KR20070022433A - Liquid Crystal Display Module - Google Patents

Abstract

A liquid crystal display (LCD) module is disclosed. A liquid crystal display (LCD) module of the present invention comprises: a mold frame for supporting an LCD panel having a screen display area capable of substantially displaying images thereon; A lamp mounted to emit light and mounted on a lamp supported by a mold frame (FPCB (Flexible Printed Circuit Board); A light shielding tape disposed between the LCD panel and the lamp mounting FPCB; And a light shielding tape peeling film disposed between the lamp mounting FPCB and the light shielding tape and having a release layer formed on at least a portion of at least one surface of both surfaces of the lamp mounting FPCB and the light shielding tape. According to the present invention, the lamp mounting FPCB disposed adjacent to the shading tape can be maintained without being lifted up even when the shading tape is lifted from the mold frame by heat and humidity when used in the same high temperature and high humidity reliability test as well as in the same or similar environment. This can prevent the occurrence of defects on the screen named Hot Spots.

LCD Display, LCD Module, Backlight Unit, Shading Tape Peeling, Release Layer, Shading Tape Peeling Film

Description

Liquid Crystal Display Module (LCD)

1 is a perspective view of a mobile phone equipped with an LCD module according to a first embodiment of the present invention;

2 is an exploded perspective view of an LCD module according to a first embodiment of the present invention;

3 is an exploded perspective view of the LCD module of FIG. 2 viewed from a direction different from that of FIG. 2;

4 is an exploded perspective view of a main part of the LCD module of FIG. 2;

5 is a view showing the assembled state of FIG.

6 is an exploded perspective view of a main part of the LCD module according to the second embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

     1: LCD Module 5: Mobile Phone

     7: cell phone body 10: LCD panel

    11: main LCD panel 15: sub LCD panel

    20: backlight unit 21: LED lamp

    23: light guide plate 24: main optical sheet

    25: auxiliary optical sheet 27: FPCB

    30: mold frame 40: lamp mounting FPCB

    50: Curing Tape 51: Parking Light Tape

    55: auxiliary shading tape 60: shading tape peeling film

    61: PET film 63: release layer

    65: double sided adhesive

The present invention relates to a liquid crystal display (LCD) module, and more particularly, to the heat and humidity reliability test of the liquid crystal display (LCD) module, as well as to the heat and the liquid crystal display (LCD) module when used in the same or similar environment. The present invention relates to a liquid crystal display (LCD) module that can prevent a hot spot phenomenon caused by lifting a light shielding tape from a mold frame due to humidity.

Liquid crystal displays (LCDs) use the principle that the liquid crystal (liquid crystal crystal) disperses the molecular arrangement of the liquid crystal when applied with a constant voltage, and prevents light from passing through it. Compared with the CRT of the same screen size with excellent and average power consumption, the heat generation is also small and thin, which makes it easy to flatten. Is emerging as a next-generation display device.

Such liquid crystal display devices are small size liquid crystal display (LCD) modules mounted on mobile phones, digital multimedia broadcasting (DMB) terminals, personal digital assistants (PDAs), digital cameras, etc., and large LCDs used in TVs or monitors, depending on their size. You can name them by module. Here, the small LCD module is mainly defined as referring to 4 inches or less.

A liquid crystal display (LCD) module is connected to a printed circuit board (PCB) or directly to a printed circuit board (PCB) through a tape automated bonding (TAB) package to form a display module. In other words, the LCD module can be said to be modularized by attaching one driving IC to the LCD substrate.

Such liquid crystal display (LCD) modules generally include an LCD panel and a backlight unit. Since the backlight unit is adopted in such a way that the LCD panel does not emit light by itself and adjusts the transmittance of light, it is necessary to project light onto the LCD panel so that a predetermined image is formed on the LCD panel. . The backlight unit directly arranges the light source on one side of the LCD panel to directly illuminate the front of the LCD panel, and arranges a line light source or a point light source on one side or multiple sides of the panel to reflect light rays to the light guide plate and the reflective sheet. And a diffusing edge method. Currently, mobile communication terminals such as mobile phones and devices such as PDAs (Personal Digital Assistants), which are referred to as personal portable terminals, mainly adopt the latter edge method.

The backlight unit includes a light guide plate for condensing light emitted from a lamp, which is a light source, toward the plate surface of the LCD panel, to produce uniform and high brightness light, and a prism sheet, which is a functional film that collects light from the lamp. It has a structure stacked on the mold frame in a top down method.

Looking at the structure of the backlight unit in more detail, the backlight unit includes a lamp for emitting light, a light guide plate for condensing the light emitted from the lamp toward the plate surface of the LCD panel, and disposed on one side of the light guide plate to transfer the light from the light guide plate. The FPCB (Curtain Tape), which is disposed between the optical sheet, the LCD sheet and the LCD panel, prevents light from leaking to a portion outside the display area of the LCD panel, and includes a large scale integration (LSI) for driving. Flexbile Printed Circuit Board). In the case of a small LCD module, the lamp is mainly a light emitting diode (LED) lamp, which is a point light source, and the optical sheet is a prism sheet or a functional film that serves to collect light of the LED lamp.

In addition, the LED lamp is mounted on the lamp mounting FPCB (Flexible Printed Circuit Board) by SMT (Surface Mount Technology). The lamp mounting FPCB is attached to the mold frame using an adhesive to the light incident part of the light guide plate, and a light-shielding tape of double-sided adhesive that blocks light is attached thereto. Such a structure is low in production cost, and after manufacturing the lamp mounting FPCB, the LED lamp only needs to be Surface Mount Technology (SMT), and the thickness of the lamp mounting FPCB can be reduced.

By the way, in the conventional liquid crystal display (LCD) module, when the LCD module is used in the high temperature and high humidity reliability test of the LCD module or in a similar high temperature and high humidity environment, the double-sided adhesive shading tape may be lifted due to heat and humidity. However, if the shading tape is lifted, the lamp mounting FPCB is attached to the shading tape as described above, so the lamp mounting FPCB is also lifted, which causes the light guide plate and the LED to be displaced, which is called a hot spot. There is a problem that a defect phenomenon occurs.

In addition, when the LED lamp is unstable SMT, when the lamp mounting FPCB is lifted together by the lifting of the shading tape, it may lead to cold soldering, which refers to a state in which lead is not settled.

Accordingly, it is an object of the present invention to solve this problem in the prior art, in order to solve the above problems, when the light shielding tape is lifted from the mold frame by heat and humidity when used in the same or similar environment as well as at the high temperature and high humidity reliability test, The lamp-mounted FPCB provides an LCD module that can be held in position without being lifted together to prevent the occurrence of defects on the screen, which is called a hot spot.

The object is, according to the present invention, a mold frame for supporting an LCD panel provided with a screen display area capable of substantially image display (mold frame); A lamp mounted with a lamp for emitting light, the lamp mounting being supported on the mold frame (FPCB) (Flexible Printed Circuit Board); A light shielding tape disposed between the LCD panel and the lamp mounting FPCB; And a light blocking tape peeling film disposed between the lamp mounting FPCB and the light blocking tape and having a release layer formed on at least a portion of at least one surface of both surfaces of the lamp mounting FPCB and the light blocking tape. Is achieved by a liquid crystal display (LCD) module.

Here, the release layer of the light-shielding tape peeling film is preferably formed on the surface in contact with the light-shielding tape.

The light-shielding tape peeling film is preferably laminated on the lamp mounting FPCB by an adhesive.

In addition, the light-shielding tape peeling film may be a polyethylene terephtalate (PET) film.

In addition, the release layer of the light-shielding tape peeling film is preferably made of fluorine resin.

In addition, the lamp mounted on the lamp mounting FPCB may be a light emitting diode (LED) lamp.

The object is, according to the present invention, a mold frame for supporting an LCD panel provided with a screen display area capable of substantially image display (mold frame); A lamp mounted with a lamp for emitting light, the lamp mounting being supported on the mold frame (FPCB) (Flexible Printed Circuit Board); A light shielding tape disposed between the LCD panel and the lamp mounting FPCB; And a release layer provided on at least part of the surface of the lamp-mounted FPCB and the light-shielding tape, which are in contact with each other, is achieved by the liquid crystal display (LCD) module.

Here, the release layer is preferably provided on the surface in contact with the light-shielding tape of the lamp mounting FPCB.

In addition, the release layer is preferably made of a fluororesin.

In addition, the lamp mounted on the lamp mounting FPCB may be a light emitting diode (LED) lamp.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention can be applied to both a small LCD module mounted on a mobile phone, a digital multimedia broadcasting (DMB) terminal, a PDA and a digital camera, and a large LCD module used in a TV or a computer monitor. It will be described by applying to a small LCD module manufactured by.

1 is a perspective view of a mobile phone equipped with an LCD module according to a first embodiment of the present invention, as shown in the LCD module 1 according to the first embodiment of the present invention is mounted on the mobile phone body (7) It is used as a display device of the mobile phone 5.

FIG. 2 is an exploded perspective view of the LCD module according to the first embodiment of the present invention, and FIG. 3 is an exploded perspective view of the LCD module of FIG. 2 viewed from a direction different from that of FIG. 2. As shown in these figures, the LCD module 1 according to the first embodiment of the present invention has a screen display area (not shown) that is capable of displaying an image substantially, and two images are formed in the screen display area. Back-light unit 20 disposed on the LCD panels 11 and 15 and the rear side of each LCD panel 11 and 15 to project light to each LCD panel 11 and 15. And a mold frame 30 supporting the LCD panels 11 and 15 and the backlight unit 20.

First, the LCD panel 10 is disposed on the opposite side of the main LCD panel 11 with the main LCD panel 11 and the backlight unit 20 interposed therebetween and is smaller than the main LCD panel 11. Has 15. The main LCD panel 11 and the sub LCD panel 15 will be described with a mobile phone as an example. The main LCD panel 11 corresponds to the internal LCD panel of the mobile phone, and the sub LCD panel 15 is external to the mobile phone. Corresponds to the LCD panel. Each LCD panel 10 has a screen display area capable of displaying an image substantially. The light blocking tapes 51 and 55 to be described later of the backlight unit 20 serve to block light leakage outside the screen display area. do.

The mold frame 30 serving as a skeleton in the backlight unit 20 supports the LCD panel 10 and the backlight unit 20 and is injection molded from a synthetic resin such as PC (polycarbonate).

On the other hand, the backlight unit 20, which is disposed on the rear side of each LCD panel 11 and 15 and projects light to the main LCD panel 11 and the sub LCD panel 15, respectively, Lamp-mounted FPCB (Flexible Printed Circuit Board), light guide plate (23), main optical sheet (24), auxiliary optical sheet (25), parking light tape (51), auxiliary A light shielding tape 55, an FPCB 27, a flexible printed circuit board, and a light shielding tape peeling film 60 are provided.

Lamp-mounted FPCB (40, Flexible Printed Circuit Board) is equipped with an LED (Light Emitting Diode) lamp (21) emitting light and between the main LCD panel 11 and the mold frame (30) Is placed on. The light guide plate 23 condenses the light emitted from the LED lamp 21 toward the plate surface of each LCD panel 10. The main optical sheet 24 is disposed at one side of the light guide plate 23 to transfer light from the light guide plate 23, and the auxiliary optical sheet 25 is disposed at the other side of the light guide plate 23 to emit light from the light guide plate 23. Transfer. Here, the main optical sheet 24 and the auxiliary optical sheet 25 or the main prism sheet and the auxiliary prism sheet which is a functional film that serves to collect the light of the LED lamp 21, respectively, or are provided with them. In addition, the light shielding tape 50 has two types of parking light tape 51 and the auxiliary light shielding tape 55. The parking light tape 51 is disposed between the lamp mounting FPCB 40 and the main LCD panel 11. The light is shielded from the outside of the display area of the main LCD panel 11 so as not to leak light, and the auxiliary light shielding tape 55 is disposed between the lamp mounting FPCB 40 and the sub LCD panel 15 to support the sub LCD panel 15. Blocks light from leaking outside of the screen display area. The FPCB (27, Flexbile Printed Circuit Board) includes a large scale integration (LSI) for driving. And the light shielding tape peeling film 60 is disposed in contact between the lamp mounting FPCB 40 and the parking light tape 51, at least a portion of the surface of the light shielding tape peeling film 60 in contact with the parking light tape 51. The release layer 63 is formed in this.

4 is an exploded perspective view of a main part of the LCD module of FIG. 2, and FIG. 5 is a view illustrating an assembled state of FIG. 4. As shown in these figures, the light shielding tape peeling film 60 is provided between the lamp mounting FPCB 40 and the parking light tape 51. A release layer 63 made of fluorine resin is formed on the surface of the light shielding tape peeling film 60 that is in contact with the light shielding tape 50. That is, the light-shielding tape peeling film 60 is made of PET film 61 made of polyethylene terephtalate (PET), and then the upper surface thereof is released from fluorine resin. The light-shielding tape peeling film 60 is laminated on the upper surface of the lamp mounting FPCB 40 using the double-sided adhesive 65 as shown in detail in FIG. 4 to be integrated with the lamp mounting FPCB 40. Therefore, the light shielding tape peeling film 60 having the release layer 63 formed thereon is coupled to the upper surface of the lamp mounting FPCB 40 and can be easily peeled off even if the light shielding tape 50 of the double-sided adhesive is contacted thereon. In the present embodiment, the light-shielding tape peeling film 60 is laminated on the upper surface of the lamp mounting FPCB 40 by the double-sided adhesive 65, but may be laminated by heat fusion in some cases.

As described above, in the backlight unit of the conventional liquid crystal display (LCD) module, the upper surface of the lamp mounting FPCB 40 is integrated with the light-shielding tape 50 subjected to the double-sided adhesive treatment, and thus is integrated into the liquid crystal display (LCD). When the module is being used in an environment of high temperature and high humidity conditions, or when the light blocking tape 50 is lifted from the mold frame 30 by heat and humidity during the high temperature and high humidity reliability test for the liquid crystal display (LCD) module, the light blocking tape 50 When the lamp mounting FPCB 40 attached together is lifted up together, the LED lamp 21 is displaced at the light incidence part of the light guide plate 23 and thus a hot spot phenomenon occurs. However, in the present invention, the light shielding tape peeling film 60 having the release layer 63 formed thereon is laminated on the upper surface of the lamp mounting FPCB 40, and the bottom surface of the parking light tape 51 having the adhesive is the light shielding tape peeling film 60. The parking light tape 51 and the lamp mounting FPCB 40 are easily peeled off because the parking light tape 51 is lifted by heat and humidity, so that the lamp mounting FPCB 40 maintains its position. The hot spot phenomenon can be prevented. In addition, in the case of a product in which the LED lamp is unstable SMT, the shading tape 50 is lifted to prevent the phenomenon that the lighting failure occurs due to cold soldering.

By this configuration, the operation of the LCD module according to the first embodiment of the present invention will be described.

First, the lamp mounting FPCB 40 is produced and provided, and the light shielding tape peeling film 60 in which the release layer 63 with the shape adhere | attached on the light shielding tape 50 is produced. The light-shielding tape peeling film 60 is prepared by first producing a PET film 61 using PET as a material and releasing the fluorine resin on the surface of the produced PET film 61.

Thus, the light-shielding tape peeling film 60 in which the release layer 63 was formed is laminated | stacked on the upper surface of the lamp mounting FPCB 40 using the double-sided adhesive 65 etc. After lamination, the lamination is inspected properly, and then inspection is performed on the outer shape of the lamp mounting FPCB 40 and the light shielding tape peeling film 60. Thereafter, the LCD panel 10 or the like is assembled to the mold frame 30 to complete the assembly of the LCD module 1, and then assembled to the portable terminal 5 to be used.

Thereafter, when the LCD module 1 is used at the high temperature and high humidity reliability test as well as when the LCD module 1 is used in the same or similar environment, the parking light tape 51 may be lifted from the mold frame 30 due to heat and humidity. Can be. However, even if the parking light tape 51 is lifted from the mold frame 30, the bottom surface of the parking light tape 51 with the adhesive is in contact with the release layer 63 of the light shielding tape peeling film 60, so the parking light tape 51 ) Is easily peeled off from the shading tape peeling film 60, and thus, the lamp mounting FPCB 40 laminated with the shading tape peeling film 60 is held in the mold frame 30 to maintain a hot spot as in the related art. ) The phenomenon does not occur.

6 is an exploded perspective view of a main part of the LCD module according to the second embodiment of the present invention. Here, only parts different from the first embodiment of the present invention will be described, and for the sake of explanation, the same parts as the first embodiment will be referred to by the same reference numerals.

As shown in the drawing, in the LCD module according to the second embodiment of the present invention, at least the surface of the lamp mounting FPCB 40a, which is in contact with the shading tape 50, is not provided with the shading tape peeling film 60. The release layer 63a is directly provided in some regions. Since the bottom surface of the adhesive parking light tape 51 is in contact with the release layer 63 on the upper surface of the lamp mounting FPCB 40a by this configuration, even if the parking light tape 51 is lifted from the mold frame 30, the parking light is parked. The tape 51 is easily peeled off from the light-shielding tape peeling film 60, and thus, the lamp mounting FPCB 40a having the release layer 63 formed on the upper surface thereof is held in the mold frame 30 to maintain a hot spot as in the prior art. Spot phenomenon does not occur is the same as the first embodiment described above.

In the above-described second embodiment, the release layer 63a is provided on at least a portion of the surface of the lamp mounting FPCB 40a in contact with the parking light tape 51. However, the parking light tape 51 If the parking light tape 51 and the lamp mounting FPCB 40 can be easily peeled off when the light is lifted from the mold frame 30, the surface of the parking light tape 51 that is in contact with the lamp mounting FPCB 40, i.e. The release layer 63 may be provided on at least a portion of the bottom surface of the parking light tape 51.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

As described above, according to the present invention, the lamp mounting FPCB disposed adjacent to the shading tape is not lifted together even when the shading tape is lifted from the mold frame by heat and humidity when used in the high temperature and high humidity reliability test as well as in the same or similar environment. The position can be maintained to prevent the occurrence of defects on the screen, which is called a hot spot.

In addition, in the case of a product in which the LED lamp is unstable SMT, it is possible to prevent the phenomenon that the lighting failure due to the cold shielding tape is lifted up.

Claims (10)

A mold frame for supporting an LCD panel having a screen display area capable of substantially displaying images thereon; A lamp mounted with a lamp for emitting light, the lamp mounting being supported on the mold frame (FPCB) (Flexible Printed Circuit Board); A light shielding tape disposed between the LCD panel and the lamp mounting FPCB; And And a light shielding tape peeling film disposed between the lamp mounting FPCB and the light shielding tape and having a release layer formed on at least a portion of at least one surface of both surfaces of the lamp mounting FPCB and the light shielding tape. Liquid Crystal Display (LCD) Module. The method of claim 1, The release layer of the light-shielding tape peeling film is a liquid crystal display (LCD) module, characterized in that formed on the surface in contact with the light-shielding tape. The method of claim 2, The light-shielding tape peeling film is a liquid crystal display (LCD) module, characterized in that laminated to the lamp mounting FPCB by an adhesive. The method of claim 1, The light-shielding tape peeling film is a liquid crystal display (LCD) module, characterized in that the PET (Polyethyleneterephtalate) film. The method of claim 1, The release layer of the light-shielding tape peeling film is a liquid crystal display (LCD) module, characterized in that made of fluorine resin. The method of claim 1, The lamp mounted to the lamp mounting FPCB is a liquid crystal display (LCD) module, characterized in that the light emitting diode (LED) lamp. A mold frame for supporting an LCD panel having a screen display area capable of substantially displaying images thereon; A lamp mounted with a lamp for emitting light, the lamp mounting being supported on the mold frame (FPCB) (Flexible Printed Circuit Board); A light shielding tape disposed between the LCD panel and the lamp mounting FPCB; And And at least one of the at least one of the lamp mounting FPCB and the light shielding tape, the release layer provided on at least a portion of the surface to be in contact with each other. The method of claim 7, wherein The release layer is a liquid crystal display (LCD) module, characterized in that provided on the surface in contact with the light-shielding tape of the lamp mounting FPCB. The method of claim 7, wherein The release layer is a liquid crystal display (LCD) module, characterized in that made of fluorine resin. The method of claim 7, wherein The lamp mounted to the lamp mounting FPCB is a liquid crystal display (LCD) module, characterized in that the light emitting diode (LED) lamp.

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