KR100349916B1 - Portable display device - Google Patents

Abstract

OBJECTIVE: To provide a portable display device of a folder type that can be displayed externally when a folder cover is covered by using two liquid crystal display devices.

Configuration: In a folder type portable display device including a main body having a key input unit and a lid provided with a liquid crystal display element, one liquid crystal display element is divided into a first display and a second display driven separately. Backlights are attached to opposite surfaces of the first display and the second display so that screen displays of the first and second displays are made in opposite directions.

Effect: Two LCD screens can be implemented with a single LCD, and a regular display unit that can check basic information even after the folder cover is covered in a folder-type mobile phone can be checked at any time without opening a folder. Will be.

Description

Portable display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable display device, and more particularly, to a portable display device that enables information display by a liquid crystal display device even when a folder is folded in a folder type portable display device employing a flat panel display.

A portable display device is a device with a flat panel display that can be easily moved to acquire desired information by wireless communication or to output the stored information. Generally, a portable display device is a general term for electronic devices such as portable telephones, camcorders, PDAs, and notebook computers. do.

The portable display device is basically equipped with a flat panel display for displaying characters, figures, and pictures. The known flat display devices include liquid crystal display (LCD), thin film transistor (TFT) -LCD, and field emission display (FED). ), Plasma display panel (PDP) and electro luminescent (EL) display.

Flat panel display devices have tended to replace CRTs due to their light and small size and flattening, and are widely used because they are suitable for portable devices because they can adopt battery power.

Among the flat panel displays, the most widely used display for portable display devices is liquid crystal display (LCD). The liquid crystal used in the liquid crystal display has a regular molecular arrangement such as crystal of solid with liquidity of liquid, and optical Anisotropy is characterized by the change in molecular arrangement along the direction of the electric field when a voltage is applied. The figure, text, or picture is displayed using the properties of liquid crystals.

Briefly describing the configuration of a liquid crystal display device, a transparent electrode is patterned on upper and lower substrates made of glass or plastic, an insulating layer and an alignment layer are formed, and a sealant is printed between the substrate and the substrate to inject liquid crystal. Polarizers are attached to the outer surface of the upper and lower substrates to provide directionality to incident light, and the driving of the liquid crystal is determined according to whether voltage is applied.

Development of a portable display device using the liquid crystal display device has been considered in various aspects according to its functionality. Recently, a portable phone of a folder type having a small size by folding a liquid crystal display and a function input unit has been preferred.

Folder type portable phones have the advantage of being smaller in size, but they also create another inconvenience when the folder is folded. In other words, every time the user checks basic information such as date and time, the folder must be reopened, and even if a text message is used recently, the folder must be opened and checked. Inconvenience has occurred.

As a solution to solve this problem, even when the folder was folded, another display was released so that basic information could be checked.

The display portion of the portable telephone having a folder type and equipped with a second display on the outside is shown in cross section in FIG. 3, and the opened and folded states of the conventional folder type portable telephone are shown in FIG. .

In FIG. 3, a first display 4 covered by a folder cover is formed on the upper side with the backlight 2 disposed in the center, and a second display 6 is formed on the lower side of the backlight. . The first display 4 is implemented with a screen by the first liquid crystal display 4a and the backlight 2, and the second display 6 is screened by the second liquid crystal display 6a and the backlight 2. This is implemented.

The first display 4 and the second display 6 are respectively formed on the inner side and the outer side of the cover 8 of the folding cellular phone shown in FIG. 4, which covers the seam 10. Is connected to the main body 12 through, the main body 12 is provided with a function input button (14).

When the cover 8 is covered, the second display 6 is driven, and when the cover 8 is unfolded, the first display 4 is driven to allow the user to make a desired transmission or call.

Although not shown, the first display 4 and the second display 6 each have different driving terminals and are formed in a structure capable of displaying different information contents in response to a signal from the central processing unit.

The portable display device having the above-described configuration requires two liquid crystal display elements 4a and 6a to implement the first display 4 and the second display 6. The portable display device has the advantage of using a single backlight 2, but if the manufacturing process is difficult and expensive liquid crystal display elements are mounted on both sides, the production process becomes difficult and the unit cost of the product is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a folder-type portable display device that can display on the outer surface of a cover when only a liquid crystal display device is used.

To this end, the present invention provides a folder-type portable display device including a display unit for displaying information by a liquid crystal display device and a cover for inputting a function, the liquid crystal display device implementing both a first display and a second display simultaneously; And a display unit having a first backlight attached to the first display and a second backlight attached to the second display.

Each of the first display and the second display has a separate driving terminal to display different information.

The first display is folded by the folder cover together with the second backlight and the second display allows the information to be always displayed by battery power even when the folder is folded.

The portable display device having the above-described configuration may implement two displays using one liquid crystal display device, and information recognition may be performed by a second display attached to an outer surface even when the first display of the two displays is folded by a folder cover. It becomes possible.

1 is a schematic cross-sectional view of a portable display device display unit according to the present invention;

2 is a view showing a folded state and an unfolded state of a portable display device according to the present invention;

3 is a side cross-sectional view showing a display unit of a portable display device employing a conventional double-sided LCD.

4 is a view showing a folded state and an unfolded state of the portable display device employing the display unit of FIG.

** Description of symbols for the main parts of the drawing **

5: display interface 8: cover

10: seam 12: main body

14: key 21: first backlight

22: second backlight 40: first display

50: liquid crystal display device 60: second display

EMBODIMENT OF THE INVENTION The structure of this invention is demonstrated in detail with reference to attached drawing. For reference, prior to the description of the present invention will be referred to the same reference numerals as for the parts corresponding to the conventional drawings.

In the portable display device according to the present invention, the display portion is shown in cross section in FIG.

As shown in the drawing, the display unit including one liquid crystal display device 50 has a first backlight 21 and a second backlight 22 on the upper and lower sides of the liquid crystal display device 50 with respect to the boundary surface 5. It is attached separately. The liquid crystal display device 50 is divided into the first display 40 and the second display 60 according to the direction to implement the screen, the first display has the screen brightness by the first backlight 21, The second backlight 22 has the screen luminance by the second backlight 22.

Although not shown, driving terminals are separately formed in the first display 40 and the second display 60, respectively, so that individual driving is possible by receiving a signal from the central processing unit.

The first backlight 21 and the second backlight 22 employ at least one of other backlights including a cold cathode fluorescent lamp, a light emitting diode (LED), and an electroluminescent device (EL).

As shown in the figure, the present invention implements two screens simultaneously with a single liquid crystal and has the same feature that the direction of implementing the screens is reversed. The use of the portable display device having the above characteristics will be described below with reference to the portable telephone illustrated in FIG. 2 as an example.

In the figure, the mobile phone is composed of a cover 8 and the main body 12, a second display 60 is installed on the outer surface of the cover 8, the first display (on the inner surface of the cover 8) 40) is installed. The cover 8 and the main body 12 are connected by a seam 10 and the main body 12 is provided with various function input buttons 14.

When the cover 8 of the portable telephone is open, both the first and second displays 40 and 60 are driven. When the cover 8 is covered, the first display 40 on the inner side of the cover 8 is opened. The driving stops and only the second display 60 is driven.

The basic primary display function is shown in the first display 40 on the inner side of the cover 8. When making a call, when inputting to store information, or when accessing the Internet or the like using a wireless information communication network and acquiring information, the folder cover 8 is opened and a call is made or transmitted.

The second display 60 is a display having a function of displaying basic and simple information, and has a display function that can be implemented as a small screen such as checking a remaining amount of date, time or battery power, or notifying a user of various receptions. It also displays information at all times as long as there is battery power.

The user opens the folder only when making a call or accesses the Internet, and drives the first display, and in the normal state, the user can check basic information while the folder is folded.

Two screens can be realized by a single liquid crystal display device. In the case of a folder-type portable phone, a regular display unit that can check basic information even after a folder cover is mounted is mounted on the outer surface so that information can be checked at any time without opening a folder. .

Claims (2)

A portable display device of a folder type comprising a main body having a key input unit and a lid provided with a liquid crystal display device. One LCD is divided to form a first display and a second display that are driven separately, and the first display and the second display are opposite to each other so that screen displays of the first and second displays are made in opposite directions. A portable display device comprising a configuration in which a backlight including one of a cold cathode tube, a light emitting diode, and an electroluminescent element is attached to a surface. delete