KR20050078059A - Video dispaly apparatus and method for controlling gamma data thereof - Google Patents

Abstract

An image display apparatus and a method for adjusting gamma data thereof, which are suitable for a general user to adjust an image quality of an image signal output from an image display apparatus according to a user's convenience, and perform a tuning function of tuning the transmitted signal. A tuner board that receives a user's request command including a gamma adjustment command and transmits it to a digital board. A digital board that transmits the gamma adjustment data selected by the user to a drive board together with an image signal transmitted from the tuner board. It includes a driving board that adjusts and outputs the gamma curve of the image signal transmitted by the transmitted gamma adjustment data or the preset gamma adjustment data, so that the black level or the white level can be emphasized according to the user's taste. Characteristics can be satisfied.

Description

Video display device and method for controlling gamma data thereof

The present invention relates to an image display apparatus, and more particularly, to an image display apparatus and a method for adjusting gamma data thereof, which are suitable for a general user to adjust the image quality of an image signal output from the image display apparatus according to a user's convenience.

In general, since the linearity between the source of the input video signal and the output signal through the video display device (for example, plasma display panel (PDP) or liquid crystal display (LCD)) on which the input video signal is displayed does not match, In the PDP TV itself, gamma adjustment is performed to correct the linearity of the video signal.

Here, the gamma adjustment is to emphasize the black level or the white level of the image quality according to the user's taste by selecting a gamma correction value for setting the image quality desired by the general user according to the type of the image or the time of watching TV.

This changes the TV output to apply a gamma curve that improves sharpness, including contrast, and linearity, to bright signals when the picture is generally bright. In many cases, gamma curves need to be converted to apply gamma curves that can improve the gradation, sharpness, and linearity of dark signals.

For example, gamma commonly used in LCD projectors uses a 2.2 or 2.5 gamma curve (γ-curve). At this time, the gamma value was calculated by using the relationship of OSD (On Screen Display) output = maximum brightness * (X / 16) ^Gamma and adjusted automatically or manually. Where X is 8 bits from 1 to 256. In general, the value of X was determined according to the OSD output on the production line.

Here, 2.2 and 2.5 gamma data have advantages and disadvantages, respectively, and 2.2 gamma has an excellent effect of emphasizing white level and 2.5 gamma emphasizing black level. In this case, a gamma correction device that is commonly used to perform gamma correction according to a predetermined gamma curve (γ-curve).

Hereinafter, a method of storing and loading gamma data of a digital TV according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating an internal configuration of a digital TV for explaining a method of storing and loading gamma data in a digital TV according to the related art.

As shown in FIG. 1, an internal configuration of a digital TV for explaining a gamma data storage and load method according to the related art includes a tuner board 30 that performs a tuning function for tuning a transmitted signal, and a digital TV. A digital board 20 which controls the entire integrated circuit IC and transmits an image signal received from the tuner board 30 to the driving board 10, and the main microcomputer 21 of the digital board 20 (VDP: The video display processor includes a driving board 10 that receives an image signal and adjusts and outputs gamma data according to characteristics of a display module (LCD or PDP) which is a final output device.

The driving board 10 may include an erasable programmable ROM (EPROM) 13 that stores preset gamma data and gamma data for correcting an image signal received from the digital board 20. And a video signal received from the digital board 20 in accordance with the gamma data transmitted from the sub-microcom 11 for the driving board, which reads the data from the EPROM 13 to the image processor 15. And an image processor 15 for correcting and outputting linearity between signals.

In addition, the tuner board 30 operates as a standby power source, and plays a role of turning on the TV by taking on a power-on sequence when the digital TV is powered on. The sub micom 31 in the tuner board 30 controls the overall operation of the tuner board 30 and transmits a signal from the outside to the main micom 21 of the digital board 20.

Such gamma data storage and load in the digital TV according to the prior art are stored in the EPROM 13 of the drive board 10 when the automatic gamma adjustment is performed after total assembly in a production line. The video signal received by the digital TV is gamma corrected by a process of the sub-microcom 11 of the driving board 10 reading gamma data from the EPROM 13 and writing gamma data to the image processor 15 at power on. And output.

In other words, the gamma-corrected output value is automatically or manually adjusted according to the relation of OSD (On Screen Display) output = maximum brightness * (X / 16) ^Gamma .

Such gamma data cannot be changed except for TV engineers. In the past, the gamma curve was adjusted by automatic adjustment in the production line, or manually by the engineer after shipment.

At this time, as described above, there are two types of gamma curves currently widely used, 2.2 and 2.5, each having advantages and disadvantages. That is, 2.2 gamma has difficulty in expressing the black level, and 2.5 gamma has difficulty in expressing the white level.

Therefore, in the digital TV according to the prior art, the viewer has no choice but to watch the TV with the brightness automatically adjusted to the gamma curve level set in the EPROM, so that the video output through the digital TV monitor has a dark screen or a bright screen. In many cases, there is a problem in that the viewer cannot satisfy the increasing visual demands of the viewer because it cannot be adjusted to the brightness of the viewer or the brightness that the viewer wants to emphasize.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and provides a video display device and a method for adjusting the gamma data thereof, by which a general viewer can adjust preset gamma data according to the viewer's convenience while viewing the video display device. Has its purpose.

An image display apparatus according to the present invention for achieving the above object comprises a tuner board for performing a tuning function for tuning a transmitted signal, receiving a user's request command including a gamma adjustment command, and transmitting the received command to a digital board; The digital board which transmits the gamma adjustment data selected by the user together with the image signal transmitted from the board to the drive board, and the image signal transmitted as the gamma adjustment data or the preset gamma adjustment data transmitted from the digital board are displayed in the characteristics of the display module. It characterized in that it comprises a drive board for adjusting and outputting according to.

Preferably, the driving board reads from the first memory unit a first memory unit that stores a plurality of preset gamma data, and gamma data for correcting an image signal received from the digital board from the first memory unit. A sub-microcom for a driving board which receives the signal from the board and transmits it to the image processor, and an image processor for correcting the linearity between the image signal and the output signal received from the digital board according to the gamma data transmitted from the sub-microcom. It is characterized by.

The digital board may include a main micom for controlling an integrated circuit of the entire image display apparatus, and a second memory unit configured to store one of a plurality of gamma data stored in the first memory unit according to a user's request command. It features.

A gamma data adjusting method of an image display apparatus of the present invention for achieving the above object is a gamma data correction method of an image display apparatus storing a plurality of preset gamma data. Correcting and outputting gamma data of the image signal tuned according to the set gamma data, and when the user receives an adjustment request command for the gamma data, the plurality of gamma data is sequentially read according to the user's adjustment request command Adjusting and outputting a gamma curve of an image signal, storing gamma data being corrected with respect to the current image signal when a selection command for the image signal currently output from the user is input, and using the stored gamma data Video signal By including the step of outputting feature a true.

Preferably, the preset gamma data is stored in a first memory unit of a driving board that adjusts and outputs a gamma curve of the image signal before shipment of the image display apparatus, and the gamma data being corrected for the current image signal is And a second memory unit other than the first memory unit.

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, an image display apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an internal configuration of an image display apparatus according to the present invention.

An internal configuration of a video display device (e.g., digital TV) capable of adjusting gamma data according to the present invention, as shown in FIG. 2, performs a tuning function for tuning the transmitted signal, and includes a user's request including a gamma adjustment command. The tuner board 70 receives a command and transmits it to the digital board 60, and the digital board transmitting the gamma adjustment data selected by the user to the driving board 50 together with the image signal transmitted from the tuner board 70 ( 60) to adjust the gamma data according to the characteristics of the display module (for example, CRT, LCD or PDP) and output the video signal transmitted according to the gamma adjustment data or the preset gamma adjustment data on the digital board 60. It is configured to include a drive board (50).

Herein, the driving board 50 stores an erasable programmable ROM (EPROM) (first memory unit) 53 that stores a plurality of preset gamma data, and an image signal received from the digital board 60. The sub-microcom 51 for the driving board which reads the gamma data for correction from the EPROM 53 or receives it from the digital board 60 and transmits it to the image processor 55 and the sub-microcom 51 transferred from the sub-microcom 51. And an image processor 55 for correcting and outputting linearity between the image signal and the output signal received from the digital board 60 according to the gamma data.

The digital board 60 requests a user's request for one of the main microcomputer 61 that controls the integrated circuit (including the sub-microcom) of the entire image display apparatus and the gamma data stored in the erasable programmable ROM (EPROM) 53. And a memory section (second memory section) 63 for storing according to the instruction. For reference, the memory unit 63 uses a nonvolatile memory device (for example, an electrically erasable programmable read-only memory (EEPROM)). Of course, if necessary, the memory unit 63 may be configured separately from the first memory unit 53 on the driving board instead of the digital board 60.

In addition, the user remote controller 80 allows a user to adjust the brightness level of the video signal according to the gamma data adjustments that the viewer adjusts through the hot keys for adjusting the gamma data together with general keys for controlling the video display device. Issue a request command.

In this case, the preset 2.2 gamma data and 2.5 gamma data are stored in the EPROM 53 of the driving board 50. In the present invention, gamma is represented by the relation of OSD (On Screen Display) output = maximum brightness * (X / 16) ^Gamma . For example, the gamma value is calculated and stored in the EPROM 53 in 16 steps. In this case, 16 levels of 2.2 and 2.5 gamma data are to be stored.

The gamma data modified or newly generated according to a user's request command is stored in the memory unit 63 of the digital board 60.

3 is a flowchart illustrating a gamma data adjusting method of an image display apparatus according to the present invention.

In the gamma data adjusting method of the image display apparatus according to the present invention, when the power of the image display apparatus is turned on, the image display apparatus corrects and outputs the gamma data of the image signal using the gamma data according to the gamma data storage position (S10).

That is, when the power of the image display apparatus is turned on, when the gamma data preset by the user is present in the memory unit 63, the main microcomputer 61 may store the memory unit together with the image signal transmitted from the tuner board 70. The gamma data of 63 is transmitted to the driving board 50. The sub-microcom 51 of the driving board 50 transmits an image signal transmitted from the digital board 60 to the image processor 55. At this time, whether the preset gamma data is transmitted to the memory unit 63 together with the image signal. Alternatively, it is determined whether only the video signal is transmitted. If gamma data is transmitted, the transmitted gamma data and the video signal are transmitted to the image processor 55. If gamma data is not transmitted, the gamma preset in the EPROM 53 is transmitted. The data and the transmitted image signal are transmitted to the image processor (55). Accordingly, the image processor 55 transmits the image signal to the display module (not shown) after adjusting the gamma curve of the image signal with the transmitted gamma data.

Subsequently, the main microcomputer 61 determines whether a gamma data correction request signal is input (S12). That is, when the user of the video display device wants to change the image quality of the display module, when the hot key for adjusting the gamma data is driven through the user's remote controller 80, the sub-microcom 71 of the tuner board 70 receives the This is transmitted to the main microcomputer 61.

If there is a determination signal (S12) request signal, the main microcomputer 61 transmits the gamma data adjustment request command requested by the user to the submicrocom 51 of the driving board 50, and receives the request of the driving board 50. The sub-microcom 51 reads the gamma data preset in the EPROM 53 and sequentially writes the gamma data into the image processor 55 according to a user's operation using the user remote controller 80 to write an image signal. The gamma curve is adjusted and the adjusted video signal is output (S14, S16). That is, when a control signal for adjusting gamma data is input from the main microcomputer 61, the brightness displayed on the display module is displayed for each of 16 preset levels according to a user's request command.

The main microcomputer 61 determines whether the current video signal is selected from the user remote controller 80 (S20).

Judgment result (S20) When the current video signal is selected, the main microcomputer S20 receives the selected gamma data from the sub-microcom 51 of the driving board 50 and stores it in the memory unit 63 (S22). That is, when the user finds a value that satisfies the user, the user inputs a storage request command for the user, and the main microcomputer 61 receives the newly stored gamma data in the memory unit 63.

Accordingly, the image processor 55 receives the image (R, G, B) output from the VDP, the main microcomputer 61, and outputs the corrected image (R, G, B) signal through gamma data newly set by the user. Let's do it.

In the video display device and the gamma data adjusting method according to the present invention, since a gamma correction value can be selected for a general user to set a desired image quality, a black level or a white level can be emphasized according to a user's taste so that the user's visual characteristics There is an effect that can be satisfied.

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.

1 is a block diagram illustrating an internal configuration of a digital TV for explaining a method of storing and loading gamma data according to the related art.

2 is a block diagram showing an internal configuration of an image display apparatus according to the present invention.

3 is a flowchart for explaining a method of adjusting gamma data in an image display apparatus according to the present invention.

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

50: drive board 51: sub-microcom

53: EPROM 55: Image Processor

60: digital board 61: the main microcomputer

63: memory 70: tuner board

71: sub micom 80: user remote control

Claims (5)

A tuner board which performs a tuning function of tuning the transmitted signal and receives a user's request command including a gamma adjustment command and transmits the received command to the digital board; A digital board transmitting the gamma adjustment data selected by the user together with the image signal transmitted from the tuner board to the driving board; And a driving board for adjusting the gamma curve of the transmitted video signal with the gamma adjustment data transmitted from the digital board or the preset gamma adjustment data and outputting the gamma curve to the image display module. The method of claim 1, The driving board reads from the first memory unit a first memory unit which stores a plurality of preset gamma data, and gamma data for correcting an image signal received from the digital board from the first memory unit or from the digital board. And a video processor for correcting linearity between the video signal and the output signal received from the digital board according to the gamma data transmitted from the sub-microcom. The video display device. The method of claim 1, The digital board includes a main microcomputer for controlling an integrated circuit of the image display apparatus and a second memory unit for storing one of a plurality of gamma data stored in the first memory unit according to a user's request command. The video display device. In the gamma data correction method of the video display device that stores a plurality of preset gamma data, Correcting and outputting gamma data of a tuned video signal according to preset gamma data when the image display apparatus is powered on; Adjusting a gamma curve of the video signal by sequentially reading the plurality of gamma data according to an adjustment request command of the user, when an adjustment request command for the gamma data is received from a user; Storing gamma data that is being corrected for the current video signal when a selection command for a video signal currently output from the user is input; And correcting and outputting the image signal by using the stored gamma data. The method of claim 4, wherein The preset gamma data is stored in a first memory unit of a driving board that adjusts and outputs a gamma curve of the image signal before shipment of the image display apparatus, and the gamma data being corrected for the current image signal is stored in the first image. And a second memory unit other than the memory unit.