KR20040083592A - Liquid crystal display apparatus - Google Patents

Abstract

PURPOSE: An LCD for photo sensing is provided to obtaining a light source for a light pen by driving a backlight assembly, thereby reducing the complicated work for providing light sources for lamp and power supply separately. CONSTITUTION: An LCD for photo sensing includes a backlight assembly(200) for generating first light in response to power supply from the outside, an LC panel(110) for displaying images by the first light, and a light pen(950). The light pen includes a light projecting part for projecting second light by collecting the first light, and a light transmission line coupled with the backlight assembly and the light projecting part for supplying the first light to the light projecting part.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY APPARATUS}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for efficiently inputting data using light.

TOUCH PANEL is a device that detects the touched position and performs the processing set by the built-in software when a person's hand or an object touches a character or a specific position shown on the screen of the display without using a keyboard. Say.

In general, a liquid crystal display using a touch panel is mainly used a pressure-sensitive resistive touch panel for dividing the screen into equal grids and then using the change in the resistance value corresponding to a specific lattice to detect the contact epithelium.

In the pressure resistive touch panel, when a specific position of the screen is touched by a user's hand or an object, the resistance value of the grating corresponding to the specific position is different from that of other gratings. Accordingly, location information is generated by recognizing that a contact has occurred at the specific location. The pressure resistive touch panel further includes the pressure resistive touch panel in a general liquid crystal display device, and the overall size of the product increases by the size of the pressure resistive touch panel.

As a method of contacting a specific position of the pressure resistive touch panel, a user's hand may be used, but a pen-type input pen is preferably used.

In order to accurately contact a specific position of the touch panel, the input pen has a portion that contacts the touch panel to be thin like a pen. In general, the input pen is provided separately from the touch panel. Therefore, it is easy to lose the input pen due to carelessness of the user.

It is an object of the present invention to provide a liquid crystal display device for efficiently sensing light.

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating the display unit shown in FIG. 1.

3 is a perspective view illustrating the light pen shown in FIG. 1.

4 is a cross-sectional view of the liquid crystal display shown in FIG. 1.

5A and 5B illustrate various embodiments of a method of coupling the display unit and the light pen shown in FIG. 1 in detail.

<Description of the symbols for the main parts of the drawings>

100: liquid crystal display panel unit 110: liquid crystal display panel

120, 130: tape carrier package 140: printed circuit board

200: backlight assembly 300: mold frame

400: top chassis 500: liquid crystal display module

600: rear case 700: front case

900: display unit 950: light pen

951: light output unit 952: optical transmission line

According to an aspect of the present invention, there is provided a liquid crystal display device including: a backlight assembly generating first light in response to a power source provided from the outside, and receiving the first light from the backlight assembly to receive an image; It comprises a liquid crystal display panel and a light pen to display.

The liquid crystal display panel is positioned above the backlight assembly and generates position information indicating a point at which the second light is incident in response to the second light incident in a direction opposite to the first light. The light pen is connected to the backlight assembly and receives the first light to provide the second light to the liquid crystal display panel.

According to the liquid crystal display, the second light may be generated using the first light generated when the backlight assembly and the light pen are connected to drive the backlight assembly. Accordingly, it is not necessary to separately provide a power supply and a lamp for generating the second light, and it is possible to prevent the light pen from being lost.

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

1 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display 1000 according to the present invention displays an image and generates position information of a point at which the light is contacted in response to light input from an outside into a display area where the image is displayed. And a light pen 950 for providing the light to the unit 900 and the display unit 900.

In more detail, the display unit 900 has a light source for emitting the first light therein and displays a specific image using the first light provided from the light source.

One side of the light pen 950 is connected to the display unit 900 to receive the first light from the display unit 900 and to condense the first light to emit the second light.

In operation, the display unit 900 displays a specific image in the display area, and the light pen 950 emits the second light to any particular point in the display area of the display unit 900. . The display unit 900 generates location information of a point where the second light is in contact with the second light, and the embedded software performs a specific process corresponding to the location information.

FIG. 2 is an exploded perspective view illustrating the display unit shown in FIG. 1.

Referring to FIG. 2, the liquid crystal display device 900 according to the present invention includes a liquid crystal display module 500 for displaying the image by generating the first light, and a rear case 600 accommodating the liquid crystal display module 500. And a front case 700 coupled to the rear case 600 so as to face each other.

More specifically, the liquid crystal display module 500 includes a liquid crystal display panel unit 100 for displaying an image using the first light, and a backlight assembly for providing the first light to the liquid crystal display panel unit 100. And a mold frame 300 for accommodating the backlight assembly 100 and the liquid crystal display panel unit 100 and a top chassis 500 facing the mold frame 300 to face each other.

The liquid crystal display panel unit 100 includes a liquid crystal display panel 110 for displaying an image, a plurality of data side and gate side tape carrier packages (TCP) 120 and 130, and an integrated printed circuit board ( 140).

Specifically, the liquid crystal display panel 110 includes a thin film transistor substrate (TFT) 111 for displaying a pixel, a color filter substrate 112 facing the TFT substrate 111, and the TFT substrate. And a liquid crystal layer (not shown) injected between the 111 and the color filter substrate 112.

The TFT substrate 111 is a transparent glass substrate on which a switching element TFT (not shown) is formed in a matrix form. When the second light is incident on the display area, the TFT substrate 111 generates position information on the incident point corresponding to the second light.

The color filter substrate 112 provided to face the TFT substrate 111 is a substrate in which RGB pixels, which are color pixels expressed in a predetermined color by light, are formed by a thin film process.

The plurality of data side TCPs 120 are attached to the source side of the TFT substrate 111, and the plurality of gate side TCPs 130 are attached to the gate side of the TFT substrate 111. The data side and gate side TCPs 130 and 140 apply a driving signal and a timing signal for controlling the driving of the liquid crystal display panel 110 and the timing of driving the liquid crystal display panel 110 to the liquid crystal display panel 110.

One side of the plurality of data side TCPs 120 is attached to the TFT substrate 111, and the other side thereof is attached to the integrated printed circuit board 140 so that the liquid crystal display panel 110 is connected to the integrated printed circuit board 140. Electrically connected with

The plurality of gate side TCPs 130 are attached to the TFT substrate 111 to electrically connect the liquid crystal display panel 110 to the integrated printed circuit board 140.

The integrated printed circuit board 140 coupled with the plurality of data side TCPs 120 receives an electrical signal from the outside and applies the electrical signals to the data side and gate side TCPs 120 and 130.

Below the liquid crystal display panel unit 100, the backlight assembly 200 for providing uniform first light to the liquid crystal display panel 110 and providing the first light to the light pen 950 is provided. It is provided.

The backlight assembly 200 changes the path of the first light to emit the second light while guiding the lamp units 210a and 210b for generating the first light and the first light toward the liquid crystal display panel 110. The light guide plate 220, optical sheets 230 for uniforming the brightness of the second light, and a reflector 240 for reflecting light leaked from the light guide plate 220 back to the light guide plate 220.

Specifically, the lamp unit 210 is disposed on both sidewalls of the light guide plate 220 and surrounds the lamp 211 for generating the first light and a portion of the lamp 211 and exits from the lamp 211. And a lamp reflector 212 reflecting first light toward the light guide plate 220.

The light guide plate 220 emits the second light in which the path of the first light emitted from the lamp units 210a and 210b is changed in the direction of the liquid crystal display panel 110.

The light guide plate 220 and the lamp 211 combine the first light with the light pen 950 to provide the first light to the light pen 950. That is, the light pen 950 may be combined with the light guide plate 220 or the lamp 211 to receive the first light. A method of coupling the light pen 950 with the light guide plate 220 or the lamp 211 will be described in detail with reference to FIGS. 5A and 5B.

The optical sheets 230 are provided between the light guide plate 220 and the liquid crystal display panel 110. The optical sheets 230 provide the liquid crystal display panel 110 with uniform luminance of the second light emitted from the light guide plate 220.

The reflective plate 240 provided below the light guide plate 220 may reflect light leaked from the light guide plate 220 toward the light guide plate 220 to improve light efficiency.

The backlight assembly 200 and the liquid crystal display panel 110 are sequentially received in the mold frame 300, which is a storage container.

The mold frame 300 includes an open bottom surface 310 and sidewalls 320 extending from the bottom surface 310. The reflecting plate 240, the light guide plate 220, the optical sheets 230, and the liquid crystal display panel 110 are sequentially received on the bottom surface 310 of the mold frame 300, and the light guide plate 220 is provided. ) And the lamp units 210a and 210b are accommodated in the space between the side wall 320 and the side wall 320.

The data side and gate side TCPs 120 and 130 connected to the liquid crystal display panel 110 are bent along the outer wall of the mold frame 300, and the integrated printed circuit board 140 is formed on the bottom surface 310 of the bottom surface 310. It rests on the back. The top chassis 400 as a fixing means is provided on the liquid crystal display panel 110.

The top chassis 400 is coupled to the mold frame 300 so as to face each other so that an effective display area of the liquid crystal display panel 110 on which an image is displayed is exposed, thereby coupling the display unit 100 to the mold frame. To 300.

The liquid crystal display module 500 is accommodated in the rear case 600, which is a storage container, and the rear case 600 is coupled to face the front case 700 provided on the top chassis 400 so as to face each other. The liquid crystal display device 900 is completed.

3 is a perspective view illustrating the light pen shown in FIG. 1.

Referring to FIG. 3, the light pen 950 according to the present invention collects the first light provided from the backlight assembly 200 to emit the second light and the backlight assembly 951. And a light transmission line 952 in combination with the light output unit 951 to provide the first light to the light output unit 951.

In more detail, the light output unit 951 is positioned at a first end of the body 51 and the first end of the body to surround one end of the light transmission line 952 and protect the light transmission line 952. Condensing lens 52 for condensing one light to emit the second light.

The body portion 51 has an insertion opening 10 for inserting the light transmission line 952 therein at a first end thereof, and a second end facing the first end of the body portion 51 of the condensing lens 11. It has a light exit opening 11 for exposing a part to the outside. In this case, the optical transmission line 952 is inserted into the body 51 through the insertion hole 10.

The condenser lens 52 is seated on the light exit port 11 side, and focuses the first light transmitted from the light transmission line 952 to pass the second light through the light exit port 11. Exit to the outside. As the condenser lens 52, a convex lens capable of condensing light is generally used.

One end of the optical transmission line 952 is coupled to the light output unit 951, and the other end is coupled to the backlight assembly 200 to receive the first light from the backlight assembly 200. Provided to section 951. An example of the optical transmission line 952 is an optical cable for converting an electrical signal into a light signal and transmitting the optical signal.

The optical cable is a jacket that converts the electrical signal into a light signal, a clad for protecting the core from an external shock, and a jacket covering the core and the clad to prevent external moisture from penetrating. (Jacket) is included. The shim uses an optical fiber made of very thin glass or plastic, and kevlar fiber is used as the clad. The jacket is formed of a PET material to protect the seam and clad.

4 is a cross-sectional view of the liquid crystal display illustrated in FIG. 1. The mold frame 300 and the top chassis 400 may be more clearly illustrated to more clearly show a relationship between the display unit 900 and the light pen 950. ), The rear case 600 and the front case 700 are omitted.

Referring to FIG. 4, the liquid crystal display panel 110 of the display unit 900 includes a TFT substrate 111, a color filter substrate 112 and a TFT substrate 111 coupled to face the TFT substrate 111. ) And the color filter substrate 112 interposed therebetween.

In the TFT substrate 111, TFTs 11, 13, and 14, which are switching elements, are formed in a matrix on a transparent glass substrate.

The TFTs 11, 13, and 14 may emit light from the liquid crystal driving TFT 11 and the light pen 950 to block and apply a signal voltage to the liquid crystal layer 150. The light sensing TFTs 13 and 14 generate position information corresponding to the second light as the incident light enters the 110.

In the liquid crystal driving TFT 11, a contact hole is formed in a portion of the drain side, and the signal voltage is applied to the liquid crystal layer 150 and blocked.

The light sensing TFTs 13 and 14 include a first TFT driving in response to the second light and a second TFT T3 electrically connected to the first TFT T2. The light sensing TFTs 13 and 14 represent positional information of a point where the second light is incident as the second light is incident.

The liquid crystal driving TFTs 11 are located for each pixel, and the light sensing TFTs 11 are generally located at arbitrary pixel intervals.

A protective film is stacked on the TFTs 11, 13, and 14, and a pixel electrode 15 is stacked on the protective film. The pixel electrode 15 is not formed on the light sensing TFTs 13 and 14, and is electrically connected to the liquid crystal driving TFT 11 through the contact hole 12. The pixel electrode 15 is made of indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive material.

The reflective plate 16 for displaying an image is formed on the pixel electrode 15 by reflecting external light provided from the outside of the display unit 900. The reflective plate 16 is incident on the transmission window 17 for transmitting the first light L1 provided from the backlight assembly 200 and in a direction opposite to the traveling direction of the first light L1. 2 has a light sensing opening 18 for transmitting light L2. The light sensing opening 18 is formed in an area corresponding to the first TFT 13 to receive the second light L2 incident through the display area of the color filter substrate 112. To provide. The reflective plate 16 may be formed of a single reflective film made of aluminum-neodymium (AlNd) having a high reflectance or a double reflective film made of aluminum-neodymium (Alnd) and tungsten molybdenum (MoW).

5A and 5B illustrate various embodiments of a method of coupling the display unit and the light pen shown in FIG. 1 in detail.

5A and 5B, a method of coupling the backlight assembly 200 and the light pen 950 of the display unit 900 may include a method of coupling the light pen 950 and the light guide plate 220. There is a method of combining with the light pen 950 and the lamp 211.

As shown in FIG. 5A, the light pen 950 and the light guide plate 220 are coupled to each other by inserting the light transmission line 952 of the light pen 950 into the side surface of the light guide plate 220. The insertion groove 221 is formed.

The light pen 950 inserts one end of the optical transmission line 952 into the insertion groove 221. When the display unit 900 is driven, the first light emitted from the lamp 211 is radiated to the liquid crystal display panel 110 by the light guide plate 220. In this case, the light transmission line 952 coupled to the light guide plate 220 by using the insertion groove 221 transmits the first light to the light condensing unit 951. The light output unit 951 collects the first light provided from the light transmission line 952 and emits the second light.

In FIG. 5A, an insertion groove 221 is formed in the side surface of the light guide plate 220 to stably couple the light guide plate 220 and the light transmission line 952. However, one end of the light transmission line 952 and the The same effect may also occur when disposed to contact the side wall of the light guide plate 220.

Meanwhile, as shown in FIG. 5B, in the method of coupling the light pen 950 and the lamp 211, one end of the lamp 211 is connected to one side of the transmission line 952. When the lamp 211 is driven in response to the power applied from the outside, the light transmission line 952 transmits the first light applied from the lamp 211 to the light output unit 951. In this case, the light transmission line 952 may be connected to a lamp tube of the lamp 211 that generates the light, or may be connected to an electrode of the lamp 211. When connected to an electrode of the lamp 211, the light transmission line 952 generates light in response to an electrical signal applied from the electrode, and provides the light to the light output unit 951.

As described above, since the light pen 950 according to the present invention receives light from the backlight assembly 200, it is not necessary to separately provide a power source for generating light. In addition, the light pen 950 is coupled to the backlight assembly 200 to prevent the light pen 950 from being lost due to user's carelessness and is easy to carry.

As described above, according to the present invention, the light pen may be provided with a light source through driving of the backlight assembly, and may reduce the trouble of separately providing a lamp and a power source for generating light. In addition, since the battery for the lamp and the power supply are not used, it is possible to prevent environmental pollution and to prevent the loss of the light pen.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (8)

A backlight assembly generating first light in response to a power supplied from the outside; Located on the backlight assembly, the first light is supplied to display an image, and generates position information indicating a point at which the second light is incident in response to the second light incident in a direction opposite to the first light. A liquid crystal display panel; And And a light pen connected to the backlight assembly and configured to receive the first light and provide the second light to the liquid crystal display panel. The method of claim 1, wherein the light pen, A light emitting unit for condensing the first light and emitting the second light to an upper surface of the liquid crystal display panel; And And a light transmission line connected between the backlight assembly and the light output part to provide the first light provided from the backlight assembly to the light output part. The method of claim 2, wherein the light output unit, One end of the optical transmission line having an insertion opening for inserting the optical transmission line inward at a first end, and an optical exit port for emitting the second light at a second end opposite to the first end; A body part surrounding the part; And And a condenser lens seated at the light exit port side, for condensing the first light transmitted from the light transmission line to emit the second light. 4. The liquid crystal display device according to claim 3, wherein the condensing lens is a convex lens. The liquid crystal display of claim 2, wherein the optical transmission line is formed of an optical fiber. The method of claim 2, wherein the backlight assembly, A lamp unit receiving power from an outside to generate the first light and having one side coupled to a first end of the light transmission line to provide the first light to the light transmission line; And And a light guide plate positioned below the liquid crystal display panel and configured to change a path of the first light incident from the lamp unit and provide the changed light path to the liquid crystal display panel. The method of claim 2, wherein the backlight assembly, A lamp unit for receiving the power from the outside to generate the first light; And Located below the liquid crystal panel, the path of the first light incident from the lamp unit is changed to be provided to the liquid crystal display panel, and a portion of the liquid crystal display panel is combined with the optical transmission line to transfer the first light to the optical transmission line. Liquid crystal display comprising a light guide plate for providing. The liquid crystal display of claim 7, wherein the light guide plate has an insertion groove formed on one sidewall thereof to insert one end of the light transmission line.