JP2010032923A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display having a structure hardly damaged against generation of impact or the like, and capable of reducing thickness. <P>SOLUTION: The liquid crystal display includes a backlight part (light source part S and light guide panel LG) for providing a light to a display area by surface luminescence, an outer frame OF provided to surround the periphery of the backlight part, a metal inner frame IF supported by the outer frame OF and formed of a plate-like frame opened in response to the display area DP, and a liquid crystal cell LC with its edge part supported by the inner frame IF, and forming the display area by transmitting the light provided from the backlight part thorough a liquid crystal material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device mounted on a thin display terminal such as a mobile phone.

  As seen in thin liquid crystal display devices mounted on mobile phones, thinning is one of the development directions required for liquid crystal display devices.

  In order to reduce the thickness of the liquid crystal display device, the members used in the liquid crystal display device are limited, and further, these members can be assembled so as not to cause unnecessary thickness, while each member is made thin or small. It is necessary to design to.

  FIG. 8 is an exploded perspective view showing the configuration of each member in a conventional thin liquid crystal display device. 2 is a top view showing an outline of assembling each member shown in FIG. 8, and FIGS. 9A and 9B show the AA cross section and the BB cross section in FIG. Yes.

  As shown in FIGS. 9A and 9B, the above liquid crystal display device has the polarizing plate PL2 and the external frame OF in the liquid crystal cell LC bonded to each other through the light shielding film LS provided according to the edge of the liquid crystal cell LC. A spacer SP is provided to fill a gap generated between members such as the TFT substrate SUB and the light shielding film LS.

  However, by reducing the thickness of the liquid crystal display device, the mechanical strength of each member is weakened, so that the liquid crystal display device is easily broken due to the occurrence of an impact or the like.

  The present invention proposes a liquid crystal display device that has a structure that is not easily destroyed by the occurrence of an impact or the like and can be thinned.

  (1) In order to solve the above-described problems, a liquid crystal display device according to the present invention is provided so as to surround a backlight portion that provides light to a display region by surface light emission and a periphery of the backlight portion. An outer frame, a metal inner frame formed by a plate-like frame supported by the outer frame and opened according to the display area, and an edge of the inner frame supported by the inner frame, the backlight And a liquid crystal cell that forms the display region by transmitting light provided from the portion to the liquid crystal material. According to the liquid crystal display device according to (1), the liquid crystal display device can be thinned with a structure that is not easily broken against the occurrence of an impact or the like.

  (2) In the liquid crystal display device of (1), the inner frame blocks light from the backlight unit from entering the edge of the liquid crystal cell.

  (3) In the liquid crystal display device of (1) to (2), the backlight unit has a light guide plate on which a light emitting surface for providing light to the display region is formed, and a lateral side adjacent to the light guide plate. And a light source unit that generates light to be introduced into the light guide plate, wherein the inner frame forms a groove according to a position at which the light source unit introduces light into the light guide plate, and the light source unit Is formed so as to be thicker than the thickness of the light emitting surface of the light guide plate, and the light guide plate includes a light introducing portion into which light is introduced from the light source portion, and the light introducing portion is provided in the light source portion. The light introduction part and the light source part are formed in a suitable thickness, and at least a part of each is housed in the groove part. According to the liquid crystal display device according to (3), it is possible to further reduce the thickness by storing a part of the light source portion or the like in the groove portion of the inner frame.

  (4) In the liquid crystal display device of (3), the light source unit includes one or a plurality of LED light source units formed so as to be thicker than a plate thickness of the light emitting surface of the light guide plate, and the light introduction unit Is formed with one or a plurality of raised portions that are raised with respect to the light emitting surface according to the position of the LED light source portion, and the groove portion is formed with a protruding portion that engages with the raised portion on the inside thereof. It is characterized by that.

  (5) In the liquid crystal display devices of (1) to (4), the backlight unit includes one or a plurality of LED light source units that generate light to be provided to the display region, and the internal frame or the external frame is And a protrusion that engages at least part of the LED light source.

  (6) In the liquid crystal display device of (5), the backlight unit is disposed laterally adjacent to each of the LED light source units, and provides light introduced from the LED light source unit to the display region. A light guide plate having a light emitting surface formed thereon, wherein the LED light source unit is formed to be thicker than a thickness of the light emitting surface of the light guide plate, and the light guide plate emits light from the LED light source unit. A light introducing portion to be introduced, wherein the light introducing portion is raised with respect to the light emitting surface according to the arrangement of the LED light source portion, and is formed to be thick according to the LED light source portion. The inner frame includes a protrusion that engages at least a part of the LED light source, and the protrusion of the inner frame engages with the LED light source and the light guide plate. This engages with the ridge. The features. According to the liquid crystal display device according to (6), the inner frame is engaged with the LED light source unit or the like, and can be further thinned.

  (7) In the liquid crystal display device of (1) to (6), the inner frame is formed with a notch so as to form a gap in a portion supported by the outer frame, and the backlight unit is A light source unit that generates light to be provided to the display region; and a flexible printed circuit board that provides power to the light source unit, wherein the flexible printed circuit board provides light to the display region of the backlight unit. It connects with the said light source part, and is extended outside the said external frame via the said clearance gap at least.

  (8) In the liquid crystal display devices according to (1) to (7), the backlight unit generates a light source for generating light to be provided to the display area, and a flexible printed circuit board that provides power to the light source unit. The flexible printed circuit board is connected to the light source unit on a side opposite to a side that provides light to the display area of the backlight unit, and is connected to the outside via the opposite side of the external frame. It is characterized by extending outside the frame.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of main members of the liquid crystal display device according to the present embodiment. The liquid crystal display device shown in the figure includes a liquid crystal cell LC, an internal frame IF, an optical sheet OS, a light guide plate LG, a light source unit S, an external frame OF, a reflective sheet RS, and flexible printed boards F1 and F2. ing. In such a liquid crystal display device, light is provided from a backlight unit including the light source unit S and the light guide plate LG, whereby the liquid crystal cell LC displays an image or an image.

  FIG. 2 is a schematic view of the assembled state of the members in the liquid crystal display device of FIG. 1 as viewed from above. As shown in the figure, the outer frame OF is formed in a frame shape larger than the outer periphery of the liquid crystal cell LC, and the flexible printed boards F1 and F2 are extended outside the outer frame OF. Here, the liquid crystal cell LC includes a polarizing plate PL1, a color filter substrate CF, a TFT substrate SUB, a driver DR, and the like, which will be described in detail later. In addition, a dotted line area in the figure indicates a display area DP for displaying an image of the liquid crystal display device. This liquid crystal display device is mounted on, for example, a mobile phone or a small portable information terminal (Personal Digital Assistant), and displays an image in accordance with an input provided from a user or a network.

  3A and 3B are cross-sectional views of the AA cross section and the BB cross section of the liquid crystal display device in FIG. 2 is common to FIG. 3A in this embodiment.

  Here, the manner in which an image is displayed in the display area DP of the liquid crystal display device will be described mainly with reference to FIG. 3A.

  In this liquid crystal display device, first, the light source unit S emits light by a power source provided from the flexible printed circuit board F2. The light emitted by the light source part S is emitted from the light emitting surface LE of the light guide plate LG and guided to the display area DP. Further, a reflection sheet RS is provided on the surface opposite to the light emitting surface LE of the light guide plate LG, and the light reaching the reflection sheet RS is reflected, and the side where the display region DP is formed in the liquid crystal display device ( Hereinafter, it is guided to the upper side and the opposite side as the lower side.

  Next, the light emitted from the light emitting surface LE of the light guide plate LG is condensed or diffused by the optical sheet OS formed by a prism or the like, and enters the liquid crystal cell LC so as to have a substantially uniform light amount distribution.

  Here, the liquid crystal cell LC includes a TFT substrate SUB, which is a glass substrate in which thin film transistors (TFTs) are formed in a matrix, and a color filter substrate CF in which a color filter is formed on the glass substrate, and these substrates are liquid crystal materials. Is pinched. Here, the liquid crystal material has both the fluidity of liquid and the optical properties of solid (crystal), and the direction of the liquid crystal molecules constituting the liquid crystal material can be changed by voltage etc. to increase or decrease the light transmittance. It means a substance. In the color filter substrate CF, an upper polarizing plate PL1 is formed on the side opposite to the side holding the liquid crystal material, and in the TFT substrate SUB, a lower polarizing plate PL2 is formed on the side opposite to the side holding the liquid crystal material. . Further, the liquid crystal cell LC is provided with a driver DR and a flexible printed board F1, and the liquid crystal material is driven by providing power and signals to each pixel from these drivers.

  The light incident on the liquid crystal cell LC from the optical sheet OS passes through the lower polarizing plate PL2 as linearly polarized light. Then, when the light passing through the lower polarizing plate PL2 passes through the liquid crystal material sandwiched between the TFT substrate SUB and the color filter substrate CF, the polarization direction is changed for each pixel according to the crystal state of the liquid crystal material. Furthermore, the light transmitted through the color filter substrate CF reaches the upper polarizing plate PL1, and the upper polarizing plate PL1 transmits or blocks light according to the polarization state of the light transmitted through the color filter substrate CF. In this way, the liquid crystal display device forms an image and displays it on the display region DP by allowing the upper polarizing plate PL1 to transmit or shield the light whose polarization direction is controlled while traveling from the light emitting surface LE. It will be.

  Further, the display area DP here is an area where light is provided from the light emitting surface LE to the liquid crystal cell LC to form an image. In this embodiment, as shown by the dotted line in FIG. It is formed further inside the region where PL1 is formed. For example, when the liquid crystal display device is mounted on a mobile phone, the display area DP may be partitioned on four sides by a cover or the like that forms the body of the mobile phone.

  In the foregoing, the manner in which an image is displayed in the display area DP in the liquid crystal display device according to the present embodiment has been described. Hereinafter, the backlight unit (the light source unit S and the light guide plate LG), the liquid crystal cell LC, the external frame OF, the internal frame IF, and the like in this liquid crystal display device will be described with reference to FIGS. 1, 2, 3A, and 3B. The details will be described.

[Backlight section]
The light source unit S is formed using a light emitting element such as a light emitting diode (LED). As shown in FIG. 1, the light source unit S in the present embodiment is formed in a rectangular column shape using a resin or the like, and one or a plurality of LED elements are provided therein. Furthermore, a flexible printed circuit board F2 that provides power is provided on the upper surface of the light source unit S.

  The light guide plate LG is formed, for example, by injection molding a material such as resin. The light guide plate LG is disposed adjacent to the light source unit S, and at least a part of the side wall of the light guide plate LG is in contact with the side surface of the light source unit S. In the present embodiment, as shown in FIG. 3A and the like, the light source part S is disposed on the side of the light guide plate LG, and the side surface in the longitudinal direction of the light source part S formed in a rectangular column shape is in close contact with the side wall of the light guide plate LG. is doing. Further, the light guide plate LG is formed with a light emitting surface LE that guides light from the light source part S and emits light in a planar shape so as to spread below the display region DP.

  The lower surface of the light source unit S and the light guide plate LG is in contact with the reflection sheet RS. The light source unit S of the present embodiment is formed to be thicker than the plate thickness of the light emitting surface LE of the light guide plate LG, whereby light can be efficiently emitted from the light emitting surface LE. Moreover, the plate | board thickness in the light emission surface LE here means the space | interval from the lower surface of the light-guide plate LG to the light emission surface LE.

  The light guide plate LG is formed so as to increase the area of the side wall in contact with the light source unit S in order to reduce the loss of the amount of light obtained from the light source unit S. Specifically, the light introduction part LI, which is a part where light is introduced from the light source part S in the light guide plate LG, is formed with a thickness corresponding to the light source part S. For example, as shown in FIG. 3A, the light introducing portion LI is raised between the side wall connected to the light source unit S and the light emitting surface LE while being inclined so that the plate thickness gradually increases as the side wall is approached. A raised portion LU is formed. As shown in FIG. 1 and the like, when the raised portion LU is formed in the light introducing portion LI, the side surface of the light source portion S formed so as to be thicker than the light emitting surface LE substantially matches the side surface of the light guide plate LG. Connected in a shape to

  An optical sheet OS is laminated on the light emitting surface LE, and light from the light emitting surface LE is incident on the liquid crystal cell LC so as to have a substantially uniform light amount distribution. The optical sheet OS in the present embodiment is composed of four layers, and each layer of the optical sheet OS is laminated so as to extend to the raised portion LU formed in the light introducing portion LI.

[External frame]
The external frame OF is formed, for example, by injection molding by pouring resin into a dedicated mold. As shown in FIG. 3A and the like, the external frame OF is formed in a frame shape so as to surround the outer periphery of the backlight portion. The light source part S formed in a rectangular column shape is fixed by being fitted to the external frame OF along one side in the short direction of the external frame OF, and the light guide plate LG is in contact with the light source part S while the side wall is in contact therewith. The outer frame OF is fixed by being fitted to the other side. Further, the outer frame OF covers the side surfaces of the light source unit S and the light guide plate LG that form the outer periphery of the backlight unit, thereby preventing light from leaking from the side surfaces.

  The reflective sheet RS is provided so as to extend below the external frame OF and the backlight unit, and the reflective sheet RS is fixed to the external frame by a double-sided tape DT as shown in the figure.

  In the above description, the light source unit S and the light guide plate LG are fixed to the external frame OF by being fitted together. However, the external frame OF is composed of a plurality of parts and assembled from the outside of the backlight unit. The part may be fixed.

[Internal frame]
The internal frame IF is formed of a metal such as stainless steel, for example. The inner frame IF is placed on the upper side of the outer frame OF so as to be supported by the outer frame OF, and supports the liquid crystal cell LC from the lower side. At this time, the internal frame IF is opened according to the display area DP and formed in a frame shape so as not to block light incident on the display area DP formed by the liquid crystal cell LC. Further, the inner frame IF is formed in a plate shape in order to reduce the thickness of the liquid crystal display device by being interposed between the outer frame OF and the liquid crystal cell LC.

  Further, as shown in FIG. 3A and the like, the inner frame IF has an outer extension portion supported by the outer frame OF. The portion of the inner frame IF that is not supported by the outer frame OF may be supported by the optical sheet OS or the flexible printed circuit board F2 on the light source unit S.

  In the present embodiment, the engaging portion Q that engages with the internal frame IF is provided along one side of the external frame OF to which the light source portion S is fitted. The internal frame IF is positioned with respect to the external frame OF by the engaging portion Q, and is fixed by the external frame OF and the double-sided tape DT. The engaging portion Q of the external frame may be provided on all sides, or may be provided on any one side as in the present embodiment.

[Liquid crystal cell]
As described above, the liquid crystal cell LC includes the TFT substrate SUB, the color filter substrate CF, the upper polarizing plate PL1, and the lower polarizing plate PL2. As shown in FIGS. 3A and 3B, the edge of the liquid crystal cell LC is supported by the internal frame IF. Specifically, the inner frame IF supports a portion of the TFT substrate SUB where the lower polarizing plate PL2 is not provided, and the outer extension of the TFT substrate SUB is supported in a frame shape by the inner frame IF.

  As shown in FIG. 3A, the TFT substrate SUB of the liquid crystal cell LC is provided with an extending portion E in which at least one direction extends more than the other direction. Thereby, the frame in the other direction of the liquid crystal display device is formed to be narrower than the frame in the one direction.

  The extended portion E is provided with a driver DR and a flexible printed circuit board F1 that provide signals and power to the transistors of each pixel to drive them. As shown in the figure, the light source portion S and the light introducing portion LI of the light guide plate LG are disposed below the extended portion E of the TFT substrate SUB.

  The internal frame IF supports the liquid crystal cell LC so as to shield light incident from the backlight portion on the edge of the liquid crystal cell LC. Further, as shown in the figure, one side of the internal frame IF that supports the extending portion E of the TFT substrate SUB blocks light from the light source unit S and the light introduction unit LI according to the frame of the liquid crystal display device. The width is wider than the other side.

  A double-sided tape DT is interposed between the internal frame IF and the TFT substrate SUB to fix them.

[Flexible printed circuit board]
The flexible printed circuit board F1 is provided on the upper surface of the light source part S formed in a rectangular column shape, and passes through a notch part CO1 formed in a part of the external frame OF as shown in the developed perspective view of FIG. Then, it extends to the outside of the outer frame OF. As shown in FIG. 1 and the like, the cutout portion CO1 is formed at a position where the flexible printed circuit board F2 extends in accordance with the thickness of the light source portion S formed in a rectangular column shape.

[Embodiment 2]
4A is an exploded perspective view of main members of the liquid crystal display device according to Embodiment 2. FIG. The liquid crystal display device shown in the figure includes a liquid crystal cell LC, a light shielding film LS, an internal frame IF, an optical sheet OS, a light guide plate LG, a light source part S, an external frame OF, a reflective sheet RS, and flexible printed circuit boards F1 and F2. It is configured to include. A schematic view of the assembled state of each member in the figure from the top is the same as FIG. 2 of the first embodiment. 4B is a diagram for explaining a state in which the light guide plate LG, the internal frame IF, and the flexible printed board F2 connected to the light source unit S in the second embodiment are assembled.

  5A, FIG. 5B, and FIG. 5C are sectional views of an AA cross section, a BB cross section, and a CC cross section in the schematic top view of FIG. The main differences between the second embodiment and the first embodiment described above are that the backlight unit (light source unit S and light guide plate LG), the shape of the internal frame IF, the external frame OF, and the light shielding film LS are provided. is there. Hereinafter, these differences will be described, but a detailed description of the same parts as those in the first embodiment will be omitted.

[Internal frame]
In particular, the inner frame IF in the second embodiment is an inner frame formed on the upper side of the light source unit S according to the position where the light source unit S and the light introducing unit LI of the light guide plate LG are in contact with each other, as shown in FIG. 4A. A groove portion V having a predetermined width is formed on one side. The groove portion V is formed in a portion that supports the extending portion E of the TFT substrate SUB in the internal frame IF. Further, as shown in the figure, the groove portion V may be formed so as to penetrate the portion supporting the extending portion E, or the groove portion V may be formed in a concave shape on the lower surface of the internal frame IF without penetrating. It is good also as forming.

  In the second embodiment, the light source unit S and the light guide plate LG are in contact with each other in the short side of the liquid crystal display device, and the internal frame IF forms a groove V so as to penetrate the internal frame IF according to the contact position. ing. Thereby, one side of the inner frame IF formed in a frame shape is formed by an inner frame and an outer frame that extend in parallel as a pair.

  As shown in FIGS. 5A to 5C, the inner frame IF is supported in a frame shape by the outer frame OF at the outer extension of the formed frame and by the light guide plate LG at the inner extension of the frame. On one side where the groove portion V of the inner frame IF is formed, the outer frame is supported by the outer frame OF and the inner frame is supported by the light guide plate LG.

  As shown in FIGS. 5A and 5C, the groove portion V includes a light source portion S formed to be thicker than the plate thickness of the light emitting surface LE of the light guide plate LG, and a light introduction portion LI formed with a thickness corresponding to the light source portion S. Are formed so as to accommodate at least a part of each. The groove portion V secures a space for forming the light source portion S and the light introducing portion LI thicker than the light emitting surface LE.

  Further, the inner frame IF has a protrusion R1 that engages with one or a plurality of raised portions LU formed so that the light introducing portion LI rises in accordance with the shape of the light source portion S, and is formed on the inner surface of the groove portion V. The

  In Embodiment 2, since the groove portion V is formed so as to penetrate therethrough, a light shielding film LS is provided between the liquid crystal cell LC and the internal frame IF, and proceeds from the light source portion S and the light guide plate LG to the groove portion V. Is blocked from entering the liquid crystal cell LC. As shown in FIG. 4, the light shielding film LS may have a shape similar to the shape of the internal frame IF, and may be provided so as to adhere the liquid crystal cell LC and the internal frame IF. The light shielding film LS blocks light from the backlight portion at the groove V, and the inner frame IF and the liquid crystal cell LC are bonded to each other by the light shielding film LS at the peripheral portion and the double-sided tape DT at the other portion. Good.

[Backlight section]
As shown in FIGS. 5A and 5C, the light source unit S according to the second embodiment is disposed laterally adjacent to the light guide plate LG, and introduces light to the light guide plate LG to provide the light to the display region DP. appear. In the light source unit S included in the backlight unit, the LED light source units LP in which the LED elements are incorporated are arranged at four locations so as to be aligned along the lateral side wall of the light guide plate LG. The light source unit S forms a light emitting region according to the arrangement of the LED light source unit LP.

  The LED light source portion LP is formed to be thicker than the plate thickness of the light emitting surface LE of the light guide plate LG extending below the display area DP. Thereby, the light source part S forms a level | step difference with LED light source part LP and a part other than that. Specifically, as shown in FIGS. 5A and 5C, the portions other than the LED light source part LP are formed to be thinner than the LED light source part LP, and the LED light source part LP is on the lower side. Protruding protrusions are formed. In the LED light source portion LP protruding downward, the LED element existing in this portion generates more light than the other portions.

  In addition, the light introduction part LI has four raised portions LU according to the position of the LED light source part LP. As shown in FIG. 5A and the like, this raised portion LU forms a slope between the side wall connected to the LED light source portion LP and the light emitting surface LE so that the plate thickness gradually increases as the side wall approaches. Yes. By forming the raised portion LU in the light introducing portion LI, the side shape of the light guide plate LG is formed according to the light emitting region by the LED light source portion LP formed to be thicker than the light emitting surface LE.

  An optical sheet OS is laminated on the light emitting surface LE. As shown in FIG. 5A and the like, each layer of the optical sheet OS is laminated inside an opening formed by a frame formed by the internal frame IF.

  The inner frame IF engages with the four raised portions LU formed in the light introducing portion LI so as to be sandwiched between the raised portions LU when the liquid crystal display device is assembled, as shown in FIG. 4A and the like. The protrusions R1 are formed at three locations.

  Here, FIG. 4B is a diagram illustrating a state in which the light guide plate LG, the internal frame IF, and the flexible printed circuit board F2 connected to the light source unit S in the second embodiment are assembled as seen from above. As shown in the figure, the inner frame IF is formed larger than the outer periphery of the light guide plate LG indicated by a two-dot chain line, and a raised portion LU that is in close contact with the LED light source portion LP is formed inside the through-groove V. The protrusion R1 is engaged.

[External frame]
As shown in FIG. 4A and the like, the external frame OF forms a protrusion R2 that engages with a step formed by the LED light source portion LP and other portions in the light source portion S. By this protrusion R2, the external frame OF is engaged so as to sandwich at least a part of the LED light source part LP. Specifically, as shown in FIG. 4A, the external frame OF has protrusions R2 that are engaged so as to be sandwiched between the four LED light source portions LP at three locations.

  Then, as shown in FIG. 5A, the protrusion R2 of the external frame OF of Embodiment 2 extends until it contacts the light guide plate LG while engaging with the LED light source LP.

  Further, the outer frame OF is provided with an engaging portion Q that engages with the inner frame IF along the outer extension of the outer frame OF formed in a frame shape.

[Flexible printed circuit board]
The flexible printed circuit board F2 is provided so as to be connected to the light source unit S on the side of providing light to the display area DP in the backlight unit. This flexible printed circuit board F2 is provided on the upper surface of the light source part S, and passes through the notch part CO2 formed in a part of the internal frame IF as shown in the developed perspective view of FIG. Stretch outside. The notch CO2 is formed on one side of the internal frame IF that supports the extended portion of the TFT substrate SUB.

  Further, as shown in FIG. 4A, the cutout portion CO2 in the second embodiment is formed on the lower surface of the inner frame IF so as to be continuous with the groove portion V, and is formed on the portion supported by the outer frame OF. A gap through which the substrate F2 passes is formed. As shown in the figure, the cutout portion CO2 is formed in the longitudinal direction toward the outside in the groove portion V of the internal frame IF.

  In addition, the cutout portion CO2 may be provided so as to be missing at a part of the frame formed by the internal frame IF as in the second embodiment, or may be provided so that a part of the frame is not missing. Good.

[Example]
Table 1 is a table comparing the conventional thin liquid crystal display device and the thickness of each member constituting the liquid crystal display device according to the second embodiment. Here, the LCD part, LED part, and internal frame part in Table 1 correspond to, for example, the positions indicated by point X, point Y, and point Z in FIG. 2, and Table 1 describes the thickness at each of these points. Has been. As shown in Table 1, even when the internal frame IF is interposed between the external frame OF and the liquid crystal cell LC to improve the mechanical strength, a liquid crystal display device that is as thin as the conventional one can be configured.

[Embodiment 3]
FIG. 6A is an exploded perspective view of main members of the liquid crystal display device according to Embodiment 3. The liquid crystal display device shown in the figure includes a liquid crystal cell LC, a light shielding film LS, an internal frame IF, an optical sheet OS, a light guide plate LG, a light source part S, an external frame OF, a reflective sheet RS, and flexible printed circuit boards F1 and F2. It is configured to include. A schematic view of the assembled state of each member in the figure from the top is the same as FIG. 2 of the first embodiment. FIG. 6B is a diagram illustrating a state in which the light guide plate LG, the internal frame IF, and the flexible printed circuit board F2 connected to the light source unit S in the third embodiment are assembled.

  7A, 7B, and 7C are cross-sectional views of the AA cross section, the BB cross section, and the CC cross section in the schematic top view of FIG. The main differences between the third embodiment and the first embodiment described above are that the backlight unit (light source unit S and light guide plate LG), the shape of the internal frame IF and the external frame OF, and the light shielding film LS are provided. It is. In the following, these differences will be described, but detailed description of the same parts as those in the first and second embodiments will be omitted.

[Internal frame]
In particular, the inner frame IF in the third embodiment is formed in a frame shape as shown in FIG. 6A, and is located on the inner side of the frame formed by the inner frame IF on one side where the light source part S is disposed below the inner frame IF. Protrusion R3 is provided to extend.

  The protrusion R3 supports a part of the extended portion E of the TFT substrate SUB in the internal frame IF. As shown in FIG. 7A, the protrusion R3 extends inward to engage the LED light source part LP and the light introduction part LI. Specifically, first, in the light source part S included in the backlight part, a step is formed between the LED light source part LP and other parts, and the LED light source part LP is formed thicker than the other parts. Further, the LED light source portion LP is formed to be thicker than the light emitting surface LE, and the raised portion LU is formed so that the light introducing portion LI becomes thicker according to the thickness of the LED light source portion LP.

  FIG. 6B is a view of the assembled state of the light guide plate LG, the internal frame IF, and the flexible printed circuit board F2 connected to the light source unit S according to the third embodiment. As shown in the figure, the inner frame IF is formed larger than the outer periphery of the light guide plate LG indicated by a two-dot chain line, and the LED light source portion LP and the raised portion LU closely contacting the LED light source portion LP are formed in the inner frame IF. It is engaged with a protrusion R3 formed toward the inside.

  As shown in FIGS. 7A and 7C, the inner frame IF has protrusions R3 at three positions between the LED light source portions LP and the raised portions LU formed at four positions so as to be engaged with each other. Forming. By engaging these, the internal frame IF is fixed to the backlight portion.

  In the third embodiment, a light shielding film LS is provided to block light from the light source part S and the light introducing part LI from leaking and entering the liquid crystal cell LC. The light shielding film LS is provided below the extended portion E of the TFT substrate SUB, and prevents light from the light source unit S and the like from entering. Further, as shown in FIG. 6, the light shielding film LS is provided in a frame shape according to the internal frame IF, and the liquid crystal cell LC and the internal frame IF may be bonded, or the extended portion E of the TFT substrate SUB. It may be provided only on the lower side.

[Backlight section]
The light source unit S in the third embodiment is disposed on the side adjacent to the light guide plate LG and introduces light into the light guide plate LG to generate light to be provided to the display region DP.

  In the light source part S included in the backlight part, the LED light source parts LP are arranged at four places as in the case of the second embodiment. However, as shown in FIG. 6 and the like, the second embodiment is characterized in that the flexible printed circuit board F2 is connected to the lower surface thereof and the LED light source portion LP is disposed so as to form a convex portion protruding upward. This is not the case.

  The light introduction part LI has four raised portions LU according to the position of the LED light source part LP, but by forming the LED light source part LP so that the light source part S protrudes upward, The side shapes of the light source part S and the light guide plate LG are substantially the same.

[External frame]
As shown in FIG. 7A and the like, the outer frame OF is provided with an engaging portion Q that engages with the inner frame IF toward the upper side along the outer periphery of the outer frame OF formed in a frame shape. This is the same as in the second embodiment. In the third embodiment, the protrusion R2 in the second embodiment is not formed, but the protrusion R2 may be formed and engaged so that at least a part of the LED light source part LP of the light source part S is sandwiched.

[Flexible printed circuit board]
In the third embodiment, the flexible printed circuit board F2 is provided so as to be connected to the light source unit S on the side opposite to the side that provides light to the display region DP in the backlight unit. The flexible printed circuit board F2 is provided on the lower surface of the light source unit S, and is provided outside the external frame OF via a notch CO3 formed in a part of the external frame OF as shown in FIG. 6A. Stretch.

  As shown in FIG. 6A, the cutout portion CO3 is formed on the lower surface of the outer frame OF so as to open through the opening of the outer frame OF formed in a frame shape. The cutout portion CO3 in the third embodiment is formed in the longitudinal direction toward the outside in a portion where the outer frame OF is fitted with the light source portion S. The cutout portion CO3 is formed so as to create a gap between the reflective sheet RS and the external frame OF, and allow the flexible printed circuit board F2 to pass through the gap. However, the flexible printed circuit board F2 may be extended outward through the lower side of the external frame OF without forming the notch portion CO3.

  In the liquid crystal display device according to each of the embodiments described above, the driving method of the liquid crystal material is any driving method such as an IPS (In-Plane Switching) method, a VA (Vertically Aligned) method, and a TN (Twisted Nematic) method. It may be a method.

  Moreover, in said Embodiment 2 and 3, although LED light source part LP is formed in four places, LED light source part LP is formed in one place of the light source part S formed in the rectangular column shape, and light source part S It is good also as forming a level | step difference with parts other than LED light source part LP. Also in this case, as in the second and third embodiments, the protrusion R1 or the protrusion R2 is formed on the inner frame IF or the outer frame OF so that at least a part of the LED light source LP is sandwiched. Engage with.

  In the second and third embodiments, the LED light source portion LP is formed so as to form a step on the upper surface or the lower surface of the light source portion S formed in a rectangular column shape. However, the LED light source part LP may be provided by being planted at a predetermined interval as a separate member on the flexible printed circuit board F2, for example.

  In Embodiment 2 described above, in the groove portion V formed in the inner frame IF, a protruding portion that protrudes from the outer frame may be formed and engaged so as to sandwich at least a part of the LED light source portion LP. . Further, the protrusions protruding from the outer frame may be further extended so as to be continuous with the inner frame, and the plurality of groove portions V may be formed in the inner frame IF.

  The present invention is not limited to the configuration of the embodiments, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

It is an expansion | deployment perspective view which shows the main members of the liquid crystal display device which concerns on Embodiment 1 of this invention. It is an upper surface schematic diagram which shows an example which looked at the mode of the liquid crystal display device from the upper surface. It is a figure which shows the AA cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 1. FIG. It is a figure which shows the BB cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 1. FIG. It is an expansion | deployment perspective view which shows the main members of the liquid crystal display device which concerns on Embodiment 2 of this invention. 6 is a top view showing a state in which a light guide plate LG, an internal frame IF, and a flexible printed circuit board F2 connected to a light source unit S are assembled according to Embodiment 2. FIG. It is a figure which shows the AA cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 2. FIG. FIG. 6 is a diagram showing a cross section taken along line BB in FIG. 2 of the liquid crystal display device according to the second embodiment. It is a figure which shows CC cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 2. FIG. It is an expansion | deployment perspective view which shows the main members of the liquid crystal display device which concerns on Embodiment 3 of this invention. It is a top view which shows a mode that the light guide plate LG which concerns on Embodiment 3, the internal frame IF, and the flexible printed circuit board F2 connected to the light source part S were assembled. It is a figure which shows the AA cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 3. FIG. It is a figure which shows the BB cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 3. FIG. It is a figure which shows CC cross section in FIG. 2 of the liquid crystal display device which concerns on Embodiment 3. FIG. It is an expansion | deployment perspective view which shows the main members of the conventional liquid crystal display device. It is a figure which shows the AA cross section in FIG. 2 of the conventional liquid crystal display device. It is a figure which shows the BB cross section in FIG. 2 of the conventional liquid crystal display device.

Explanation of symbols

  LC liquid crystal cell, PL1 upper polarizing plate, PL2 lower polarizing plate, SUB TFT substrate, E extension, CF color filter substrate, IF internal frame, OF external frame, S light source, LP LED light source, LG light guide plate, LE Light emitting surface, LI light introducing part, LU raised part, OS optical sheet, F1, F2 flexible printed circuit board, DR driver, RS reflective sheet, DT double-sided tape, LS light shielding film, V groove part, R1, R2, R3 protrusion part, CO1 , CO2, CO3 Notch, Q engaging part, SP spacer.

Claims (8)

A backlight unit that provides light to the display area by surface emitting;
An external frame provided so as to surround the periphery of the backlight portion;
A metal inner frame formed by a plate-like frame supported by the outer frame and opened according to the display area;
A liquid crystal cell that forms the display region by transmitting the light provided from the backlight unit to the liquid crystal material, the edge of which is supported by the inner frame;
A liquid crystal display device comprising: The liquid crystal display device according to claim 1 comprises:
The inner frame blocks light from the backlight unit from entering the edge of the liquid crystal cell;
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1 comprises:
The backlight unit includes a light guide plate in which a light emitting surface for providing light to the display area is formed, and a light source unit that is disposed laterally adjacent to the light guide plate and generates light to be introduced into the light guide plate. And including
The inner frame forms a groove according to a position where the light source unit introduces light into the light guide plate,
The light source unit is formed to be thicker than the plate thickness at the light emitting surface of the light guide plate,
The light guide plate includes a light introduction part into which light is introduced from the light source part, and the light introduction part is formed with a thickness corresponding to the light source part,
At least a part of each of the light introduction part and the light source part is accommodated in the groove part.
A liquid crystal display device characterized by the above. The liquid crystal display device of claim 3
The light source unit includes one or a plurality of LED light source units formed to be thicker than a plate thickness in the light emitting surface of the light guide plate,
The light introducing portion forms one or a plurality of raised portions that are raised with respect to the light emitting surface according to the position of the LED light source portion,
The groove portion is formed with a protruding portion that engages with the raised portion inside.
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1 comprises:
The backlight unit includes one or a plurality of LED light source units that generate light to be provided to the display area,
The inner frame or the outer frame includes a protrusion that engages so as to sandwich at least a part of the LED light source unit.
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 5 is:
The backlight unit further includes a light guide plate disposed laterally adjacent to each of the LED light source units, and having a light emitting surface for providing light introduced from the LED light source unit to the display area. ,
The LED light source unit is formed to be thicker than the plate thickness at the light emitting surface of the light guide plate,
The light guide plate includes a light introduction part that introduces light from the LED light source part, and the light introduction part is raised with respect to the light emitting surface according to the arrangement of the LED light source part, Forming one or more ridges that are formed thicker accordingly,
The inner frame includes a protrusion that engages so as to sandwich at least a part of the LED light source unit,
The protrusion of the inner frame engages with the LED light source and engages with the raised portion of the light guide plate;
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1 comprises:
The inner frame is formed with a notch so as to form a gap in a portion supported by the outer frame,
The backlight unit includes a light source unit that generates light to be provided to the display area, and a flexible printed circuit board that provides power to the light source unit.
The flexible printed circuit board is connected to the light source unit on the side of the backlight unit that provides light to the display area, and extends to the outside of the external frame through at least the gap.
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1 comprises:
The backlight unit includes a light source unit that generates light for providing to the display area, and a flexible printed circuit board that provides power to the light source unit,
The flexible printed circuit board is connected to the light source unit on a side opposite to a side that provides light to the display area of the backlight unit, and is connected to the outside of the external frame via the opposite side of the external frame. Extended,
A liquid crystal display device characterized by the above.

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