KR20000003682A - Method of controlling a brightness of a television screen - Google Patents

Abstract

PURPOSE: A method of controlling a brightness of a television screen is provided to enhance a degree of a distinction of a received text character by controlling the brightness. CONSTITUTION: The method comprises steps of: changing a receiving mode to a tele-text mode so as to display the tele-text information according to a user's selection; determining whether the mode is tele-text mode(S202); detecting a beam current of a display in case that the current mode is the tele-text mode(S203); comparing the detected beam current to a predetermined value(S204); adjusting the beam current to the determined value if the two value are not identical(S205); and stopping a current displayed program or minimizing the ratio of the screen in case that the two value are identical(S206). Thereby, it is possible to distinguish the tele-text information on the screen.

Description

How to adjust screen brightness on TV

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television system having a teletext function, and more particularly, to a method for adjusting a screen brightness of a TV in which the brightness of a received character is increased by controlling screen brightness when receiving teletext.

In general, teletext is a type of information service broadcasting using a television, and is a text broadcasting method in which service information is transmitted by superimposing other signals using a space of a television signal.

The teletext service information refers to a variety of information such as TV program guide information, weather information, entertainment information, sports information, shopping information, and the like, and a video screen displayed on a monitor of a TV by textual and graphic information. And text information such as teletext information can be selectively displayed according to a user's selection.

The teletext is a term that collectively refers to broadcasting text and graphics as part of a video signal of a television.

Video data refers to the transmission of such information based primarily on interactive methods over telephone lines. The television must be equipped with a suitable decoder to receive the transmitted video material and display it on the screen of the television.

Telegraph text and video data are slightly different but generally use the same code decoder.

When the teletext data is decoded by the code decoder in the receiver of the TV, the text and the graphic data are represented by color on the screen instead of the video screen of the general TV.

The characteristics of teletext broadcasting are that each text and graphic information is composed of random pages. For example, entertainment information is on page 20, weather information is on page 30, and TV program guide information is on page 33. It is divided into pages like a book.

In this way, among the pages of teletext data transmitted for each page, the user can select one page containing the information to be obtained. The page thus selected is decoded by the decoder and stored in the storage device so that it can appear on the screen of the TV.

Teletext, which transmits character information and graphic information using a part of the vertical blanking period during TV program broadcasting, is operated in the following manner in each country.

In the UK, it is operated by teletext method such as Ceefax, Oracle, Video text method in Germany, and Antiope method in France.

Hereinafter, a description will be given of a general teletext TV system with reference to the accompanying drawings.

1 is a diagram illustrating a schematic blow configuration of a TV receiving system having a general teletext function.

Teletext-enabled TVs can be broadly divided into TV systems performing general TV functions and teletext units.

The teletext controller 2 transmits / receives encoded text information or graphic information via a telephone line, and the teletext controller 2 outputs the received information through the transmitter / receiver 1 by decoding or the like. And a teletext image processing unit 3 which processes and outputs a teletext image signal output from the teletext control unit 2 so as to be displayed.

Here, the character or figure information may be received as part of the broadcast program using the vertical erasing section of the broadcast program instead of the telephone line.

As such, it is more commercially available to receive teletext information as part of a broadcast program and to display it by a user's selection.

The schematic configuration of a TV system having such a teletext section is as follows.

A TV system controller 4 for controlling the entire TV system and outputting a TV broadcast signal or teletext information on the screen, and a key input unit configured in the TV main body to input a user's selection signal ( 5), a remote controller input unit 6 for remotely inputting a user's selection signal, an OSD unit 7 for outputting an OSD (On Screen Display) signal under the control of the TV system controller 4, and a TV system controller A tuning unit 8 for selectively outputting a broadcast signal according to the tuning control signal of (4), a TV image processing unit 9 for receiving and processing TV image data and OSD data of the tuning unit 8 and outputting the same; And a composite image processing unit 10 for selectively outputting the output signal of the TV image processing unit 9 or the teletext image processing unit 3 under the control of the TV system control unit 4, and through the composite image processing unit 10. Teletext information or TV It is largely composed of the external display section 11 for displaying a call to the outside.

A TV having such a general teletext function is transmitted when a user selects to execute the teletext mode by using an external control signal input means such as a key input unit 5 and a remote control input unit 6 during TV reception. The reception unit 1 selectively displays image information or figure information received through a telephone line or information received as part of a broadcast program on a screen.

At this time, the TV system control unit 4 controls the composite image processing unit 10 to stop the output of the TV image so that the teletext signal is displayed on the external display unit 11.

Such a teletext function enables the user to efficiently use a variety of information desired.

In the conventional TV system having the teletext function, there are the following problems.

There is no function to control the screen brightness required for the display of the TV video signal and the screen brightness required for the display of the teletext information, so that the user is provided with the teletext information mainly composed of characters in a state of reduced sharpness. do.

This is disadvantageous in terms of the system utilization of the teletext function that is becoming popular, and also causes a problem of preventing the efficient acquisition of various information from the user's point of view.

The present invention has been made to solve the problems of the conventional TV system having a teletext function, and provides a method for adjusting the screen brightness of a TV by controlling the screen brightness at the time of receiving teletext data to increase the sharpness of the received text. Its purpose is to.

1 is a schematic structural block diagram of a TV receiving system having a general teletext function;

2 is a flowchart illustrating a method of adjusting screen brightness according to the present invention.

In the method of adjusting the screen brightness of a TV of the present invention, the screen brightness is controlled to increase the sharpness of received text by controlling the screen brightness when receiving teletext data. Switching to teletext mode for display, determining whether the TV system has been switched to teletext mode, and detecting a beam current value associated with the display of the TV system if the TV system has been switched to teletext execution mode. Comparing the detected beam current value with a reference set value which is preset for display of the teletext information; and if the reference set value and the beam current value are not equal, the beam current value is set to the same level as the reference set value. Adjusting, and the current display when the reference set value and the detected beam current value become equal. And displaying the received teletext information in a state in which the program being suspended is stopped or the ratio of occupying the screen is reduced.

Hereinafter, the screen brightness adjusting method of the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a screen brightness adjusting method of the present invention.

In the screen brightness control method of the present invention, a beam current value is detected in the teletext mode, and the screen brightness is controlled using the detected value.

First, a teletext mode is executed to display teletext information received through a part of a broadcast signal or a telephone line by a user's selection.

When the user inputs a control signal for executing the teletext mode by using an external user input means, it is determined whether the TV system is switched to the teletext mode.

Here, if the teletext execution mode has not been switched, the teletext mode execution signal is input again, and if the TV system is switched to the teletext execution mode, the beam current value related to the display of the TV system is detected (203S).

Then, the detected beam current value is compared with a reference set value which is set in advance so as to be suitable for the display of the teletext information.

Here, the reference setting value is appropriately set to be darker than the brightness of displaying the program in the TV system.

According to the development trend of the current TV system, setting the reference value of about 700 Hz is the most suitable setting for commercialization.

If the reference set value and the detected beam current value are the same, the received teletext information is displayed while the currently displayed program is stopped or the ratio of occupying the screen is reduced (206S).

To reduce the aspect ratio, you can use the PIP function.

However, if the reference set value and the beam current value are not the same or smaller or larger, the TV system controller adjusts the beam current value to the same level as the reference set value (204S).

In the level adjusting step of the beam current value, the step of detecting the beam current value and comparing the reference set value may be repeated a predetermined number of times or until it is equal.

Then, the teletext information is displayed when the screen brightness state is most suitable for displaying the teletext information through the level adjustment step of the beam current value.

At this time, the display operation also displays the received teletext information in a state in which the program currently being displayed is stopped or the ratio of occupying the screen is reduced.

The method of adjusting the screen brightness of a TV according to the present invention can maintain the sharpness of teletext character information in an optimal state when switching to a teletext mode while watching a TV program in a very bright state on a general screen.

As such, the beam current value adjusting function may be used through the same steps when a display in a mode other than the normal program display is required in addition to the teletext function.

The reference setting value at this time can be changed or added appropriately according to the needs of the user.

Such a method of adjusting the screen brightness of a TV according to the present invention has the following effects.

First, the screen brightness required for the display of the TV video signal and the screen brightness required for the display of the teletext information can be appropriately adjusted to different levels so that the user can secure the teletext information mainly composed of characters. You will be provided.

Secondly, it is advantageous in terms of system utilization of the popularized teletext function and also enables efficient acquisition of various information from the user's point of view.

Claims (2)

Switching to a teletext mode to display teletext information received through a part of a broadcast signal or a telephone line by a user's selection; Determining whether the TV system has been switched to teletext mode; If the TV system is switched to the teletext execution mode, detecting a beam current value related to the display of the TV system; Comparing the detected beam current value with a reference set value which is previously set to be suitable for the display of the teletext information; Adjusting the beam current value to the same level as the reference set value if the reference set value and the beam current value are not the same; And displaying the received teletext information when the reference setting value and the detected beam current value become the same state, by stopping the program currently being displayed or reducing the ratio of occupying the screen. How to adjust brightness. The method of claim 1, wherein in the step of adjusting the level of the beam current value, the reference set value is set to 700 Hz, and the step of detecting the beam current value and comparing the reference set value is repeated a predetermined number of times or until it becomes equal. How to adjust the screen brightness on your TV.