JPH04192762A - Color television receiver - Google Patents

Abstract

PURPOSE:To simplify the operation of an audience and to obtain an optimum screen all time by providing a receiver main unit or an attached remote control transmitter with an infrared ray type or ultrasonic type distance sensor, and a means properly actuating a video regulation means corresponding to the distance detected by the sensor. CONSTITUTION:When the location of an audience 4 a position 4a, an infrared light emitted by an infrared light LED2 is increased in its directivity and reflected by the audience at the position 4a. The reflected infrared light is converted into a spot shape when it passes through a light collecting lens 6 and is made incident to a 01 point of a one-dimensional PSD3. Similarly, when the location of the audience 4 is a position 4b, the emitted infrared light is made incident to a 02 voltage. A light current outputs 11 and 12 can recognize a distance between a screen and the audience through a microcomputer 12 when the a voltage value corresponding to a distance is obtained from an operation circuit and a current/voltage conversion circuit. Then thus, brightness, color density and image quality can be set to an optimum value, respectively, by the microcomputer 12 corresponding to the distance between the screen and the audience.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color television receiver, and more particularly to a color television receiver configured to adjust an image on a screen.

[Conventional technology]

Traditionally, in order to adjust the image on a color television screen according to the image content and preferences, the viewer had to directly adjust the brightness, color density, image quality, etc. with separate volume controls on the receiver body. It was operated by hand.

In addition, as screens become larger, it becomes difficult to get close to adjust the screen, so color television receivers have become popular in recent years, making it possible to easily control the image using a remote control transmitter even at a distance from the screen. It is becoming mainstream.

This is done by a microcomputer or microcontroller (hereinafter referred to as microcontroller) built into the receiver body receiving commands sent from the remote control transmitter and changing the DC voltage via a D/A converter. It is configured to electronically control the image in place of the conventional mechanical volume.

In general, images on large-screen color television receivers are adjusted so that the closer they get to the screen, the lower the brightness and color saturation.This reduces the irritation to the viewer's eyes, lowers the image quality, and makes the screen less grainy. It is preferable to perform so-called soft screen adjustments that suppress glare. Also,
On the other hand, it is preferable to increase brightness and color saturation to increase contrast and improve image quality as you move away from the screen to create a clearer, so-called sharp screen.

FIG. 4 shows a schematic configuration of a conventional color television receiver that embodies this, and is called viewing distance control.

In the figure, (1) is the receiver body, which includes a remote control receiver (9) and a microcomputer (12).

(4) is a viewer, and (7) is a remote control transmitter attached to the receiver body (1), which is operated by the viewer.

(8) is a transmitter such as an infrared LED that transmits a remote control code, (9) is the above-mentioned remote control receiver, and (10).

(11) is a perspective button for viewing distance control.

Next, the operation of the color television receiver having the above configuration will be explained.

When the viewer (4) presses the far button (1o) or near button (11) of the viewing distance control on the remote control transmitter (7) side, the corresponding remote control code is activated and the transmitter (7) of the remote control transmitter (7) is activated. 8), and the receiver (9) built into the receiver body (7) receives the remote control code.

When the remote control receiver (9) receives the above instruction code, it is decoded by the microcomputer (12) built into the receiver body (7), and if the input is made using the far button (10), the brightness, color density, and image quality are determined. etc. are stepped up by a preset numerical value, and conversely, brightness, color depth, image quality, etc. are similarly stepped down if input is made using the near button (11).

FIG. 5 is a schematic flowchart of the operation by the microcomputer (12), in which the step of determining the presence or absence of key human power (
SL), steps (S2) and (S3) for determining whether it is a far button input or a near button input, a step (s4) for performing a step up in the case of a far button input, and a step (s4) for performing a step down in the case of a near button input. S5).

The operating range of such viewing distance control is divided into several steps in advance depending on the distance between the screen and the viewer, and the range of operation within the operating range is divided according to the number of times the viewing distance button is pressed. It is set to - somewhere. This position is displayed on-screen on the television screen so that viewers can see which position they have set.

[Invention or problem to be solved]

Conventional color television receivers are configured as shown below, so in the case of viewing distance control, the viewer must operate the keys on the remote control transmitter depending on the distance from the screen. In addition, since video adjustments such as image quality are manually set by the viewer, there was a problem that the screen was not always set to the optimal setting depending on the distance.

This invention was made to solve the above-mentioned problems, and it is possible to automatically adjust the image quality to always be optimal based on the positional relationship between the screen and the viewer, without requiring any operation by the viewer. The purpose is to provide a color television receiver that can.

[Means to solve the problem]

The color television receiver according to the present invention is configured such that an infrared or ultrasonic distance sensor is provided on the receiver body or an attached remote control transmitter, and the image is adjusted according to the detected distance by this sensor. Features.

[Effect]

According to this invention, a distance sensor built into the receiver body or an attached remote control transmitter automatically detects the positional relationship between the television screen and the viewer, that is, the relative distance;
Depending on the detection distance, the image quality can be automatically adjusted to the optimum image quality for viewing.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a color television receiver according to an embodiment of the present invention, and FIG. 2 is a detailed diagram of FIG. 1 for explaining the principle.

In the figure, (1) is the receiver body, (2) is the infrared LE
D is the transmitter, (3) is the distance sensor, and in this example,
-dimensional semiconductor device detection element (PositionSens
With itive Light Detector, below,
(referred to as PSD). (12) is a microcontroller,
It is built into the receiver body (1).

(4) is the viewer of this television, and (4a) in Figure 2
), (4b), and (4c) are located at different locations. (5) is a light projecting lens placed in front of the transmitter (2), and (6) is a condensing lens placed in front of PSD (3).

Next, the operation of the above configuration will be explained.

When the viewer (4) is at the position (4a) in Figure 2, the infrared light emitted from the infrared LED (2) becomes directional by passing through the projection lens (5). is enhanced, (4
It is reflected by the viewer (4) at position a). This reflected infrared light passes through the condensing lens (6), becomes more spot-like, and enters the old point of -dimensional PSD (3).

Similarly, when the viewer (4) is at the position (4b) in FIG. 2, the projected infrared light is incident on point 02 of the one-dimensional PSD (3).

The above-mentioned -dimensional PSD (3) is a pair of output electrodes at both ends.

(2) It is a position detection element whose current value changes depending on the distance from the incident point 01.02 of the spot light.

In Fig. 2, the incident point 01 and the one-dimensional P S D (3
) The relationship between the current obtained from electrode ■ is as shown in the following equation.

L However, Tl Current at electrode I, ■2: Current at electrode ■, I0: Total current (11+I2), L: Length between electrodes (light-receiving surface length), Xl: Infrared light from electrode I The distance to the point of incidence O1, therefore, the point of incidence of infrared light O1, is determined by the following calculation.

To use the I2 xi 11+I2 L -dimensional PSD to act as a distance sensor, the principle of triangulation is used. FIG. 2 also explains this principle.

That is, the range of distance to be measured is 11 to 12,
Assuming that the distance between the optical axes of the light projecting lens and the condensing lens is B, and the distance between the condensing lens and the PSD light receiving surface is f, the infrared light when the viewer is at position (4a) is The distance X1 between the point of incidence 01 and the electrode ■ and the distance X2 between the point of incidence of infrared light 02 and the electrode ■ when the viewer is at position (4b) are expressed by the following equations.

xl=(B-f/jl'l), x2=(B-f/A2)
From these relational expressions, the relationship between the photocurrent value due to the spot light obtained at the positions of xi and x2 and the distance of 111.112 is as follows: IOL L-j71 12 xi B-f II L L-A2 I2 x2 B-f Therefore, a relational expression proportional to distance can be obtained.

In this invention, instead of actually measuring the distance, it is sufficient to know the approximate relationship between the distance between the screen and the viewer, and accuracy is not required. This photocurrent output If, I2 is used to obtain a voltage value corresponding to the distance using an arithmetic circuit and a current-voltage converter circuit, and is then sent to a microcomputer (12) built into the receiver body (1). ) can be used to determine the distance relationship between the screen and the viewer. Thereafter, the microcomputer (12) sets the brightness, color density, and image quality to optimal values depending on the distance between the screen and the viewer.

In addition, in the above embodiment, the viewer (4) is the receiver body (
1), and there is no obstruction between the screen and the viewer (4). In the case of multiple viewers, the video may be adjusted to the optimal screen for the person operating the remote control transmitter.

For example, as shown in FIG. 3, a remote control transmitter (7) has an infrared LED (2) and a distance sensor (3) built-in. In 4), if the person in position (4a) has the remote control transmitter (7), then calculate the distance between the viewer (4) in position (4a) and the receiver body (1). It is automatically detected and the detected data is transmitted to the receiver body (1) using another infrared LED. The distance detection and screen image adjustment described above are performed in the same manner as in the above embodiment.

In addition, in the embodiment described above, infrared LED and one-dimensional P
Distance detection may be performed using SD, or other means may be used, such as ultrasound, for example.

〔Effect of the invention〕

As described above, according to the present invention, the distance between the screen and the viewer is automatically detected using a distance sensor, and the image is adjusted adaptively according to the detected distance. Therefore, the operation for the viewer can be simplified and the optimum screen can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a color television receiver according to one embodiment of the present invention, FIG. 2 is a diagram illustrating details and principles of the distance sensor section, and FIG. 3 is another embodiment of the present invention. A schematic diagram showing the configuration, No. 1! Viewing (1)...Receiver body, (2)...Infrared LED, (
3)...Distance sensor, (4)...Viewer, (12)...
...Microcomputer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a color television receiver that is equipped with image adjustment means including brightness, color density, and image quality via a D/A converter in the receiver body, infrared rays are sent to the receiver body or the attached remote control transmitter. Alternatively, a color television receiver comprising an ultrasonic distance sensor and means for adaptively operating the image adjusting means according to the distance detected by the sensor.