KR100722032B1 - Method and apparatus for controlling light of an image display device - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling the brightness of an image display device to more effectively control the brightness of the lamp in the trend of increasing the size of the image display device using the lamp.

That is, the present invention is to use a plurality of lamps, and to adjust the brightness more efficiently by driving a plurality of lamps simultaneously or selectively one by one according to the image brightness set by the user, the lamp state, that is, the lamp usage time Not only is it possible to alternately drive automatically, but also to identify the lamp used before the power-off command, so that the lamp can be appropriately selected according to whether a certain time has elapsed after the power-off.

Accordingly, the apparatus and method for controlling brightness of an image display apparatus according to the present invention can simultaneously drive or selectively drive a plurality of lamps according to the brightness set by the user, thereby improving brightness and using a plurality of lamps. Alternate driving is possible depending on the lamp condition, which has the effect of extending the lamp life.

Video display device / lamp / brightness

Description

Method and apparatus for controlling brightness of an image display device {Method and apparatus for controlling light of (an) image display device}

1 is a block diagram schematically illustrating a brightness control apparatus of an image display apparatus according to the related art.

2 is a block diagram showing an apparatus for controlling brightness of an image display device according to the present invention;

3 is a flowchart illustrating a method of controlling brightness of an image display device according to the present invention.

4 is a flowchart illustrating an embodiment of a brightness control method of an image display device according to the present invention;

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

100: user input unit 200: control unit

300: lamp driving unit 400: switching unit

500: first lamp 600: second lamp

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to a brightness control device and method for controlling the brightness of a lamp more effectively in a trend in which the size of the image display device becomes larger in an image display device using a lamp. It is about.

Recently, due to the limitations on the screen size of existing TVs, active development and launch of large-screen, ultra-thin displays has become more prominent, and the development of projection display systems has become more prominent. The spread of projectors and projection imaging devices using display elements such as Liquid Crystal on Silicon (DLP) or Digital Light Processing (DLP) is rapidly increasing.

Here, the liquid crystal display (LCD), which is one of the flat panel display devices, has a better visibility than the cathode ray tube (CRT) and has a smaller average heat dissipation than the CRT having the same screen size. Along with Plasma Display Panel (FED) and Field Emission Display (FED), it has recently been in the spotlight as a next-generation display device such as a monitor of a mobile phone, a computer, or a television.

A projection imaging apparatus using such an LCD as a display element emits a display element having three primary colors of red, green, and blue light and projects an image using a projection lens and a reflector. It refers to an imaging system that magnifies and realizes a final image on a screen.

The LCD displays an image by generating a contrast by injecting a liquid crystal material, which is an intermediate material between a solid and a liquid, between two specially surface-treated thin glass plates and changing the arrangement of liquid crystal molecules by the voltage difference of the electrodes on the upper and lower glass plates. In principle, since the panel on which the text or image is displayed does not emit light by itself, a light source is required to visually recognize the display content.

Hereinafter, a brightness control apparatus of an image display apparatus having a lamp according to the prior art will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a lamp driving apparatus of an image display apparatus according to the prior art.

As shown in FIG. 1, a lamp driving apparatus of an image display apparatus according to the related art includes a lamp 10, a lamp driving unit 20 driving the lamp 10, and the lamp driving unit according to a user's request. And a control unit 30 for outputting a control signal to 20).

The user may set the brightness of the panel (not shown) on the menu, and the controller 30 adjusts the brightness of the image signal by controlling the register value in the image processing according to the brightness set by the user.

That is, the lamp 10 has no brightness control and always shows a constant brightness, and when the state of the lamp 10 is to be determined, the current pulse of the lamp 10 is input to the lamp driver 20. The lamp driver 20 may detect only the state of the lamp 10 by transmitting it to the controller 30.

Therefore, the brightness that can be achieved by one lamp is limited, and the lamp life is shorter than the life of the product, so the lamp must be replaced at regular intervals. In addition, since the brightness of the lamp 10 is inversely proportional to the lifespan, in order to improve the brightness with one lamp, not only the lamp life of the lamp is reduced, but also the width which can vary the brightness with one lamp is quite small to obtain the desired brightness. There was a problem that could not be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to extend the life of the lamp by selectively driving a plurality of lamps according to the brightness set by the user by mounting one or more lamps.

Another object of the present invention is to improve screen brightness by using one or more lamps.

The brightness control apparatus of an image display device according to the present invention for achieving the above object is a plurality of lamps provided as a light source for projecting the image, a lamp driver for driving the plurality of lamps, the user's desired brightness setting, etc. A user input unit for inputting a requirement condition and a driving current from the plurality of lamps are fed back to grasp a lamp state, and the user input unit uses the user input unit to grasp a brightness and a history of use of a lamp before power-on. And a control unit for outputting a control signal for selectively controlling driving, and a switching unit for selectively driving the plurality of lamps according to the control signal of the control unit.
Preferably, the lamp driving unit controls the plurality of lamps to be driven at the same time according to the control signal of the control unit, the plurality of lamps at the same time at the maximum brightness, the simultaneous driving at the lowest brightness, only one of the two driving, respectively, There is a characteristic.
More preferably, the controller is characterized in that it controls the driving sequence of the lamp by grasping which lamp has been used according to whether a predetermined time has elapsed after the power-off.
A brightness control method of an image display device according to the present invention for achieving the above object is a brightness control method of an image display device having a plurality of lamps provided as a light source for projecting the image, to set the screen brightness desired by the user And simultaneously driving the plurality of lamps at the maximum brightness when the screen brightness set by the user is the maximum brightness according to the screen brightness set by the user, and when the screen brightness set by the user is the normal brightness, It comprises a step of grasping the state of each of the three lamps and selectively driving alternately.
Preferably, the step of selectively driving the plurality of lamps includes the step of switching driving according to the driving state of each of the plurality of lamps, determining whether any one of the plurality of lamps has exceeded a preset usage time; When there is a lamp that exceeds the preset usage time, the plurality of lamps are simultaneously driven and at the same time, a lamp that does not exceed the preset usage time is brighter, and a lamp that exceeds the preset usage time is darker. It is characterized by including the step of making.
A brightness control method of an image display apparatus according to the present invention for achieving the above object is a brightness control method of an image display apparatus having a plurality of lamps provided as a light source for projecting an image, whether a predetermined time has elapsed after the power-off Determining whether the predetermined time has elapsed, and if the predetermined time has not elapsed after the power-off, driving a lamp other than the lamp used before the power-off, and the predetermined time after the power-off If it has elapsed, it comprises the step of driving the lamp according to the lamp state regardless of whether previously used or not, there is a feature.

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Hereinafter, an apparatus and method for controlling brightness of an image display device according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an apparatus for controlling brightness of an image display apparatus according to the present invention, FIG. 3 is a flowchart illustrating a method for controlling brightness of an image display apparatus according to the present invention, and FIG. 4 is an image display apparatus according to the present invention. Is a flow chart showing an embodiment according to the brightness control method.

The brightness control apparatus of an image display device according to the present invention is characterized in that a plurality of lamps used as a light source for projecting the image is mounted, such lamps may be mounted as one or more, two, three, etc. Figures 2 to 4 Will be described using two lamps as an example.

As shown in FIG. 2, an apparatus for controlling brightness of an image display apparatus according to the present invention includes first and second lamps 500 and 600 provided as a light source for projecting an image, and first and second lamps ( Lamp driving unit 300 for driving 500 and 600, a user input unit 100 for inputting a requirement such as brightness setting desired by the user, brightness set by the user through the user input unit 100 and the A control unit 200 that detects the states of the first and second lamps 500 and 600 and outputs a control signal to the lamp driver 300, and the first and second units according to the control signal of the control unit 200. The switching unit 400 selectively drives the two lamps 500 and 600.

The operation of the brightness control device of the image display device according to the present invention configured as described above is as follows.

When a user inputs a power-on command through the user input unit 100, the controller 200 outputs a control signal to the lamp driver 100 to drive the first lamp 500 or the second lamp 600. Control as possible.

In addition, the user can set the desired brightness through the user input unit 100, the brightness is set at this time is a bright brightness (maximum brightness), a soft image (normal brightness), a dark image (minimum brightness).

Therefore, the controller 200 outputs a control signal to the switching unit 400 to selectively drive the first lamp 500 and the second lamp 600 according to the brightness set by the user.

That is, when the user selects the maximum brightness, the first and second lamps 500 and 600 are driven. When the normal brightness is selected, any one of the first and second lamps 500 and 600 is selected. Is switched by the switching unit 400 to be selected.

However, the controller 200 receives the current value of the first lamp 500 or the second lamp 600 from the lamp driving unit 100 to grasp the lamp status and automatically turns to the good one when the lamp status is not good. Control to be switched.

That is, when the lifespan of the first lamp 500 is driven more than the set time, the second lamp 600 is switched. If the lifespan of the second lamp 600 is driven more than the set time, the first lamp 500 is switched. It is to switch to the lamp 500. At this time, it should be noted that the usage time of the first lamp 500 and the second lamp 600 should be similarly adjusted.

Therefore, when the life span of the first lamp 500 of the first lamp 500 and the second lamp 600 approaches, the brightness of the second lamp 600 is further improved, and the first lamp 500 ) Can be darker to keep the brightness constant and to prolong the life of the lamp.

On the contrary, when the life of the second lamp 600 is near, the brightness of the first lamp 500 is further improved, and the brightness is kept constant by adjusting the darker of the second lamp 600. The life of the can be extended.

The brightness adjustment method of the image display device according to the present invention configured as described above will be described with reference to FIG. 3. First, a user inputs a power-on command and sets a desired screen brightness (S101 to S102).

Next, it is determined whether the brightness set by the user is a clear image (S103).

As a result of the determination (S103), if the brightness set by the user is a clear image, since the maximum bright image is selected, the first and second lamps are turned on at the same time (S104).

In operation S105, it is determined whether the user has changed the brightness setting.

As a result of the determination (S105), if the user has changed the brightness setting, the process returns to the step (S103) or otherwise keeps a clear image until the user powers off (S106).

In addition, when the determination result (S103), the user has not set a clear image, one of the brightness, such as a soft image, a dark image is selected (S107).

Then, the first lamp is turned on to determine the state of the first lamp (S108 to S109).

It is determined whether the detected start time of the first lamp exceeds a preset lamp life time (S110).

Subsequently, if the start time of the first lamp exceeds a predetermined lamp life time (S110), the controller automatically switches to the second lamp and drives it (S111).

Then, it is determined whether the user has changed the brightness setting (S112).

As a result of the determination (S112), if the user changes the brightness setting, the process returns to step S103, and if not, the second lamp is continuously driven until the user inputs a power-off command (S113).

On the other hand, if it is determined in operation S110 that the start time of the first lamp does not exceed a preset lamp life time, it is determined that the state of the first lamp is better than that of the second lamp. Simultaneously driving the lamp, the second lamp is driven at a low brightness (S114).

As described above, when the user selects a clear image (maximum brightness) in selecting the brightness of the image, the first and second lamps 500 and 600 are simultaneously activated to the maximum, and other than the clear image (maximum brightness). When selecting the brightness of the brightness by adjusting the first lamp 500 and the second lamp 600 selectively.

Therefore, while maintaining the use time of the first lamp 500 and the second lamp 600 similarly, the first lamp 500 and the second lamp 600 to grasp the state of the first The driving time of the lamp 500 and the second lamp 600 should be properly adjusted.

EXAMPLE

The embodiment of the method for controlling the brightness of an image display device according to the present invention focuses on the fact that a lamp mounted on the image display device can be turned on again only after a certain time after power off.

Hereinafter, an embodiment of a brightness control method of an image display device according to the present invention will be described with reference to the accompanying drawings.

According to an embodiment of the brightness control method of the image display device according to the present invention, first, it is determined whether a predetermined time has elapsed after the power-off command (S201).

Subsequently, the determination result (S201), it is determined whether a power-on command is input, although a predetermined time has not elapsed (S202).

 As a result of the determination (S202), if a predetermined time has not elapsed but the power-on command is input, the lamp used before the power-off is checked (S203).

Subsequently, the check result (S203), it is determined whether the first lamp is used before the power off (S204).

As a result of the determination (S204), if the first lamp is used, the second lamp is driven after the power-on command (S205).

If the first lamp is not used, the first lamp is turned on (S206).

Subsequently, a screen is displayed according to the lamp driving (S207).

When the user inputs the power off command, the process ends (S208).

On the other hand, if the user inputs a power-on command after a predetermined time elapses after the power-off command (S201), the lamp used before the power-off is checked (S209 to S210).

In operation S211, it is determined whether the previously used lamp is the first lamp.

As a result of the determination (S211), if the previously used lamp is the first lamp, the state of the first lamp is checked (S212).

If the first lamp can be driven, the first lamp is turned on and a screen is displayed (S213 to S215). In addition, if the first lamp is not driveable, the second lamp is turned on to display a screen.

On the other hand, if the previously used lamp is not the first lamp, the state of the second lamp is checked (S216).

If the second lamp is driven, the second lamp is turned on and a screen is displayed (S217 to S218). In addition, if the second lamp is not driveable, the first lamp is turned on to display a screen.

Therefore, by using the first lamp 500 and the second lamp 600, it is possible to turn on the lamp which has not been used by checking the lamp used before the power-off, and at the same time, selectively drive the lamp according to the lamp state. I would have to.

As described above, the apparatus and method for controlling brightness of an image display device according to the present invention have the following effects.

First, since the plurality of lamps can be driven simultaneously or selectively according to the brightness set by the user, the brightness can be improved.

Second, the lamp life can be extended by using a plurality of lamps and alternate driving according to each lamp state.

Third, since the lamp used before the power off can be checked and driven by the lamp that has not been used, the time until the image is displayed can be shortened.

Fourth, since the brightness can be adjusted in various ways by using a plurality of lamps, the brightness variable width can be increased.

Claims (8)

A plurality of lamps provided as a light source for projecting an image; A lamp driver for driving the plurality of lamps; A user input unit for inputting a requirement such as a brightness setting desired by the user; The control signal for selectively controlling the driving of the lamp by grasping the lamp current by feedback from the plurality of lamps, grasping the lamp status, and grasping the brightness set by the user and the usage history of the lamp before power-on through the user input unit A control unit outputting the lamp driving unit; And, And a switching unit for selectively driving the plurality of lamps according to a control signal of the control unit. The method of claim 1, The lamp driving unit controls the plurality of lamps to be driven simultaneously according to the control state of the lamp, the driving of the plurality of lamps at maximum brightness, the simultaneous driving at the lowest brightness, only one of the two, according to the lamp status Brightness control device of the video display device. The method of claim 1, The controller controls the driving sequence of the lamp by identifying which lamp has been previously used according to whether a predetermined time has elapsed after the power-off. In the brightness control method of an image display device having a plurality of lamps provided as a light source for projecting an image, Setting a screen brightness desired by a user; Simultaneously driving the plurality of lamps at the maximum brightness when the screen brightness set by the user is the maximum brightness according to the screen brightness set by the user; And, And if the screen brightness set by the user is a normal brightness, grasping the state of each of the plurality of lamps and selectively driving them alternately. delete The method of claim 4, wherein Selectively driving the plurality of lamps Switching switching according to the driving state of each of the plurality of lamps; determining whether any one of the plurality of lamps has exceeded a preset usage time; and if there are lamps exceeding the predetermined usage time And simultaneously driving the plurality of lamps, driving the lamps that do not exceed the preset usage time brighter, and driving the lamps that exceed the preset usage time darker. How to control brightness. In the brightness control method of an image display device having a plurality of lamps provided as a light source for projecting an image, Determining whether a predetermined time has elapsed after the power-off; Driving a lamp other than the lamp used before the power-off if the predetermined time has not elapsed after the power-off according to whether the predetermined time has elapsed; And, And driving the lamp according to a lamp state regardless of whether it has been used before or after the predetermined time has elapsed after the power-off. delete

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