JP4188105B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device that converts linear light from a linear light source body into a planar light source by a planar light source converter and irradiates a liquid crystal panel.
[0002]
[Prior art]
Conventionally, this type of liquid crystal display device is provided with a rectangular flat liquid crystal panel, and this liquid crystal panel is a shield case as a rectangular frame-shaped case body provided with a wall portion along the circumferential direction on the outer peripheral edge. Is housed inside. A backlight as a surface light source device is accommodated on the back side of the liquid crystal panel in the shield case. This backlight includes a discharge lamp as an elongated cylindrical linear light source that emits linear light. At both ends in the axial direction of the discharge lamp, rubber caps as cap bodies having insulating properties and elasticity are respectively attached (for example, see Patent Document 1).
[0003]
Further, the discharge lamp of this type of liquid crystal display device is accommodated in the shield case along the wall portion in a state of being opposed to the inside of the wall portion of the lower edge of the shield case. For this reason, the cap bodies attached to both end portions of the discharge lamp are accommodated inside the both end portions in the longitudinal direction of the wall portion of the shield case in a state facing the inner side surface of the wall portion.
[0004]
Further, the discharge lamp has a light guide plate as a rectangular plate-like planar light source conversion body that converts linear light from the discharge lamp into a planar light source with one end directed to the discharge lamp. It is attached. The light guide plate is accommodated on the back side of the liquid crystal panel along the liquid crystal panel accommodated in the shield case (see, for example, Patent Document 2).
[0005]
[Patent Document 1]
JP 2001-194666 (5th page and FIG. 1)
[0006]
[Patent Document 2]
Japanese Patent Laid-Open No. 11-52373 (page 2-3 and FIG. 1)
[0007]
[Problems to be solved by the invention]
However, in the above-described liquid crystal display device, when the discharge lamp is accommodated inside the wall portion located below the shield case with the surface direction of the shield case facing the vertical direction, When a strong impact is applied from the upper side to the lower side, the light guide plate in the shield case comes into contact with each rubber cap. For this reason, stress is applied to the discharge lamps whose both ends are supported by these rubber caps due to the pressing of the rubber caps by these light guide plates.
[0008]
Further, when the rubber cap comes into contact with the inside of the lower wall portion of the shield case due to the pressure applied to the rubber cap by the light guide plate in the shield case, stress is applied from the wall portion to the rubber cap. For this reason, these rubber caps are pinched | interposed into the wall part of a shield case, and a light guide with the stress to the rubber cap from this wall part. Therefore, stress is applied to the discharge lamp supported at both ends by these rubber caps, and the discharge lamp may be damaged. Therefore, it is difficult to prevent the discharge lamp from being damaged. Yes.
[0009]
The present invention has been made in view of such a point, and an object thereof is to provide a liquid crystal display device capable of preventing damage to a linear light source body.
[0010]
[Means for Solving the Problems]
The present invention includes a substantially rectangular frame-shaped case body provided with a wall portion bent from an outer peripheral edge provided around an opening formed on the surface, and the wall portion along the wall portion of the case body. A cylindrical linear light source body that radiates linear light, and a cap body that is attached to an end of the linear light source body in the axial direction and is disposed inside the wall portion And a planar light source conversion body having a substantially rectangular plate shape that is arranged in the case along the axial direction of the linear light source body and converts linear light from the linear light source body into a planar light source, A substantially rectangular flat liquid crystal panel that is disposed in the case so as to face the planar light source conversion body and is irradiated with the planar light source converted by the planar light source conversion body, and the line of the case body Jo light source is provided in the wall portion of the side to be arranged, the wall so as to correspond to the cap body disposed inside the wall portion Is the distal cut proximally from lack formed, and in which the cap member in the longitudinal direction of the cap body is provided with a set cutout recess to possible exposure dimensions.
[0011]
Then, the linear light source body is disposed inside the wall portion along the wall portion bent from the outer peripheral edge around the opening of the case body, and is attached to the axial end portion of the linear light source body. The wall portion of the case body was cut out from the distal end side to the proximal end side so as to correspond to the cap body so as to expose the cap body in the longitudinal direction of the cap body, thereby forming a notch recess. Therefore, when an impact is applied to the case body toward the side on which the linear light source body is disposed, the planar light source conversion body disposed in the case along the axial direction of the linear light source body The impact transmitted to the cap body via the cutout recess of the case body is difficult to be transmitted to the wall portion of the case body. For this reason, damage to the linear light source body due to stress on the cap body from the wall portion of the case body, which may occur upon impact to the case body toward the side where the linear light source body is disposed, is prevented. Is done.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of an embodiment of the liquid crystal display device of the present invention will be described below with reference to FIGS.
[0013]
1 to 7, reference numeral 1 denotes a liquid crystal display device as a transmissive or transflective flat display device. The liquid crystal display device 1 includes a liquid crystal panel 2 used for a so-called notebook personal computer or the like. . The liquid crystal panel 2 is formed in a rectangular flat plate shape, and is an active matrix type having a thin film transistor (TFT) as a switching element for each display pixel. The liquid crystal panel 2 displays a desired image on a display unit provided at the center of the surface by an electric signal supplied from a drive circuit board (not shown).
[0014]
On the other hand, on the back side of the liquid crystal panel 2, a backlight 3, which is a surface light source device that irradiates the liquid crystal panel 2 with planar light, is disposed to face the liquid crystal panel 2. The backlight 3 includes an elongated cylindrical discharge lamp 4 that is a lamp body as a linear light source that emits and emits linear light. Both end portions in the axial direction of the discharge lamp 4 are sealed in a spherical shape to form a sealing portion 5.
[0015]
Each of these sealing portions 5 is fitted in a fitting concave portion 7 having a circular cross section opened at one end portion in the longitudinal direction of a rubber cap 6 as a cap body having an elongated rectangular cross section. The fitting recess 7 has an axial direction along the longitudinal direction of each rubber cap 6, and has an inner diameter that is slightly smaller than the outer diameter of the discharge lamp 4.
[0016]
Further, a light as a planar light source conversion body that converts linear light emitted from the discharge lamp 4 into a planar light source that is planar light is provided on a side portion along the radial direction of the discharge lamp 4. One side surface in the surface direction of the rectangular flat light guide plate 8 serving as a guide is arranged to face each other. The light guide plate 8 is disposed along the axial direction of the discharge lamp 4 in a state where the longitudinal direction is positioned parallel to the axial direction of the discharge lamp 4. Further, the light guide plate 8 is fixed to face the back side of the display unit of the liquid crystal panel 2.
[0017]
In addition, a special prism (not shown) is integrally formed on the rear surface side of the light guide plate 8 opposite to the side disposed opposite to the rear surface of the liquid crystal panel 2. As it moves away from the lamp 4, it is gradually changed and formed in a staircase shape. The light guide plate 8 is a resin molded material formed of a heat-resistant transparent resin such as polycarbonate, acrylic, or cycloolefin polymer.
[0018]
Further, the opposite side of the light guide plate 8 in the discharge lamp 4 is covered with a reflector (not shown) which is a high reflectivity metal plate. This reflector covers the discharge lamp 4 along the circumferential direction of the discharge lamp 4 with respect to the lower end of the light guide plate 8 in the vertical direction, and the light from the discharge lamp 4 is reflected to guide the light guide plate 8 side. The light diffused in the direction other than is reflected toward the light guide plate 8 side with a high reflectance.
[0019]
On the other hand, the liquid crystal panel 2 that is modularized with the backlight 3 fixed on the back side is housed inside a shield case 11 that is a cell case as a rectangular frame case body. The outer peripheral edge provided around the opening 13 formed on the surface of the shield case 11 has an outer periphery which is a wall portion as a rectangular cylindrical peripheral edge protruding perpendicularly along the circumferential direction of the outer peripheral edge. The piece 12 is bent and provided integrally. The opening 13 is provided at the center of the surface of the shield case 11, and is formed in a rectangular shape that exposes the display portion of the liquid crystal panel 2 accommodated on the surface of the shield case 11 to the outside. Yes. Further, the opening 13 has a width dimension smaller than the width dimension of the liquid crystal panel 2 and a longitudinal dimension smaller than the longitudinal dimension of the liquid crystal panel 2.
[0020]
In the shield case 11, the liquid crystal panel 2 and the backlight 3 fixed to the back side of the liquid crystal panel 2 are arranged with the display portion of the liquid crystal panel 2 facing the opening 13. Is housed. Here, as shown in FIGS. 1 to 3, the discharge lamp 4 of the backlight 3 is an inner surface of the outer peripheral piece portion 12 positioned on the lower side as one side in the vertical direction that is the width direction of the shield case 11. The outer peripheral piece 12 is disposed so as to face the inner side of the outer peripheral piece 12 with the axial direction thereof being aligned.
[0021]
Further, the rubber caps 6 attached to both ends of the discharge lamp 4 have the width direction along the inner side surface of each outer peripheral piece 12 positioned at both ends in the left-right direction which is the longitudinal direction of the shield case 11. In this state, the outer peripheral piece 12 is disposed on the lower side, which is one end in the longitudinal direction. Each of the rubber caps 6 is opposed to the inner side of the outer peripheral piece 12 in a state where the longitudinal direction is along the inner surface of the outer peripheral piece 12 positioned below the shield case 11. The portions 12 are disposed on both ends in the longitudinal direction.
[0022]
Furthermore, the both ends in the longitudinal direction of the outer peripheral piece 12 located on the lower side of the shield case 11 are both ends in the longitudinal direction of the outer peripheral piece 12 and one side in the width direction of the outer peripheral piece 12. A notch recess 14 is formed in a stepped shape toward a certain tip side. In other words, these notch recesses 14 are provided on the outer peripheral piece 12 positioned on the lower side, which is the side where the discharge lamp 4 is accommodated oppositely, and are formed on the rubber cap 6 accommodated in the shield case 11. Opposite cut out.
[0023]
These notch recesses 14 have a width dimension that is at least one half of the height dimension of the outer peripheral piece 12 of the shield case 11, preferably one half. Specifically, the cutout recesses 14 are formed in the shield case 11 while supporting the lower end edge of the liquid crystal panel 2 accommodated in the shield case 11 with the outer peripheral piece 12 on the base end side of the cutout recesses 14. The rubber cap 6 accommodated in the housing has a width dimension that exposes the whole in the width direction. That is, the height dimension of the outer peripheral piece 12 on the base end side of the notch recess 14 is made larger than the thickness dimension of the liquid crystal panel 2.
[0024]
Moreover, these notch recessed parts 14 have a longitudinal dimension of 1/5 or more and 1/3 or less of the longitudinal dimension of the outer periphery piece part 12, More preferably, 1/3. Specifically, the longitudinal dimensions of the cutout recesses 14 are larger than the longitudinal dimensions of the rubber caps 6 so that the rubber caps 6 accommodated in the shield case 11 are exposed in the longitudinal direction. That is, when the liquid crystal panel 2 is A4 size, these notch recesses 14 are notched toward the inside of the rubber cap 6 accommodated in the shield case 11 by 10 mm or more, for example. More preferred.
[0025]
Further, a step projecting toward the front end side rather than the end side in the longitudinal direction of the outer peripheral piece portion 12 on the inner side of the cutout recess 14 located on the left side when viewed from the front side facing the front end side of the outer peripheral piece portion 12. A stepped protrusion 15 is formed. These stepped protrusions 15 have a width dimension so as to cover a part of the outer peripheral surface of the discharge lamp 4 accommodated in the shield case 11. Further, these stepped protrusions 15 are formed on the inner side of the rubber cap 6 accommodated in the shield case 11. Therefore, these stepped protrusions 15 cover only a part of the outer peripheral surface of the discharge lamp 4 accommodated in the shield case 11.
[0026]
Next, the operation of the liquid crystal display device according to the embodiment will be described.
[0027]
First, the linear light emitted from the discharge lamp 4 is irradiated to the lower side of the light guide plate 8 by reflection by the reflector and is incident on the inside of the light guide plate 8.
[0028]
Then, the light incident on the inside of the light guide plate 8 is converted into a planar shape by optical path conversion by the prism of the light guide plate 8 and is irradiated to the back side of the liquid crystal panel 2.
[0029]
Thereafter, the liquid crystal panel 2 is controlled to transmit and block the planar light irradiated on the liquid crystal panel 2 so that the image displayed on the liquid crystal panel 2 is visually recognized by the user. The
[0030]
As described above, according to the above-described embodiment, when an impact is applied from the outer side of the outer peripheral piece 12 positioned on the upper side of the shield case 11 toward the lower side of the shield case 11, the impact is applied to the shield case. 11 is transmitted to the light guide plate 8 through the outer peripheral piece 12 on the upper side of 11, and is transmitted to each rubber cap 6 attached to both ends of the discharge lamp 4 via the light guide plate 8, and between these rubber caps 6. Stress is applied to the discharge lamp 4 located in the position.
[0031]
At this time, a notch recess 14 is formed at both ends of the outer peripheral piece 12 on the lower side of the shield case 11 at positions facing the rubber cap 6 accommodated in the shield case 11, and the notch recess 14 is formed in the shield case. The outer peripheral piece 12 was cut into a stepped shape toward the front end side and the end side in the longitudinal direction.
[0032]
For this reason, each notch recess 14 provides the outer peripheral piece 12 with a flexible rigidity, so that the impact transmitted from the upper side of the shield frame 11 to each rubber cap 6 via the light guide plate 8 can be obtained. It is possible to prevent direct transmission to 12. Therefore, an impact from the upper side of the shield case 11 may be caused by being transmitted to the lower outer peripheral piece 12 of the shield case 11 through the light guide plate 8 and the rubber cap 6. Generation of stress from the piece 12 to the rubber cap 6 can be prevented.
[0033]
Therefore, these rubbers can be generated by the rubber cap 6 being sandwiched in the vertical direction between the outer peripheral piece 12 and the light guide plate 8 due to the stress on the rubber cap 6 from the lower outer peripheral piece 12. It is possible to efficiently prevent damage such as cracks at the ends of the discharge lamp 4 located between the caps 6. For this reason, since damage to the liquid crystal display device 1 including the shield case 11 in which the cutout recess 14 is formed can be prevented, a higher quality liquid crystal display device 1 can be reliably manufactured with a simple configuration.
[0034]
Further, since the cutout recesses 14 are formed in both end portions of the outer peripheral piece portion 12 on the lower side of the shield case 11 and both end portions of the outer peripheral piece portion 12 are cut out, the weight of the shield case 11 can be reduced.
[0035]
Further, the notch recess 14 provided in the outer peripheral piece 12 on the lower side of the shield case 11 is accommodated in the shield case 11 while supporting the lower end edge of the liquid crystal panel 2 accommodated in the shield case 11. The width dimension of the rubber cap 6 that exposes the whole in the width direction, specifically, the width dimension of about one half of the height dimension of the outer peripheral piece 12 of the shield case 11 was set.
[0036]
As a result, the entire bottom end portion of the liquid crystal panel 2 accommodated in the shield case 11 is supported by the base end side of the cutout recess 14 in the outer peripheral piece 12 on the lower side of the shield case 11 while the shield case 11 is supported. While maintaining the rigidity of the shield 11 to some extent, the respective cutout recesses 14 of the shield case 11 can prevent the discharge lamp 4 from being damaged by an impact from above the shield case 11.
[0037]
In order to secure a certain degree of rigidity of the outer peripheral piece 12 on the lower side of the shield case 11, it is desirable that the longitudinal dimension of each notch recess 14 is set to one third or less of the longitudinal dimension of the outer peripheral piece 12. Furthermore, in order to efficiently prevent damage to the discharge lamp 4 due to an impact from above the shield case 11, the longitudinal dimension of each notch recess 14 is set to one fifth or more of the longitudinal dimension of the outer peripheral piece 12, and It is desirable that the width dimension of each notch recess 14 is at least half the height dimension of the outer peripheral piece 12.
[0038]
【The invention's effect】
According to the present invention, the wall portion of the case body is arranged so as to correspond to the cap body attached to the end portion in the axial direction of the linear light source body arranged inside the wall portion along the wall portion of the case body. From the front end side to the base end side, the cap body is cut out to a dimension that can be exposed along the longitudinal direction of the cap body , so that a notch recess is formed, so that the case is directed toward the side where the linear light source body is disposed. When an impact is applied to the body, the impact transmitted to the cap body via the planar light source conversion body arranged in the case can be made difficult to be transmitted to the wall of the case body by the notch recess. It is possible to prevent the linear light source body from being damaged by the stress applied to the cap body from the body wall.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view showing an embodiment of a liquid crystal display device of the present invention.
FIG. 2 is an explanatory front view showing the liquid crystal display device.
FIG. 3 is an explanatory sectional view showing the same liquid crystal display device.
FIG. 4 is a front view showing a part of the liquid crystal display device.
FIG. 5 is a lower side view showing a part of the same liquid crystal display device.
FIG. 6 is a front view showing a case body of the liquid crystal display device.
FIG. 7 is a lower side view showing the case body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 4 Discharge lamp 6 as a linear light source body 6 Rubber cap as a cap body 8 Light guide plate as a planar light source converter
11 Shield case as case body
12 Perimeter piece as wall
13 opening
14 Notch recess

Claims (4)

A substantially rectangular frame-shaped case body provided with a wall portion bent from an outer peripheral edge provided around an opening formed on the surface;
A cylindrical linear light source body that is disposed inside the wall portion along the wall portion of the case body and irradiates linear light,
A cap body attached to the axial end of the linear light source body and disposed inside the wall; and
A planar light source conversion body having a substantially rectangular flat plate shape that is disposed in the case along the axial direction of the linear light source body and converts linear light from the linear light source body into a planar light source;
A substantially rectangular flat liquid crystal panel that is disposed in the case facing the planar light source converter and irradiated with the planar light source converted by the planar light source converter;
Provided on the wall portion of the case body on the side where the linear light source body is disposed, and from the distal end side to the proximal end side of the wall portion so as to correspond to the cap body disposed on the inner side of the wall portion A liquid crystal display device comprising: a notch formed in a notch and having a dimension that allows the cap body to be exposed in the longitudinal direction of the cap body . 2. The liquid crystal display device according to claim 1, wherein a longitudinal dimension of the notch recess is 1/5 or more and 1/3 or less of a longitudinal dimension of the wall portion of the case body . The liquid crystal display device according to claim 1 or 2 , wherein a width dimension of the notch recess is at least half of a height dimension of the wall part. The liquid crystal display device according to any one of claims 1 to 3 , wherein a height dimension of a wall portion on a base end side of the notch recess is larger than a thickness dimension of the liquid crystal panel.

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