JP2013156443A - Display control device, display device and display control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display control device capable of executing luminance adjustment even when a display device is in ordinary operation.SOLUTION: A display control device is configured to be provided with: a test signal generator; a luminance measurement device; and a controller. The test signal generator generates a luminance adjustment test signal inserted into a video signal for displaying a video on a display panel. The luminance measurement device inputs a video signal output from an imaging device for imaging the video displayed on the display panel and measures luminance of the display panel on the basis of the luminance adjustment test signal contained in the video signal. The controller performs control so as to adjust the luminance of the display panel on the basis of a luminance measurement value output from the luminance measurement device.

Description

  Embodiments described herein relate generally to a display control device, a display device, and a display control method applied to, for example, a large video display device.

  2. Description of the Related Art Conventionally, in a large display device using a display panel in which LED (light emitting diode) elements are arranged (hereinafter sometimes referred to as an LED panel), for example, the uniformity of brightness after LED element aging and repair replacement is improved. The phenomenon that it becomes impossible to occur may occur.

  In the manufacturing process of the display device, brightness adjustment (brightness correction) is performed for each LED module or LED panel by a brightness adjustment method using a camera, a brightness sensor, a color brightness meter, or the like. On the other hand, after being delivered as a product, manual adjustment of the brightness by visual observation of the operator is performed at the site where the display device is installed.

JP 2011-39311 A

  When the LED element deteriorates after product delivery or when the LED module fails and is replaced, it is necessary to adjust the brightness of the display device (or brightness correction). However, normally, brightness adjustment cannot be performed during normal operation of the display device. That is, after the display operation of the display device is stopped, the brightness adjustment is performed again. For this reason, the normal operation of the display device may be hindered.

  Therefore, an object of the present invention is to provide a display control device that can perform brightness adjustment even when the display device is in normal operation.

  According to the present embodiment, the display control apparatus includes a test signal generation unit, a luminance measurement unit, and a display control unit. The test signal generating means generates a brightness adjustment test signal to be inserted into a video signal for displaying a video on a display panel. The luminance measuring unit inputs a video signal output from an imaging unit that captures an image displayed on the display panel, and controls the luminance of the display panel based on the test signal for luminance adjustment included in the video signal. taking measurement. The control means controls the brightness of the display panel to be adjusted based on the brightness measurement value output from the brightness measurement means.

1 is a block diagram for explaining a configuration of a display device according to an embodiment. The block diagram for demonstrating the partial structure of the display control apparatus regarding embodiment. The block diagram for demonstrating the structure of the display control apparatus regarding the modification of embodiment. The flowchart for demonstrating operation | movement of the display control apparatus regarding embodiment.

  Embodiments will be described below with reference to the drawings.

[Configuration of display device]
As shown in FIG. 1, the display apparatus of this embodiment is a large-sized LED display apparatus which has the LED screen 20 which consists of a large-sized LED panel, for example. The LED screen 20 has a configuration in which a large number of LED elements are arranged. The display device includes a display control device 10 that drives and controls each LED element and executes display control of the LED screen 20.

  In the present embodiment, the display control apparatus 10 includes a video / image transmission system 11, a test signal generator 12, a controller 13, a measurement camera 14, a computer 15, and a synchronization signal generator 16.

  The video / image sending system 11 sends a video (or image) signal to be displayed on the LED screen 20 to the controller 13. The controller 13 executes display control for displaying the video (image) on the LED screen 20 based on the video (image) signal received from the video / image transmission system 11.

  Here, the display control device 10 according to the present embodiment includes a function of automatically performing luminance adjustment (or luminance correction) of the display device, as will be described later. In order to realize this function, the controller 13 generates a test video (image) on the LED screen 20 based on a luminance measurement test signal (hereinafter sometimes simply referred to as a test signal) generated from the test signal generator 12. Display control for displaying) is executed. The test signal is, for example, a luminance measurement test signal such as all white, gray scale, or single color signal. The measurement camera 14 captures an image displayed on the LED screen 20 and outputs the image signal to the computer 15.

  The computer 15 executes various data processing necessary for controlling brightness adjustment (brightness correction). Specifically, the computer 15 measures the luminance of the LED panel constituting the LED screen 20 based on the video signal including the test signal (test pattern) output from the measurement camera 14. The computer 15 outputs a control signal for executing brightness adjustment to the controller 13 based on the calculated brightness measurement value. Further, the computer 15 outputs a control signal for starting brightness adjustment at a predetermined timing to the test signal generator 12 and the controller 13 during the operation of the display device.

  The synchronization signal generator 16 supplies the video / image transmission system 11, the test signal generator 12, the controller 13, and the computer 15 with a synchronization signal for synchronization required for normal operation of the display device and brightness adjustment. .

[Brightness adjustment]
Next, the operation of the display control apparatus 10 of this embodiment will be described with reference to the flowcharts of FIGS.

  First, during normal operation of the display device, the controller 13 executes display control of the LED panel based on the video (image) signal received from the video / image transmission system 11. As a result, a video or an image corresponding to the video (image) signal is displayed on the LED screen 20.

  The computer 15 performs brightness adjustment (brightness correction) of the LED panel at a predetermined timing during normal operation of the display device. That is, as shown in FIG. 4, the computer 15 controls the test signal generator 12 to generate a test signal from the test signal generator 12 (step S1).

  Further, the computer 15 controls the controller 13 to insert the test signal from the test signal generator 12 into the video signal from the video / image transmission system 11 to execute display control of the LED panel. Specifically, for example, a test signal is inserted into one frame in 60 frames or 120 frames of a video signal. As a result, a video (image) including the test signal (test pattern) is displayed on the LED screen 20 (step S2).

  Here, as shown in FIG. 2, the measurement camera 14 is prepared so as to capture a video (image) displayed on the LED screen 20 and output the video signal to the computer 15. The computer 15 activates the measurement camera 14, and synchronizes the measurement camera 14 with the test signal of one frame in the video signal to capture the video displayed on the LED screen 20 (step S3). The computer 15 inputs a video signal including a test signal (test pattern) imaged by the measurement camera 14.

  Next, the computer 15 analyzes the test signal included in the video signal input from the measurement camera 14 and measures the luminance (step S4). The computer 15 compares the calculated luminance measurement value with a preset standard value (step S5). If the measured luminance value is equal to or greater than the standard value, the computer 15 ends the process without adjusting the luminance of the LED panel (luminance correction) (NO in step S6).

  On the other hand, if the luminance measurement value is less than the standard value, the computer 15 outputs an instruction to increase the luminance to the standard value to the controller 13 (YES in step S6). In response to an instruction from the computer 15, the controller 13 outputs a display control signal for increasing the brightness of the LED panel to a standard value to the LED screen 20 (step S7).

  As described above, according to the present embodiment, the luminance of the LED panel constituting the LED screen 20 is measured during normal operation of displaying an image on the LED screen 20 based on the video signal from the video / image transmission system 11. In addition, brightness adjustment for adjusting (correcting) the brightness can be performed. Specifically, during the normal operation of the display device, for example, a test signal of one frame is inserted into the video signal from the video / image transmission system 11, and the test signal is analyzed to measure the luminance. Further, based on the luminance measurement result, when the luminance is lower than the standard due to deterioration of the LED element of the LED panel, the luminance adjustment (correction) of the LED panel is performed during normal operation by feedback control to the controller 13. Can be performed.

  Accordingly, the brightness adjustment (correction) of the LED screen 20 can be performed during normal operation of the display device at the site where the display device is installed as a product. Thereby, the uniformity of the brightness of the LED screen 20 can always be maintained without hindering the normal operation of the display device.

  Specifically, in a large LED display device for business use in particular, the luminance of the LED panel decreases due to aging of the LED elements (for example, a 50% decrease in 75,000 hours). By applying this embodiment, it is possible to realize a feedback adjustment function that adjusts the luminance reduced due to aging to a standard level.

[Modification]
FIG. 3 is a block diagram showing a modification of the present embodiment. In addition, about the other structure of the display apparatus of this embodiment shown in FIG. 1, it abbreviate | omits.

  In this modification, the display device according to the present embodiment shown in FIG. 1 has an adjustment terminal 30 in addition to the computer 15 for automatically executing brightness adjustment during normal operation of the display device. The adjustment terminal 30 is a personal computer, for example, and is a device for manually adjusting brightness. Accordingly, when the normal operation of the display device is stopped, the operator can set an instruction for adjusting the luminance to the controller 13 by operating the adjustment terminal 30.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Display control apparatus, 11 ... Image | video / image transmission system, 12 ... Test signal generator,
13 ... Controller, 14 ... Camera for measurement, 15 ... Computer,
16 ... Synchronization signal generator, 20 ... LED screen (LED panel),
30 ... Adjustment terminal.

Claims (10)

Test signal generating means for generating a brightness adjustment test signal to be inserted into a video signal for displaying video on a display panel;
A luminance measuring unit that inputs a video signal output from an imaging unit that captures an image displayed on the display panel and measures the luminance of the display panel based on the luminance adjustment test signal included in the video signal; ,
A display control apparatus comprising: control means for controlling the brightness of the display panel based on the brightness measurement value output from the brightness measuring means. The luminance measuring means includes
Input a video signal including the brightness adjustment test signal output from the imaging means,
The display control apparatus according to claim 1, wherein the brightness measurement value is calculated by analyzing the brightness adjustment test signal. The control means includes
Compare the brightness measurement value output from the brightness measurement means with a preset standard value,
3. The display control device according to claim 1, wherein the display control device controls the brightness of the display panel to be the standard value based on the comparison result. 4. Means for outputting a video signal sent from the video sending means to the display panel;
4. The display control according to claim 1, further comprising: a unit that inserts the brightness adjustment test signal generated from the test signal generation unit into a video signal transmitted from the video transmission unit. 5. apparatus.   The display control apparatus according to claim 1, further comprising a unit that adjusts luminance of the display panel in accordance with control of the control unit. A display panel for displaying images,
Video transmission means for transmitting a video signal for displaying video on the display panel;
Test signal generating means for generating a brightness adjustment test signal;
Means for inserting the brightness adjustment test signal into the video signal sent from the video sending means;
Display control means for controlling to adjust the brightness of the display panel,
The display control means includes
A luminance measuring unit that inputs a video signal output from an imaging unit that captures an image displayed on the display panel and measures the luminance of the display panel based on the luminance adjustment test signal included in the video signal; ,
And a brightness control means for adjusting the brightness of the display panel based on the brightness measurement value output from the brightness measurement means. The brightness control means includes
Compare the brightness measurement value output from the brightness measurement means with a preset standard value,
The display device according to claim 6, wherein brightness of the display panel is controlled to be the standard value based on the comparison result. The display control means includes
Means for displaying a video on the display panel with a video signal into which the test signal for brightness adjustment is inserted;
The display device according to claim 6, further comprising a unit that adjusts the luminance of the display panel in accordance with the control of the luminance control unit. A display control method applied to a display device having a display panel for displaying video,
Processing for inserting a brightness adjustment test signal into a video signal for displaying video on the display panel;
A process of inputting a video signal from an imaging means for imaging the video displayed on the display panel;
Processing for measuring the luminance of the display panel based on the luminance adjustment test signal included in the input video signal;
And a process of adjusting the brightness of the display panel based on the measured brightness measurement value. The adjustment process is
Compare the brightness measurement value with a preset standard value,
The display control method according to claim 9, wherein the display panel is adjusted so that a luminance of the display panel becomes the standard value based on the comparison result.

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