16.
As shown in FIG. 1, the light guide plate 10 is disposed in the mold 6, and the optical sheet group 11 is disposed on the light guide plate 10. A reflective sheet 9 is disposed below the light guide plate 10. Further, a lower frame 16 is disposed below the mold 6. Here, the optical sheet group 11 includes, for example, a lower diffusion sheet, two lens sheets, and an upper diffusion sheet.
A white light emitting diode LD that functions as a light source is disposed on one side surface of the light guide plate 10.

As shown in FIG. 1, the mold 6 has a side wall 6A around it, but the mold 6 is also formed with a support portion 6B for supporting the first substrate 3 of the liquid crystal display panel LCD. Further, a region 6C having a low height is provided in a part of the side wall 6A of the mold 6 parallel to one side of the non-overlapping region of the first substrate 3.
Further, as shown in FIG. 1, the lower frame 16 has a bottom surface 16A, and a side wall 16B is formed around the bottom surface 16A. An opening 33 is formed on the bottom surface 16 </ b> A of the lower frame 16.
Further, as shown in FIG. 1, the upper frame 20 has an opening in the display area, and a side wall 20A is formed around the opening.
As shown in FIG. 8, the flexible printed circuit board FPC protruding from the end of the first substrate of the liquid crystal display panel LCD has a part of the side wall 6A parallel to one side of the non-overlapping region of the first substrate 3 and a low region 6C. After being pulled out from the lower frame 16, it is bent and passes through the opening 33 formed in the bottom surface 16 </ b> A of the lower frame 16, and a part thereof is disposed on the back side of the lower frame 16. In FIG. 8, reference numeral 13 denotes a double-sided tape for attaching the peripheral portion of the first substrate 3 to the support portion 6 </ b> B of the mold 6.
Here, as shown to 16C of FIG. 1, the side wall 6A parallel to one side of the non-overlapping area | region of the 1st board | substrate 3 of the lower frame 16 is formed only in both ends, and the bending part of the center flexible wiring board FPC It is not formed in the part corresponding to. Similarly, as shown to 20B of FIG. 1, the side wall 20A parallel to one side of the non-overlapping area | region of the 1st board | substrate 3 of the upper frame 20 is formed only in both ends, and the bending part of the center flexible wiring board FPC It is not formed in the part corresponding to. Accordingly, when the flexible wiring board FPC is bent, the flexible wiring board FPC is brought into contact with the side wall 16A of the lower frame 16 and the side wall 20A of the upper frame 20, and the flexible wiring board FPC is prevented from being bent at an acute angle. The wiring on the FPC is prevented from being disconnected.

3 is a cross-sectional view showing a cross-sectional structure taken along the line AA ′ in FIG. 2, and FIG. 4 is a perspective view showing a claw portion viewed from the arrow A side in FIG. 5 is a cross-sectional view showing a cross-sectional structure along the line BB ′ in FIG. 2, and FIG. 6 is a perspective view showing a claw portion viewed from the arrow A side in FIG.
As shown in FIG. 2, the present embodiment is characterized in that the claw portion 30 for fixing the upper frame 20 to the lower frame 16 is provided in a total of eight places, two on each long side and two on the short side. .
In the present embodiment, as shown in FIG. 4, a claw portion 30 provided on the long side wall 20 </ b> A of the upper frame 20 and an opening 32 provided on the long side wall 16 </ b> A of the lower frame 16. The distance between the gaps is d1, as shown in FIG. 6, a claw portion 30 provided on the side wall 20A on the short side of the upper frame 20, and an opening portion 32 provided on the side wall 16A on the short side of the lower frame 16. D1 <d2 when the distance between the gaps is d2.
Here, the claw portion 30 formed on one side of the non-overlapping region of the first substrate 3 is formed on both side portions of the side wall 20A parallel to one side of the non-overlapping region of the first substrate 3 of the upper frame 20, In addition, the opening 32 formed on one side of the non-overlapping region of the first substrate 3 is formed on both sides of the side wall 16 </ b> A parallel to one side of the non-overlapping region of the first substrate 3.
In the present embodiment, the upper frame 20 can be moved in the left-right direction (left-right direction in FIG. 2) by making the interval d2 wider than the interval d1. Thus, as shown in FIG. 10, after fixing the upper frame 20 to the lower frame 16 with substantially the same workability (ease) as when the claw portion 30 is provided only on the side wall on the long side of the upper frame, The upper frame 20 and the lower frame 16 can be separated (removed).

Here, the distance d2 needs to satisfy d2 ≧ (2 × t + α), where t is the thickness of the upper frame 20 and α is the processing tolerance of the lower frame 16.
For example, when t is 0.15 mm and α is 0.2 mm, it is necessary to satisfy d2 ≧ 0.5 mm, and when t is 0.3 mm and α is 0.2 mm, d2 ≧ 0.8 mm is satisfied. There is a need.
In the above description, the distance between one gap between the claw portion 30 provided on the short side wall 20A of the upper frame 20 and the opening 32 provided on the short side wall 16A of the lower frame 16 is described. , D1 <d2 has been described. Between the claw portion 30 provided on the short side wall 20A of the upper frame 20 and the opening 32 provided on the short side wall 16A of the lower frame 16. It is also possible to set d1 <d2 and d1 <d′ 2 between the gaps d2 and d′ 2 between the two sides.
In the above description, the gap distance d2 between the claw portion 30 provided on the short side wall 20A of the upper frame 20 and the opening 32 provided on the short side wall 16A of the lower frame 16 is set. An explanation will be given of a case where the gap interval d1 between the claw portion 30 provided on the long side wall 20A of the upper frame 20 and the opening 32 provided on the long side wall 16A of the lower frame 16 is made larger. However, d2 <d1 is also possible.
In this case, the upper frame 20 is moved in the vertical direction (vertical direction in FIG. 2) to fix the upper frame 20 to the lower frame 16, and then the upper frame 20 and the lower frame 16 are separated (removed). .

As shown in FIGS. 4 and 6, in this embodiment, the upper frame 20 has cuts 20C at the four corners, and the lower frame 16 also has cuts 16E at the four corners.
FIG. 7 is a diagram for explaining a fixing method of the lower frame 16 in the liquid crystal display device of the present embodiment.
As shown in FIG. 7, the mold 6 has at least one protrusion 36 on the outer periphery of each side wall 6A. Further, the lower frame 16 has at least one claw portion 35 provided on each side wall 16 </ b> A so as to correspond to at least one protrusion 36 formed on the mold 6.
The lower frame 16 is secured to the projections 36 formed on the respective side walls 6A of the mold 6 by the claws 35 formed on the respective side walls 16A being bent upward as viewed from the liquid crystal display panel side. As a result, the mold 6 is fixed.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

1 Upper polarizing plate 2 Second substrate (CF substrate)
3 First substrate (TFT substrate)
4 Lower polarizing plate 6 Resin frame mold 6A Side wall 6B Supporting part 9 Reflecting sheet 10 Light guide plate 11 Optical sheet group 13 Double-sided tape 16 Lower frame 16A Side wall 16B Bottom face 16D Opening 16E Cut 20 Upper frame 20A Side wall 20C Cut 30, 35 Claw Part 32 Opening part 36 Projection part LCD Liquid crystal display panel DRV Semiconductor chip FPC Flexible wiring board LD White light emitting diode B / L Backlight

Claims (7)

A liquid crystal display panel having a first substrate and a second substrate;
An upper frame disposed on the viewer side of the liquid crystal display panel and having an opening in a display area;
A liquid crystal display device comprising a backlight disposed on the back side of the liquid crystal display panel,
The backlight includes a frame-shaped mold,
A lower frame for housing the mold,
The upper frame is disposed so as to cover the liquid crystal display panel and the lower frame,
The upper frame has side walls around four sides,
Each side wall of the four sides of the upper frame has two claw portions,
The lower frame has side walls around four sides,
Each side wall of the four sides of the lower frame has two openings,
In the upper frame, the claw portions formed on the respective side walls are bent downward as viewed from the liquid crystal display panel side, and the upper frames are stopped by the openings formed on the respective side walls of the lower frame. Is fixed to the lower frame,
When the direction parallel to one opposite two sides of the liquid crystal display panel is a first direction and the direction parallel to the other two opposite sides is a second direction, the first frame of the upper frame A distance in the first direction in a gap between the claw portion formed on the side wall along the direction and the opening formed on the side wall along the first direction of the lower frame, d1, At least one gap between the claw portion formed on the side wall along the second direction of the upper frame and the opening formed on the side wall along the second direction of the lower frame. A liquid crystal display device satisfying d1 <d2 where d2 is an interval in the second direction.   2. The liquid crystal display device according to claim 1, wherein d2 ≧ (2 × t + α) is satisfied, where t is the thickness of the upper frame and α is a predetermined constant. The upper frame has a thickness of 0.15 mm,
The liquid crystal display device according to claim 2, wherein the d2 is 0.5 mm or more. The upper frame has a thickness of 0.3 mm,
The liquid crystal display device according to claim 2, wherein the d2 is 0.8 mm or more. The mold has at least one protrusion on the outer periphery of each side wall of four sides,
The lower frame has at least one claw portion provided on each side wall of four sides corresponding to at least one protrusion formed on the mold,
The lower frame is configured such that the claw portions formed on the respective side walls are bent upward as viewed from the liquid crystal display panel side, and are stopped by the projections formed on the respective side walls of the mold. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is fixed to the mold.   The display device according to claim 1, wherein the upper frame has cuts at four corners.   The display device according to claim 1, wherein the lower frame has cuts at four corners.

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