KR102505893B1 - Liquid Crystal Display Device - Google Patents

Abstract

In the liquid crystal display device according to the present invention, a holder and an anti-friction part are provided between the inner surface of the cover bottom and the side reflector of the light guide plate to more firmly and elastically support the space between them, and also to prevent damage caused by friction between them. A liquid crystal display device that can be supported at all times is provided.

Description

Liquid crystal display device {Liquid Crystal Display Device}

The present invention relates to a liquid crystal display capable of maintaining a constant support interval between a cover bottom and a light guide plate, and continuously supporting the liquid crystal display in response to deformation or movement occurring therebetween.

BACKGROUND OF THE INVENTION As we enter the information age in earnest, a display field that visually displays electrical information signals is rapidly developing. Accordingly, research is being conducted to develop performance such as thinning, light weight, and low power consumption for various flat display devices.

Representative examples of such a flat panel display are a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescent display device. (Electro Luminescence Display device: ELD), Electro-Wetting Display device (EWD), and Organic Light Emitting Display device (OLED).

These flat panel displays display images using a unique light emitting material or polarizing material interposed between a pair of substrates bonded opposite to each other.

In addition, the liquid crystal display device includes a liquid crystal panel that displays an image using optical anisotropy and polarization properties of liquid crystal. The liquid crystal panel includes a pair of substrates and a liquid crystal layer injected therebetween, and adjusts the light transmittance of each pixel area by adjusting the arrangement direction of liquid crystals. That is, the liquid crystal panel does not generate light by itself, and displays an image by adjusting the amount of light supplied from the outside to be emitted from each pixel area. Therefore, the liquid crystal display device includes a backlight unit for irradiating light to the liquid crystal panel.

Such a liquid crystal display device may be mounted as a part of other electronic devices. That is, the liquid crystal display device is implemented as a device for displaying an image or a device provided as a user interface in various electronic devices such as a navigation device, a laptop computer, or home appliances.

In order to combine the backlight unit and the liquid crystal module on the cover bottom of such a liquid crystal display device, a plurality of fastening or bonding processes are performed organically considering the bonding position or the fastening order. In particular, between the inner side of the cover bottom and the light guide plate A holder is provided to maintain a constant support interval.

However, since the side reflector attached to the outer surface of the light guide plate is made of a thin film material, there is a problem that friction damage occurs while contacting the holder.

In addition, the size or shape of the light guide plate is deformed according to the temperature change, and position movement may occur accordingly. Therefore, it is necessary to develop technology that can prevent damage to the side reflector or light guide plate from occurring due to friction with the holder supporting the light guide plate. situation.

The present invention provides a liquid crystal display that can be supported at all times to prevent damage due to friction to each other while more firmly supporting between them by applying a holder and an anti-friction part between the inner surface of the cover bottom and the side reflector of the light guide plate. do.

In order to solve the above problems, the present invention provides a holder and an anti-friction part between the cover bottom and the light guide plate so that the light guide plate can cope with deformation or movement due to temperature change, and a gap between the side reflector and the cover bottom of the light guide plate is provided. A liquid crystal display device that can be supported at all times is provided.

In addition, when the anti-friction part is applied as a roller member, quality can be improved because it can be supported while responding to the deformation or movement of the light guide plate along the horizontal direction.

According to the liquid crystal display device according to the present invention,

First, quality can be improved by providing a holder between the cover bottom and the light guide plate so that the light guide plate can support each other in response to deformation or movement according to temperature.

Second, it is possible to prevent direct contact between the side reflector provided on the side of the light guide plate and the holder, thereby preventing damage caused by mutual friction.

Third, since the anti-friction part can be applied to existing holders, compatibility is increased.

1 is a cross-sectional view showing a partial cross-section of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is a perspective view illustrating a state in which the holder of the liquid crystal display shown in FIG. 1 and the anti-friction unit are coupled.
3 to 5 are plan views illustrating states of a holder and an anti-friction unit of the liquid crystal display shown in FIG. 2 according to deformation or movement of the light guide plate.
6 is a plan view illustrating a holder and an anti-friction part of a liquid crystal display device according to a second embodiment of the present invention.
FIG. 7 is a plan view illustrating a state in which a holder and an anti-friction unit of the liquid crystal display shown in FIG. 6 are deformed or moved by a light guide plate.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described so that those skilled in the art can easily implement it. It should be noted that the drawing numbers indicated on the components in the accompanying drawings use the same reference numbers as much as possible when indicating the same components in other drawings. In addition, in the description of the present invention, if it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. And certain features presented in the drawings are enlarged, reduced, or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

FIG. 1 is a cross-sectional view showing a partial cross-section of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a holder and an anti-friction part of the liquid crystal display device shown in FIG. 1 are coupled.

Referring to FIGS. 1 and 2 , the liquid crystal display device 100 according to the first embodiment of the present invention has a cover bottom ( 130), the light guide plate 122 provided in the backlight unit, and the inner circumferential surface of the cover bottom are interposed to support each other, and the light guide plate 122 is deformed or moved in a horizontal direction according to temperature change. A holder 140 provided to support the holder 140 while its outer shape is deformed, and an anti-friction unit provided between the holder 140 and the light guide plate 122 to reduce friction generated according to the deformation or movement of the light guide plate 122 ( 150).

The liquid crystal module 110 includes an upper substrate 112 and a lower substrate 111 that are bonded to face each other, and a liquid crystal layer (not shown) is provided between the upper substrate 112 and the lower substrate 111. can In addition, an alignment layer (not shown) disposed on one of the upper and lower surfaces of the liquid crystal layer and initially aligning the liquid crystal inside the liquid crystal layer may be provided, and the upper or lower portion of the liquid crystal module 110 transmits polarized light. A polarization layer (not shown) may be provided.

The liquid crystal module 110 selectively turns on/off a plurality of transistors to form an electric field that changes the arrangement direction of liquid crystals for each pixel area, thereby adjusting the light transmittance of each pixel area to display an image.

In addition, when the liquid crystal module 110 is driven in an active matrix method, the liquid crystal module 110 is formed on one of the upper substrate 112 and the lower substrate 111 . In addition, a plurality of thin film transistors corresponding to a plurality of pixel areas may be further included. Also, when the liquid crystal module 110 displays a color image, the liquid crystal module 110 further includes a color filter layer (not shown) filtering a color corresponding to each pixel area.

The backlight unit 120 is disposed below the liquid crystal module 110 and irradiates light toward the liquid crystal module 110 .

For example, the backlight unit 120 includes a plurality of light sources for emitting light, an LED substrate (LED FPCB) on which the plurality of light sources are mounted, and a light guide plate (LGP) 122 for converting light emitted from the plurality of light sources into a surface light source. ), a plurality of optical sheets 125 disposed between the light guide plate 122 and the liquid crystal module 110, and a reflector 127 disposed below the light guide plate 122.

Each of the plurality of light sources may be a light emitting diode (LED) emitting white light.

The cover bottom supports that the backlight unit 120 is mounted therein and the liquid crystal module 110 is positioned thereon.

At this time, the holder 140 and the anti-friction part 150 are provided between the inner surface of the cover bottom and the outer surface of the light guide plate 122 .

As shown in FIG. 2, the holder 140 is disposed side by side with the first support member 141 contacting in the horizontal direction on the inner circumferential surface of the cover bottom, facing the first support member 141, A second support member 142 supporting the light guide plate 122, and disposed between the first support member 141 and the second support member 142, the first support member 141 and the second support member (142) includes a third support member 143 provided elastically so as to adjust the interval between them. Here, the first support member 141 to the third support member 143 are preferably formed integrally, and at least one of natural rubber or synthetic rubber, silicone-based resin, urethane-based resin, or emulsion-based resin is used as a group. It is made of one material, and therefore has a certain elasticity according to the material characteristics. Then, transmission of shock or vibration between the first support member 141 and the second support member 142 can be effectively blocked. In this way, the holder 140 has elasticity and is disposed between the cover bottom and the light guide plate 122 so that they can always support each other, and the light guide plate 122 is deformed in size according to temperature change or moves at a predetermined interval. Even if the holder 140 is elastic, a gap does not occur at a specific part and they contact each other so that they are always supported.

Steps 1421 are provided at both ends of the second support member 142 to prevent slipping in an area where the holder 140 and the anti-friction part 150 come into contact. For example, when the anti-friction part 150 slips between the second support member 142 and the side reflector 128, the step 1421 prevents friction from the second support member 142. The part 150 can be removed, and in this case, the holder 140 and the side reflector 128 can come into direct contact again, so the anti-friction part 150 is fixed on the second support member 142. is to do Similar to the step 1421, any structure that increases friction between the second support member 142 and the anti-friction part 150 can be applied in a different shape or coupling structure.

In addition, the anti-friction part 150 is made of a synthetic resin material obtained by foaming and molding rubber or plastic. For example, a material such as a porous sponge may be applied. In addition, in the process of supporting each other between the holder 140 and the light guide plate 122, sliding occurs between the holder 140 and the light guide plate 122 in response to the deformation or movement of the light guide plate 122 according to the temperature change. intervened to occur.

3 to 5 are plan views illustrating states of a holder and an anti-friction unit of the liquid crystal display shown in FIG. 2 according to deformation or movement of the light guide plate 122 .

First, referring to FIG. 3 , the holder 140 and the anti-friction part 150 are disposed side by side between the cover bottom and the light guide plate 122 .

At this time, a side reflector 128 is coupled to a side surface of the light guide plate 122 to prevent light from leaking out of the light guide plate 122 . The side reflector 128 has a thin film structure, and when the holder 140 directly contacts it, it can respond to shock or vibration, but the light guide plate 122 slips or slips against deformation or movement ( When slip occurs, the side reflector 128 is damaged. Of course, if the side reflector 128 is not present, the light guide plate 122 may be damaged.

Therefore, the holder 140 provides a function of maintaining an appropriate distance between the cover bottom and the light guide plate 122, and the anti-friction part 150 is provided between the holder 140 and the light guide plate 122, or the A function of minimizing damage caused by mutual friction is provided by causing slip between the holder 140 and the side reflector 128 .

Referring to FIG. 4 , a light pressure is generated between the light guide plate 122 and the holder 140, and a slip occurs between the anti-friction part 150 and the side reflector 128. Since the holder 140 always has a predetermined pressure to support the gap between the cover bottom and the light guide plate 122, when a relative movement occurs between the anti-friction part 150 and the side reflector 128, the friction is prevented. As the shape of the portion 150 is deformed, slippage occurs. Of course, when the deformation or movement of the light guide plate 122 is restored, it returns to its original shape due to the elasticity of the holder 140 or the anti-friction part 150 .

The holder 140 of FIG. 5 shows a state in which the outer shape of the holder 140 is also deformed due to a greater pressure than the state shown in FIG. 4 . At this time, the outer shape of the anti-friction part 150 has already been deformed by sliding, and the holder 140 is also pressed by a greater pressure than this, so that the first support member 141 and the second support member 142 They move in parallel along the longitudinal direction, and the third support member 143 absorbs the pressure while tilting between the first support member 141 and the second support member 142 .

6 is a plan view illustrating a holder and an anti-friction part of a liquid crystal display device according to a second embodiment of the present invention. The same reference numerals as those mentioned below denote the same components.

Referring to FIG. 6 , the anti-friction part 250 of the liquid crystal display device 100 according to the second embodiment of the present invention includes a roller member 251 rotatably coupled on the holder 140, and the roller member It includes a fixing member 252 for fixing 251 on the holder 140.

A plurality of roller members 251 are disposed along the width direction (vertical direction of the length direction) of the second support member 142 and are in line contact with the side reflector 128 . Therefore, as the number of the roller members 251 increases, the area supporting the side reflectors 128 increases, so that the pressure applied to each of the roller members 251 can be reduced. The number of roller members 251 may be set according to the contact area.

The roller member 251 comes into direct contact with the side reflector 128, and since the roller member 251 rotates according to the deformation or movement of the light guide plate 122, it moves relative to each other in the horizontal direction. can respond In addition, the outer circumferential surface of the roller member 251 is deformed according to the applied pressure, and is composed of an elastic material capable of absorbing vibration or impact. Of course, like the anti-friction part 150 of the first embodiment described above, it may be made of a sponge material foamed and molded.

FIG. 7 is a plan view illustrating a state in which the holder and the anti-friction unit of the liquid crystal display shown in FIG. 6 are deformed or moved by the light guide plate 122 .

Referring to FIG. 7 , pressure is applied to the holder 140 and the anti-friction part 250 so that the shape of the holder 140 is deformed, and the roller member 251 also shows a state in which the outer shape is partially deformed. However, since the side reflector 128 and the roller member 251 can move relative to each other while the roller member 251 rotates, the surface of the side reflector 128 is hardly damaged by friction.

As described above, according to the liquid crystal display according to the present invention, the holder 140 suppresses relative movement between the cover bottom and the light guide plate 122 or the side reflector 128, and also prevents deformation or movement. Even when this occurs, they can be supported at all times, and defects can be prevented from occurring. In addition, as the holder 140 is further provided with anti-friction parts 150 and 250, damage caused by friction between the holder 140 and the side reflector 128 is minimized, thereby improving quality. there is

Although the above has been described with reference to the drawings as specific embodiments to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operational effects as the specific embodiments as described above, and various modified examples are within the scope of the present invention. It can be implemented within the limits that do not deviate from. Therefore, such modifications should also be regarded as belonging to the scope of the present invention, and the true technical protection scope of the present invention will be determined by the technical spirit of the claims described later.

100: liquid crystal display
110: liquid crystal module 120: backlight unit
130: cover bottom 140: holder
150, 250: anti-friction part

Claims (8)

liquid crystal module;
a backlight unit radiating light toward the liquid crystal module;
a cover bottom that supports the liquid crystal module or is disposed below the backlight unit to protect the outside;
It is interposed between the light guide plate provided in the backlight unit and the inner circumferential surface of the cover bottom to support each other, and the light guide plate is elastically supported while being deformed in response to deformation or movement in a horizontal direction according to temperature change. holder and
an anti-friction unit disposed between the holder and the light guide plate to reduce friction caused by deformation or movement of the light guide plate;
Including,
A frictional force between the light guide plate and the anti-friction part is smaller than a frictional force between the holder and the light guide plate. The method of claim 1,
the holder,
A first support member contacting the inner circumferential surface of the cover bottom in a horizontal direction;
a second support member disposed side by side to face the first support member and supporting the light guide plate;
and a third support member disposed between the first support member and the second support member and elastically provided to adjust a distance between the first support member and the second support member. The method of claim 2,
the holder,
and a step provided on the second support member to prevent slip from occurring in an area where the anti-friction part and the second support member contact each other. The method of claim 2,
The holder includes at least one material including natural or synthetic rubber, silicone-based resin, urethane-based resin, and emulsion-based resin as a group. The method of claim 2,
The anti-friction part is a liquid crystal display device composed of synthetic resin obtained by foaming and molding rubber or plastic. The method of claim 2,
The anti-friction part,
A roller member rotatably coupled on the second support member;
and a fixing member fixing the roller member on the second support member. The method of claim 6,
The roller member,
A liquid crystal display device made of an elastic material so as to absorb impact while the shape of an outer circumferential surface thereof is deformed when pressure is applied due to deformation or movement of the light guide plate. The method of claim 1,
The liquid crystal display device further includes a side reflector between the light guide plate and the pad part to reflect light toward an inside of the light guide plate.

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