KR20100030097A - Display apparatus for determining whether there is an error of a sensor detecting brightness and method for detecting an error of sensor applying to the same - Google Patents

Abstract

PURPOSE: A display apparatus which is able to easily determine error of a sensor measuring brightness is provided. CONSTITUTION: A display apparatus which determines error of a sensor measuring brightness comprises: the sensor(160) and controller(120). The sensor measures brightness of a back light and comprises a brightness sensor or color sensor. The controller receives measured value of brightness and determines error of the sensor using the measured value. The controller comprises a sensor controller and main controller.

Description

Display apparatus for determining whether there is an error of a sensor detecting brightness and method for detecting an error of sensor applying to the same}

The present invention relates to a display device and a sensor error detection method, and more particularly, to a display device having a sensor for measuring the brightness of the backlight and a sensor error detection method applied thereto.

Display devices are classified into general display devices and professional display devices according to their use. Among these, professional display devices need to provide high quality images. Therefore, the professional display device is provided with a brightness sensor to display the brightness of the image constantly.

However, since the brightness sensor is mounted inside, it is difficult for the user to recognize whether or not the defect. In addition, since the display device operates normally even when the luminance sensor is defective, the user may not recognize an error of the luminance sensor through the currently displayed screen.

A user purchases and uses an expensive professional display device to guarantee a high quality image, but when an error occurs in the luminance sensor, the user does not receive a high quality image.

Accordingly, a search for a scheme for allowing a user to easily recognize the presence or absence of a luminance sensor error of the display device is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to enable a user to easily recognize the presence or absence of a luminance sensor error of a display device. The present invention provides a display device for determining whether an error occurs in a sensor unit and a sensor error detection method applied thereto.

According to an exemplary embodiment of the present invention, a display unit includes: a sensor unit configured to measure brightness of a backlight; And a controller configured to receive a luminance measurement value of the sensor unit and determine whether an error exists in the sensor unit using the luminance measurement value.

The control unit may include a sensor control unit controlling the sensor unit; And a main control unit for controlling the sensor control unit, wherein the sensor control unit outputs an error signal indicating that there is an error in the sensor unit when the luminance measurement value is not input.

The sensor controller may output an error signal indicating that there is an error in the sensor unit when the difference between the luminance measurement value and the input luminance value exceeds a threshold.

When the error control unit receives the error signal, the main control unit deactivates the sensor unit and the sensor control unit, and controls the sensor unit to display that there is an error.

The display device may further include a light emitting device indicating that there is an error in the sensor unit. The main controller may control the light emitting device to emit light or blink when the error signal is received.

When the error signal is received, the main controller preferably controls a message indicating that there is an error in the sensor unit to be displayed on a display screen.

The sensor controller may output a backlight luminance correction value for correcting a difference between the luminance measurement value and the input luminance value when the difference between the luminance measurement value and the input luminance value is equal to or less than a threshold value. .

The main controller may control the luminance of the backlight to be corrected according to the received backlight luminance correction value.

In addition, the main control unit, if the signal is not received from the sensor control unit for a predetermined time, it is preferable to control to display that there is an error in the sensor control unit.

In addition, the sensor unit preferably includes a luminance sensor or a color sensor.

On the other hand, according to an embodiment of the present invention, a sensor error detection method of a display device including a sensor unit for measuring the brightness of the backlight and a sensor control unit for controlling the sensor, the brightness of the backlight by the sensor unit Making; And determining, by the sensor controller, whether there is an error in the sensor unit by using a luminance measurement value.

In the determining step, when the luminance measurement value is not input to the sensor controller, it is determined that there is an error in the sensor unit.

In the determining step, when the difference between the luminance measurement value and the input luminance value exceeds a threshold value, the sensor unit may determine that there is an error.

The method may further include outputting an error signal indicating that there is an error in the sensor unit when it is determined that there is an error in the sensor unit.

And, when receiving the error signal, deactivating the sensor unit and the sensor control unit, and indicating that there is an error in the sensor unit; preferably further comprises a.

In the display step, it is preferable to display an error in the sensor unit by emitting or flashing a light emitting element indicating that there is an error in the sensor unit.

In the displaying step, it is preferable to display an error in the sensor unit by displaying a message indicating that there is an error in the sensor unit on the display screen.

The method may further include outputting a backlight brightness correction value for correcting a difference between the brightness measurement value and the input brightness value when the difference between the brightness measurement value and the input brightness value is equal to or less than a threshold value. Do.

The method may further include correcting the brightness of the backlight according to the received backlight brightness correction value.

The sensor controller may further include displaying an error in the sensor controller when no signal is output for a predetermined time.

In addition, the sensor unit preferably includes a luminance sensor or a color sensor.

On the other hand, the display device according to an embodiment of the present invention, the sensor unit for measuring the brightness of the backlight; And a main controller configured to receive a luminance measurement value of the sensor unit, control the backlight luminance according to the input luminance measurement value, and determine whether the sensor unit has an error using the luminance measurement value.

According to various embodiments of the present disclosure, it is possible to provide a display device that receives a luminance measurement value of a sensor unit and determines whether there is an error in the sensor unit using the luminance measurement value, and a sensor error detection method applied thereto. It is easy for the user to know the presence of the luminance sensor error.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a block diagram of a structure of an LCD display device according to an embodiment of the present invention. As shown in FIG. 1, the LCD display device includes a graphic interface 110, a controller 100, a driver 130, a backlight 140, an LCD panel 150, a sensor unit 160, and a light emitting device 180. It includes.

In addition, the controller 100 includes a main controller 120 and a sensor controller 170. Here, the sensor controller 170 controls the sensor unit 160, and the main sensor unit 120 controls the first half of the sensor controller 170 and the LCD display device. The sensor controller 170 and the main controller 120 will be described in detail later.

The graphic interface 110 is connected to an external device and receives an image signal from the external device. The graphic interface 110 transmits the input video signal to the main controller 120. The graphic interface 110 may use a D-SUB terminal, a DVI terminal, or the like.

The main controller 120 controls the overall operation of the LCD display device. The main controller 120 performs image signal processing such as video scaling on the image signal input through the graphic interface 110. In addition, the main controller 120 controls the driver 130 to display an image corresponding to the processed image signal. Functions other than the main control unit 120 will be described later in detail.

The driver 130 generates a driving signal for driving the backlight 140 and the LCD panel 150 based on the image signal input from the main controller 120. The driver 130 outputs a driving signal to the backlight 140 and the LCD panel 150 to drive the backlight 140 and the LCD panel 150.

The backlight 140 generates light based on the driving current applied from the driver 130 and irradiates the LCD panel 150 with the light. Lamps for backlight 140 include Cold Cathode Fluorescent Lamps (CCFLs), Hot Cathode Fluorescent Lamps (HCFLs), Flat fluorescent lamps (FFLs), and LEDs (Light-Emitting). Diode) may be used.

The LCD panel 140 adjusts the transmittance of light generated by the backlight 136 to visualize an image signal and display it on the screen.

The sensor unit 160 measures the luminance of the backlight 140. The sensor unit 160 is disposed between the backlight 140 and the backlight reflection mirror. However, the sensor unit 160 may be disposed in any part other than the part capable of measuring the brightness of the backlight 140. The sensor unit 160 may include a luminance sensor or a color sensor. The sensor unit 160 transmits the luminance measurement value to the sensor control unit 170.

The sensor controller 170 controls the sensor unit 160 and feeds back the backlight luminance correction value to the main controller 120 using the luminance measurement value measured by the sensor unit 160.

In detail, the sensor controller 170 receives a luminance measurement value from the sensor unit 160. The sensor controller 170 compares the luminance measured value with the luminance value input by the user.

In this process, since the sensor unit 160 may be disposed behind the backlight 140, the luminance value of the screen and the luminance value measured by the sensor unit 160 have an error according to the measurement position. Therefore, the sensor controller 170 stores the luminance value measured at the position of the sensor unit 160 and the luminance value of the screen corresponding thereto in the form of a comparison table in the memory area. The sensor controller 170 converts the measured luminance value using the comparison table when comparing the luminance value input by the user with the measured luminance value.

Here, the luminance value input by the user means a luminance value set to be displayed on the current screen. The luminance value input by the user may be input using a setting button provided in the LCD display apparatus. In addition, the luminance value input by the user may also include the luminance value included in the input image signal. That is, the luminance value input by the user may mean a luminance value of an image to be displayed on the current display screen.

When the difference between the luminance measurement value and the luminance value input by the user is equal to or less than a threshold value, the sensor controller 170 returns the backlight luminance correction value for correcting the difference between the luminance measurement value and the input luminance value to the main controller 120. Output When the difference between the luminance measurement value and the input luminance value is less than or equal to the threshold value, since the sensor controller 170 determines that the sensor unit 160 is normally operated, the sensor controller 160 outputs the backlight luminance correction value.

Here, the luminance correction value is a correction value for matching the luminance of the backlight with the input luminance value. Since the user wants to display the image of the screen with the input luminance value, the sensor controller 170 is measured by using the sensor unit 160 so that the image displayed on the screen is displayed according to the input luminance value. The backlight luminance correction value for correcting the difference between the luminance measurement value of the current backlight 140 and the input luminance value is output.

The threshold value means a maximum difference value between the luminance value input by the user and the luminance measurement value measured by the sensor unit 160 operating without errors. That is, when the difference between the input luminance value and the luminance measurement value is less than or equal to the threshold value, the sensor controller 170 may determine that the sensor unit 160 operates without an error. However, when the difference between the input luminance value and the luminance measurement value exceeds the threshold value, the sensor controller 170 determines that there is an error in the sensor unit 160. This is because the case where the luminance measurement value and the input luminance value differ too much may be the case where the sensor unit 160 does not measure the luminance of the backlight normally and outputs an incorrect value. The threshold value may be preset to the specification of the product.

As such, when the difference between the luminance measurement value and the input luminance value exceeds the threshold, the sensor controller 170 may output an error signal indicating that there is an error in the sensor unit 160 instead of the backlight luminance correction value. )

In addition, the sensor controller 170 outputs an error signal indicating that there is an error in the sensor unit 160 to the main controller 120 even when the luminance measurement value is not input from the sensor unit 160. This is because the case where the luminance measurement value is not input from the sensor unit 160 is likely to be the case where the luminance measurement value is not output due to a failure of the sensor unit 160.

The main controller 120 controls the luminance of the backlight to be corrected according to the backlight luminance correction value input from the sensor controller 170. Here, the backlight luminance correction value represents a correction value for correcting a difference between the luminance measurement value of the backlight measured by the sensor unit 160 and the luminance value input by the user.

In detail, the main controller 120 controls the driver 130 to change the luminance of the backlight 140 according to the backlight luminance correction value. The driver 130 applies the corrected driving signal to the backlight 140 to correspond to the luminance correction value.

On the other hand, when an error signal is received from the sensor controller 170, the main controller 120 deactivates the sensor unit 160 and the sensor controller 170. Since there is an error in the sensor unit 160, this is to prevent the secondary failure due to the operation of the error sensor unit 160. Here, the error signal means a feedback signal indicating that there is an error in the sensor unit 160.

In addition, the main controller 120 controls the sensor unit 160 to display an error. The main controller 120 may indicate that there is an error in the sensor unit 160 in various ways. For example, the main controller 120 may display an error message on the display screen or display the light using an LED.

Specifically, the display device includes a light emitting device 180 indicating that there is an error in the sensor unit 160, and the main controller 120 controls the light emitting device 180 to emit light or blink when an error signal is received. do.

In addition, when receiving an error signal, the main controller 120 may control a message indicating that there is an error in the sensor unit 160 to be displayed on the display screen.

As such, the user may easily determine whether an error of the sensor unit 160 is obtained through the light emitting device 180.

Meanwhile, when no signal is received from the sensor controller 170 for a predetermined time, the main controller 120 controls the sensor controller 170 to display an error. This is because a signal is not output from the sensor controller 170 itself, and therefore, the sensor controller 170 is more likely to have an error than the sensor unit 160. Here, the predetermined time corresponds to the time to wait to determine if there is an error in the sensor controller 170. The predetermined time is a time larger than a period in which a signal is output in a state in which the sensor controller 170 operates normally.

As such, when it is determined that there is an error in the sensor controller 170, the main controller 120 displays the error using the light emitting device or displays an error message on the screen to notify the user that there is an error in the sensor controller 170. I can display it.

Accordingly, the light emitting device 180 may display an error in the sensor unit 160 or may display an error in the sensor controller 170. For example, the display apparatus includes a plurality of light emitting elements 180, wherein the first light emitting element indicates an error in the sensor unit 160, and the second light emitting element indicates an error in the sensor control unit 170. It may be implemented to indicate that there is. As the light emitting device 180, various devices emitting light may be used. For example, a light emitting diode (LED), an organic luminescence (EL), or the like may be used.

Hereinafter, a method of detecting and displaying an error of the sensor unit 160 will be described in detail. 2 is a flowchart illustrating a sensor error detection method according to an embodiment of the present invention.

 First, the sensor unit 160 measures the brightness of the backlight 140 (S210). Thereafter, the sensor controller 170 determines whether the luminance measurement value is input from the sensor unit 160 (S220).

When the luminance measurement value is input from the sensor unit 160 (S220-Y), the sensor controller 170 determines whether a difference between the luminance measurement value and the input luminance value is equal to or less than a threshold value (S230).

When the difference between the luminance measurement value and the input luminance value is equal to or less than the threshold value (S230 -Y), the sensor controller 170 determines that there is no error in the sensor unit 160, and the difference between the luminance measurement value and the input luminance value is determined. The backlight luminance correction value for correcting the output is output to the main controller 120 (S233). The main controller 120 controls the luminance of the backlight 140 to be corrected according to the backlight luminance correction value (S236).

Through this process, the display device uses the sensor unit 160 to make the luminance of the backlight 140 equal to the luminance value input by the user, and display the image in this state.

On the other hand, the luminance measurement value is not input to the sensor controller 170 (S220-N) and the signal is output from the sensor controller 170 (S240-Y), or the difference between the luminance measurement value and the input luminance value is equal to or less than a threshold value. In operation S230 -N, the sensor controller 170 determines that there is an error in the sensor unit 160, and outputs an error signal of the sensor unit 160 to the main controller 120 (S243).

In operation S246, the main controller 120 deactivates the sensor unit 160 and the sensor controller 170 when receiving the error signal. Thereafter, the main controller 120 controls the sensor unit 160 to display an error (S249).

A method of displaying an error in the sensor unit 160 includes a method of using the light emitting device 180 and a method of displaying an error message on the screen. This will be described below with reference to FIGS. 3 and 4.

3 is a diagram illustrating a case in which a sensor error message 300 is displayed in an OSD according to an embodiment of the present invention. As shown in FIG. 3, if it is determined that there is an error in the sensor unit 160, the LCD display device may display an error message 300 indicating that there is an error in the sensor on the screen.

4 is a diagram illustrating a case in which an error of a sensor is displayed by the first LED 400 according to an exemplary embodiment of the present invention. As shown in FIG. 4, the LCD display device includes a first LED 400 and a second LED 600 corresponding to the light emitting device 180 in the front case portion.

As shown in FIG. 4, the first LED 400 displays “S.Err (Sensor Error)” next to the first LED 400, indicating that the first LED 400 indicates an error of the sensor unit 160. The second LED 600 may display “SCErr (Sensorrr Error)” next to display an error of the sensor controller 170.

In FIG. 4, since the first LED 400 emits light, it may be understood that the sensor unit 160 has an error.

Through this, the user can easily confirm that there is an error in the sensor unit 160.

2, when no signal is output from the sensor controller 170 (S240), the main controller 120 determines that there is an error in the sensor controller 170, and thus the sensor controller 160 and the sensor controller ( Deactivate 170) (S250). The main controller 120 controls the sensor controller 170 to display that there is an error (S253).

A method of displaying an error in the sensor controller 170 includes a method of using the light emitting device 180 and a method of displaying an error message on a screen. This will be described below with reference to FIGS. 5 and 6.

 5 is a diagram illustrating a case in which a sensor controller error message is displayed on an OSD in accordance with an embodiment of the present invention. As shown in FIG. 5, when it is determined that an error occurs in the sensor control unit 170, the LCD display device may display an error message 500 indicating that an error exists in the sensor control unit 170 on the screen using an OSD. .

6 is a diagram illustrating a case in which an error of a sensor controller is displayed as an LED according to an embodiment of the present invention. As shown in FIG. 6, the LCD display device includes a first LED 400 and a second LED 600 corresponding to the light emitting device 180 in the front case portion.

As shown in FIG. 6, the first LED 400 displays “S.Err (Sensor Error)” next to the first LED 400, indicating that the first LED 400 indicates an error of the sensor unit 160. The second LED 600 may display “SCErr (Sensorrr Error)” next to indicate an error of the sensor controller 170.

In FIG. 6, since the second LED 600 emits light, it may be understood that the sensor controller 170 indicates that there is an error.

Through this, the user can easily confirm that there is an error in the sensor controller 170.

By the above-described process, the user can easily check the presence or absence of the error of the sensor unit 160 included in the LCD display device.

In the present embodiment, the sensor unit 160 is described as being controlled by a separate sensor controller 170, but the main controller 120 may be implemented to perform all the functions of the sensor controller 170 without the sensor controller 170. Of course. This will be described with reference to FIG. 7.

7 is a block diagram showing the structure of an LCD display device according to another embodiment of the present invention. Since FIG. 7 is mostly similar to FIG. 1, redundant descriptions are omitted.

Unlike in FIG. 1, the LCD display device of FIG. 7 includes the sensor controller 170, and the sensor unit 160 is controlled by the main controller 120.

Accordingly, the main controller 120 receives the luminance measurement value of the sensor unit 160, controls the luminance of the backlight 140 according to the input luminance measurement value, and uses the luminance measurement value of the sensor unit 160. Determine whether there is an error. In addition, all of the functions of the sensor controller 170 described above may be implemented by the main controller 120.

As described above, the technical idea of the present invention may be applied to the main controller 120 only without the separate sensor controller 170.

In the present embodiment, the display device is described as an LCD display device, but any display device including a backlight may be applied to the technical idea of the present invention.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a block diagram of a structure of an LCD display device according to an embodiment of the present invention;

2 is a flowchart illustrating a sensor error detection method according to an embodiment of the present invention;

3 is a diagram illustrating a case in which a sensor error message is displayed in an OSD according to one embodiment of the present invention;

4 is a diagram illustrating a case in which an error of a sensor is displayed by LEDs according to an embodiment of the present invention;

5 is a diagram illustrating a case in which a sensor controller error message is displayed in an OSD according to one embodiment of the present invention;

6 is a diagram illustrating a case in which an error of a sensor controller is displayed as an LED according to an embodiment of the present invention;

7 is a block diagram showing the structure of an LCD display device according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: graphical interface 120: the main control unit

130: driving unit 140: backlight

150: LCD panel 160: sensor unit

170: sensor control unit

Claims (22)

Sensor unit for measuring the brightness of the backlight; And And a controller configured to receive a luminance measurement value of the sensor unit and determine whether an error occurs in the sensor unit by using the luminance measurement value. The method of claim 1, The control unit, A sensor controller for controlling the sensor unit; And A main controller for controlling the sensor controller; The sensor control unit, And when the luminance measurement value is not input, outputs an error signal indicating that there is an error in the sensor unit. The method of claim 2, The sensor control unit, And outputting an error signal indicating that there is an error in the sensor unit when a difference between the luminance measurement value and the input luminance value exceeds a threshold value. The method of claim 3, wherein The main control unit, And when the error signal is received, deactivate the sensor unit and the sensor control unit, and control the display unit to display that there is an error. The method of claim 4, wherein Further comprising a; light emitting device for indicating that there is an error in the sensor unit, The main control unit, And when the error signal is received, controlling the light emitting device to emit light or to flash. The method of claim 4, wherein The main control unit, And receiving the error signal so that a message indicating that there is an error in the sensor unit is displayed on a display screen. The method of claim 2, The sensor control unit, And a backlight luminance correction value for correcting a difference between the luminance measurement value and the input luminance value when the difference between the luminance measurement value and the input luminance value is equal to or less than a threshold value. The method of claim 7, wherein The main control unit, And adjust the luminance of the backlight to be corrected according to the received backlight luminance correction value. The method of claim 2, The main control unit, And not displaying a signal in the sensor controller when the signal is not received from the sensor controller for a predetermined time. The method of claim 1, The sensor unit, Display device comprising a luminance sensor or a color sensor. In the sensor error detection method of the display device comprising a sensor unit for measuring the brightness of the backlight and a sensor control unit for controlling the sensor, Measuring the brightness of the backlight by the sensor unit; And And determining, by the sensor controller, whether there is an error in the sensor unit by using a luminance measurement value. The method of claim 11, The determining step, And determining that there is an error in the sensor unit when the luminance measurement value is not input to the sensor control unit. The method of claim 11, The determining step, And determining that there is an error in the sensor unit when a difference between the luminance measurement value and the input luminance value exceeds a threshold value. The method according to claim 12 or 13, And if it is determined that there is an error in the sensor unit, outputting an error signal indicating that there is an error in the sensor unit. The method of claim 14, When the error signal is received, deactivating the sensor unit and the sensor control unit, and indicating that there is an error in the sensor unit; sensor error detection method further comprising. The method of claim 15, The display step, And emitting or flashing a light emitting element indicating that there is an error in the sensor unit, thereby indicating that there is an error in the sensor unit. The method of claim 15, The display step, And displaying a message on the display screen indicating that there is an error in the sensor unit, thereby indicating that there is an error in the sensor unit. The method of claim 11, Outputting a backlight brightness correction value for correcting a difference between the brightness measurement value and the input brightness value when the difference between the brightness measurement value and the input brightness value is equal to or less than a threshold value; Sensor error detection method. The method of claim 18, And correcting the brightness of the backlight according to the received backlight brightness correction value. The method of claim 11, And displaying an error in the sensor controller when the signal is not output for the predetermined time in the sensor controller. The method of claim 11, The sensor unit, Sensor error detection method comprising a luminance sensor or a color sensor. Sensor unit for measuring the brightness of the backlight; And A main controller configured to receive a luminance measurement value of the sensor unit, control the backlight luminance according to the input luminance measurement value, and determine whether an error of the sensor unit is determined using the luminance measurement value; Device.

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