JP2008235136A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the dislocation and looseness of a plastic frame for a metal frame after assembling wherein the metal frame and the plastic frame can be assembled smoothly. <P>SOLUTION: As the plastic frame P for fixing and holding a light source panel 1 equipped with a light guide plate and a liquid crystal display panel overlaid on the light source panel is inserted in the metal frame K, the bottom surface of the plastic frame P is made to contact with the inner surface of the metal frame K and a projection 7 formed on at a side plate substantially vertically crossing the bottom surface of the plastic frame P is engaged with a fitting hole 10 formed at the side plate substantially vertically crossing the inner surface of the metal frame K and the plastic frame P and the metal frame K are fixed. For the projection 7, a rear end surface 7a in the insertion direction of the plastic frame P to the metal frame K is arranged as an inclined surface and an end 10a facing the fitting hole 10 of the metal frame K is made to contact with the rear end surface 7a as the inclined surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which a liquid crystal display panel and a backlight are assembled to a plastic frame and a metal frame.

  In recent years, as a display device for mobile devices such as mobile phones, information devices such as personal computers and word processors, and display devices for video devices such as televisions, video movies, car navigation systems, etc., a liquid crystal characterized by light weight, thinness, and low power consumption. Display devices are frequently used. In many cases, such a liquid crystal display device has a built-in backlight (light source panel) for applying illumination light from behind the liquid crystal display panel in order to realize a bright display screen.

  For this reason, for example, in the case of a liquid crystal display module of a mobile phone, the liquid crystal display panel, a backlight that irradiates the liquid crystal display panel from the back surface, and a plastic frame that supports these components are used as components. At the same time, a structure that is incorporated into a plastic frame is adopted. The backlight is a surface light source that is placed on the back side of the liquid crystal display panel and emits light, and most of the surface is the light emitting part, but when assembling, a frame-like double-sided tape is provided around and the liquid crystal display panel is attached. I try to put it on.

  In the liquid crystal display module, the liquid crystal display panel includes glass and a polarizing plate. The backlight is composed of a plastic light guide plate, a plurality of films, and the like, and is incorporated in a plastic frame with a liquid crystal display panel attached, for example. In any case, the liquid crystal display panel and the backlight are thin, and in the liquid crystal display module with the above-described configuration, when a load is applied, there is a possibility that the liquid crystal display panel deforms and breaks the glass substrate of the liquid crystal display panel. Is expensive.

  Therefore, in order to improve the rigidity of the liquid crystal display module, a sheet metal (metal frame) that reinforces the periphery of the plastic frame and the bottom surface of the backlight is provided (for example, Patent Document 1 and Patent Document 2). reference). A side plate is made by bending the periphery of a sheet metal having a bottom plate, and a hole is formed in the side plate, and a protrusion is formed on a side surface of the plastic frame. Fixed to the frame, the rigidity of the liquid crystal display module is significantly improved.

  Specifically, for example, Patent Document 1 discloses a liquid crystal display device including a liquid crystal display panel, a metal bezel and a resin frame that hold the liquid crystal display panel, and an illumination unit. Here, the illumination unit includes a frame (plastic frame) to which a light guide plate, a reflection sheet, and the like are attached, and a metal support frame (metal frame) fixed to the frame. In this lighting unit, a plurality of openings are formed in the side plate of the metal support frame, and a plurality of locking claws protruding from the side plate of the frame are engaged with the openings, respectively. It has a fitting structure for engaging the frame.

In addition, the liquid crystal display device according to Patent Document 2 includes a liquid crystal display panel, an illumination unit (illumination unit), a frame body that holds these, and a back surface that is disposed on the back surface of the illumination unit and engages with the frame body. A plate, and a metal frame disposed around the plate and engaged with the back plate. Here, the frame body and the back plate are formed by engaging a key portion protruding on the inner peripheral surface of the claw vertically extending from the outer peripheral edge of the back plate with a stepped portion protruding on the outer peripheral surface of the frame body. It is fixed integrally. Further, the metal frame and the back plate are integrated by engaging a key portion protruding on the outer peripheral surface of the claw with an engaging means (a through hole and a tongue piece portion) formed on the outer peripheral surface of the metal frame. Fixed.
JP 2000-294024 A Japanese Patent Laid-Open No. 11-160681

  By the way, in the liquid crystal display device having a structure in which the metal frame is attached around the plastic frame as described above, it is important that the plastic frame is always fixed at a fixed position with respect to the metal frame. When a liquid crystal display device is incorporated as a display device for an electronic device such as a cellular phone, the metal frame and the liquid crystal display panel are treated as an integral unit, and the liquid crystal display as a display screen of the electronic device is based on the position of the metal frame. This is because the mounting position of the panel is determined. If the position of the plastic frame with respect to the metal frame is unstable, there is a possibility of causing a problem such as a displacement of the display screen of the electronic device.

  From this point of view, in the liquid crystal display devices according to Patent Documents 1 and 2, the plastic frame cannot always be fixed at a fixed position with respect to the metal frame, and the positional deviation cannot be suppressed. There's a problem. For example, in the liquid crystal display devices according to Patent Document 1 and Patent Document 2, when a metal frame is attached to a plastic frame, the clearance is essential. Without clearance, they cannot be inserted successfully and cannot be assembled. However, when the clearance is provided, it is inevitable that rattling occurs due to the clearance. Here, for example, as in the invention described in Patent Document 1, there is no other positioning mechanism, and the structure in which the protrusion is simply inserted into the hole is structurally unstable and prevents the rattling. It is not possible. This is because simply inserting the protrusions does not have a function of suppressing the fluctuation of the clearance. In addition, since there is a clearance between the protrusion and the fitting hole, there is a possibility of shaking in the thickness direction (insertion direction).

  In the invention described in Patent Document 2, since the plastic frame is suppressed by the tongue piece, rattling due to the clearance can be suppressed. However, in order to provide not only the fitting holes but also such tongue pieces in the metal frame, complicated processing is required for the sheet metal, which leads to an increase in cost. Further, as in Patent Document 1, shakiness in the thickness direction cannot be suppressed.

  The present invention has been proposed in view of the above-described technical problems, and it is possible to smoothly assemble a metal frame and a plastic frame, and the plastic frame may be displaced or loose with respect to the metal frame after assembly. An object of the present invention is to provide a liquid crystal display device having a structure suitable for thinning.

  A light source panel including a light guide plate for deriving light from a light source, a liquid crystal display panel disposed on the light source panel, a plastic frame for fixing and holding the light source panel and the liquid crystal display panel, and the plastic frame. A metal frame to be reinforced, and by inserting the plastic frame into the metal frame, the bottom surface of the plastic frame is brought into contact with the inner surface of the metal frame, and the side plate is substantially orthogonal to the bottom surface of the plastic frame. The provided protrusion is locked in a fitting hole provided in a side plate substantially orthogonal to the inner surface of the metal frame to fix the plastic frame and the metal frame, and the protrusion is connected to the metal frame of the plastic frame. The rear end surface in the insertion direction is inclined and the plastic frame In a state but which is fixed to the metal frame, it is characterized in that the end facing the fitting hole of the metal frame on the inclined surface is in contact.

  In the present invention, the bottom surface of the plastic frame is in contact with the inner surface of the metal frame, and the protrusion provided on the side plate substantially orthogonal to the bottom surface of the plastic frame is provided on the side plate substantially orthogonal to the inner surface of the metal frame. The plastic frame and the metal frame are fixed by being locked in the fitted holes. In addition, the protrusion has an inclined rear surface in the direction of insertion of the plastic frame into the metal frame, and in a state where the plastic frame is fixed to the metal frame, the protrusion is provided in the fitting hole of the metal frame. The facing end is abutted. Therefore, when viewed in the insertion direction of the plastic frame, the tip is positioned by abutting against the inner surface of the metal frame. The rear end is positioned by engaging the end of the fitting hole of the metal frame with the inclined surface of the protrusion.

  On the other hand, when viewed in the in-plane direction of the light source panel or the liquid crystal display panel, positioning is performed by locking the end of the fitting hole of the metal frame to the inclined surface of the protrusion. For example, even when a clearance is provided between the plastic frame and the metal frame, the movement in the direction in which the clearance is reduced is restricted by the end portion contacting the inclined surface. Therefore, for example, the same structure is provided on the opposite side, or the side plate on the opposite side is abutted against the inner surface of the metal frame without any clearance, so that positioning in the in-plane direction is also performed, and rattling in this direction occurs. There is nothing.

  According to the present invention, the metal frame and the plastic frame can be assembled smoothly, and the liquid crystal display has a structure suitable for thinning without the plastic frame being displaced or rattling with respect to the metal frame after the assembly. An apparatus can be provided.

  Hereinafter, a liquid crystal display device according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the liquid crystal display device of this embodiment includes a liquid crystal display panel 1 for performing various displays, and a light source panel 2 that emits light from the back side of the liquid crystal display panel 1. These are configured to be held by a combination of a metal frame K and a plastic frame P.

  The liquid crystal display panel 1 is configured, for example, by enclosing a liquid crystal material between an array substrate and a counter substrate, and pixel electrodes and switching elements (thin film transistors) corresponding to display pixels are formed in a matrix on the array substrate. Yes. In addition, a signal line for sending an electric signal to the pixel electrode and a gate line for supplying a switching signal to the thin film transistor which is a switching element are wired on the array substrate at right angles to each other. On the other hand, on the counter substrate, the counter electrode is formed on almost the entire surface with a transparent electrode material (for example, ITO), and a color filter layer is formed corresponding to each pixel. Further, polarizing plates are bonded to the outer surfaces of the array substrate and the counter substrate so that the polarization axes are orthogonal to each other.

  A circuit board F that supplies a drive signal to the liquid crystal display panel 1 is electrically connected to one end of the liquid crystal display panel 1 having the above-described configuration. On the back surface of the circuit board F, an LED light source 23 serving as a light source of the light source panel 2 is mounted. The liquid crystal display panel 1 displays an image by driving the switching element based on a drive signal from the circuit board F. A region where this image display is performed is a display region, and the liquid crystal display panel 1 has a display region in which a plurality of display pixels are arranged.

  The light source panel 2 is incorporated as a backlight of the liquid crystal display panel 1, and includes a light source, a light guide plate 21 for irradiating light from the light source to the back surface of the liquid crystal display panel 1, and the light guide plate. And a reflection sheet 22 disposed on the back surface side of 21. In the case of the present embodiment, the light source (LED light source 23) is installed on the circuit board F led out from the liquid crystal display panel 1, and the circuit board F is folded back to the back side of the liquid crystal display panel 1, thereby It arrange | positions so that it may oppose with respect to the end surface of the optical plate 21. FIG. As a result, the light emitted from the LED light source 23 can be incident on the light guide plate 21. The light emitted from the LED light source 23 is directly or reflected by the reflection sheet 22 and guided to the light guide plate 21. After passing through the light guide plate 21, the liquid crystal display panel 1 is irradiated. The liquid crystal display panel 1 transmits the irradiated light, and images such as characters and videos are displayed with a predetermined brightness.

  The plastic frame P is formed of various plastic materials, and directly supports the liquid crystal display panel 1 and the light source panel 2 described above and plays a role of fixing them. The plastic frame P is mainly composed of a support plate portion 4 that supports the back side of the liquid crystal display panel 1 and side plates 5a, 5b, 5c, and 5d that support the periphery. A guide portion 6 that functions as a guide for assembling the metal frame K and forms the outer shape together with the metal frame K is provided.

  Here, a rectangular opening 4 a corresponding to the light guide plate 21 of the light source panel 2 is formed in the support plate portion 4. By fitting the light guide plate 21 in the opening 4 a, a light source The panel 2 is fixed to the plastic frame P. The reflection sheet 22 may be attached so as to cover the bottom surface of the light guide plate 21 facing the opening 4a from the back side of the support plate 4 after the light guide plate 21 is fitted into the opening 4a. The light guide plate 21 having the reflection sheet 22 bonded to the bottom in advance may be fitted into the opening 4a. In the opening 4a, a light source insertion recess 4b is formed along one side of the light guide plate 21, and an LED light source 23 installed on the circuit board F is inserted into the light source insertion recess 4b. The light exit surface is disposed so as to face the end surface of the light guide plate 21.

  On the other hand, the liquid crystal display panel 1 is fixed by, for example, a double-sided adhesive tape or the like so as to be placed on the support plate portion 4, so that the liquid crystal display panel 1 is placed on the light guide plate 21 of the light source panel 2. Will be. Further, in the plastic frame P, the central portion of the side plate 5a corresponding to the drawing direction of the circuit board F is opened, and the circuit board F is drawn from here. The drawn circuit board F is folded back on the back side of the support plate portion 4 and accommodated in a stepped portion (not shown) space formed in a metal frame K described later.

  The plastic frame P having the above-described configuration is provided with a protrusion 7 as a fixing means for assembling and fixing the metal frame K to each other. By inserting the protrusion 7 into the fitting hole of the metal frame K, the plastic frame P and the metal frame K are positioned and fixed to each other. In the case of this embodiment, two protrusions 7 and 7 are provided at predetermined intervals on the outer peripheral surface D1 of the side plate 5d, and one protrusion is provided on each of the outer peripheral surfaces B1 and C1 of the opposite side plates 5b and 5c. 7 is provided. The major feature of each protrusion 7 is that the rear end surface 7a in the direction of insertion of the plastic frame P into the metal frame K is an inclined surface.

  In addition, the plastic frame P having the above-described configuration is assembled to the metal frame K in such a manner that the bottom surface of the plastic frame P is abutted against the inner surface of the metal frame K. Is the bottom surface E1 of each side plate 5a, 5b, 5c, 5d. Therefore, in the present embodiment, the bottom surface E1 of the side plates 5a, 5b, 5c, 5d corresponds to the bottom surface of the plastic frame P.

  The metal frame K is a member for supplementing the strength of the entire liquid crystal display device, and is attached to the plastic frame P. The metal frame K is formed by processing a metal plate such as a stainless plate, for example, and a bottom plate portion 8 for reinforcing the outside of the support plate portion 4 of the plastic frame P, and side plates 5a, 5b, 5c of the plastic frame P, It consists of side plates 9a, 9b, 9c, 9d that reinforce the outside of 5d.

  The bottom plate portion 8 is formed with a step surface 8a formed thinner than other portions, and the circuit board is formed in a space between the step surface 8a and the back surface of the support plate portion 4 of the plastic frame P. F is accommodated. Of the side plates 5a, 5b, 5c, and 5d, the side plate 9a corresponding to the drawing direction of the circuit board F has a central portion corresponding to the width of the circuit board F in the same manner as the side plate 5a of the plastic frame P. It is open.

  The metal frame K having the above-described configuration is also formed with fitting holes 10 as fixing means for the plastic frame P, and is provided in the side plates 5b, 5c, and 5d of the plastic frame P in the fitting holes 10, respectively. By inserting the protrusion 7, the plastic frame P and the metal frame K are assembled and fixed. Accordingly, the fitting hole 10 is formed at a position facing each protrusion 7 in the side plates 9b, 9c, 9d facing the side plates 5b, 5c, 5d of the plastic frame P.

  Next, assembly of the liquid crystal display panel 1, the light source panel 2, the plastic frame P, and the metal frame K will be described. In the liquid crystal display device of this embodiment, in order to fix the liquid crystal display panel 1 and the light source panel 2 with the plastic frame P and further reinforce them with the metal frame K, first, the light guide plate 21 is fitted into the opening 4a of the plastic frame P. In addition, the reflection sheet 22 is pasted, and the liquid crystal display panel 1 is placed on the light guide plate 21 and fixed.

  Next, a metal frame K is assembled to the plastic frame P to which the liquid crystal display panel 1 and the light source panel 2 (light guide plate 21 and the like) are fixed. In the assembly, as shown in FIG. Assembly is performed by placing the plastic frame P and inserting it in the direction of arrow A. Therefore, the direction of the arrow A is the direction in which the plastic frame P is inserted.

  When assembling, the plastic frame P is pushed in the direction of arrow A until the bottom surface of the plastic frame P (here, the bottom surface E1 of the side plates 5a, 5b, 5c, 5d) abuts against the inner surface of the metal frame K (the upper surface of the bottom plate 8). When the bottom surface of the plastic frame P (the bottom surface E1 of the side plates 5a, 5b, 5c, 5d) abuts against the inner surface of the metal frame K (the top surface of the bottom plate 8), the projections 7 are formed on the side plates 9b, 9c, 9d of the metal frame K. It fits in each fitting hole 10 provided in. At the time of the insertion, the side plates 9b, 9c, 9d of the metal frame K are slightly expanded by the projections 7, but when the projections 7 are fitted into the fitting holes 10, the side plates 9b, 9c, 9d. It returns to its original state due to its own elastic force. The assembled state of the plastic frame P and the metal frame K is shown in FIG. In this state, when the bottom surface of the plastic frame P (the bottom surface E1 of the side plates 5a, 5b, 5c, 5d) abuts against the inner surface of the metal frame K (the top surface of the bottom plate 8), the position restriction in the insertion direction (arrow A direction). Is made. In addition, since the protrusion 7 is locked in the fitting hole 10, position control in the opposite direction is performed, and the plastic frame P is not detached from the metal frame K.

  In the assembly structure of the plastic frame P and the metal frame K, a so-called clearance is provided between the plastic frame P and the metal frame K. Specifically, as shown in FIG. 4, the inner dimension D2 of the metal frame K is set to be slightly larger than the outer dimension D1 of the plastic frame P, as shown in the dimensions of each element. Thereby, a clearance (gap) corresponding to the dimensional difference (D2−D1 = k) is formed between the plastic frame P and the metal frame K.

  The clearance is indispensable for smoothly assembling the plastic frame P and the metal frame K, but if there is a clearance between the plastic frame P and the metal frame K, the plastic frame P (therefore, the liquid crystal display panel 1 and the light source). This may cause misalignment or rattling of panel 2).

  Therefore, in the liquid crystal display device of the present embodiment, the rear end surface 7a in the insertion direction (the A direction) of the protrusion 7 is an inclined surface, and the end portion 10a facing the fitting hole 10 of the metal frame K is projected here. By applying the contact, the positional deviation and rattling are prevented. For example, as shown in FIG. 5, when the rear end surface 7a of the projection 7 is a vertical surface, a clearance is also provided between the projection 7 and the fitting hole 10 in order to achieve smooth fitting. Must be provided. When the clearance is provided, the projecting portion 7 does not act as a restraint for the lateral movement (position shift or rattling) of the plastic frame P in the drawing. In addition, due to the clearance, positional displacement and rattling also occur in the vertical direction of the plastic frame P in the figure. On the other hand, if the rear end surface 7a of the protruding portion 7 is an inclined surface and the end portion 10a facing the fitting hole 10 of the metal frame K is abutted, the positional deviation or shakiness in any direction of the plastic frame P will occur. Is also reliably suppressed.

  However, in order to abut the end portion 10 a facing the fitting hole 10 of the metal frame K against the rear end surface 7 a of the protruding portion 7, the formation position and size of the protruding portion 7 and the end portion 10 a facing the fitting hole 10 are used. It is necessary to set the position etc. appropriately.

  The position where the projection 7 is formed, but the distance from the abutment surface of the plastic frame P and the metal frame K (that is, the bottom surface E1 or the top surface of the bottom plate 8) to the base edge 7b of the rear end surface 7a of the projection 7 L1 needs to be larger than the distance L3 from the abutting surface of the plastic frame P and the metal frame K to the end portion 10a facing the fitting hole 10. When the distance L3 is smaller than the distance L1, a clearance is generated between the protrusion 7 and the fitting hole 10, and the positional deviation and rattling cannot be suppressed. The distance L2 from the abutting surface of the plastic frame P and the metal frame K to the leading edge 7c of the rear end surface 7a of the protrusion 7 is an end facing the fitting hole 10 from the abutting surface of the plastic frame P and the metal frame K. It is necessary to be smaller than the distance L3 to the part 10a. If the distance L2 is greater than the distance L3, the protrusion 7 cannot be fitted into the fitting hole 10. Therefore, if the distance L1> the distance L3> the distance L2 is set, the end portion 10a facing the fitting hole 10 abuts on the rear end surface (inclined surface) 7a, and the positional deviation prevention mechanism or the rattling prevention mechanism. Work as.

  For example, in FIG. 4, in the protrusion 7 arranged on the right side in the drawing, the end 10a abuts against the rear end surface 7a, so that the clearance of the metal frame K in the direction (arrow x1 direction in the drawing) decreases. Movement is restricted. In the direction of the arrow x1, the distance from the abutment surface of the plastic frame P and the metal frame K to the rear end surface 7a of the protrusion 7 is increased, and the metal frame K can move in this direction. Can not. Further, the abutment of the end portion 10a against the rear end surface 7a is also effective for preventing the positional deviation or rattling of the plastic frame P in the vertical direction in the figure. That is, the position of the plastic frame P and the metal frame K is restricted in the direction of the arrow z1 in the figure, and the opposite direction (in the figure) by the abutment of the end 10a to the rear end surface 7a. Position restriction in the direction of the arrow z2) is performed, and there is no positional deviation or rattling in the plastic frame P in the vertical direction.

  In the projection 7 arranged on the right side in the figure, the movement of the metal frame K in the direction in which the clearance increases (the arrow x2 direction in the figure) cannot be restricted. Can be supplemented by a protrusion 7 and a fitting hole 10 formed on a pair of substantially parallel side plates of the plastic frame P and metal frame K facing each other. In the case of the present embodiment, a protrusion (left protrusion in the figure) 7 is also formed on the side plate 5b facing in parallel with the side plate 5c in which the right protrusion 7 is formed in the figure, and the right fitting hole in the figure A fitting hole (fitting hole on the left side in the figure) 10 is also formed in the side plate 9b facing in parallel with the side plate 9c on which the numeral 10 is formed. In locking the protrusion 7 and the fitting hole 10 on the left side in the figure, the movement of the arrow z1 direction and the arrow z2 direction is restricted, and the metal frame K in the direction in which the clearance is reduced (arrow x2 direction in the figure). Movement is restricted. Therefore, by both of these actions, the positional displacement and the rattling of the plastic frame P in the horizontal direction in the figure are surely prevented.

  In the protrusion 7 described above, the inclination angle of the rear end surface 7a which is an inclined surface can be arbitrarily set. However, if the rear end surface 7a is too steep, the function as the inclined surface may not be achieved. Conversely, if the rear end surface 7a is too gentle, the position regulating force may be insufficient. Considering these, it is preferable to set the inclination angle of the rear end face 7a appropriately. Specifically, for example, when the height of the protrusion 7 is 0.2 mm to 0.25 mm, the difference between the distance L1 and the distance L2 is preferably 0.05 mm to 0.1 mm. By designing an angle satisfying such a condition on the rear end face 7a, the position can be reliably regulated.

  In the liquid crystal display device of the present embodiment having the above-described configuration, the metal frame K and the plastic frame P can be smoothly assembled, and the positional deviation or rattling of the plastic frame P after assembly is possible. Can be reliably prevented.

  Needless to say, the present invention is not limited to the above-described embodiment, and the shape, size, and the like of each component can be arbitrarily changed without departing from the scope of the present invention. For example, in the previous embodiment, the entire rear end surface 7a of the protrusion 7 is an inclined surface. However, as shown in FIG. 6, a part of the rear end surface 7a is an inclined surface and the base end portion is a vertical surface. It is also possible to do. In this case, it is necessary to satisfy the distance L4> distance L3> distance L2 to the vertical plane.

  In the previous embodiment, the bottom surface E1 of the side plates 5a to 5d of the plastic frame P is configured to abut against the inner surface of the metal frame K (the upper surface of the bottom plate 8). However, as shown in FIG. The bottom surface of the support plate portion 4 and the bottom surfaces of the side plates 5a to 5d may be flush with each other, and the entire bottom surface may abut against the inner surface of the metal frame K.

  Further, in any case of the fitting structure, the formation position and the number of formation are arbitrary. For example, in the example shown in FIG. 1, each of the side plates 5b and 5c of the plastic frame P and the corresponding side plates 9b and 9c of the metal frame K are formed with one protrusion 7 and one fitting hole 10, respectively. However, a plurality of these side plates may be formed. However, it is preferable that the formation position is a position somewhat away from the corner. In the metal frame K and the plastic frame P, the corner is the portion to which stress due to dimensional tolerance or thermal expansion is most applied. Therefore, it is preferable that the corner portion is in a free state in order to absorb these tolerances and stresses, and the protruding portion 7 and the fitting hole 10 are formed at a position that does not significantly affect the absorbing action.

It is a perspective view which shows the external appearance shape of the liquid crystal display device to which this invention is applied. It is a disassembled perspective view which shows the structure of this embodiment clearly. It is a principal part schematic sectional drawing which shows the structure and arrangement | positioning of the said fitting hole and projection part when this embodiment is cut | disconnected along the longitudinal direction. It is the principal part schematic sectional drawing which expandedly displayed the structure and arrangement | positioning of the said fitting hole and projection part periphery when this Embodiment was cut | disconnected along the longitudinal direction. An example of a liquid crystal display device in which a clearance is generated between the protrusion and the fitting hole when the plastic frame and the metal frame are assembled is formed around the fitting hole and the protrusion when the longitudinal direction is cut. It is the principal part schematic sectional drawing which expanded and displayed the structure and arrangement | positioning. It is a schematic sectional drawing which shows the other example of the said projection part and fitting hole of this embodiment. It is a principal part schematic sectional drawing which shows the structure and arrangement | positioning of the said fitting hole and projection part when an example of this embodiment is cut | disconnected along the longitudinal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel, 2 Light source panel, 4 Support plate part, 4a Opening of support plate part 4,
5a, 5b, 5c, 5d Each side plate of plastic frame, 6 guide part,
7 Projection, 7a Rear end surface of the projection, 7b Base end edge of the rear end surface of the projection,
7c The leading edge of the rear end surface of the protrusion, 8
9a, 9b, 9c, 9d Each side plate of the metal frame, 10 fitting hole, 21 light guide plate,
A1, B1, C1, D1 The outer peripheral surface of the plastic frame,
E1 Bottom of each side plate of plastic frame, P plastic frame,
K metal frame

Claims (4)

A light source panel including a light guide plate for deriving light from a light source, a liquid crystal display panel disposed on the light source panel, a plastic frame for fixing and holding the light source panel and the liquid crystal display panel, and the plastic frame. With a metal frame to reinforce,
By inserting the plastic frame into the metal frame, the bottom surface of the plastic frame is brought into contact with the inner surface of the metal frame, and the protrusion provided on the side plate substantially orthogonal to the bottom surface of the plastic frame has a metal frame. The plastic frame and the metal frame are fixed by being locked in a fitting hole provided in a side plate substantially orthogonal to the inner surface of
The protrusion has an inclined rear surface in the direction of insertion of the plastic frame into the metal frame, and faces the fitting hole of the metal frame on the inclined surface when the plastic frame is fixed to the metal frame. A liquid crystal display device, characterized in that an end portion is in contact therewith.   2. The liquid crystal display device according to claim 1, wherein the protrusion and the fitting hole are formed to face each other at least on a pair of substantially parallel side plates facing each other of the plastic frame and the metal frame.   In the direction in which the plastic frame is inserted into the metal frame, the distance from the base end edge of the inclined surface of the protruding portion to the bottom surface is L1, the distance from the leading edge of the inclined surface of the protruding portion to the bottom surface is L2, 3. The liquid crystal according to claim 1, wherein L1> L3> L2, where L3 is a distance from the end of the metal frame in contact with the inclined surface to the inner surface of the metal frame where the plastic frame abuts. Display device.   4. The liquid crystal display device according to claim 3, wherein a height of the protrusion is 0.2 mm to 0.25 mm, and a difference between the distance L <b> 1 and the distance L <b> 2 is 0.05 mm to 0.1 mm.

Images