KR20010045701A - Definition improvement method for television - Google Patents

Abstract

PURPOSE: A method for improving a definition of a TV is provided to enhance an image quality by providing different color temperatures in accordance with the kind of an inputted signal without additional hardware. CONSTITUTION: If a user selects a video signal to be displayed through a remote controller and a local key, a micro computer received the signal outputs a proper control signal to a switching unit and a signal converting and amplifying unit, and displays the video signal to a color picture tube(CPT). If the video signal is a PC signal input, the micro computer sets a color temperature as 6500K for identifying a color and a brightness varying characteristic with a monitor to be displayed on the CPT, and performs a gamma correction of an output of the CPT into an output of the monitor. If the video signal is not a PC signal input, the micro computer sets a color temperature as 9300K for forming a color and a brightness varying characteristic corresponded to a general TV signal, and adjusts in detail as a gamma characteristic. The micro computer sets the color temperature to control the R,G,B gain value of the signal converting and amplifying unit. The gamma characteristic is corrected by changing a value of a gamma characteristic control unit of a signal conversion circuit portion of the signal converting and amplifying unit and a value of a look up table.

Description

How to improve your TV's image quality {DEFINITION IMPROVEMENT METHOD FOR TELEVISION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving TV image quality, and in particular, an output signal of a personal computer (hereinafter referred to as "PC") is displayed on a color picture tube (hereinafter referred to as "PC"). The present invention relates to a method for improving a TV quality by improving image quality by having different color temperatures according to types of input signals without adding a hardware.

1 is a block diagram showing a general TV configuration, as shown in the TV signal input unit 10 for receiving a TV signal from the outside; A PC signal input unit 20 for receiving a PC signal; A switching unit 30 which receives the output signals of the TV signal input unit 10 and the PC signal input unit 20 and selects and outputs them by a control signal; A signal conversion and amplification unit 40 for converting the signal selected by the switching unit 30 into a signal form shown in the Citi 50 by a control signal and then amplifying and outputting the signal; A microcomputer 60 is configured to control the operation of each unit, and the TV signal input unit 10 is controlled by the microcomputer 60. The tuner 12 selects and receives a TV signal through the antenna 11. )Wow; It is composed of a frequency and image processing unit 13 for outputting the TV signal received through the tuner 12 under the control of the microcomputer 60 and outputs the intermediate frequency and image, the operation process according to the prior art It will be described in detail with reference to the accompanying FIG.

When the TV signal input unit 10 receives the TV signal from the outside, the tuner 12 which receives the TV signal through the antenna 11 selects and receives the tuner under the control of the microcomputer 60, and the tuner The frequency and image processing unit 13 that receives the TV signal selected and received through 12 outputs the intermediate frequency and the image.

Accordingly, the switching unit 30 that receives the output signal of the TV signal input unit 10 outputs the signal to the signal conversion and amplification unit 40, and the signal conversion and amplification unit 40 receives the input signal. Under the control of the microcomputer 60, the CFI 50 converts the signal into a form that can be shown, and amplifies it to show the C 50.

In addition, when the PC signal is received through the PC signal input unit 20, the switching unit 30 that receives the output signal of the PC signal input unit 20 outputs the signal to the signal conversion and amplification unit 40. Thus, the signal conversion and amplification unit 40 converts and amplifies the signal form that can be shown in the Citi 50 and is shown in the Citi 50.

In this case, regardless of whether the TV signal is selected and displayed or the PC signal is input and displayed, the signal conversion and amplification unit 40 always has a color temperature of 9300 ° K corresponding to the TV signal condition. In this case, the inverse gamma correction corresponding to the gamma characteristic of the Citi 50 is performed by the broadcast camera of the broadcasting station so that no separate gamma correction is performed.

As described above, although the gamma characteristic and the color temperature setting values of the monitor and the Citi are different from each other, the PC is displayed on the Citi with the color temperature and gamma characteristic corresponding to the TV signal regardless of the type of the input signal. There was a problem in that the image quality of the image displayed when receiving the signal and displayed on the Citi.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and provides a method for improving the image quality of a TV having improved color quality by having different color temperatures according to the type of input signal without adding hardware. There is this.

1 is a block diagram showing the configuration of a typical TV.

2 is a flowchart illustrating a color temperature setting operation of a conventional TV.

Figure 3 is a flow chart showing the color temperature setting and gamma correction operation according to the image quality improvement method of the present invention TV.

FIG. 4 is a table illustrating color temperature and gamma correction setting values according to an input signal in FIG. 3. FIG.

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

10: TV signal input unit 11: antenna

12 tuner 13 frequency and image processing unit

20: PC signal input unit 30: switching unit

40: signal conversion and amplification unit 50: Citi

60: microcomputer

According to an aspect of the present invention, a video signal to be displayed includes a first step of setting a color temperature such that the same color and luminance change as an output of a monitor, gamma correction, and ending are performed. If the image signal to be displayed in the first step is not the PC signal, it is characterized in that the second step of setting the color temperature corresponding to the output of the Citi, as well as gamma correction and termination.

Hereinafter, with reference to the accompanying drawings, the operation and effect of an embodiment of the present invention will be described in detail.

The structure of the TV to which the present invention is applied is configured in the same manner as in FIG. That is, the TV signal input unit 10 for receiving a TV signal from the outside; A PC signal input unit 20 for receiving a PC signal; A switching unit 30 which receives the output signals of the TV signal input unit 10 and the PC signal input unit 20 and selects and outputs them by a control signal; A signal conversion and amplification unit 40 for converting the signal selected by the switching unit 30 into a signal form shown in the Citi 50 by a control signal and then amplifying and outputting the signal; And a tuner for selecting and receiving a TV signal through the antenna 11 under the control of the microcomputer 60. 12; The TV signal received through the tuner 12 is controlled by the microcomputer 60, and the frequency and image processing unit 13 outputs the intermediate frequency and the image processing, the operation process according to the present invention configured as described above It will be described in detail with reference to Figures 3 and 4 attached.

When the user of the TV selects an image signal to be displayed by using a remote controller or a local key, the microcomputer 60 that receives the input outputs an appropriate control signal to the switching unit 30 and the signal conversion and amplifying unit 40. The video signal selected by the user is displayed on the Citi 50.

At this time, the microcomputer 60 sets the color temperature to 6500K as shown in FIG. 4 so that the color and luminance variation characteristics displayed on the CPI are the same as that of the monitor if the image signal selected by the user is a PC signal input. In addition, the output of the Citi 50 is gamma-corrected similarly to the monitor output.

However, if the image signal selected by the user is not a PC signal input, the microcomputer 60 sets the color temperature to 9300K as shown in FIG. In addition, fine-tuning is made with the gamma characteristics for Citi.

Here, the microcomputer 50 controls and sets the gain ratio of the signal conversion and amplification unit 40 to change and set the color temperature.

The gamma characteristic is corrected by appropriately changing a value of a gamma characteristic controller or a look up table of the signal conversion circuit portion of the signal conversion and amplification unit 40.

As described in detail above, in the present invention, if the image signal to be displayed is a PC signal, the color temperature and gamma correction are performed so that the same color and luminance change as the output of the monitor, but the selected image signal is not the PC signal, the CPI output By correcting the color temperature and gamma corresponding to the above, there is an effect of providing an image having an optimal image quality to the user by compensating for the different color temperature and gamma characteristics according to the type of the input image signal input without additional hardware.

Claims (3)

If the video signal to be displayed is a PC signal, setting a color temperature such that the same color and brightness change as the output of the monitor are performed, and performing gamma correction and ending; If the video signal to be displayed in the first step is not the PC signal, the second step of setting the color temperature corresponding to the Citi output, the gamma correction and the termination step. The method of claim 1, wherein the color temperature is set by controlling a signal gain and amplification ratio of an Algi ratio. The method of claim 1, wherein the gamma characteristic is corrected by appropriately changing a value of a gamma characteristic controller or a look up table in a signal conversion circuit of the signal conversion and amplification unit.