KR100698155B1 - Video display device and method for controlling power thereof - Google Patents

Abstract

The present invention relates to an image display apparatus and a power control method thereof capable of reducing power consumption in an image display apparatus by adjusting a user mode of an image. The present invention provides a display unit for displaying an image selected by a user, and adjusting brightness and contrast of the display unit so that the image is output in the image mode selected by the user. An inverter outputted, a memory unit storing the inverter current amount according to the image mode in the form of a look up table, and an inverter current to be output from the inverter with reference to the memory unit according to the input image mode selected by the user It provides a video display device comprising a control unit for outputting an inverter current control signal for controlling. Therefore, according to the present invention, the power consumption of the image display device can be reduced.

Power control

Description

Video display device and method for controlling power

1 is a block diagram illustrating a conventional image display apparatus;

2 is a block diagram illustrating a video display device according to the present invention.

3A to 3C are diagrams for describing an inverter current amount according to an image mode.

4 is a flowchart for explaining a power control method in an image display apparatus according to the present invention.

* Explanation of symbols for main parts of drawings *

10 control unit 20 inverter

30: display unit 40: memory unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power control in an image display apparatus, and more particularly, to an image display apparatus and a power control method thereof capable of reducing power consumption of an image display apparatus by adjusting a user mode of an image.

Broadcasting is a mass media that targets an unspecified number, which is advantageous because it can be compressed like computer data compression because all elements (video, audio, data) are treated digitally.

After color TV broadcasting, stereo sound, remote control device, subtitle broadcasting, data broadcasting, etc. have adopted some digital technologies. In the 90's, computer and network technologies have been spreading more rapidly, so that the broadcasting field can realize high-definition and multifunctional TV. Digital TV was pursued as a video device.

In the case of digital TV (hereinafter, DTV), one program of HDTV level and three or more programs of SDTV level can be transmitted to one channel, and digital signal transmission and processing make it possible to enjoy a much cleaner screen. The ghost phenomenon can be solved on its own, and radio waves reflected by obstacles can be solved on their own.

Looking at the status of domestic broadcasting, after the pilot broadcast in 2000, the metropolitan area is performing the main broadcast in 2002, the metropolitan city is scheduled for 2004, and will complete the conversion of DTV broadcasting by 2010.

Recently, DTV has been implemented using LCD, PDP or OLED (ORGANIC LIGHT EMITTING DIODES) modules in CRT or projection TV. Such LCDs, PDPs, and OLEDs have the advantage of being considerably thinner than CRTs or projection methods.

Among them, the LCD module is largely composed of a panel, a backlight, and a driving chip.

LCD (Liquid Crystal Display) panel literally means a display made of liquid crystal, which cannot emit light by itself. Therefore, the backlight unit is used for this purpose.

Fluorescent lamps are commonly used as backlight units of LCD monitors.

In order to drive the backlight unit of the LCD module, a DC-AC inverter is used. In addition, the driving chip is a driving circuit chip for driving the LCD monitor with a driver IC.

A back light unit is a light receiving device that displays an image by adjusting an amount of light coming from the outside.

In general, a backlight unit used as a light source of a liquid crystal display device is a method of disposing a cylindrical light emitting lamp, and is divided into an edge method and a direct method.

The edge method is that the lamp unit is installed on the side of the light guide plate for guiding the light, the lamp unit is inserted into both ends of the lamp to emit light, the lamp holder to protect the lamp and the outer peripheral surface of the lamp and one side is It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good uniformity of light and a long service life. It is advantageous to thin the liquid crystal display device.

On the other hand, the direct method began to develop mainly as the size of the liquid crystal display device became larger than 20 inches, and arranged a plurality of lamps in a row on the lower surface of the diffusion plate to direct light directly to the front of the liquid crystal panel. will be.

The direct method is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge method.

Fluorescent lamps used in the conventional backlight unit can be largely classified into a cold cathode fluorescent lamp (hereinafter referred to as CCFL) and an external electrode fluorescent lamp (hereinafter referred to as EEFL).

The CCFL installs a cylindrical nickel electrode at both ends of the discharge space inside the glass tube, generates light of high luminance by direct current discharge through the nickel electrode, and attaches a separate capacitor to drive the inverter.

Meanwhile, the EEFL seals the glass tube and installs an outer wall electrode on the outer walls of both ends of the glass tube, and the outer wall electrode forms an electric field in the glass tube by capacitive coupling with the glass tube wall, and generates light by gas discharge. It has the advantage that it can be driven by a single inverter by connecting a plurality of EEFL in parallel with a long life compared to the CCFL.

However, as the size of such an image display device increases, users may feel like a home theater by watching an image on a large screen and may view a minute image, but the power consumption is decisively increased. Various studies are underway to minimize power.

Hereinafter, a conventional image display apparatus will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a conventional image display apparatus.

The image display apparatus according to the related art is composed of a controller 10, an inverter 20, and a display unit 30.

Herein, when the input image data is scaled according to the resolution by a scaler (not shown) and displayed on the display unit 30, the controller 10 selects an input image mode (comfortable image, clear image, and soft image) selected by the user. ) Outputs a brightness control signal to the inverter 20.

The inverter 20 adjusts the brightness and contrast of the display unit 30 according to the control signal from the controller 10 so that the image is output in the input image mode selected by the user. That is, a current is supplied to the display unit 30 so that the brightness and contrast are adjusted so that the input image is output as one of a comfortable image, a clear image, and a soft image.

The display unit 30 displays an image transmitted from the scaler.

However, in the conventional image display device, the brightness and contrast are adjusted in the user menu to express the image mode in various ways. However, the inverter current is always fixed to the maximum when the product is shipped. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an image display apparatus and a power control method thereof, which can reduce power consumption of the image display apparatus by adjusting a user mode of the image. .

In order to achieve the above object, the present invention provides a display unit for displaying an image selected by the user, the brightness and contrast adjustment of the display unit to output the image in the image mode selected by the user, the input An inverter for outputting a different amount of current according to an image mode, a memory unit for storing the inverter current amount according to the image mode in the form of a look up table, and the memory unit according to the input image mode selected by the user. It provides a video display device comprising a control unit for outputting an inverter current control signal for controlling the inverter current to be output from the inverter.

Preferably, the memory unit includes a lookup table configured to vary the inverter output current according to the image mode.

The image mode is preferably composed of a comfortable image, a clear image, and a soft image.

In addition, it is preferable that the lookup table is set such that a soft image is smaller than the sharp image and the inverter current consumption is less in a comfortable image than in the soft image.

In order to achieve the above object, the present invention provides a method of controlling an image display device that outputs different inverter current amounts for each of a plurality of image modes, the method comprising: selecting one of the image modes, and selecting the selected image. Storing the mode; and supplying an inverter current amount corresponding to the selected image mode to the display unit of the image display apparatus when displaying an image on the display unit of the image display apparatus. It provides a power control method of the device.

In this case, if one of the image modes is selected, the display unit may further include displaying the plurality of image modes on the display unit, and displaying power consumption of the displayed image modes.

Therefore, according to the present invention, the power consumption of the image display device can be minimized.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

2 is a block diagram illustrating a video display device according to the present invention.

The image display apparatus according to the present invention includes a control unit 10, an inverter 20, a display unit 30, and a memory unit 40.

Herein, when the input image data is scaled according to the resolution by a scaler (not shown) and displayed on the display unit 30, the controller 10 selects an input image mode (comfortable image, clear image, and soft image) selected by the user. ) Outputs an inverter current control signal for controlling the inverter current to be output from the inverter 20. At this time, the inverter current amount is adjusted with reference to the memory unit 40 according to the input image mode (comfortable image, clear image, and soft image).

The inverter 20 adjusts the brightness and contrast of the display unit 30 according to the control signal from the controller 10 so that the image is output in the input image mode selected by the user. That is, a current is supplied to the display unit 20 so that the brightness and contrast are adjusted so that the input image is output as one of a comfortable image, a clear image, and a soft image. At this time, the current amount is adjusted according to the control signal from the controller 10.

The display unit 30 displays an image transmitted from the scaler.

The memory unit 40 stores the inverter current amount according to the image mode in the form of a look up table.

3A to 3C are diagrams for describing an inverter current amount according to an image mode, FIG. 3A is a view showing inverter current consumption in a clear image, and FIG. 3B is a view showing inverter current consumption in a comfortable image. 3C is a diagram showing the inverter current consumption in a soft image.

Referring to this, it can be seen that the soft current is less than the clear image, and the inverter current consumption of the comfortable image is less than that of the soft image.

Therefore, the basic inverter current amount is maximized to fit a clear image, and in the case of a smooth image, the inverter current amount is lower than that of the soft image, and in the case of a comfortable image, the inverter current amount is lower than that of the soft image.

4 is a flowchart for describing a power control method in an image display apparatus according to the present invention.

In the method for controlling power in the image display apparatus according to the present invention, when the user selects an image mode (S10), the power consumption according to the image mode is guided (S20). In this case, the soft image compared to the clear image indicates that the current consumption of the comfortable image display device is lower than that of the soft image.

Subsequently, the image mode selected by the user is stored (S30), and the image is displayed in the stored image mode (S40). At this time, if the user's selected video mode is a smooth image or a comfortable image, power consumption is reduced compared to a clear image, and in the case of a comfortable image, power consumption is reduced compared to a clear image.

In the image display apparatus and the power control method thereof according to the present invention, the power consumption of the image display apparatus can be reduced according to the user's selection.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (6)

A display unit which displays an image selected by a user; An inverter configured to adjust brightness and contrast of the display unit so that an image is output in the image mode selected by the user, and output power according to the input image mode to adjust power consumption; A memory unit for storing an inverter current amount for adjusting the brightness and contrast according to the image mode in the form of a look up table; And a controller for outputting an inverter current control signal for controlling an inverter current to be output from the inverter with reference to the memory unit according to the input image mode selected by the user. The method of claim 1, And a lookup table in which the inverter output current amount is set differently according to the image mode. The method of claim 2, The image mode comprises a comfortable image, a clear image and a soft image. The method of claim 3, wherein The look-up table is a video display device, characterized in that the soft image compared to the clear image, the inverter current consumption is less consumed in the comfortable image than the soft image. A method of controlling power consumption of an image display apparatus outputting different inverter current amounts for each of a plurality of image modes, Selecting one of the image modes; Storing the selected video mode; When displaying an image on a display unit of the image display device, supplying an inverter current for adjusting brightness and contrast of the display unit to the display unit of the image display device according to the selected image mode. Power control method of display device. The method of claim 5, Selecting one of the image modes, and displaying the plurality of image modes on the display unit and displaying power consumption of the displayed image modes. .

Images