JPH06233206A - Display device - Google Patents

Abstract

PURPOSE:To prevent a display means performing prescribed displays other than a screen from being the eyesore of the screen and to prevent the display of the display means from being difficult to be seen by adjusting the brightness of the display means according to the luminance level of the screen. CONSTITUTION:A fluorescent display tube (CH display) 16 is provided on the lower part of the screen of a CRT 10 and displays the channel number supplied from a selecting station system microcomputer 14. A brightness adjusting circuit 18 adjusts the brightness of the fluorescent display tube, 16 by changing the value of a variable resistance and by changing voltage-E to be supplied to the fluorescent display tube 16 according to brightness control voltage to be supplied from the microcomputer 14. When the brightness control voltage outputted from the microcomputer 14 becomes large, the brightness of the screen of the CRT 10 becomes bright, the absolute value of voltage-E outputted from the brightness adjusting circuit 18 becomes large and the brightness of the fluorescent display tube 16 becomes bright. Therefore, the brightness of the fluorescent display tube 16 can be compatible to the brightness of the screen of the CRT 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a television receiver having a display means such as a fluorescent display tube for displaying a channel or the like outside the screen.

[0002]

2. Description of the Related Art In a conventional television receiver,
Display means including a fluorescent display tube for performing channel display is provided around the screen, for example, at the bottom. The brightness of the display means such as a fluorescent display tube is constant or can be switched by a light control device.

[0003]

When the brightness of the display means such as the fluorescent display tube is constant, for example, when the screen is darkened according to the brightness of the room, the brightness of the display means is relatively high. It becomes very bright and it becomes an eyesore.

Further, even if the brightness of the display means can be switched by the light control device, it does not interlock with the screen, so that it has to be switched according to the brightness of the screen.

The present invention has been made in view of the above circumstances, and provides a display device capable of adjusting the brightness of display means other than the screen for performing a predetermined display to the brightness of the screen. With the goal.

[0006]

A display device according to the present invention comprises a first display means (for example, CRT1 shown in FIG. 1) constituting a screen.
0), second display means (for example, the fluorescent display tube 16 in FIG. 1) that performs a predetermined display (for example, channel display), and control for adjusting the brightness of the second display means according to the brightness level of the screen. Means (for example, the microcomputer 14).

[0007]

In the display device of the present invention, the control means adjusts the brightness of the second display means according to the brightness level of the screen. Therefore, the brightness of the second display means can be adapted to the brightness of the screen.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the display device of the present invention. The tuner 2 receives a television signal. The video signal of the received television signal is intermediate-frequency amplified by the video intermediate-frequency amplifier 4, detected by the video detector 6, amplified by the video amplifier 6, and displayed on the CRT 10.

For example, the input device 12 including a remote controller is
It has a tuning key, a brightness adjustment key, etc., and outputs a command according to a key operation by the user. Tuning system microcomputer 1
4 is a tuner 2 in response to a command from the input device 12.
The channel selection command is output to the fluorescent display tube 16, and the brightness control voltage is output to the video amplifier 8 and the brightness adjusting circuit 18.

The video amplifier 8 adjusts the brightness of the screen of the CRT 10, that is, the brightness according to the brightness control voltage supplied from the microcomputer 14. Fluorescent display tube 16
2 is provided at the bottom of the screen of the CRT 10 as shown in FIG. 2 and displays the channel number supplied from the microcomputer 12. The brightness adjusting circuit 18 is used for the fluorescent display tube 1.
The variable resistance connected to 6 changes the value of the variable resistance according to the brightness control voltage supplied from the microcomputer 14 to change the voltage −E supplied to the fluorescent display tube 16 to perform the fluorescent display. Adjust the brightness of the tube 16.

FIG. 3 shows the relationship between the brightness control voltage output from the microcomputer 14 of the embodiment shown in FIG. 1 and the screen brightness, and FIG. 4 is the brightness output from the microcomputer 14 of the embodiment shown in FIG. 5 shows the relationship between the control voltage and the output voltage −E of the brightness adjusting circuit 18, and FIG. 5 shows the relationship between the output voltage −E of the brightness adjusting circuit 18 and the brightness of the fluorescent display tube 16 in the embodiment of FIG. Indicates. As shown in these figures, when the brightness control voltage output from the microcomputer 14 increases, the brightness of the screen of the CRT 10 increases and the absolute value of the voltage -E output from the brightness adjusting circuit 18 increases. The value becomes large and therefore the brightness of the fluorescent display tube 16 becomes bright. Therefore, the brightness of the fluorescent display tube 16 can be adapted to the brightness of the screen of the CRT 10.

In the embodiment of FIG. 1, when the brightness of the screen of the CRT 10 is changed, the brightness of the fluorescent display tube 16 is always changed, but the brightness of the screen of the CRT 10 is always changed. If the brightness is changed, a feeling of strangeness may occur, or the brightness control circuit of the fluorescent display tube 16 may become complicated and the cost may increase. For example, only when the image quality is switched from the standard to the theater, the CRT 10
The brightness of the fluorescent display tube 16 may be changed according to the screen brightness.

In the embodiment shown in FIG. 1, the fluorescent tube display tube is used as the display means for displaying the channel, but a light emitting diode may be used. 6 and 7
Shows an example of a circuit that adjusts the brightness by changing the duty of the supply voltage instead of changing the supply voltage to the light emitting diode. The anode of the light emitting diode LED,
A bias voltage of + 5V is applied via the resistor R1.
The cathode of the light emitting diode LED is connected to the collector of the transistor Q, and the emitter of the transistor Q is grounded. A pulse width modulated voltage is supplied to the base of the transistor Q. As shown in FIG. 6, if the ON period of the voltage supplied to the transistor Q is lengthened, the light emitting diode LED emits bright light, and as shown in FIG. 7, the voltage supplied to the transistor Q is increased. If the off period of is extended, the light emitting diode LED emits dark light.

FIG. 8 shows the configuration of another embodiment of the display device of the present invention. In this embodiment, in response to the brightness detection signal from the brightness sensor 22, the system microcomputer 24 changes the C
The RT 10 outputs the screen brightness adjusting voltage and the brightness adjusting voltage of the fluorescent display tube 16. Even in this case, the brightness of the fluorescent display tube 16 can be adapted to the brightness of the screen of the CRT 10.

In the above embodiment, the screen of the television receiver is constituted by the CRT.
You may comprise by D.

Further, the present invention is applicable not only to the television receiver but also to various display devices.

[0017]

According to the display device of the present invention, the control means adjusts the brightness of the display means other than the screen for performing a predetermined display according to the brightness level of the screen. Does not obscure the screen or, on the contrary, makes it difficult to see the display of the display means.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a display device of the present invention.

FIG. 2 is a schematic view showing the arrangement position of the fluorescent display tube 16 of the embodiment of FIG.
It is a figure shown in relation to the screen of RT10.

FIG. 3 is a diagram showing a relationship between a brightness control voltage output from a microcomputer 14 of the embodiment shown in FIG. 1 and screen brightness.

4 is a brightness control voltage output from a microcomputer 14 of the embodiment of FIG. 1 and an output voltage of a brightness adjusting circuit 18;
It is a figure which shows the relationship with E.

5 is a diagram showing the relationship between the output voltage −E of the brightness adjustment circuit 18 and the brightness of the fluorescent display tube 16 in the embodiment of FIG.

FIG. 6 is a circuit diagram showing another configuration example of a brightness adjusting circuit, that is, a brightness adjusting circuit, in which a light emitting diode is made to emit bright light.

FIG. 7 is a circuit diagram showing another configuration example of the brightness adjusting circuit, that is, the brightness adjusting circuit, in which the light emitting diode is caused to emit light in the dark.

FIG. 8 is a block diagram showing the configuration of another embodiment of the display device of the present invention.

[Explanation of symbols]

 10 CRT 12 Input device 14 Channel selection system microcomputer 16 Fluorescent display tube 18 Brightness adjustment circuit Q transistor

Claims (4)

[Claims] 1. A first display means for forming a screen, a second display means for performing a predetermined display, and a control means for adjusting the brightness of the second display means according to the brightness level of the screen. A display device characterized by the above. 2. The display device according to claim 1, wherein the control unit adjusts the brightness of the second display unit according to the brightness level designated by the input unit. 3. The display device according to claim 1, wherein the control unit adjusts the brightness of the second display unit according to the brightness level of the screen only when the image quality is switched. 4. The display device according to claim 1, wherein the control unit adjusts the brightness by changing the duty of the voltage applied to the second display unit.