KR20060007212A - Display device - Google Patents

Abstract

The present invention relates to a display device, which is attached to a flexible printed circuit board having a plurality of signal lines, a fusible printed circuit board, and includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels, respectively. And a driving integrated circuit unit formed in the first and second display panel units and the first or second display panel unit to drive the first and second display panel units. According to the present invention, by connecting the main display panel portion and the sub display panel portion to one flexible printed circuit board, and directly forming a drive integrated circuit portion for driving them on the display panel portion, while reducing the cost of the display device while simplifying the manufacturing process The size can be further reduced.

Display Device, Drive Integrated Circuit, Flexible Printed Circuit Board, Dual, Display Panel

Description

Display device {DISPLAY DEVICE}

1 is a schematic diagram of a display device according to an exemplary embodiment of the present invention.

2 is a block diagram of a display device according to an exemplary embodiment of the present invention.

3 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

4A to 4D are schematic views of a display device according to another exemplary embodiment of the present invention.

The present invention relates to a display device.

Recently, organic light emitting display (OLED), plasma display panel (PDP), and liquid crystal display (LCD) are substituted for heavy and large cathode ray tube (CRT). Flat panel display devices such as are being actively developed.

PDP is a device that displays characters or images using plasma generated by gas discharge, and OLED displays characters or images by using electroluminescence of specific organic materials or polymers. The liquid crystal display device applies an electric field to a liquid crystal layer interposed between two display panels, and adjusts the intensity of the electric field to adjust a transmittance of light passing through the liquid crystal layer to obtain a desired image.

Among such display devices, especially, so-called dual display devices, each of which is provided with a display panel portion outside and inside, are being actively developed as small and medium sized display devices used in mobile phones and the like.

The dual display device includes a main flexible display circuit board (FPC) having a main display panel unit mounted therein, a sub display panel unit mounted externally, a wiring for transmitting an input signal from the outside, and a main display panel. Auxiliary FPC connecting the part and the sub-display panel, and an integrated chip for controlling them.

The integrated chip generates a control signal and a driving signal for controlling the main display panel and the sub display panel. The integrated chip is mainly mounted on the main display panel in the form of a chip on glass (COG).

At this time, the main display panel needs a so-called blind space for mounting such integrated chip on the bottom and attaching a driving FPC and a blind area for connecting to the auxiliary FPC upward. In addition, a process for mounting an integrated chip and a process for attaching a driving FPC and an auxiliary FPC are required. This requires space for attachment, which increases the size of the overall liquid crystal display, complicates the process, and increases the cost.

Accordingly, an object of the present invention is to provide a display device that can solve the problems of the prior art.

A display device according to an embodiment of the present invention for achieving the technical problem is attached to the flexible printed circuit board having a plurality of signal lines, the soluble printed circuit board, a plurality of gate lines, a plurality of data lines, And first and second display panel portions each including a plurality of pixels, and a driving integrated circuit portion formed on the first or second display panel portion and driving the first and second display panel portions.

The driving integrated circuit unit may be directly formed on the first or second display panel unit together with the gate line, the data line, and the pixel, and may include a gate driving integrated circuit for applying a gate signal to the gate line, and an external device. And a data driver integrated circuit configured to apply a data voltage corresponding to an image signal to the pixel.

The apparatus may further include a signal control integrated circuit controlling the gate driver integrated circuit and the data driver integrated circuit.

The driving integrated circuit unit may include a first driving integrated circuit unit formed in the first display panel unit and a second driving integrated circuit unit formed in the second display panel unit.

The display device may further include a driving IC chip for driving the first or second display panel, and the driving IC chip may be attached to any one of the first display panel, the second display panel, and the soluble printed circuit board. have.

The flexible printed circuit board has an opening, the second display panel portion is exposed through the opening, has a protrusion protruding into the opening, and the second display panel portion is attachable to the protrusion.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

A display device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a schematic view of a display device according to an embodiment of the present invention, FIG. 2 is a block diagram of a display device according to an embodiment of the present invention, and FIG. 3 is a view of a liquid crystal display device according to an embodiment of the present invention. Equivalent circuit diagram for one pixel.

Referring to FIG. 1, a display device according to an exemplary embodiment of the present invention includes two display panel portions of a main display panel 300M and a sub-display panel 300S, a flexible printed circuit film (FPC) 650 attached thereto, and The main display integrated circuit unit 700M and so-called SOG (System on glass) formed in the main display panel unit 300M and the sub display panel unit 300S are respectively included.

The FPC 650 is attached near one side of the main display panel portion 300M, and has an opening 680 and a protrusion 690 protruding into the opening 680, and the sub display panel portion 300S has this protrusion ( 690 and located within opening 680. In this way, the cost can be reduced by not using a separate FPC for attaching the sub display panel 300S.

The FPC 650 includes an input unit 660 under which an external signal is input under the opening 680, and includes a plurality of signal lines for electrical connection between the input unit 660 and the driving integrated circuit units 700M and 700S. (Not shown), these signal lines are generally wide at the point where they are attached to the display panel portions 300M and 300S to form pads (not shown), and input signals to the respective driving integrated circuit portions 700M and 700S. May be separate or shared.

The display panel parts 300M and 300S include display areas 310M and 310S and peripheral areas 320M and 320S that form a screen, respectively, and light blocking layers (not shown) to block light in the peripheral areas 320M and 320S. ("Black matrix") may be provided. The FPC 650 is attached to the light shielding regions 320M and 320S.

Meanwhile, although the driving integrated circuit units 700M and 700S are illustrated in FIG. 1 as being formed in a dotted line, the driving integrated circuit units 700M and 700S are not limited thereto, and the driving integrated circuit units 700M and 700S may be positioned at arbitrary positions of the peripheral areas 320M and 320S. It can be scattered and formed.                     

As shown in FIG. 2, the display panel units 300M and 300S are connected to a plurality of display signal lines G ₁ -G _n and D ₁ -D _m , and are connected to the plurality of display signal lines G ₁ -G _n and D ₁ -D _m , and are arranged in a substantially matrix form. It includes, and includes a driving integrated circuit unit (700M, 700S), respectively.

Most of the pixels Px and the display signal lines G ₁ -G _n and D ₁ -D _m are positioned in the display areas 310M and 310S, and the driving integrated circuit parts 700M and 700S are disposed in the peripheral areas 320M and 320S. Located.

Since the upper panel 200 is smaller than the lower panel 100, a portion of the lower panel 100 is exposed and the data lines D ₁ -D _m extend to the area to be connected to the data driver 500. The gate lines G ₁ -G _n also extend to regions covered by the peripheral regions 320M and 320S to be connected to the gate driver 400.

The display signal lines G ₁ -G _n and D ₁ -D _m are a plurality of gate lines G ₁ -G _n for transmitting a gate signal (also called a “scan signal”) and a data line D for transmitting a data signal. ₁ -D _m ). The gate lines G ₁ -G _n extend substantially in the row direction and are substantially parallel to each other, and the data lines D ₁ -D _m extend substantially in the column direction and are substantially parallel to each other.

Each pixel Px includes a switching element Q connected to the display signal lines G ₁ -G _n and D ₁ -D _m and a pixel circuit connected thereto.

The switching element Q is a three-terminal element whose control terminal and input terminal are connected to the gate line G ₁ -G _n and the data line D ₁ -D _m, respectively, and the output terminal is connected to the pixel circuit. have. The switching element Q is preferably a thin film transistor, and may include polycrystalline silicon or amorphous silicon.

In the case of a liquid crystal display device which is a representative example of a flat panel display device, as illustrated in FIG. 3, the display panel unit 300 includes a lower panel 100, an upper panel 200, and a liquid crystal layer 3 therebetween. The signal lines G ₁ -G _n , D ₁ -D _m and the switching element Q are provided on the lower panel 100. The pixel circuit of the liquid crystal display includes a liquid crystal capacitor C _LC and a storage capacitor C _ST connected in parallel to the switching element Q. The holding capacitor C _ST can be omitted as necessary.

The liquid crystal capacitor C _LC has two terminals, the pixel electrode 190 of the lower panel 100 and the common electrode 270 of the upper panel 200, and the liquid crystal layer 3 between the two electrodes 190 and 270. It functions as a dielectric. The pixel electrode 190 is connected to the switching element Q, and the common electrode 270 is formed on the entire surface of the upper panel 200 and receives a common voltage V _com . Unlike in FIG. 3, the common electrode 270 may be provided in the lower panel 100. In this case, both electrodes 190 and 270 may be linear or rod-shaped.

The storage capacitor C _ST is formed by overlapping a separate signal line (not shown) and the pixel electrode 190 provided on the lower panel 100, and a predetermined voltage such as a common voltage V _com is applied to the separate signal line. Is approved. However, the storage capacitor C _ST may be formed such that the pixel electrode 190 overlaps the front end gate line directly above the insulator.

On the other hand, in order to implement color display, each pixel should be able to display color, which is provided with a color filter 230 of three primary colors, for example, red, green, or blue, in a region corresponding to the pixel electrode 190. It is possible by doing. In FIG. 3, the color filter 230 is formed on the upper panel 200. Alternatively, the color filter 230 may be formed above or below the pixel electrode 190 of the lower panel 100.

Polarizers (not shown) for polarizing light are attached to outer surfaces of at least one of the two display panels 100 and 200 of the display panel unit 300 of the liquid crystal display device.

The driving integrated circuits 700M and 700S include a gate driver 400, a data driver 500, a gray voltage generator 800 connected to the data driver 500, and a signal controller 600 for controlling them. External signals are received through the signal lines provided at 660 and the FPC 650. The driving integrated circuit units 700M and 700S are formed directly on the display panel units 300M and 300S together with the display signal lines G ₁ -G _n , D ₁ -D _m and the switching elements Q, respectively.

The gate driver 400 is connected to the gate lines G ₁ -G _n , and has a gate on voltage V _on for turning _{on the} switching element Q and a gate off voltage for turning off the switching element Q. A gate signal composed of a combination of (V _off ) is applied to the gate lines G ₁ -G _n .

The gray voltage generator 800 generates one or two gray voltages related to the luminance of the pixel. If there are two sets, one of the sets has a positive value for the common voltage (V _com ) and the other set has a negative value.

The data driver 500 is connected to the data lines D ₁ -D _m of the display panel 300 to select the gray voltage from the gray voltage generator 800 and apply the gray voltage to the pixel as a data signal.

The signal controller 600 controls operations of the gate driver 400 and the data driver 500, and may be located only in any one of the display panels 300M and 300S, as necessary.

The display operation of such a display device will now be described in more detail.

The signal controller 600 may control the input image signals R, G, and B and their display from an external graphic controller (not shown), for example, a vertical sync signal V _sync and a horizontal sync signal. (H _sync ), a main clock (MCLK), a data enable signal (DE) is provided. The signal controller 600 generates a gate control signal CONT1 and a data control signal CONT2 based on the input control signal and the input image signals R, G, and B, and generates the image signals R, G, and B. After appropriately processing the display panel 300 according to the operating conditions, the gate control signal CONT1 is sent to the gate driver 400, and the data control signal CONT2 and the processed image signal DAT are transferred to the data driver 500. Export.

The gate control signal (CONT1) is the gate-on scanning start instructing the start of output of a voltage (V _on) signal (STV), a gate-on voltage (V _on) on-voltage gate clock signal (CPV), and a gate for controlling the output timing of the An output enable signal OE or the like that defines the duration of V _on .

The data control signal CONT2 is a load signal LOAD and a data clock signal for applying a corresponding data voltage to the horizontal synchronization start signal STH indicating the start of input of the image data DAT and the data lines D ₁ -D _m . (HCLK). In the case of the liquid crystal display shown in FIG. 3, an inversion that inverts the polarity of the data voltage with respect to the common voltage V _com (hereinafter, referred to as “polarity of the data voltage by reducing the polarity of the data voltage with respect to the common voltage”). Signal RVS may also be included.

The data driver 500 sequentially receives the image data DAT corresponding to one row of pixels according to the data control signal CONT2 from the signal controller 600, and among the gray voltages from the gray voltage generator 800. By selecting the gray scale voltage corresponding to each image data DAT, the image data DAT is converted into a corresponding data voltage and applied to the data lines D ₁ -D _m .

The gate driver 400 applies the gate-on voltage V _on to the gate lines G ₁ -G _n in response to the gate control signal CONT1 from the signal controller 600, thereby applying the gate lines G ₁ -G _n. Turn on the switching element (Q) connected to. The data voltage supplied to the data lines D ₁ -D _m is applied to the corresponding pixel through the turned-on switching element Q.

In the case of the liquid crystal display shown in FIG. 3, the difference between the data voltage applied to the pixel and the common voltage V _com is represented as the charging voltage of the liquid crystal capacitor C _LC , that is, the pixel voltage. The liquid crystal molecules vary in arrangement depending on the magnitude of the pixel voltage. As a result, the polarization of light passing through the liquid crystal layer 3 changes. This change in polarization is represented by a change in transmittance of light by polarizers attached to the display panels 100 and 200.

After one horizontal period (or “1H”) (one period of the horizontal sync signal H _sync , the data enable signal DE, and the gate clock CPV), the data driver 500 and the gate driver 400 are next. The same operation is repeated for the pixels in the row. In this manner, the gate-on voltages V _{on are} sequentially applied to all the gate lines G ₁ -G _n during one frame to apply data voltages to all the pixels. In the case of the liquid crystal display shown in FIG. 3, in particular, when one frame ends, the next frame starts and an inversion signal applied to the data driver 500 such that the polarity of the data voltage applied to each pixel is opposite to the polarity of the previous frame. The state of (RVS) is controlled ("frame inversion"). In this case, the polarity of the data voltage flowing through one data line is changed according to the characteristics of the inversion signal RVS within one frame (eg, "column inversion", "point inversion"), or the voltage of the data voltage applied to one pixel row. The polarities can also be different (eg "row inversion", "point inversion").

Next, a display device according to another exemplary embodiment of the present invention will be described in detail with reference to FIGS. 4A to 4D.

4A to 4D are schematic views of a display device according to another exemplary embodiment of the present invention.

As shown in Figs. 4A to 4D, this display device includes a main display panel portion 300M, a sub display panel portion 300S, an FPC 650, drive integrated circuit portions 700M and 700S, and an integrated circuit chip ( 750).                     

Since the main display panel 300M, the sub display panel 300S, the FPC 650, and the driving integrated circuits 700M and 700S are substantially the same as those shown in FIG. 1, detailed description thereof will be omitted.

The IC chip 750 is driven when the size of the peripheral areas 320M and 320S of the display panel parts 300M and 300S is small so that the driving integrated circuit parts 700M and 700S cannot be integrated in the peripheral areas 320M and 320S. It is a chip made by integrating a part of integrated circuit units 700M and 700S. The IC chip 750 may be attached to an external device (FIG. 4A), attached to the FPC 650 in the form of a chip on film (COF) (FIG. 4B), or in the form of COG, the display panel unit 300M or 300S. ) May be attached (FIGS. 4C, 4D).

According to the present invention, by connecting the main display panel portion and the sub display panel portion to one flexible printed circuit board, and directly forming a drive integrated circuit portion for driving them on the display panel portion, while reducing the cost of the display device while simplifying the manufacturing process The size can be further reduced.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (9)

A flexible printed circuit board having a plurality of signal lines, First and second display panel portions attached to the fusible printed circuit board and including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, respectively; A driving integrated circuit unit formed in the first or second display panel unit and driving the first and second display panel units; Display device comprising a. In claim 1, And the driving integrated circuit unit is directly formed in the first or second display panel together with the gate line, the data line, and the pixel. In claim 2, The driving integrated circuit unit, A gate driving integrated circuit applying a gate signal to the gate line, and A data driving integrated circuit which applies a data voltage corresponding to an image signal from an external source to the pixel Display device comprising a. In claim 3, The driving integrated circuit unit further includes a signal control integrated circuit controlling the gate driving integrated circuit and the data driving integrated circuit. In claim 1, The driving integrated circuit unit A first driving integrated circuit unit formed in the first display panel unit, and A second driving integrated circuit unit formed in the second display panel unit Display device comprising a. In claim 1, And a driving IC chip for driving the first or second display panel portion. In claim 6, And the driver IC chip is attached to any one of the first display panel portion, the second display panel portion, and the flexible printed circuit board. In claim 1, The flexible printed circuit board has an opening, and the second display panel is exposed through the opening. In claim 8, The flexible printed circuit board has a protrusion protruding from the opening, and the second display panel is attached to the protrusion.

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