KR20040076532A - Mobile communication terminal having liquid crystal display device having polarizing filter - Google Patents

Abstract

PURPOSE: A mobile communication terminal having an LCD screen where a polarized filter is mounted is provided to mount a polarized filter for transmitting light in predetermined direction only, in order to transmit outputted contents to a user only, thereby increasing security while guaranteeing privacy. CONSTITUTION: When an interval for inserting the third component thereinto is obtained between an LCD screen(110) and a terminal window(120), a polarizer(130) is comprised on an inner side of the terminal window(120) to transmit light emitted through the LCD screen(110) in vertical direction only to an output surface of the LCD screen(110). If the interval for inserting the third component thereinto is not obtained between the LCD screen(110) and the terminal window(120), the polarizer(130) is comprised on an outer side of the terminal window(120).

Description

Mobile communication terminal having a liquid crystal display equipped with a polarization filter {mobile communication terminal having liquid crystal display device having polarizing filter}

The present invention relates to a mobile communication terminal having a liquid crystal screen for outputting the output data only in the vertical direction of the output surface, and more specifically, the liquid crystal display further comprises a polarizing filter for transmitting light only in a predetermined direction The present invention relates to a mobile communication terminal having a liquid crystal display equipped with a polarization filter configured to view output only when viewed from the front of the screen.

CRT (Cathode Ray Tube), one of the display devices, has been mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but due to the weight and size of the CRT itself, it can not respond to the demand for miniaturization and light weight of electronic products. There was no.

In order to replace the CRT, liquid crystal display devices (LCDs), which have advantages of miniaturization, light weight, and low power consumption, have been actively developed, and recently, they have been able to perform a sufficient role as a flat panel display device. It is developed so much that its demand is gradually increasing.

In particular, the high performance thin film transistor liquid crystal display (TFT-LCD) is characterized in that an amorphous silicon thin film transistor is used as the switching element.

Conventional mobile communication terminals use a liquid crystal display device having the above advantages as a display device, and in particular, a TFT liquid crystal panel having a wide output angle has recently been widely applied.

Hereinafter, a TFT liquid crystal panel applied to a conventional mobile communication terminal will be described with reference to the accompanying drawings.

1 is a cross-sectional view of a TFT liquid crystal panel applied to a conventional mobile communication terminal.

The conventional TFT liquid crystal panel is composed of a color filter substrate as an upper substrate, a thin film transistor substrate as a lower substrate, and a liquid crystal layer formed therebetween.

In more detail, as shown in FIG. 1, the thin film transistor substrate includes a gate wiring (not shown) and a data wiring 14 arranged in a matrix form on the first substrate 1 to define a unit pixel region. Through the thin film transistor formed at the intersection of the two wirings, the thin film transistor, the protective film 15 formed on the front surface including the thin film transistor, and the contact hole 4 formed by removing a predetermined portion of the protective film 15 There is a pixel electrode 8 electrically connected to the thin film transistor.

The thin film transistor includes a gate electrode 11 formed simultaneously with the gate wiring, a semiconductor layer 13 formed on the gate electrode 11, and a source formed simultaneously with the data wiring 14 on the semiconductor layer 13. / Drain electrodes 12a / 12b.

In this case, the pixel electrode may overlap the wiring of the light leaking side for high opening ratio of the device.

In addition, the color filter substrate includes a black matrix 16 formed on the second substrate 2 to prevent light leakage and a high contrast ratio, a color filter layer 17 formed between the black matrix 16, and the color filter layer ( There is an overcoat layer 18 formed flat on the entire surface including 17) and a common electrode 19 formed on the overcoat layer 18.

In addition, the passivation layer 15 initially uses an inorganic silicon nitride layer (SiNx), but the dielectric constant of the silicon nitride layer is high, so that the voltage is applied between the drain electrode 12b and the pixel electrode 8 (part a of FIG. 1). ) And parasitic capacitance occurred between the data wire overlapping the pixel electrode and the pixel electrode 8 (part b of FIG. 1).

Because the drain electrode 12b is formed of a metal such as chromium (Cr), copper (Cu), aluminum (Al), or molybdenum (Mo), and the pixel electrode 8 is an indium thin oxide (ITO) that is a conductive material. Because it is formed.

Currently, in order to solve the above problems, BCB (bezocyclobutene) or acrylic resin, which is an organic material having low dielectric constant, is used as the protective layer.

As a result, the aperture ratio, which was only 60%, reached 70%.

However, the TFT liquid crystal panel having the above structure has a wide output angle, so that the output contents can be seen not only in front of the TFT liquid crystal panel but also in terms of a predetermined inclination angle. Therefore, when using a conventional mobile communication terminal in a crowded place, there is a disadvantage that the privacy of the personal information is violated because the content output on the LCD screen is exposed to other people than the user.

An object of the present invention is to provide a mobile communication terminal having a liquid crystal screen configured to deliver output contents only to a user by mounting a polarization filter that transmits light only in a predetermined direction, to solve the aforementioned problems. There is this.

1 is a cross-sectional view of a TFT liquid crystal panel applied to a conventional mobile communication terminal.

2 is a cross-sectional view of an upper folder of a conventional clamshell mobile communication terminal.

3A is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizing plate is mounted on an inner side surface of a terminal window.

3B is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizer is mounted on an outer surface of a terminal window.

3C is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizing plate is mounted alone on the outside of the LCD screen.

Explanation of symbols on the main parts of the drawings

100: upper folder 110: LCD screen

120: terminal window 130: polarizing plate

A mobile communication terminal having a liquid crystal screen equipped with a polarization filter according to the present invention for achieving the above object, in the mobile communication terminal having a liquid crystal screen for outputting various characters and images, to protect the liquid crystal screen from the outside In order to provide a transparent terminal coupled to the outer surface of the liquid crystal screen at a predetermined interval and a polarizing film coupled to the inner or outer surface of the terminal window.

In addition, when the polarizing film is made of a material having a strength sufficient to protect the LCD screen from external impact, it is also applicable to the method of bonding the polarizing film to the outer surface side of the LCD screen in place of the terminal window.

In addition, the polarizing film applied to the present invention is composed of a structure that transmits light emitted from the LCD screen only to the front of the LCD screen.

In this case, the polarizing plate refers to a filter plate used to convert natural light into polarized light or detect polarized light. Polarizing plates are widely used as filters for camera lenses in addition to polarizers and analyzers such as polarimeters and polarizing microscopes.

In general, a widely used polarizing plate exhibits a distinct polychromatic property, and the herapatite discovered by WR Herapas in 1852 (kininide peroxide) is a needle-like small crystal. ). Taking advantage of the fact that the hepatite has an electric dipole moment, an electric field is applied to a solution in which the crystal is suspended, the crystals are arranged in a predetermined direction, which is then lifted and fixed to a substrate such as celluloid, nylon, or polyvinyl alcohol, or adsorbs the crystal. The film | membrane which made the stretched base material apply | stretch to tension | extension in a fixed direction is made between the glass plates.

Since the polarizing plate applied to the present invention is the same as the polarizing plate currently commercialized, a detailed description of the polarizing plate will be omitted.

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

2 is a cross-sectional view of an upper folder of a conventional clamshell mobile communication terminal.

As shown in FIG. 2, in the conventional clamshell mobile communication terminal, the LCD screen 110 is coupled to the inside of the upper folder 100 so as to have an output direction in an inner surface direction of the upper folder 100, and the liquid crystal screen 110 is connected to the upper folder 100. The terminal window 120 is coupled to the outside of the LCD screen 110 while maintaining a predetermined interval.

The terminal window 120 has a strength of a predetermined standard or more so as to protect the LCD screen 110 from external shocks, and is formed of a transparent material so that contents output through the LCD screen 110 can be transmitted to the outside. In addition, the terminal window 120 is spaced apart from the outer surface of the liquid crystal display 110 so that the terminal window 120 is not bent when the terminal window 120 is bent due to external pressure. Combined.

When the conventional mobile communication terminal illustrated in FIG. 2 is used, when the light emitted through the LCD screen 110 passes through the terminal window 120, the left and right sides as well as the direction perpendicular to the output surface of the LCD screen 110 are left and right. Since it also penetrates to the side, the content output through the liquid crystal display 110 is exposed not only to the user but also to others.

3A is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizing plate is mounted on an inner side surface of a terminal window.

As shown in FIG. 3A, when a gap is secured enough to allow a third component to be inserted between the LCD screen 110 and the terminal window 120, light emitted through the LCD screen 110 may be emitted. The polarizing plate 130 which transmits only in a direction perpendicular to the output surface of the 110 is provided on the inner surface of the terminal window 120.

Since the light emitted through the LCD screen 110 is transmitted only to the front of the LCD screen 110 by the polarizing plate 130, a person other than the user who views the LCD screen 110 in front of the LCD screen 110 You will not see the output.

In addition, the polarizing plate 130 coupled to the structure as shown in Figure 3a has the advantage of being less likely to be damaged because it is protected from the external impact by the terminal window (120).

3B is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizer is mounted on an outer surface of a terminal window.

As shown in FIG. 3B, when the gap enough to insert the third component between the LCD screen 110 and the terminal window 120 is not secured, light emitted through the LCD screen 110 may be emitted. The polarizing plate 130 that transmits only in a direction perpendicular to the output surface of the screen 110 is provided on the outer surface of the terminal window 120.

After the light emitted through the LCD screen 110 passes through the terminal window 120, the light emission direction is adjusted so that the light passes through the polarizing plate 130 and proceeds only in a direction perpendicular to the output surface of the LCD screen 110.

Even though the polarizing plate 130 is provided on the outer side of the terminal window 120, the light emitted through the liquid crystal display 110 passes through the polarizing plate 130, so that the polarizing plate 130 is coupled to the inner side of the terminal window 120. The same effect as that of the case can be obtained.

3C is a cross-sectional view of a mobile communication terminal according to the present invention in which a polarizing plate is mounted alone on the outside of the LCD screen.

3A and 3B, when both the terminal window 120 and the polarizing plate 130 are coupled to the outer surface of the LCD screen 110, the number of parts increases, so that the manufacturing process is complicated and the unit cost is high. have.

In this case, if the polarizing plate 130 is manufactured to have a strength sufficient to protect the LCD screen 110 from external impact, as shown in FIG. 3C, only the polarizing plate 130 is disposed on the outer surface of the LCD screen 110. By mounting alone, the number of parts can be reduced.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. Although the embodiment has been described using a cellular phone as an example, the present invention can also be applied to flip-type or bar-type mobile phones, various mobile communication terminals, PDAs and the like. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

When using a mobile communication terminal having a liquid crystal screen equipped with a polarization filter according to the present invention, the output content is exposed only to the user looking at the front of the liquid crystal screen can increase the security of the content output through the liquid crystal screen It has the advantage of ensuring personal privacy.

Claims (4)

In the mobile communication terminal having a liquid crystal display for outputting various characters and images, And a transparent terminal window coupled to the outer surface of the LCD screen at a predetermined interval, and a polarizing film for transmitting light emitted from the LCD screen only to the front of the LCD screen. The method of claim 1, The polarizing film, Mobile communication terminal, characterized in that coupled to the inner surface of the terminal window. The method of claim 1, The polarizing film, Mobile communication terminal, characterized in that coupled to the outer surface of the terminal window. In the mobile communication terminal having a liquid crystal display for outputting various characters and images, It is made of a material having a strength of a size that can protect the LCD screen from an external impact, and further comprising a polarizing film on the outer surface of the LCD screen to transmit the light emitted from the LCD screen only to the front of the LCD screen Mobile communication terminal, characterized in that.