JPS63318593A - Illumination control circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit that allows illumination using a television receiver to be controlled by a remote control transmitter.

[Conventional technology]

An illumination display circuit using a television receiver is
A video switching circuit is provided before the video output of the television receiver, and this circuit is configured to put an illumination signal on the video signal line and display it, but the illumination signal is created using a color difference signal or RGB signal.
This method changes the level of the primary color signal, and a joystick or the like was used to continuously change the level.

[Problem that the invention seeks to solve]

Therefore, if this illumination display was to be controlled by a remote control transmitter, it would be necessary to equip the remote control transmitter with a joystick or something equivalent, which was difficult to realize.

The present invention is to enable illumination to be controlled with a remote control transmitter.

[Means for solving problems]

The present invention provides a circuit that includes separate D/A converters for RGB and sends signals from each of the D/A converters as illumination signals to a video output circuit, the circuit including: , R-l C1sinθ+Y B=lClcos θ+Y G=-0,51R-0,19B +1.6Y Send RGB data expressed by the formula, and among θ, C, and Y in the formula,
It is configured to uniformly change at least the value of θ.

〔Example〕

Examples of the present invention will be described below. FIG. 1 shows a circuit showing one embodiment of this circuit, which is applied to a case where illumination is performed as a background of an analog clock display. 1 is an analog clock display control circuit, which is composed of a memory that stores analog clock display data in advance, a VDP (video display processor), etc. that controls the memory and reads out the data, and has primary color signals RGB and a display on its output side. An impose switching signal Ys and a blanking signal BLK are output.

2 is a high-speed changeover switch circuit for screen imposition;
The analog clock display signal from the analog clock display circuit 1 and the illumination primary color signal RGB from the illumination control circuit 3, which will be described later, are switched by the above-mentioned switching signal Ys. The output of this switch circuit 2 is then supplied to the cathode of the CRT via the video output circuit.

The illumination control circuit 3 includes three D/A converters 3.
1 to 33, in which RG from photoamplifier 4
B digital data is converted to an analog signal. D/A
The power to the conversion circuits 31 to 33 is supplied with Vcc, and when the grazing pulse arrives, the transistor Q1 becomes conductive and the power supply is stopped.

In this embodiment, the RGB signals for illumination are calculated as follows, and the data is sent to the control circuit 3.

RY=|C|sin θ・(1)B
Y=lClcos θ...(
2) G −Y = −0,51(RY) −0,91
(B-Y)...(3). Here, C is the saturation expressed by the vector length in FIG. 2, and θ is the hue.

R is a red signal, B is a blue signal, G is a green signal, and Y is a luminance signal.

Therefore, from these equations (1) to (3), R=|C|sin θ+Y ・(4
)B=lClcos θ+Y...(5)C,=-0,
51(R4) -0,91(B-Y) -Y=-0,5
1R-0,19B +1.6Y...(
6) Can be hatched. In other words, the RGB signal can be changed by the three elements θ, C, and Y. This θ is a tint adjustment, C is a saturation adjustment, and Y is a brightness adjustment.

Therefore, as shown in FIG. 3, the remote control transmitter 10 has an up key 11, a down key 12, and
It is sufficient to provide an up key 13 and a down key 14 for C (saturation), and an up key and a down key 15 for Y (bright). Alternatively, as shown in the remote control transmitter 20 in FIG. 4, it is also possible to use only a toggle-operated mode switching key 21 that switches from tint to saturation to bright to tint each time it is pressed, an up key 22, and a down key 23. .

Reference numerals 24 to 26 in FIG. 4 are mode display lamps.

Then, as described above, the remote control transmitter 10 or 2
The data of θ, C, and Y set by
4) to (6) are performed, and the RGB of the calculation result is
Each data is converted into an analog signal by the D/A converters 31 to 33 of the control circuit 3 except for the blanking period, and is output to the switch circuit 2.

〔Effect of the invention〕

As described above, according to the present invention, since it is sufficient to adjust at least 0 data, illumination control can also be performed using a remote control transmitter.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an illumination control circuit and its peripheral circuits according to an embodiment of the present invention, Fig. 2 is a diagram for explaining colors, and Figs. 3 and 4 are part of a remote control transmitter. FIG. Agent Patent Attorney Tsuneaki Nagao Figure 1

Claims (2)

[Claims] (1) A separate D/A converter for RGB is provided for each D/A converter.
A circuit that sends the signal from the /A converter as an illumination signal to the video output circuit, and sends the signal to each D/A converter as follows: R=|C|sinθ+Y B=|C|cosθ+Y G=-0.51R- Send RGB data expressed by the formula 0.19B+1.6Y, and θ, C in the formula
, Y, at least the value of θ is uniformly changed. However, R is a red signal, B is a blue signal, G is a green signal, Y is luminance data, C is saturation data, and θ is hue data. (2) The output of each of the D/A converters is sent to the video output circuit via a high-speed switch circuit that switches with other RGB signals. The illumination control circuit according to item 1.