JP2595500B2 - Reception mode display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention receives VHF and UHF broadcasts,
The present invention relates to a reception mode display function of a reception device having a plurality of reception modes, such as a portable color television having a radio capable of receiving a band.

[Prior art of the invention and its problems] In recent years, a portable color television employing a liquid crystal (LC) or an ultra-small CRT has been put to practical use. Such portable color televisions often receive UHF and VHF and also have AM and FM radios. But,
Since the switches that switch these modes are small, it is difficult to determine whether the mode selection is UHF, VHF, AM, or FM. For this reason, if you tuned for VHF, you would often find that you couldn't find the desired station and that it was actually UHF.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a receiving apparatus which has a plurality of receiving modes, such as a portable color television, and has a receiving mode which is previously received when the power is turned on. It is an object of the present invention to provide a reception mode display device which reads out a color and displays a color corresponding to the reception mode on a screen for a predetermined period from a power-on operation.

[Summary of the Invention] In a portable television or the like having a plurality of reception modes, the previous reception mode is stored, and when the power is turned on, the previous reception mode is read out. The display color corresponding to the mode is displayed on the screen so that the previous reception mode can be confirmed by the color.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a portable color television provided with an AM / FM radio. In the figure, reference numeral 11 denotes a radio tuner, which selects a radio wave of a desired channel from AM / FM waves received by an antenna 10 according to the support of a tuning control circuit 12, converts the radio wave into an intermediate frequency, and outputs the intermediate frequency to a radio circuit 13. I do. The radio circuit 13 detects and amplifies the input signal and outputs an audio signal to the speaker 14. Further, the radio circuit 13 generates a tuning signal based on a signal from the radio tuner 11 and outputs the signal to the tuning control circuit 12.

Reference numeral 15 denotes a TV tuner, which selects a broadcast wave of a desired channel from television broadcast waves induced by the antenna 10 according to the support of the tuning control circuit 12, converts the broadcast wave into an intermediate frequency, and outputs the intermediate frequency to the TV circuit 16. This TV circuit 16
After amplifying the TV signal sent from tuner 15,
Processing such as video detection, synchronization separation, audio detection, and color signal reproduction is performed. The horizontal synchronizing signal is output from the TV circuit 16.
Vs and the vertical synchronization signal Hs are output to the timing control circuit 17, and various timing signals Φv, Φh, Φl, Φs are created. Further, the R, G, and B color signals output from the TV circuit 16 are converted into A / D (analog / digital) conversion circuits 1 respectively.
Is converted to a 4-bit digital signal via 8-20,
The signals are input to AND circuits 21 to 23, respectively. Further, a digital signal corresponding to the color signal R output from the AND circuit 21 is supplied to a color liquid crystal panel through an OR circuit 24.
It is input to an R driver 28 for driving 27 R segments. Further, a digital signal corresponding to the color signal G output from the AND circuit 22 is input to a G driver 29 for driving a G segment of the color liquid crystal panel 27. Further, a digital signal corresponding to the color signal B output from the AND circuit 20 is input to a B driver 30 for driving a B segment of a color liquid crystal panel 27 via an OR circuit 26. These R driver 2
8, G driver 29 and B driver 30 each have a latch signal Φ
1 and the shift signal Φs are input. Further, a latch signal φ1 is input to the scanning side driver 31 as a shift clock, and shift driving is performed in synchronization with the signal φ1.

Meanwhile, a signal from the key operation unit 32 is input to the tuning control circuit 12. The detailed configuration of the key input unit 32 will be described later with reference to FIG. Reference numeral 33 denotes a tuning memory for storing a mode selected when the power is turned off and its frequency.

Further, 34 is a power switch and 35 is a battery. When the power switch 34 is turned on, the one-shot pulse signal POI output from the power circuit 36 is output as a gate control signal to the AND circuits 21 to 23 via the inverter 37 and output to the memory 33 and the code generation circuit 38. Is done.
The code generator 38 outputs code signals corresponding to the VHF, UHF, AM, and FM modes stored in the memory 33 as shown in FIG. IR output from this code generation circuit 38
The signal is output to the OR circuit 24, the IG signal is output to the OR circuit 25, and the IB signal is output to the OR circuit 26.

FIG. 3 shows the relationship among the various timing signals Φv, Φh, Φl, Φs output from the timing control circuit 17.
When the power is turned on, the power-on signal POI generated from the power supply circuit 36 becomes "H" level for a certain period of time, for example, three seconds, during which 180 vertical synchronizing signals Φv are output. In addition, about 262 horizontal synchronization signals Φh are output within one vertical scanning period. The signal Φs is a shift clock of the R, G, B drivers 28 to 30 and a sampling clock of the A / D conversion circuits 18 to 20, and 160 signals are output every one H in one horizontal scanning period, and one horizontal scanning line is output. Is sampled 160 times. The sampled data is the shift signal Φ
The data is sequentially shifted and input to the R, G, and B drivers 28, 29, and 30 in synchronization with s. When 160 data for one horizontal scanning period are input to the R, G, B drivers 28 to 30, the latch signal Φl
Thereby, data for one horizontal scanning period is latched in the latch circuits in the R, G, B drivers 28 to 30. Then, a gradation signal corresponding to the values of the latched 4-bit digital data “0000” to “1111” is created and given to the color liquid crystal pulse 25.

Next, FIG. 2 is a plan view of a portable color television according to the present invention. 2, the same parts as those in FIG. 1 are given the same numbers. In FIG. 2, reference numeral 41 denotes a switch for switching between a television mode and a radio mode, reference numeral 42 denotes a switch for switching between a UHF mode and a VHF mode, and reference numeral 43 denotes a switch for switching between an FM mode and an AM mode. is there. Reference numeral 44 denotes an up key for increasing the reception frequency, and reference numeral 45 denotes a down key for decreasing the reception frequency. The display 46 moves left and right in response to the operation of the up key 44 or the down key 45.

Next, the operation of the embodiment of the present invention configured as described above will be described. First, when the power switch 34 is turned on, the signal POI output from the power circuit 36 is at the "1" level for, for example, three seconds as shown in FIG. Therefore, the gates of the AND circuits 21 to 23 are closed. This inhibits the output of digital signals corresponding to the R, G, B color signals output from the A / D conversion circuits 18 to 20 to the R, G, B drivers 28 to 30. No television screen is displayed on panel 27. In addition, the signal POI and the memory 3
The mode data stored in the memory 33 is read from the code generation circuit 38 by being output to 3 and the code generation circuit 38. The code generation circuit 38 generates a code signal as shown in FIG. 4 according to the output of the memory 33, and outputs it to the OR circuits 24 to 26 in synchronization with the shift signal φs. Therefore, the R driver 28, G driver 29, and B driver 30
Code generation circuit 38 instead of R, G, B signals from TV circuit 16
Will be written. The output from the code generation circuit 38 lasts for 3 seconds as shown in FIG.
Are displayed in a color-color represented by a signal IR.IG, IB output from. For example, if the mode data stored in the memory 33 is
In the case of VHF, “1111” is output as an IR signal. The IR signal causes the color liquid crystal panel 27 to turn red (R).
Is displayed with. Thus, when the color liquid crystal panel 27 is displayed in red (R), it is determined that the mode is the VHF mode.

Similarly, when the contents of the memory 33 are in the UHF mode, "1111" is output as the IG signal output from the code generation circuit 38, and the color (G) is output to the color liquid crystal panel 27.
Is displayed.

Further, when the contents of the memory 33 are in the AM mode, "1111" is output as the IB signal output from the code generation circuit 38, and blue (B) is displayed on the color liquid crystal panel 27. Further, when the content of the memory 33 is in the FM mode, "1111" is output as the IR signal and the IG signal output from the code generation circuit 38, and yellow is displayed on the color liquid crystal panel 27.

By the way, the signal POI returns to "0" level after a certain period of time after the power switch 34 is turned on as shown in FIG. 3, so that the gates of the AND circuits 21 to 23 are opened. As a result, the television screen is displayed on the color liquid crystal panel 27.

In this way, the color liquid crystal panel 27 is displayed in a color corresponding to the mode only for a certain period of time after the power switch 34 is turned on, so which mode is selected when the power switch 34 is turned on. Can be visually recognized with certainty.

[Effects of the Invention] As described in detail above, according to the present invention, the previous reception mode is stored in a portable television or the like having a plurality of reception modes, and when the power is turned on, the previous reception mode is read. For a predetermined period after power-on, the display mode is displayed on the screen in the display color corresponding to the read reception mode, so that the previous reception mode can be confirmed by color. The reception mode can be confirmed by the display color of the screen, and after a predetermined time, it switches to the normal screen display. Therefore, the display of the reception mode does not affect the normal display of the screen. Even if no device is provided, it is possible to prevent the occurrence of tuning errors as described in the conventional example.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a portable color television according to the present invention, FIG. 2 is a plan view of the television, FIG. 3 is a timing chart for explaining the operation, and FIG. It is a figure showing an input-output relation. 21 to 23: AND circuit, 27: Color LCD panel, 33:
... Tuning memory, 34 ... Power switch, 38 ... Code generation circuit.

Claims (1)

(57) [Claims] 1. A mode storing means for storing a previous receiving mode of a receiving circuit having a plurality of receiving modes; a display color storing means for storing a plurality of receiving modes and display colors in association with each other; Reading means for reading out the previous reception mode from the mode storage means when power is supplied to the circuit; and reading out a corresponding display color from the display color storage means from the reception mode read out by the reading means from the mode storage means. And a display means for displaying in this display color during the period of (1).