KR20090042509A - Liquid crystal display device module - Google Patents

Abstract

A liquid crystal display device module is provided to prevent wrinkles of an optical member by designing and changing a light guiding plate to prevent the optical member from being directly attached to a light shielding tape. The light emitted from an LED array is incident to a light guide plate(125). The incident light vertically stands up in the light guide plate and then passes through an optical member(135) and a liquid crystal panel(145). Therefore, a desired image is displayed. A light shielding tape is adhered to an exposed surface of an extended portion(125c) of the light guide plate. A plurality of light-emitting diodes are formed at regular intervals. A metal PCB sets up the light-emitting diode. An inverter supplies the power to the LED array on the rear surfaces of the cover PCB and a cover bottom.

Description

Liquid Crystal Display Device Module

The present invention relates to a liquid crystal display module, and more particularly, to the improvement of image quality and appearance stability in the liquid crystal display module.

In general, the liquid crystal display, which is one of the flat panel display devices, has a better visibility than the cathode ray tube (CRT) and is smaller than the cathode ray tube of the screen size having the same average power consumption. Along with the devices and the field emission display devices, they are recently attracting attention as the next generation display devices for mobile phones, computer monitors, and televisions.

Such LCDs can be classified into small models mounted on mobile phones, DMB terminals, PDAs, and digital cameras, and large models mounted on TVs or monitors. Typically, small models refer to LCDs having 4.3 inches or less. .

The driving principle of the liquid crystal display device is to use optical anisotropy and polarization property of the liquid crystal. The liquid crystal has a long and thin structure, and thus has a directivity in the arrangement of molecules. Can be controlled.

Accordingly, if the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

However, since the liquid crystal display is a light-receiving element that does not emit light by itself, it requires a separate light source, and the light emitted from the backlight unit serving as the light source is incident on the liquid crystal panel and the light transmitted through the arrangement of the liquid crystals. The amount is adjusted to display an image.

Hereinafter, a conventional liquid crystal display device module, particularly a small model, will be described with reference to the accompanying drawings.

1 is an exploded perspective view illustrating a liquid crystal display module according to a conventional example.

As shown in the drawing, the conventional liquid crystal display module 5 is largely positioned on the liquid crystal panel 45, a driving circuit unit (not shown) attached to the liquid crystal panel 45, and a rear surface of the liquid crystal panel 45. The backlight unit 10 may be classified into the backlight unit 10.

The liquid crystal display module 5 includes a cover bottom 15 positioned at a lowermost part, a main supporter 40 having a rectangular frame shape positioned at an upper portion of the cover bottom 15, and a cover bottom 15. At the inner end of the main supporter 40, a reflecting plate 30, a light guide plate 25 formed on the reflective plate 30, a plurality of optical members 35 mounted on the light guide plate 25, and the main supporter 40. An LED array 60 spaced apart from the light guide plate 25, a light shielding tape 50 attached along an upper edge surface of the optical member 35 and the LED array 60, and a liquid crystal panel on the light shielding tape 50. 45 and a top cover 70 surrounding an edge of the liquid crystal panel 45.

The reflector 30 is made of an aluminum material with good reflectance. In this case, the reflector 30 serves to maximize light efficiency by inducing the light scattered from the LED array 60 back into the light guide plate 25.

The optical member 35 has a form in which a plurality of films, such as a prism sheet, a diffusion sheet, a protective sheet, and the like, are sequentially stacked for the purpose of improving light efficiency.

Although not shown in detail in the drawings, the LED array 60 has a method of mounting a plurality of light emitting diodes emitting light on a metal PCB spaced apart at regular intervals. The reflective plate 30, the light guide plate 25, the optical sheet 35, the light blocking tape 50, and the LED array 60 are referred to as a backlight unit 10.

In general, the reflector 30, the light guide plate 25, and the optical member 35 are seated along the inner edge of the main supporter 40, and the main supporter 40, the LED array 60, and the optical member 35 are disposed. The light shielding tape 50 is attached along the upper edge surface of the substrate. The light blocking tape 50 is formed of an adhesive black tape, and serves to shield light incident to a non-display area that does not represent an image and to secure an appearance level.

This will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view schematically illustrating the configuration of FIG. 1, and FIG. 3 is a plan view illustrating the fastening state of FIG. 2, and shows a portion excluding the liquid crystal panel, the top case, and the cover bottom.

As shown in FIG. 2 and FIG. 3, the main supporter 40 is positioned along the edge thereof on the cover bottom (15 of FIG. 1) located at the lowermost part, and the reflector plate is disposed to cover the inner edge of the main supporter 40. 30, FIG. 1, the light guide plate 25, and the optical member 35 are sequentially mounted. The LED array 60 serving as a light source is positioned at one side spaced apart from the light guide plate 25 and the optical member 35 by a predetermined distance.

In general, the light guide plate 25 and the optical member 35 are manufactured in a rectangular shape having the same or similar size. At this time, the reflector (30 in FIG. 1), the light guide plate 25 and the optical member 35 is designed to cover both short sides or long sides of the main supporter 40, for the purpose of preventing appearance and light leakage. The light shielding tape 50 is attached.

In other words, the light blocking tape 50 may shield the light scattered or incident on the optical member 35, the main supporter 40, and the LED array 60 corresponding to the non-display area NAA. 35, the LED array 60 and the main supporter 40 are attached along the upper edge surface.

However, such a small- and medium-sized model causes a problem that wrinkles occur in the optical member 35 due to different thermal expansion coefficients between the light shielding tape 50 and the optical member 35 when subjected to a high temperature and high humidity reliability test and a similar environment. .

This problem is caused by the fact that in the small model, the thickness of each sheet of the optical member 35 is formed very thin, and the thickness of each sheet must be made thinner gradually in accordance with the trend of thinning. have.

In detail, at about room temperature of approximately 25 ° C. and 50% humidity, the force of the light blocking tape 50 to restrain the optical member 35 is overwhelmingly greater than the force of the optical member 35 to expand. The wrinkles do not occur.

However, when subjected to a high temperature and high humidity reliability test conducted in a temperature of 60 ° C. to 70 ° C. and a humidity of 90% and a similar environment, the light shielding tape 50 is compared with the restraining force of catching the optical member 35. A phenomenon in which the expansion force of 35 is increased causes a problem that wrinkles of wavy patterns occur on the surface of the optical member 35.

This wrinkle defect not only acts as a deterrent to appearance, but in severe cases, it causes a great blow to the reliability of the optical member 35, resulting in a deterioration in image quality.

As an alternative to this, in some small models, a method of constructing a plurality of protrusions on the main supporter 40 and attaching the portions with the light shielding tape 50 is attempted in order to prevent the above-described wrinkle defect.

FIG. 4 is a plan view schematically illustrating a liquid crystal display module according to another example of the related art, and description thereof will be omitted.

As illustrated, the first and second protrusions 62 and 64 are formed at both short sides of the main supporter 40, and the light guide plate 25 of FIG. 1 is disposed to correspond to the first and second protrusions 62 and 64. And the optical member 35 are designed. At this time, a method of attaching the light shielding tape 50 to only the portions corresponding to the first and second protrusions 62 and 64 for the purpose of preventing wrinkle failure of the optical member 35 has been attempted.

This method is designed to narrow the width of the light shielding tape 50, and minimizes the area where the light shielding tape 50 and the optical member 35 come into contact with each other even in high temperature and high humidity tests and similar environments. It has the advantage to do it. Therefore, since the adhesive force for restraining the light blocking tape 50 to restrain the optical member 35 becomes small, wrinkles may be prevented from occurring in the optical member 35.

However, the light shielding tape 50 having the above-described structure may completely shield portions corresponding to the first and second protrusions 62 and 64, but parts except for the first and second protrusions 62 and 64. This results in a failure to shield completely, causing a problem of light leaking between the minute gaps of the side portion (F). Such light leakage is the main culprit of deterioration in image quality of small and medium sized liquid crystal display modules.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object thereof is to secure reliability and stability of appearance by designing and changing a light-shielding tape to a structure attached to a light guide plate and a main supporter.

According to an aspect of the present invention, there is provided a liquid crystal display module including a cover bottom, a rectangular frame-shaped main supporter positioned above the cover bottom, a reflection plate on the cover bottom, and a plate shape on the reflection plate. A light guide plate including a vertical portion extending vertically from the horizontal portion to both ends of the horizontal portion, and an extension portion extending from the vertical portion in a direction of a display area for realizing an image from the vertical portion, and fastening to a space between the vertical portion and the extension portion of the light guide plate. An optical member, an LED array positioned on one side of the light guide plate, and a non-display area that does not represent an image along an upper edge surface of the main supporter, the LED array, and an extension of the light guide plate. A light shielding tape, a liquid crystal panel seated on the light shielding tape, and a top cover surrounding an edge of the liquid crystal panel. It includes.

In this case, the optical member is fastened in a sliding manner by a sliding groove corresponding to a space between the horizontal portion of the light guide plate and the overlapping portion of the light guide plate.

The extension portion of the light guide plate is designed to extend in a range in which a part of the optical member overlaps with the non-display area in a planar manner and does not invade the display area.

In addition, the vertical part and the extension part of the light guide plate may be manufactured integrally with the horizontal part of the light guide plate.

The optical member is configured by sequentially stacking a diffusion sheet, a prism sheet, a protective sheet, and the like, and the light shielding tape is an adhesive black tape.

First, in the high temperature and high humidity reliability test and similar environment, the optical member and the light shielding tape can be prevented from directly contacting each other, thereby improving the reliability of the optical member.

Secondly, in the present invention, the light shielding tape is stably attached to the extension part of the light guide plate, thereby preventing light leakage and ensuring external appearance at the same time.

--- Example ---

The present invention is characterized in that it is possible to secure the appearance level at the same time while preventing the wrinkles by changing the structure of the light guide plate to prevent the optical member and the light-shielding tape is attached directly.

Hereinafter, a liquid crystal display module according to the present invention will be described in detail with reference to the accompanying drawings.

5 is an exploded perspective view showing a liquid crystal display module according to the present invention.

As illustrated, the liquid crystal display module 105 according to the present invention includes a liquid crystal panel 145, a driving circuit unit (not shown) mounted on the liquid crystal panel 145, and a rear surface of the liquid crystal panel 145. The backlight unit 110 serves as a light source.

The liquid crystal display module 105 may include a cover bottom 115 positioned at a lowermost portion, a main supporter 140 having a rectangular frame shape positioned at an upper portion of the cover bottom 115, and a reflector plate on the cover bottom 115. 130, a horizontal portion 125a formed in a plate shape on the reflector plate 130, a plurality of vertical portions 125b extending vertically from both ends of the horizontal portion 125a, and the vertical portions 125b. A light guide plate 125 including an extension part 125c extending in a display area direction to implement an image; an optical member 135 coupled to the light guide plate 125 in a sliding manner; and spaced apart from the light guide plate 125. The LED array 160 mounted on one side, the liquid crystal panel 145 on the optical member 135, and a top cover 170 surrounding the edge of the liquid crystal panel 145.

The optical member 135 may be formed in such a manner that a plurality of films, such as a diffusion sheet, a prism sheet, and a protective sheet, are sequentially stacked for the purpose of improving light efficiency. . In this case, the reflective plate 130, the light guide plate 125, the light blocking tape 150, the LED array 160, and the optical member 135 may be referred to as a backlight unit 110.

In this case, the extension part 125c extending from the vertical part 125b of the light guide plate 125 to the display area is positioned above the optical member 135 mounted on the horizontal part 125a of the light guide plate 125. Thus, the optical member 135 and the light blocking tape 150 are not directly attached.

That is, in the present invention, the light blocking tape 150 is stably attached to the exposed surface of the extension 125c of the light guide plate 125. In this case, the light blocking tape 150 is attached to correspond to a non-display area (not shown) that does not represent an image by using an adhesive black tape.

Although not shown in detail in the drawings, the LED array 160 includes a plurality of light emitting diodes (not shown) configured at regular intervals in one direction, a metal PCB (not shown) mounting the plurality of light emitting diodes, and the metal. An inverter (not shown) for supplying power to the LED array 160 from the back of the PCB (not shown) and the cover bottom 115 is included.

The light emitting diode (not shown) may be a white light emitting diode or a cold cathode fluorescent lamp (CCFL) and a hot cathode fluorescent lamp (HCFL) instead of the light emitting diode.

At this time, the light emitted from the LED array 160 is incident on the light guide plate 125, and then passes through the optical member 135 and the liquid crystal panel 145 in a vertical position on the light guide plate 125 to obtain a desired image. Will be displayed.

In order to prevent the optical member 135 and the light blocking tape 150 from being directly attached in the above-described configuration, an extension 125c extending from the vertical portion 125b of the light guide plate 125 to the display area is provided. It is characterized in that it is designed to be located above the optical member 135 seated on the horizontal portion (125a) of the light guide plate (125).

This will be described in detail with reference to the accompanying drawings.

6 is an exploded perspective view illustrating an enlarged portion of FIG. 5, FIG. 7 is a perspective view illustrating the fastening state of FIG. 6, and FIG. 8 is a plan view illustrating the fastening state of FIG. 5. At this time, parts except the liquid crystal panel, the top case, and the cover bottom are shown.

As shown in FIGS. 6, 7, and 8, the main supporter 140 having a rectangular frame shape is positioned on the cover bottom (115 in FIG. 5) positioned at the bottom thereof. On the inner edge of the main supporter 140, a reflecting plate (130 of FIG. 5), a light guide plate 125, and an optical member 135 are sequentially seated, and spaced apart from the optical member 135 and the light guide plate 125. On one side is mounted LED array 160 to serve as a light source.

In this case, the light guide plate 125 includes a horizontal portion 125a formed in a plate shape on the reflective plate 130, a plurality of vertical portions 125b extending vertically from both ends of the horizontal portion 125a, and the vertical portion ( And an extension part 125c configured to extend in parallel with the horizontal part 125a in the display area direction AA for implementing the image in 125b.

At both ends of the light guide plate 125, an extension part 125c extending from the vertical part 125b to be parallel to the horizontal part 125a is positioned, and the horizontal part 125a and the extension part 125c overlap each other. The interspace is provided with an empty space, that is, a sliding groove (SH). The sliding groove SH serves to prevent the flow of the optical member 135 at the source by allowing the optical member 135 to be coupled to the horizontal portion 125a of the light guide plate 125 in a sliding manner.

The light guide plate 125 including the vertical portion 125b, the horizontal portion 125a, and the extension portion 125c may vary depending on the design of the LCD module, but generally corresponds to both ends of the main supporter 140. Therefore, it is designed on the short side or long side facing each other.

At this time, in the present invention, the height H1 of the vertical portion 125b of the light guide plate 125 is designed to be higher than the sum of the height H2 of the horizontal portion 125a and the thickness of the optical member 135. It is done. That is, the exposed surface of the extension part 125c extending from the vertical part 125b is positioned above the optical member 135.

In addition, the LED array 160 is designed to correspond to the height H1 of the vertical portion 125b, and the extension portion 125c of the light guide plate 125, the LED array 160, and the main supporter 140 are provided. It is characterized in that the light-shielding tape 150 is stably attached along the upper surface of the inner edge of the). At this time, the extension portion 125c of the light guide plate 125 is preferably designed to have a smooth plate shape on the surface of the light guide tape 150 to facilitate attachment.

This configuration is unlike the prior art, so the light shielding tape 150 and the optical member 135 are not directly attached, so even when placed in a high temperature and high humidity test and a similar environment, it is possible to simultaneously secure stability and reliability of appearance. Have

The light guide plate 125 according to the present invention has an advantage that it can be easily manufactured in one piece through an injection molding method.

In addition, the extension portion 125c of the light guide plate 125 is designed to prevent the horizontal portion 125a of the light guide plate 125 and the optical member 135 from directly contacting the bar. As described above, the extension part 125c of the light guide plate 125 overlaps the area of the optical member 135 in planar view with the non-display area NAA, and does not invade the display area AA. It is desirable to design extension in.

Therefore, in the present invention, the light shielding tape and the optical member may be directly contacted by changing the design of the light guide plate, so that there is no fear of wrinkle failure, and that the light shielding tape is stably attached to the extension part of the light guide plate. Through this, there is an advantage that can secure the appearance level at the same time.

However, it will be apparent to those skilled in the art that the present invention is not limited to the above embodiments and various modifications and changes can be made without departing from the spirit and spirit of the present invention.

1 is an exploded perspective view showing a liquid crystal display module according to a conventional example.

FIG. 2 is an exploded perspective view enlarging a portion of FIG. 1; FIG.

3 is a plan view showing a fastening state of FIG.

4 is a plan view schematically showing a liquid crystal display module according to another conventional example.

5 is an exploded perspective view showing a liquid crystal display module according to the present invention.

6 is an exploded perspective view illustrating an enlarged portion of FIG. 5;

7 is a perspective view showing a fastening state of FIG.

8 is a plan view showing a fastening state of FIG.

* Explanation of symbols for the main parts of the drawings *

125a: horizontal portion of the light guide plate 125b: vertical portion of the light guide plate

125c: extension part of light guide plate 130: reflector plate

135: optical member 140: main supporter

150: shading tape 160: LED array

SH: Sliding Groove

Claims (6)

A cover bottom; A main frame supporter having a rectangular frame shape positioned above the cover bottom; A reflector on the cover bottom; A light guide plate including a horizontal portion formed in a plate shape on the reflecting plate, a vertical portion extending vertically from both sides of the horizontal portion, and an extension portion extending in a display area direction to implement an image in the vertical portion; An optical member coupled to a space between the vertical portion and the extension portion of the light guide plate; An LED array positioned at one side spaced apart from the light guide plate; A light shielding tape attached to correspond to a non-display area that does not represent an image along upper edge surfaces of the main supporter, the LED array, and the light guide plate; A liquid crystal panel mounted on the light blocking tape; Top cover surrounding the edge of the liquid crystal panel Liquid crystal display module comprising a. The method of claim 1, The optical member is coupled in a sliding manner by a sliding groove corresponding to a space between the horizontal portion of the light guide plate and an overlapping portion of the light guide plate; The method of claim 1, And the extension part of the light guide plate is designed to extend in a range where the optical member and a part of the planar surface overlap the non-display area and do not invade the display area. The method of claim 1, And a vertical portion and an extension portion of the light guide plate are integrally formed with the horizontal portion of the light guide plate. The method of claim 1, The optical member is a liquid crystal display module, characterized in that the diffusion sheet, the prism sheet, the protective sheet, and the like are sequentially stacked. The method of claim 1, And the light blocking tape is an adhesive black tape.

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