KR102536345B1 - Liquid Crystal Display device having a mold frame - Google Patents

Abstract

A liquid crystal display device is provided. The liquid crystal display device may include a liquid crystal panel, a backlight unit, a mold frame, and a light blocking tape. The liquid crystal panel may include a lower substrate and an upper substrate bonded to the lower substrate. The backlight unit may include a light guide plate positioned on the lower substrate. The mold frame may include a body portion surrounding the light guide plate and sidewall portions protruding from the body portion positioned on three surfaces of the light guide plate except for a light incident surface. The sidewall portion of the mold frame may extend onto a side surface of the lower substrate.

Description

Liquid crystal display device having a mold frame {Liquid Crystal Display device having a mold frame}

The present invention relates to a liquid crystal display device including a mold frame supporting a liquid crystal panel and accommodating at least a portion of a backlight unit.

In general, electronic devices such as monitors, TVs, laptops, digital cameras, and the like include image implementation devices. The image implementation device may include a flat panel display device such as a liquid crystal display device and an organic light emitting display device.

The liquid crystal display device may implement an image by adjusting the transmittance of the liquid crystal. For example, the liquid crystal display device includes a liquid crystal panel including liquid crystal, a backlight unit supplying light to the liquid crystal panel, a mold frame accommodating at least a portion of the backlight unit, and light supplying to a non-display area of the liquid crystal panel. It may include a light-blocking tape to prevent it from being damaged.

The backlight unit may include a light guide plate including a light incident surface, at least one light source positioned on the light incident surface of the light guide plate, and an optical sheet for improving characteristics of light supplied to the liquid crystal panel.

The mold frame may include an inner space for accommodating at least a portion of the backlight unit. For example, the mold frame may include a body portion surrounding the light source and the light guide plate, and a sidewall portion extending from the body portion toward a side surface of the optical sheet.

The light blocking tape may attach the mold frame to the liquid crystal panel. For example, the light blocking tape may be directly adhered to surfaces of the lower substrate of the liquid crystal panel and surfaces of the sidewall portion of the mold frame facing each other.

The mold frame may be formed by injection molding. Accordingly, the thickness of the side wall portion of the mold frame having a relatively small width cannot be reduced below a certain level. Therefore, there is a problem in that the overall thickness of the product cannot be reduced due to the minimum thickness of the sidewall portion of the mold frame even if elements constituting the backlight unit are made slim.

An object to be solved by the present invention relates to a liquid crystal display device in which a decrease in thickness of a backlight unit accommodated in an inner space of a mold frame leads to a slimmer product.

Another problem to be solved by the present invention relates to a liquid crystal display device that efficiently uses the inner space of a mold frame.

The problems to be solved by the present invention are not limited to the aforementioned problems. Subjects not mentioned herein will become clear to those skilled in the art from the following description.

A liquid crystal display device according to the technical idea of the present invention for achieving the above object is a liquid crystal panel including a lower substrate and an upper substrate bonded to the lower substrate; a backlight unit including a light guide plate positioned on the lower substrate; a mold frame including a body portion positioned on a side surface of the light guide plate and a side wall portion extending from the body portion onto a side surface of the lower substrate; and a light-shielding tape positioned between the upper substrate and the side wall portion of the mold frame.

An edge of the upper substrate may vertically overlap the sidewall portion of the mold frame.

The light blocking tape may be directly adhered to surfaces of the upper substrate and the sidewall of the mold frame facing each other.

A side surface of the light blocking tape may be positioned between a side surface of the lower substrate facing each other and a side surface of the side wall portion of the mold frame.

A liquid crystal display device according to the technical idea of the present invention for achieving the other object to be solved is a backlight unit including a light guide plate; a mold frame including a body portion surrounding the light guide plate and sidewall portions protruding from the body portion positioned on three surfaces of the light guide plate except for a light incident surface; a liquid crystal panel including a lower substrate positioned between the sidewall portions of the mold frame and an upper substrate bonded to the lower substrate; a first light-shielding tape positioned between the lower substrate and the body of the mold frame positioned on the light incident surface of the light guide plate; and a second light-shielding tape positioned between the sidewall portion of the mold frame and the upper substrate.

The first light blocking tape and the second light blocking tape may be positioned parallel to each other. The first light blocking tape and the second light blocking tape may be separated from each other.

The liquid crystal display device may further include a third light blocking tape positioned between the first light blocking tape and the second light blocking tape.

The third light blocking tape may be inclined based on the first light blocking tape.

A side surface of the side wall portion of the mold frame facing the light guide plate may be inclined relative to a surface of the body portion of the mold frame facing the lower substrate.

The liquid crystal display device according to the technical concept of the present invention can efficiently use the inner space of the mold frame. Therefore, in the liquid crystal display device according to the technical concept of the present invention, the thickness reduction of the backlight unit can lead to slimming of the product.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 2A is a view showing a cross section taken along line II' of FIG. 1 .
FIG. 2B is a view showing a cross section taken along line II-II' of FIG. 1 .
FIG. 3 is a view showing a cross section taken along the line III-III' of FIG. 2B.
4 is a cross-sectional view of a liquid crystal display according to another embodiment of the present invention.

The above objects and technical configurations of the present invention and details of the operation and effect thereof will be more clearly understood by the following detailed description with reference to the drawings illustrating the embodiments of the present invention. Here, since the embodiments of the present invention are provided to sufficiently convey the technical spirit of the present invention to those skilled in the art, the present invention may be embodied in other forms so as not to be limited to the embodiments described below.

Also, parts denoted by the same reference numerals throughout the specification mean the same components, and the length and thickness of a layer or region in the drawings may be exaggerated for convenience. In addition, when a first component is described as being “on” a second component, the first component is not only located on the upper side in direct contact with the second component, but also the first component and the second component. A case where the third component is located between the second components is also included.

Here, terms such as first and second are used to describe various components, and are used for the purpose of distinguishing one component from another. However, the first component and the second component may be named arbitrarily according to the convenience of those skilled in the art within the scope of the technical idea of the present invention.

Terms used in the specification of the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. For example, a component expressed in the singular number includes a plurality of components unless the context clearly indicates only the singular number. In addition, in the specification of the present invention, terms such as "comprise" or "having" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or It should be understood that it does not preclude the possibility of the presence or addition of more other features, numbers, steps, operations, components, parts, or combinations thereof.

In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the specification of the present invention, in an ideal or excessively formal meaning. not interpreted

(Example)

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 2A is a view showing a cross section taken along line II' of FIG. 1 . FIG. 2B is a view showing a cross section taken along line II-II' of FIG. 1 . FIG. 3 is a view showing a cross section taken along the line III-III' of FIG. 2B.

Referring to FIGS. 1, 2a, 2b, and 3 , the liquid crystal display device according to an embodiment of the present invention may include a liquid crystal panel 100, a backlight unit 200, a mold frame 300, and a light blocking tape 400. there is.

The liquid crystal panel 100 may implement an image by adjusting the transmission oil of the liquid crystal. The liquid crystal panel 100 may include a lower substrate 110 and an upper substrate 120 bonded to the lower substrate 110 . Liquid crystal may be positioned between the lower substrate 110 and the upper substrate 120 .

The lower substrate 110 may be a TFT substrate. For example, on the surface of the lower substrate 110 facing the upper substrate 120, gate lines, data lines crossing the gate lines, and gate lines located at intersections of the gate lines and the data lines Thin film transistors and pixel electrodes individually connected to the thin film transistors may be positioned.

The upper substrate 120 may be a color filter substrate. For example, common electrodes and color filters may be positioned on the surface of the upper substrate 120 facing the lower substrate 110 .

The common electrode may form an electric field with the pixel electrodes. An electric field formed between the common electrode and the pixel electrodes may rotate liquid crystal located in a corresponding region. Transmittance of the liquid crystal rotated by the electric field may be changed.

The color filters may allow light passing through the liquid crystal to have a specific color. For example, each color filter can transmit only light of a specific wavelength. The color filters may include red color filters, green color filters, and blue color filters. Each color filter may be positioned to face a corresponding pixel electrode.

The liquid crystal panel 100 may further include a driver IC 115. The driver IC 115 may control thin film transistors positioned on the lower substrate 110 . The driver IC 115 may be mounted on the same surface as the thin film transistors. For example, the driver IC 115 may be located on a surface of the lower substrate 110 facing the upper substrate 120 . The upper substrate 120 may expose a predetermined area of the lower substrate 110 where the driver IC 115 is located.

The liquid crystal panel 100 may further include a lower polarizing plate 130 and an upper polarizing plate 140 . The lower polarizing plate 130 may be positioned on the lower substrate 110 . The upper polarizing plate 140 may be positioned on the upper substrate 120 . For example, the lower substrate 110 and the upper substrate 120 may be positioned between the lower polarizing plate 130 and the upper polarizing plate 140 .

The lower polarizer 130 and the upper polarizer 140 may polarize transmitted light. The upper polarizer 140 may polarize light in a direction different from that of the lower polarizer 130 . For example, the upper polarizer 140 may polarize light in a direction perpendicular to the lower polarizer 130 .

The backlight unit 200 may supply light to the liquid crystal panel 100 . For example, the backlight unit 200 may be positioned on the lower substrate 110 of the liquid crystal panel 100 . The backlight unit 200 may include a light source assembly 210 , a light guide plate 220 , a reflector 230 and an optical sheet 240 .

The light source assembly 210 may generate light to be supplied to the liquid crystal panel 100 . For example, the light source assembly 210 may include a printed circuit board 212 including at least one light source 211 and a circuit for controlling the light source 211 . The light source 211 may be mounted on the printed circuit board 212 . For example, the light source 211 may include an LED lamp.

The light guide plate 220 may supply light generated by the light source assembly 210 to the entire liquid crystal panel 100 . For example, the light source 211 may be located on one side of the light guide plate 220 . A side surface of the light guide plate 220 facing the light source 211 may be defined as a light incident surface LS.

The reflection plate 230 can improve the efficiency of light supplied from the light guide plate 220 to the liquid crystal panel 100 . For example, the reflector 230 may reflect light emitted from the light guide plate 220 in a direction opposite to the liquid crystal panel 100 toward the liquid crystal panel 100 . The light guide plate 220 may be positioned between the liquid crystal panel 100 and the reflector 230 .

The optical sheet 240 may improve characteristics of light supplied from the light guide plate 220 to the liquid crystal panel 100 . The optical sheet 240 may be positioned between the liquid crystal panel 100 and the light guide plate 220 . For example, the optical sheet 240 may include a diffusion sheet 241 , a lower prism sheet 242 , and an upper prism sheet 243 sequentially stacked.

The diffusion sheet 241 can improve the uniformity of light passing through the liquid crystal panel 100 . For example, the diffusion sheet 241 may diffuse light emitted from the light guide plate 220 .

The lower prism sheet 242 and the upper prism sheet 243 may improve luminance of light passing through the diffusion sheet 241 . For example, the lower prism sheet 242 and the upper prism sheet 243 may condense light traveling toward the liquid crystal panel 100 .

The mold frame 300 may include an inner space 300s in which at least a part of the backlight unit 200 is accommodated. For example, the light source assembly 210, the light guide plate 220, and the optical sheet 230 of the backlight unit 200 may be located in the inner space 300s of the mold frame 300.

The mold frame 300 may include a body portion 301 and a side wall portion 302 . The body part 301 may be located on a side surface of the light guide plate 220 . A side surface of the light guide plate 220 may be surrounded by the body portion 301 of the mold frame 300 . The side wall portion 302 may protrude from the body portion 301 positioned on three surfaces of the light guide plate 220 except for the light incident surface LS. The side wall portion 302 may extend onto a side surface of the optical sheet 240 . The optical sheet 240 may be positioned between the side wall portions 302 of the mold frame 302 .

The side wall portion 302 may be integral with the body portion 301 . For example, the sidewall portion 302 may include the same material as the body portion 301 . The side wall portion 302 may be physically connected to the body portion 301 . A width of the side wall portion 302 may be smaller than a width of the body portion 301 .

The side wall portion 302 of the mold frame 300 may extend onto a side surface of the lower substrate 110 of the liquid crystal panel 100 . The lower substrate 110 may be positioned between the side wall portions 302 of the mold frame 300 .

The upper substrate 120 may extend onto the side wall portion 302 of the mold frame 300 . For example, an edge of the upper substrate 120 may vertically overlap the side wall portion 302 of the mold frame 300 . The driver IC 115 may be positioned on the lower substrate 100 vertically overlapping the body 301 of the mold frame 300 positioned on the light incident surface LS of the light guide plate 220. can

In the liquid crystal display device according to the embodiment of the present invention, the side wall portion 302 of the mold frame 300 may support the upper substrate 120 of the liquid crystal panel 100 . That is, in the liquid crystal display according to the embodiment of the present invention, the lower substrate 110 of the liquid crystal panel 100 may be accommodated in the inner space 300s of the mold frame 300 . Accordingly, in the liquid crystal display device according to the embodiment of the present invention, the thickness of the product can be lower than the limit set by the minimum thickness of the side wall portion 302 of the mold frame 300 . Therefore, in the liquid crystal display device according to the embodiment of the present invention, the reduction in thickness of the backlight unit 200 can lead to slimming of the product.

The mold frame 300 may be fixed on the reflector 230 . The reflection plate 230 may have a larger area than the light guide plate 220 . The liquid crystal display according to the embodiment of the present invention may further include an adhesive member 500 positioned between the reflector 230 and the mold frame 300 .

The mold frame 300 may further include an accommodation groove into which the light source 211 of the light source assembly 210 is inserted. The receiving groove of the mold frame 300 may be opened only in the direction of the light incident surface LS of the light guide plate 220 . Light generated by the light source 211 may propagate only in the direction of the light incident surface LS of the light guide plate 220 by the mold frame 300 .

The printed circuit board 212 of the light source assembly 210 may be positioned on the body part 301 of the mold frame 300 positioned on the light incident surface LS of the light guide plate 220. . For example, the printed circuit board 212 may be positioned on a surface of the body portion 301 of the mold frame 300 facing the lower substrate 110 .

The light blocking tape 400 may prevent light from being supplied to the non-display area of the liquid crystal panel 100 from the backlight unit 200 . For example, the light blocking tape 400 may be positioned between the liquid crystal panel 100 and the mold frame 300 . The light blocking tape 400 may include a first light blocking tape 410 and a second light blocking tape 420 .

The first light blocking tape 410 is the body portion of the mold frame 300 positioned on the lower substrate 110 of the liquid crystal panel 100 and the light incident surface LS of the light guide plate 220 ( 301) may be located between. The first light blocking tape 410 may be positioned between the lower substrate 110 and the printed circuit board 212 of the light source assembly 210 . The first light blocking tape 410 may be directly adhered to surfaces of the lower substrate 110 and the printed circuit board 212 facing each other. For example, the first light blocking tape 410 may be a double-sided tape.

The second light blocking tape 420 may be positioned between the upper substrate 120 of the liquid crystal panel 100 and the side wall portion 302 of the mold frame 300 . The second light-shielding tape 420 may be directly adhered to the surface of the upper substrate 120 and the surface of the side wall portion 302 of the mold frame 300 facing each other. For example, the second light blocking tape 420 may be a double-sided tape. The second light blocking tape 420 may be positioned parallel to the first light blocking tape 410 .

The second light blocking tape 420 may include the same material as the first light blocking tape 410 . The thickness of the second light blocking tape 420 may be the same as that of the first light blocking tape 410 .

In the liquid crystal display according to the embodiment of the present invention, a side surface of the second light-shielding tape 420 facing the side surface of the lower substrate 110 may be positioned close to the lower substrate 110 . For example, in the liquid crystal display device according to the embodiment of the present invention, the side surface of the lower substrate 110 and the side wall portion 302 of the mold frame 300 face each other. ) may be located between the side surfaces 302S. Therefore, in the liquid crystal display according to the exemplary embodiment of the present invention, light emitted in directions of three surfaces of the light guide plate 220 excluding the light incident surface LS is effectively prevented from being supplied to the non-display area of the upper substrate 120. can do.

In the liquid crystal display device according to the embodiment of the present invention, the second light blocking tape 420 may be spaced apart from the first light blocking tape 410 . That is, in the liquid crystal display according to the embodiment of the present invention, the first light blocking tape 410 and the second light blocking tape 420 may be separated from each other. Accordingly, in the liquid crystal display device according to the embodiment of the present invention, the first light blocking tape 410 and the second light blocking tape 420 may be assembled through separate processes. Therefore, in the liquid crystal display device according to the embodiment of the present invention, the deformation of the light blocking tape 400 due to the step between the assembly position of the first light blocking tape 410 and the assembly position of the second light blocking tape 420 is prevented. It can be prevented.

In the liquid crystal display according to the embodiment of the present invention, it will be described that the first light blocking tape 410 and the second light blocking tape 420 are separated. However, as shown in FIG. 4 , in the liquid crystal display according to the embodiment of the present invention, the light blocking tape 400 is positioned between the first light blocking tape 410 and the second light blocking tape 420. 3 A light blocking tape 430 may be further included. Accordingly, in the liquid crystal display device according to another embodiment of the present invention, deformation of the light blocking tape 400 due to a step between the assembly position of the first light blocking tape 410 and the assembly position of the second light blocking tape 420 can be prevented, and the assembly process can be simplified.

The third light blocking tape 430 may include the same material as the first light blocking tape 410 and the second light blocking tape 420 . A thickness of the third light blocking tape 430 may be the same as that of the first light blocking tape 410 and the second light blocking tape 420 . For example, the third light blocking tape 430 may be integral with the first light blocking tape 410 and the second light blocking tape 420 .

The third light blocking tape 430 may be inclined based on the first light blocking tape 410 . The third light blocking tape 430 may be spaced apart from the side surface 302S of the side wall portion 302 of the mold frame 300 facing the light guide plate. Accordingly, in the liquid crystal display device according to another embodiment of the present invention, deformation of the light blocking tape 400 is prevented, the assembly process of the light blocking tape 400 is simplified, and the assembly process of the light blocking tape 400 is easily performed. can improve

In addition, in the liquid crystal display device according to another embodiment of the present invention, as shown in FIG. 4 , the side surface 302S of the side wall portion 302 of the mold frame 300 facing the light guide plate faces the lower substrate 110. It may be inclined based on the surface of the body portion 301 of the mold frame 300 . Accordingly, in the liquid crystal display device according to another embodiment of the present invention, the slope of the third light blocking tape 430 connecting the first light blocking tape 410 and the second light blocking tape 420 may be gentle. Therefore, in the liquid crystal display device according to another embodiment of the present invention, the assembly process of the light blocking tape 400 can be easily performed.

As a result, in the liquid crystal display device according to the embodiment of the present invention, the side wall portion 302 of the mold frame 300 supports the upper substrate 120 of the liquid crystal panel 100, so that the thickness of the backlight unit 200 is reduced. At the same time, the second light-shielding tape 420 positioned between the upper substrate 120 and the sidewall portion 302 of the mold frame 300 is connected to the light guide plate 220 to be connected to the light entrance surface LS. ) is separated from the first light-shielding tape 410 positioned between the body portion 301 of the mold frame 300 and the lower substrate 110 of the liquid crystal panel 100, or the third light-shielding tape By connecting through 430, the light blocking tape 400 can be easily assembled without deformation.

100: liquid crystal panel 200: backlight unit
220: light guide plate 300: mold frame
301: body part 302: side wall part
400: light blocking tape 410: first light blocking tape
420: second light blocking tape

Claims (9)

a liquid crystal panel including a lower substrate on which a driver IC is located and an upper substrate bonded to the lower substrate;
a backlight unit positioned on the lower substrate and including a reflector, a light guide plate positioned on the reflector, and a light source assembly positioned on a light incident surface of the light guide plate;
A body portion located on the reflection plate and surrounding the side surface of the light guide plate and a side wall portion extending from a first region of the body portion located on three surfaces of the light guide plate excluding the light incident surface to the side surface of the lower substrate. mold frame; and
A light-shielding tape positioned on an upper surface of the sidewall portion of the mold frame facing the liquid crystal panel,
The light source assembly overlapping the driver IC includes a printed circuit board positioned on a second area of the body portion corresponding to the light incident surface of the light guide plate and a light source mounted on the printed circuit board;
The second region of the body portion includes a receiving groove into which the light source of the light source assembly is inserted,
three surfaces of the upper substrate that do not face the driver IC extend from a side surface of the lower substrate, so that the upper substrate includes an area overlapping the light-shielding tape;
The lower substrate is located in a space formed by the side wall portion of the mold frame. According to claim 1,
An edge of the upper substrate vertically overlaps the sidewall portion of the mold frame. According to claim 1,
The light blocking tape is directly adhered to the surface of the upper substrate and the surface of the sidewall portion of the mold frame facing each other. According to claim 1,
A side surface of the light blocking tape is positioned between a side surface of the lower substrate facing each other and a side surface of the side wall portion of the mold frame. a backlight unit including a reflector, a light guide plate positioned on the reflector, and a light source assembly positioned on a light incident surface of the light guide plate;
a mold frame positioned on the reflection plate and including a body portion surrounding the light guide plate and a side wall portion protruding from a first region of the body portion positioned on three surfaces of the light guide plate excluding the light incident surface;
a liquid crystal panel including a lower substrate on which a driver IC overlaps with the light source assembly and an upper substrate bonded to the lower substrate;
a first light-shielding tape positioned on a second region of the body portion positioned on the light incident surface of the light guide plate; and
A second light-shielding tape positioned on the sidewall portion of the mold frame,
The upper substrate extending from the side surface of the lower substrate onto the first region of the body portion includes an area overlapping the second light-shielding tape,
The light source assembly includes a printed circuit board positioned between the second area of the body and the first light-shielding tape and a light source mounted on the printed circuit board,
The second region of the body portion includes a receiving groove into which the light source of the light source assembly is inserted,
The lower substrate is positioned in a space formed by the side wall portion of the mold frame. According to claim 5,
The first light blocking tape and the second light blocking tape are positioned parallel to each other, but are separated from each other. According to claim 5,
The liquid crystal display device further comprises a third light blocking tape positioned between the first light blocking tape and the second light blocking tape. According to claim 7,
The third light blocking tape is inclined with respect to the first light blocking tape. According to claim 7,
A side surface of the side wall portion of the mold frame facing the light guide plate is inclined relative to a surface of the body portion of the mold frame facing the lower substrate.

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