KR20060131015A - 3-dimensional image display device of a mobile handhelds and display methof thereof - Google Patents

Abstract

A method for displaying 3-dimensional images on a mobile device is provided to reduce fatigue of user's eyes by maintaining the brightness of a screen while displaying 2D and 3D images. A mobile device includes a TN(Twisted Nematic) barrier channel, an LCD(Liquid Crystal Display) display, and a back light unit. The driving mode of the LCD display is read from a driver of the LCD display(S10). It is determined whether the display mode is 2D or 3D based on the read result(S20). When the display mode is 3D, the TN barrier channel is turned on, an inverter circuit is activated, and a predetermined maximum driving voltage is applied on the backlight unit(S34). When the display mode is 2D, the TN barrier channel is turned off and the inverter circuit is driven, so that a predetermined minimum driving voltage is applied on the backlight unit(S44).

Description

3-Dimensional image display device of a mobile handhelds and display methof

1 is a schematic exploded cross-sectional view of a stereoscopic image display device of a mobile device applied in the prior art and the present invention;

FIG. 2 is an exploded perspective view of the display device illustrated in FIG. 1 and an explanatory view of light quantity;

3 is a flowchart illustrating a stereoscopic image display method of a mobile device according to the present invention.

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

10: TN barrier panel,

12: transmitted light amount of TN barrier panel,

20: LCD display unit,

22: transmitted light amount of the LCD panel,

30: light distribution unit,

32: Light emission amount of light distribution unit.

The present invention relates to a stereoscopic image display device and a display method of a mobile device, and to a stereoscopic image display device and a display method of a mobile device that can improve the display quality of a stereoscopic image by irradiating a constant amount of display light.

Recently, a technology for a stereoscopic image (three-dimensional image) that can be viewed without wearing glasses in a mobile phone, a notebook, a PDA, etc. has been developed. Such technologies include parallax barrier, lenticular, and holographic methods.

For example, the lenticular method is used for a postcard of a three-dimensional photograph. Recently, cheap 3D cameras with three-eye lenses that can take lenticular stereoscopic images are also on the market, making them easy to enjoy. In addition, the lenticular method is attracting attention as a very small three-dimensional image display method that can enjoy full-color three-dimensional moving images without glasses, and is also used for researches on stereoscopic TV systems, artificial reality, and presence communication for business purposes.

In addition, the parallax barrier system alternately arranges images of two left and right eyes at an appropriate interval behind the opening on the slits and can be separated and viewed when viewed through the opening at a specific point in time.

FIG. 1 is a schematic exploded cross-sectional view of a conventional parallax barrier type stereoscopic display device applied to a mobile device, and FIG. 2 is an exploded perspective view and an explanatory view of a light quantity of the display device shown in FIG. 1. As shown in FIGS. 1 and 2, the display device is largely composed of a TN barrier panel 10, an LCD display unit 20, and a light distribution unit 30.

Light emitted from the light distribution unit 30 sequentially passes through the LCD display unit 20 and the TN barrier panel 10. At this time, the amount of light decreases while passing through the LCD display unit 20, and about 50% of the transmitted light decreases while passing through the TN barrier panel 10.

However, the conventional TN barrier panel type stereoscopic image display device has the following problems. That is, in the parallax barrier method, the slits cover about 50% of the entire screen due to the slits, and light passes through only the remaining 50%.

Therefore, when displaying the 2D image, the thin panel is turned off because the barrier panel is turned off. Therefore, almost all of the light passing through the LCD display portion passes through the barrier panel. This makes the user feel a very bright two-dimensional image.

When the stereoscopic image is displayed, a thin slit appears because the barrier panel is turned on. Therefore, only about 50% of the light transmitted through the LCD display passes through the barrier panel. This makes the user feel a dark stereoscopic image.

As a result, the user may feel that the screen becomes very dark when switching from the 2D image to the stereoscopic image, and in the opposite case, the screen becomes very bright. This difference in brightness increases eye strain, not only distrust of unnatural movements, but also lowers the reliability of the product. Therefore, in recent years, research has been conducted on a technology capable of naturally switching stereoscopic images and two-dimensional images.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to display a stereoscopic image display device of a mobile device which controls the brightness of a display screen to be constant even when displaying a 2D image or displaying a stereoscopic image. And a display method.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments described in conjunction with the accompanying drawings.

In order to solve the above problems of the present invention, an object of the present invention is to provide a mobile device comprising a TN barrier panel 10, an LCD display unit 20 and a light distribution unit 30 to display a stereoscopic image. In the stereoscopic image display method,

Reading a driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20 (S10);

Determining whether the LCD display unit 20 is a 2D image display mode or a 3D image display mode based on a read result (S20);

Turning on the TN barrier panel 10 in the stereoscopic image display mode (S30); And operating an inverter circuit (S32) and applying a predetermined maximum driving voltage to the light distribution unit 30 (S34). And

Turning off the TN barrier panel 10 in the two-dimensional image display mode (S40); And applying a predetermined minimum driving voltage to the light distribution unit 30 by operating the inverter circuit (S32). This may be achieved by a stereoscopic image display method of a mobile device. .

The maximum luminance of the light distribution unit 30 is preferably 150 to 180 candel lines.

In addition, the maximum driving voltage may be more than twice the minimum driving voltage.

In addition, as another category for achieving the object of the present invention, in the display device of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a three-dimensional image,

Reading means for reading the driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20;

Judging means for judging whether the LCD display unit 20 is a two-dimensional image display mode or a stereoscopic image display mode based on the reading result of the reading means;

Driving means for turning on / off the TN barrier panel 10 based on a determination result of the determination means; And

An inverter circuit means for applying the maximum driving voltage or the minimum driving voltage to the light distribution unit 30 based on the determination result of the determining means is also possible 3D image display device of a mobile device.

In addition, the inverter circuit means most preferably applies the maximum driving voltage in the stereoscopic image display mode and applies the minimum driving voltage in the secondary image display mode.

Further, according to another aspect of the present invention, in the table market value of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a three-dimensional image,

Reading means for reading the driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20;

Judging means for judging whether the LCD display unit 20 is a two-dimensional image display mode or a stereoscopic image display mode based on the reading result of the reading means;

Driving means for turning on / off the TN barrier panel 10 based on a determination result of the determination means; And

An inverter circuit means for applying a maximum driving current or a minimum driving current to the light distribution unit 30 based on the determination result of the determining means is possible.

The invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments are shown.

3 is a flowchart illustrating a stereoscopic image display method of a mobile device according to the present invention. As shown in FIG. 3,

In the stereoscopic image display method of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a stereoscopic image,

First, the driving mode of the LCD display unit 20 is read from the driving unit of the LCD display unit 20 (S10). This driving mode may be read from a separate central control unit.

Next, the LCD display unit 20 determines whether the two-dimensional image display mode or the three-dimensional image display mode based on the read result (S20).

If the stereoscopic image display mode, the TN barrier panel 10 is turned on (S30). Then, the (voltage type) inverter circuit is operated (S32) to apply a predetermined maximum driving voltage to the light distribution unit 30 (S34). This is to allow the light distribution unit 30 to irradiate the maximum amount of light (for example: 150 ~ 180 candela). Even though the light distribution unit 30 is irradiated with the maximum amount of light, about 50% of the light is not transmitted through the TN barrier panel 10, so that the amount of light that the user feels with the naked eye is the same as in the 2D image display mode.

The configuration of the inverter circuit is a technique well known to those skilled in the art, and can be easily implemented using an OP amplifier, a transistor, or the like. These inter circuits can be broadly divided into voltage inverter circuits and current inverter circuits, and the actual inverter circuits are a combination of these.

For example, a voltage inverter circuit controls a DC voltage with a converter or a chopper, smooths it with a large capacitor of a DC intermediate circuit, and exchanges the DC voltage with an AC of a required frequency by the inverter.

In addition, the current inverter circuit is a circuit for controlling the DC current in the converter, smoothing it with a large DC reactor in the DC intermediate circuit, and converting the DC current into an AC of a required frequency by the inverter. Such a circuit configuration is a well-known technique familiar to those skilled in the art, so detailed drawings and operation descriptions will be omitted.

If the 2D image display mode is selected, the TN barrier panel 10 is turned OFF. Then, the (voltage type) inverter circuit is operated (S32) to apply the predetermined minimum driving voltage to the light distribution unit 30 (S44). This is to allow the light distribution unit 30 to irradiate the minimum amount of light (or reference amount of light) (for example: 70 to 90 candela). Even though the light distribution unit 30 is irradiated with a minimum amount of light, since the light is transmitted 100% by the TN barrier panel 10, the amount of light that the user feels with the naked eye is the same as in the display mode of the stereoscopic image.

In particular, for this purpose, the maximum driving voltage output from the inverter circuit is more than twice the minimum driving voltage.

Although the present invention uses a voltage inverter circuit, it is possible to replace the current inverter circuit and control the applied current.

In addition, the present invention can be applied not only to mobile devices but also to various display devices such as monitors, TVs, PDPs, and LCD TVs of desktop computers.

Therefore, according to the exemplary embodiment of the present invention as described above, even if the 2D image or the stereoscopic image is displayed, the brightness of the display screen can be controlled to be constant at all times. This reduces eye strain, enables natural scene changes, and improves product reliability.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that all modifications fall within the scope of the appended claims.

Claims (6)

In the stereoscopic image display method of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a stereoscopic image, Reading a driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20 (S10); Determining whether the LCD display unit 20 is a 2D image display mode or a 3D image display mode based on the read result (S20); Turning on the TN barrier panel 10 in the stereoscopic image display mode (S30); And operating an inverter circuit (S32) and applying a predetermined maximum driving voltage to the light distribution unit 30 (S34). And Turning off the TN barrier panel 10 in the two-dimensional image display mode (S40); And (S44) operating the inverter circuit (S32) to apply a predetermined minimum driving voltage to the light distribution unit (30). The method of claim 1, wherein the maximum luminance of the light distribution unit is between 150 and 180 candel lines. The method of claim 1, wherein the maximum driving voltage is more than twice the minimum driving voltage. In the display device of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a stereoscopic image, Reading means for reading a driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20; Judging means for judging whether the LCD display unit 20 is a two-dimensional image display mode or a stereoscopic image display mode based on the reading result of the reading means; Driving means for turning on / off the TN barrier panel 10 based on a determination result of the determination means; And And inverter circuit means for applying a maximum driving voltage or a minimum driving voltage to the light distribution unit (30) based on the determination result of the determining means. 5. The stereoscopic image display device of claim 4, wherein the inverter circuit means applies a maximum driving voltage in the stereoscopic image display mode and applies a minimum driving voltage in the secondary charge image display mode. In the display device of the mobile device composed of the TN barrier panel 10, the LCD display unit 20 and the light distribution unit 30 to display a stereoscopic image, Reading means for reading a driving mode of the LCD display unit 20 from the driving unit of the LCD display unit 20; Judging means for judging whether the LCD display unit 20 is a two-dimensional image display mode or a stereoscopic image display mode based on the reading result of the reading means; Driving means for turning on / off the TN barrier panel 10 based on a determination result of the determination means; And And inverter circuit means for applying a maximum driving current or a minimum driving current to the light distribution unit (30) based on the determination result of the determining means.

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