JP5240878B2 - Display device and display method - Google Patents

Description

  The present invention relates to a display device including a sensor for measuring chromaticity or luminance of a display panel, and a display method.

Conventionally, in the case of a display device having a viewing angle dependency such as a liquid crystal monitor, it has been described in the following patent document as a method for obtaining an optimum image quality of color and brightness corresponding to the angle of the viewer viewing the screen. There is technology.
In this technique, an LUT (Look up Table) is used to select an image quality correction matrix according to the angle at which the viewer views the screen of the display device, and the image is corrected using the selected image quality correction matrix. Thereby, image quality correction according to the position of the viewer can be performed.
JP 2006-276692 A

However, the above technique has the following problems.
The first problem is that an LUT for image quality correction is provided in advance at the time of factory shipment, and an image quality correction matrix is selected according to the viewer's angle by referring to this LUT. For this reason, in order to perform optimum image quality correction, it is necessary to perform a complicated calculation in order to obtain an enormous number of LUTs and interpolation coefficients in order to cope with various viewing angles.
The second problem is that the image quality correction LUT at the time of shipment from the factory is used as a reference in advance, so feedback regarding whether or not the image quality correction actually viewed from the front of the screen is correct is not made. Therefore, for example, in practice, there is a problem that it cannot follow changes in luminance and color due to temperature changes in the liquid crystal panel of the display device.
The third problem is that the brightness and color of display devices such as liquid crystal panels change over time, so if the LUT of the initial data at the time of factory shipment is used for a long time, it can cope with changes in luminance and color. Therefore, the actual luminance and color correction are misaligned.

  In order to solve the above-described problems, the present invention provides a display device and a display method that correct an image according to the angle of a viewer without using an LUT.

  In order to solve the above-described problem, the present invention provides a first sensor that detects at least one of chromaticity or luminance of a display panel included in a display device, and viewing angle information that represents a viewing angle of a user with respect to the display panel. An input unit that receives an input and an angle control unit that changes an angle of the first sensor with respect to the display panel according to viewing angle information input from the input unit.

  In the display device described above, the present invention includes a second sensor that detects a viewing angle of the user with respect to the display panel, and the input unit receives an input of a detection result of the second sensor. To do.

  In the present invention, the input unit accepts input of viewing angle information representing a viewing angle of the user with respect to the display panel included in the display device, and the sensor detects at least one of chromaticity or luminance of the display panel, A control part changes the angle of the 1st sensor with respect to the said display panel according to the viewing angle information input from the said input part, It is characterized by the above-mentioned.

  As described above, the viewing angle correction apparatus according to the present invention includes the first sensor (front sensor) that senses the movable color and brightness disposed in the front portion of the display device, and the viewing angle of the viewer with respect to the display device. The angle of the first sensor is moved so as to follow the viewing angle detected by the second sensor for detecting the brightness, the luminance or chromaticity of the display device is measured, and the viewing angle is corrected.

According to the present invention, viewing angle information representing the viewing angle of the viewer is obtained, and the detection angle of the first sensor that detects chromaticity or luminance is changed according to the viewing angle information.
The first effect thus obtained is that the first sensor can be adjusted to the actual viewing angle of the viewer by making the first sensor movable, and the chromaticity of the display panel at the viewing angle of the viewer, The brightness can be detected. As a result, chromaticity and luminance can be corrected according to the viewing angle of the viewer, and the angle dependence can be reduced for the viewer.
The second effect is that an LUT stored in advance at the time of shipment from the factory is no longer necessary, and brightness and chromaticity can be corrected in real time.
The third effect is that even when the display monitor panel or lamp changes over time, it can be measured by the first sensor and corrected according to the actually displayed chromaticity and luminance. became.

It is a schematic block diagram which shows the structure of the display apparatus in embodiment of this invention. 2 is a flowchart for explaining the operation of the display device in the configuration of FIG. 1. It is a block diagram which shows the structure of a drive part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front sensor 2 Display panel 3 Color / brightness detection part 4 Color / brightness correction part 5 Video signal generation part 6 Viewer position detection sensor 7 Position detection part 8 Viewing angle detection part 9 Angle control part

  FIG. 1 is a schematic block diagram illustrating a configuration of a display device according to an embodiment of the present invention. In this figure, a front sensor 1 is disposed on the front surface (display surface) of a display panel 2 of a display device such as a television or a monitor, and is at least one of chromaticity and luminance of the display panel 2 on which a video signal is displayed. One is detected. Here, both chromaticity and luminance are detected. Further, the front sensor 1 has a drive unit that changes a detection angle with respect to the display panel 2 in accordance with a control signal output from an angle control unit 9 described later. For example, as shown in FIG. 3, the driving unit is disposed in a bezel unit 20 on the entire surface side of the display panel 2. In FIG. 3, as an example, the display panel 2 is disposed on the bezel portion 20 on the upper surface side. The bezel portion 20 is provided with a rotation drive motor 21. A color / luminance detection sensor 22 is provided at the tip of the drive shaft of the rotary drive motor 21 such that a detectable region faces the display panel 2. When the rotational drive motor 21 is driven, the angle detected by the color / luminance detection sensor 22 with respect to the display panel 2 changes, for example, in the left-right direction.

  The display panel 2 displays various video signals. The display panel 2 is, for example, a liquid crystal panel, and has a characteristic that a visible color or luminance differs depending on a viewing angle. The viewing angle here is an angle at which the viewer is positioned with respect to the display panel. The color / brightness detection unit 3 receives an analog detection signal output from the front sensor 1, converts it into a digital detection signal, and outputs it to the color / brightness correction unit 4. The color / luminance correction unit 4 corrects the chromaticity and luminance of the video signal output from the video signal generation unit 5 and outputs the corrected video signal to the display panel 2. The video signal generation unit 5 generates various video signals and outputs the generated video signals to the color / luminance correction unit 4.

  The viewer position detection sensor 6 is provided in the display device and detects the position of the viewer. The viewer position detection sensor 6 uses various known detection functions such as an infrared sensor, an ultrasonic sensor, a light emission position detection from a remote controller, a face detection function employed in a digital camera, etc. To detect the viewing angle. Using a method using a CCD (Charge Coupled Device) camera or the like, or using a face recognition function of a digital camera, the face of the viewer can be recognized, and the position of the recognized face can be detected as the position of the viewer.

  Here, in addition to using the above-described various sensors as the viewer position detection sensor 6, the viewer may input a viewing angle by pressing an operation button provided on a remote controller such as a television or a monitor. . Here, when the operation button is pressed and the light emitting unit of the remote controller emits light, the display device receives this light, and the position of the received light can be specified, whereby the position of the viewer can be specified.

  The position detection unit 7 obtains the detection result of the viewer position output from the viewer position detection sensor 6, identifies the viewer position, and represents the angle with respect to the display panel 2 at the viewer position from the identification result. Generate a signal. The viewing angle detection unit 8 determines the viewing angle based on the confirmed viewing angle position of the viewer output from the position detection unit 7. That is, the angle corresponding to the case where the viewer moves or the case where there are a plurality of viewers is determined. The viewing angle position here is the position of the viewer at that time. The angle control unit 9 generates a control signal indicating the sensor angle of the front sensor 1 and outputs the control signal to the front sensor 1.

Next, the operation of the display device in the configuration of FIG. 1 described above will be described with reference to the flowchart of FIG.
The viewer position detection sensor 6 detects the viewer's viewing position and outputs a detection signal representing the detection result (step S1). Here, the viewer may press the operation button to notify the display device of his / her viewing position.
When the detection signal is output from the viewer position detection sensor 6, the position detection unit 7 detects the angle between the viewer position and the display device represented by the detection signal, and the detected angle is the viewing angle representing the viewer viewing angle. It converts into a signal and outputs it to the visual angle detection part 8 (step S2).

  The viewing angle detection unit 8 determines the viewing angle position based on the viewing angle signal output from the position detection unit 7. This viewing angle position is determined according to, for example, hysteresis with respect to a viewer position that changes with time, or according to a preset priority that indicates which viewer is prioritized when viewed by a plurality of viewers. , Detecting the position of a viewer with high priority, or determining the average of the positions of a plurality of viewers (for example, the center of gravity obtained by calculating the average of the coordinate values corresponding to the positions of each viewer) The obtained result is determined as the viewing angle position (step S3).

  When the viewing angle position is determined, the angle control unit 9 outputs to the front sensor 1 an angle control signal for controlling the angle of the front sensor 1 with respect to the liquid crystal panel 2 so that the angle corresponds to the viewing angle position (step S4). ). The front sensor 1 changes the angle according to the angle control signal output from the angle control unit 9 (step S5). Here, the rotation drive motor 21 is driven in accordance with an instruction from the angle control unit 9 to change the direction of the detection direction of the color / luminance detection sensor 22.

  Here, the display in the area where the display panel 2 and the front sensor 1 overlap is different from the video signal input from the outside (video signal generation unit 5), and each color (R, G, B) generated inside the display device. Alternatively, the gamma characteristic of the front sensor 1 is measured by displaying white, which is a combination of the luminescent colors, displaying the displayed color in order from low gradation to high gradation, and measuring at each gradation. The color / brightness detection unit 3 receives an analog detection signal representing the measurement result output from the front sensor 1, converts the analog detection signal into a digital detection signal, and outputs the digital detection signal to the color / brightness conversion unit 4. . The color / luminance correction unit 4 corrects the original luminance and color output from the detection result output from the color / luminance detection unit 3 (step S6). For example, when the original gamma characteristic is 2.2 and the color / brightness detection unit 4 obtains a detection result deviating from gamma 2.2 from the color / brightness detection unit 3, the video signal generation unit 5 Is corrected to normal gamma 2.2 and output to the display panel 2.

  Thereafter, the process proceeds to step S1 until the power-off or termination instruction is input, and the process up to step S6 is repeated (step S7).

  The color and luminance of the display device can be corrected according to the position of the viewer with respect to the display device.

Claims (3)

A first sensor that detects at least one of chromaticity and luminance of a display panel included in the display device;
An input unit that receives input of viewing angle information representing a viewing angle of the user with respect to the display panel;
An angle control unit that changes an angle of the first sensor with respect to the display panel according to viewing angle information input from the input unit;
A display device comprising: A second sensor for detecting a viewing angle of the user with respect to the display panel;
The display device according to claim 1, wherein the input unit receives an input of a detection result of the second sensor. The input unit accepts input of viewing angle information representing the viewing angle of the user with respect to the display panel included in the display device,
A sensor detects at least one of chromaticity or luminance of the display panel;
A display method, wherein the angle control unit changes the angle of the first sensor with respect to the display panel in accordance with viewing angle information input from the input unit.

Images