KR20110001545A - Image display dvic and the method for controlling - Google Patents

Abstract

PURPOSE: An image display device and a method for controlling are provided to automatically illuminance level according to user intention according to ambient light. CONSTITUTION: Ambient light is detected by an illuminance sensor(415). The data of user luminance is extracted(430). User luminance is corresponded to the detected ambient light. The luminance of the input image data is determined(440). The image display device comprised of the illuminance sensor, a display unit, a calculation unit, and a memory unit.

Description

Image display dvic and the method for controlling}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display, and more particularly, to an image display and a method of controlling the same so that proper luminance can be realized according to brightness and peripheral illumination of input image data.

Liquid crystal displays using liquid crystal displays (LCDs) display images by adjusting light transmittance of liquid crystal cells according to video signals. The liquid crystal display device is implemented in an active matrix type in which switching elements are formed in each cell, and is applied to display devices such as computer monitors, office equipment, and cellular phones.

In an active matrix liquid crystal display device, a switching element called a thin film transistor (hereinafter, referred to as a TFT) is mainly used.

Such a liquid crystal display controls the brightness of the display screen through brightness control of the backlight.

As a method of controlling the brightness of the display screen, a method of adjusting the brightness of the image displayed by the curve shown in FIG. 2 through an operation as shown in FIG. 1 is performed. Referring to FIG. 1, a conventional luminance adjusting operation is performed by reading RGB data on an image input to an image display device (step 105) and calculating illuminance and color temperature of a surrounding environment (step 110).

The average of the calculated illuminance values is calculated (step 115), the amount of change in the illuminance value is detected (step 120), and the preset luminance level value is read (step 125) and applied to the image as shown in the graph shown in FIG. However, the brightness is adjusted (step 130). However, as the image quality and the user's professionalism increase, there is a difficulty in satisfying the desire to watch an image suitable for each user's taste.

An object of the present invention is to provide an apparatus and a method of an image display apparatus that can automatically adjust a luminance level according to a viewer's taste according to an ambient illuminance of a display apparatus.

According to an embodiment of the present invention, a display device may include: an illuminance sensor configured to detect an ambient illuminance in which the display device is installed; A display unit for outputting an image signal input from the outside and outputting the image at a user luminance setting value according to a user request; A calculation unit configured to calculate a user luminance adjustment value set by the user according to the detection state of the illuminance detection unit; A memory unit for storing a user luminance adjustment value corresponding to an illuminance level; And a controller configured to adjust the luminance using a user luminance adjustment value calculated by the calculator to correspond to the sensing state of the illuminance sensor.

According to the proposed embodiment, the brightness level of the image is changed according to the ambient brightness in which the display device is installed and the brightness level of the input image data. It has the effect of watching the video.

Hereinafter, the proposed specific embodiments will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a video display device to which an embodiment of the present invention is applied.

According to an exemplary embodiment of the present invention, a display device includes a data receiver 100, a video / audio decoder 102, an audio signal processor 104, a speaker 108, a video signal processor 106, a display panel 110, and a backlight. And a backlight driver 114, a memory unit 116, an illuminance detector 118, a luminance level detector 120, and a controller 122.

The data receiver 100 receives data input from the outside. The data receiver 100 may include a digital tuner for receiving a digital broadcast signal, an analog tuner for receiving an analog broadcast signal, a digital external signal input terminal and an analog external signal input terminal to which an external device is connected, and a PVR (Personal Video Recorder). ) And digital recorders such as digital video recorders (DVRs).

The digital external signal input terminal may be an input terminal for a digital cable broadcasting signal or a digital external player such as a DVD, and the analog external signal input terminal may be a VCR signal input terminal or an analog cable broadcasting signal input terminal.

The digital tuner tunes a transport stream of a desired channel by user selection among transport streams (TS), which are digital broadcast signals input through a digital broadcast antenna. The analog tuner tunes an image program of a desired channel by a user's choice among image programs, which are analog broadcast signals input through an analog broadcast antenna.

Accordingly, the data received through the data receiver 100 may include both an analog television broadcasting program and a digital broadcasting program in real time broadcasting, and a playback program, a recording program, and a cable broadcasting program input from an external player. Here, the data includes a video signal, an audio signal, and a data signal in the case of a digital signal, and includes a video signal and an audio signal in the case of an analog signal.

The video / audio decoder 102 decodes the video signal and the audio signal from the data received through the data receiver 100 and transmits the decoded signal to the audio signal processor 104 and the video signal processor 106, respectively.

The audio signal processor 104 performs signal processing such as digitization and filtering of the audio signal transmitted from the video / audio decoder 102, and outputs the audio signal through which the signal processing is performed through the speaker 106.

The video signal processor 106 performs signal processing such as digitization and filtering of the video signal transmitted from the video / audio decoder 102 into an RGB signal, and the video signal on which the signal processing is performed is displayed in the display module 110. Is displayed via.

In addition, the video signal processor 106 includes a luminance level detector 120 that detects the luminance level for each frame of the input image. The luminance level detector 120 may detect an average luminance level (APL) for each frame. The brightness level detector 120 may be included in the video signal processor 106. In the embodiment of the present invention, the brightness level detector 120 is represented as one means separately configured for convenience of description. The luminance level detector 120 measures an APL for each image pdlxjml frame input through the data receiver 100 and transmits the measured APL to the controller 122.

Although not shown in the drawings, the display module 110 may include a data driver and a timing controller configured to substantially drive the plurality of data lines according to a video signal of the liquid crystal panel and the video signal processor 106 including a plurality of gate lines and LCD transistors. And a gate driver configured to receive a driving signal from the driving signal and drive the plurality of gate lines.

The backlight 112 supplies light to the front surface of the liquid crystal panel. The backlight 112 includes a plurality of backlights installed to overlap the liquid crystal panel. The backlight driver 114 supplies the driving current according to the resistor value transmitted through the controller 122 to the backlight 112. Accordingly, the liquid crystal panel has a high luminance and a wide light emitting surface.

In this case, if the backlight 112 is not driven even when the image signal is being displayed through the display module 110, the user cannot view the image displayed on the display module 110. That is, as the backlight 112 applied with the driving current through the backlight driver 114 emits light, the user can watch the image displayed through the display module 110.

In addition, the screen brightness of the displayed display module 110 is adjusted by changing a driving current value supplied to the backlight 112 through the control unit 122, and the height of the driving current value supplied to the backlight 112 is increased. As the / low, the brightness of the displayed screen also changes.

The memory unit 116 stores programs related to the operation of the display apparatus and various data generated during the operation of the display apparatus. In addition, the memory unit 116 stores data obtained corresponding to product model information of the display apparatus. In particular, the memory unit 116 stores at least one user luminance value among a minimum luminance value and a maximum luminance value set by a user. In addition, a function of storing a user luminance according to the illuminance calculated according to the luminance value of the user.

The illuminance detector 118 detects the illuminance around the display apparatus. That is, the illuminance detecting unit 118 includes a photo sensor, thereby converting an external optical signal into an electrical signal and measuring the electrical signal to detect external illuminance.

The controller 122 performs a function of extracting or calculating data corresponding to the illuminance detection state detected by the illuminance detecting unit 118 from the memory unit 116. The calculated luminance level value may be calculated by at least one value of a minimum or maximum luminance level previously set by a user, and an operation unit for the operation may be separately provided.

The calculated equation is as follows.

f (eye Q) = [(P1-P2) * Lux_avr) / (L1-L2)] + b

The above equation is a first variable comprising an average luminance level, a first variable consisting of a difference between a minimum luminance value P1 and a maximum luminance value P2 received from a user, which is a coefficient of the first variable, and an offset luminance value constant b. The solution obtained through the first equation (second variable) is set to a register value for adjusting the brightness level of the display device. That is, the second variable f (eye Q) is set to a register value for adjusting the backlight brightness.

Hereinafter, a process of generating the data and an operation of the controller for adjusting the luminance value according to the ambient illumination according to the user set luminance value will be described in detail.

4 is a flowchart illustrating an operation of adjusting luminance according to an exemplary embodiment of the present invention, FIG. 5 is a graph illustrating a user-set luminance curve according to an exemplary embodiment of the present invention, and FIG. 5 is a flowchart illustrating another exemplary embodiment of the present invention. A graph showing a user set luminance curve.

The controller 122 checks the RGB data periodically or continuously with respect to an image signal input from the outside (step 405). The controller 122 checks the illuminance value around the display device in which the display device is installed through the illuminance sensor 118. In operation 410, the controller 122 calculates an average illuminance value by periodically or continuously checking the illuminance value for a predetermined time.

The controller 122 compares the calculated average illuminance value with a previous illuminance value (step 420) and checks the luminance change of the image according to the illuminance when a next occurrence beyond the reference range occurs. Therefore, the controller 122 checks whether the user-set luminance value stored in the memory unit 116 is applied (step 425), and if the user wants to change the luminance value to the default luminance adjustment value according to the illuminance, the controller 122 changes the value to the memory unit 116. ) And apply the corresponding luminance value to the image (step 440).

On the other hand, the controller 122 performs a function of reading and calculating a user luminance value previously stored in the memory unit 116 when adjusting the luminance of an image by applying a user set luminance value according to illumination. The user luminance setting value according to the calculation operation and illuminance will be described in detail with reference to FIGS. 5 to 6. Therefore, the controller 122 controls the display of the image by adjusting the luminance of the input image according to the calculated user set luminance value (step 440).

5 is a graph according to a luminance adjustment value appearing when setting user brightness according to an exemplary embodiment of the present invention.

The graph shown in an embodiment of the present invention shows a user luminance adjustment curve calculated and determined when both a minimum value and a maximum value are set as desired luminance values from a user. S ₁ is a default stored luminance adjustment curve, which is a graph of luminance adjustment values applied in an operation of automatically adjusting luminance according to a conventional peripheral illuminance. In addition, S ₂ when the minimum luminance value (a) and the maximum luminance value (b) is set according to an embodiment of the present invention by the slope value calculated according to the second variable calculated through the above Equation 1 It is a graph determined.

That is, when the minimum luminance value (a) and the maximum luminance value (b) to be adjusted according to the ambient illuminance are set by the user, the controller 122 determines the curve of the user setting luminance through Equation 1, and accordingly, the illuminance The screen is adjusted to the luminance value set by the user according to the illuminance detected by the detector 118.

6 is a graph according to a luminance adjustment value appearing when setting user brightness according to another exemplary embodiment of the present invention.

The graph shown in another embodiment of the present invention shows a user luminance adjustment curve calculated and determined when a maximum luminance value is set as a desired luminance value from a user. The graph shows a graph that is calculated when 100, 80, 70, 60, 40, 20, 0 is set as the desired luminance maximum value from the user.

For example, if the user sets the luminance value 70 at the peripheral illumination 200Lx, the luminance value is adjusted in the range of 0 to 70 according to the peripheral illumination. In this case, the luminance value according to the illuminance value is calculated by Equation 2 below.

f (eyeQ) = [((UI 70-UI _min ) * Lux_avr) / 300] + UI _offset : UI 0 ~ 70

Therefore, according to an embodiment of the present invention, the user can select at least one of the minimum or maximum value of the luminance to be changed according to the ambient illumination, and adjust the screen to the luminance suitable for the user's personal preference through a predetermined calculation process. In addition, when there are a plurality of users, each user may have an identifier so that each user has a user brightness setting value.

1 is a flowchart of a luminance adjustment operation according to a conventional peripheral illumination.

2 is a graph illustrating a luminance adjustment value appearing in the conventional luminance adjustment operation.

3 is a block diagram of a video display device to which an embodiment of the present invention is applied.

4 is a graph illustrating a luminance adjustment curve according to a user luminance setting value according to an embodiment of the present invention.

5 is a graph illustrating a brightness adjustment curve according to a user brightness setting value according to another embodiment of the present invention.

Claims (8)

In the video display device, An illuminance sensor for detecting an ambient illuminance in which the display device is installed; A display unit for outputting an image signal input from the outside and outputting the image at a user luminance setting value according to a user request; A calculator configured to calculate a user luminance adjustment value set by a user according to a sensing state of the illuminance sensor; A memory unit which stores a user luminance adjustment value corresponding to the illuminance level; And a controller which adjusts the luminance using the user luminance adjustment value calculated by the calculator in correspondence to the sensing state of the illuminance sensor. The image display of claim 1, wherein the user luminance adjustment value is set by receiving at least one of a minimum luminance value and a maximum luminance value from a user. The image display of claim 2, wherein the calculator calculates a luminance value to be applied according to the sensed illuminance using at least one luminance value set by the user. The image display of claim 3, wherein the memory unit stores the calculated luminance value. In the control method of the display device, Detecting peripheral illuminance in which the display device is installed; Extracting data on a user luminance value corresponding to the sensed ambient illuminance; And determining the luminance of the input image data by using the extracted data. 6. The method of claim 5, wherein the user luminance value is a value calculated by a linear equation by selecting at least one of a minimum luminance value and a maximum luminance value. 7. The method of claim 6, further comprising: storing the calculated value; And extracting the stored value according to the ambient illuminance and applying the stored value to a corresponding image. The method of claim 5, wherein the luminance value of the image is changed to a preset user setting luminance value according to a change state of peripheral illumination measured periodically.

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