JP2009182392A - Liquid crystal television receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal television receiver which displays a picture with the most suitable picture quality according to the height of a display surface, namely, a viewer's sight line. <P>SOLUTION: The liquid crystal television receiver includes: a detection means 9 including a distance measuring means 5 for measuring a distance from a prescribed position of the liquid crystal television receiver to a floor surface at an angle to a perpendicular direction and a height calculation means 6 for calculating the height from the floor surface to the display surface on the basis of the measurement result of the distance measuring means 5 and the angle; and a control means 7 for switching the picture quality in accordance with the height. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal television receiver.

  The liquid crystal television receiver is best viewed from the front in terms of image quality. For example, in an exhibition at a store, it is often installed at a low or high position from the viewer's perspective.

  When the liquid crystal display device is displayed at a low position or a high position from the viewpoint, there is a problem that a contrast ratio is deteriorated due to a problem of a viewing angle. This is particularly remarkable in a TN (twisted nematic) liquid crystal display device.

  In Patent Document 1, by determining the type of a conditional access system (CAS) card inserted in the receiving device, if it is a storefront display, the image quality and sound quality suitable for bright and wide locations in the storefront are automatically set. There has been proposed a television receiver that automatically sets.

JP 2007-288432 A

  However, in the method described in the above document, it is possible to detect that the place of use is a storefront by determining the type of CAS card, but it is not possible to detect where the television receiver is installed in the storefront. Therefore, for example, when a liquid crystal television receiver is installed at the top of the display shelf, the video display surface becomes higher from the user's line of sight, and the display screen is looked up. There was a problem that was damaged.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystal television receiver that displays an optimum image quality according to the height of the video display surface.

  The liquid crystal television receiver of the present invention is configured to include detection means for detecting the height from the floor surface to the display surface, and control means for switching the image quality according to the height.

  The liquid crystal television receiver of the present invention detects the height of the display surface from the floor surface and sets an appropriate image quality based on the height, so that the best image quality according to the viewer's line of sight is displayed. It is possible.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

(Constitution)
FIG. 1 is a diagram showing the configuration of a liquid crystal television receiver 10 according to the present invention. The liquid crystal television receiver 10 includes a liquid crystal display panel (not shown) having a display surface 2 and a housing 9 that accommodates the liquid crystal display panel so that the display surface 2 is exposed. A stand 3 is installed at the bottom of the housing 9.

  Further, a distance sensor 1 for measuring a distance from an object with ultrasonic waves is attached to the upper front portion of the housing 9 facing downward. The distance sensor 1 can measure the distance from an object by emitting an ultrasonic wave and measuring the time until the reflected wave returns.

  FIG. 2 is a configuration diagram of a processing unit installed in the liquid crystal television receiver 10 according to the present invention, and includes the distance sensor 1 and the distance from the position of the distance sensor 1 to the floor surface at a certain angle with respect to the vertical direction. The distance measurement means 5 for measuring the height, the height calculation means 6 for calculating the height from the floor surface to the display surface 2 based on the measurement result of the distance measurement means 5 and the angle described above, and the calculation result of the height calculation means 6 The control unit 7 controls the image quality based on the height from the floor surface to the display surface 2, and the image receiving circuit 8 for receiving the image quality controlled by the control unit 7 on the liquid crystal display panel. . The distance measuring means 5 and the height calculating means 6 are combined to form a detecting means 11 for detecting the height from the floor surface to the display surface.

(Operation)
Next, the operation of the liquid crystal television receiver will be described.

  FIG. 3 is a side view of a state in which the liquid crystal television receiver 10 of the present invention is installed. The display surface 2 is installed in a substantially vertical direction. The ultrasonic wave emission angle of the distance sensor 1 with respect to the display surface 2 of the liquid crystal television receiver 10, that is, the vertical direction is θ, the distance from the distance sensor 1 to the floor surface 4 in the ultrasonic wave emission direction is A, and the liquid crystal television reception The height of the main body of the apparatus 10 is B, and the height from the floor 4 to the lower end of the liquid crystal television receiver 10 is C.

  In the height calculation means 6 shown in FIG. 3, the ultrasonic emission angle θ described above and the height B of the liquid crystal television receiver 10 main body are stored in advance. The distance measuring means 5 measures the distance A from the distance sensor 1 to the floor surface 4 using the distance sensor 1. In the height calculation means 6, from the floor surface 4 to the stand 3 of the liquid crystal television receiver 10 based on the distance A measured by the distance measurement means 5, the ultrasonic emission angle θ, and the height B of the main body of the liquid crystal television receiver 10. The height C is calculated. That is, it can be obtained by equation (1). Therefore, the height D from the floor surface 4 to the center of the display surface 2 can be obtained by Expression (2).

C = A cos θ−B (1)
D = C + (1/2) B (2)

  The control means 7 sets the optimum image quality based on the result obtained by the height calculation means 6, that is, the height D from the floor surface 4 to the center of the display surface 2. For example, in a storefront display, the liquid crystal television receiver 10 installed on an exhibition shelf higher than the viewer's line of sight, or conversely lower than the viewer's line of sight, is viewed from the viewer's perspective. Due to this problem, the contrast ratio is deteriorated.

  Therefore, when it is detected that the position is higher or lower than the viewer's line of sight, settings that automatically improve the contrast ratio, such as changing the gamma correction coefficient of the liquid crystal display panel, etc. And output to the image receiving circuit 8. In this way, the image receiving circuit 8 causes the liquid crystal display panel to receive the best image quality according to the installation height of the liquid crystal television receiver 10.

(effect)
The liquid crystal television receiver 10 of the present invention detects the center height of the display surface 2 from the floor surface 4 and sets an appropriate image quality based on the height, so that the best according to the viewer's eyes Can be displayed.

It is a figure which shows the structure of the liquid crystal television receiver which concerns on this invention. It is a figure which shows the structure of the process part of the liquid crystal television receiver which concerns on this invention. It is a figure explaining operation | movement of the liquid crystal television receiver which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Distance sensor, 2 Display surface, 3 Stand, 4 Floor surface, 5 Distance measuring means, 6 Height calculation means, 7 Control means, 8 Image receiving circuit, 9 Case, 10 Liquid crystal television receiver, 11 Detection means.

Claims (2)

Detection means for detecting the height from the floor surface to the display surface;
Control means for switching the image quality according to the height;
A liquid crystal television receiver comprising: The detection means includes
Distance measuring means for measuring a distance from the predetermined position of the liquid crystal television receiver to the floor surface at a certain angle with respect to a vertical direction;
A height calculation means for calculating a height from the floor surface to the display surface based on the measurement result of the distance measurement means and the angle;
The liquid crystal television receiver according to claim 1.

Images