JPS62122470A - Battery check device for portable color thlevision receiver - Google Patents

Abstract

PURPOSE:To check a battery of a portable color television receiver by detecting a power voltage at application of power supply and displaying a color in response to the detected power supply voltage on a television picture for a prescribed time. CONSTITUTION:In turning on a power switch 27, a signal POI outputted from a power supply circuit 29 goes to '1' level for, e.g., 3sec. Thus, a gate of AND circuits 17-19 is closed and no television picture is displayed on a color liquid crystal panel 25. Further, a 6-bit code signal corresponding to a voltage of a battery 28 is outputted from a voltage detection circuit 30 by using the signal POI, a decoder 31 generates a code as outputs (a, b) in response to the output of the voltage detection circuit 30 and outputs them to an OR circuit 20 or 21 synchronously with a shift signal phis. Thus, the output (a, b) from the decoder 31 are written on an R driver 22 and a B driver 24. Since the output from the decoder 31 continues for 3sec, the color liquid crystal panel 25 is displayed for 3sec in a color represented by the outputs (a, b).

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a battery check device for a portable color television that displays the remaining battery level of the portable color television in a predetermined color.

[Prior art of the invention and its problems] In recent years, portable color televisions that employ liquid crystals (LC) or ultra-small cathode ray tubes have been put into practical use.

Currently, the battery life of such a portable color television is only a few hours, so if the television is used for a long period of time, the battery must be replaced or charged frequently. Furthermore, when watching a portable TV on the go, the battery often runs out suddenly, even when you think it still has power.

[Object of the Invention] The present invention has been made in view of the above points, and its object is to provide a battery check 1m for a portable color TV, which displays the remaining battery power of the portable color TV in color according to the remaining power. Our goal is to provide the following.

[Summary of the invention] The battery check of a portable color television is improved by detecting the power supply voltage when the power is turned on and displaying a color corresponding to the detected power supply voltage on the television screen for a predetermined period of time.
7. I'm trying to keep up.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a portable color television. In the figure, reference numeral 11 denotes a TV tuner which selects a desired desennel broadcast wave from among the television broadcast waves tilted on the antenna 10, converts it to an intermediate frequency, and outputs it to the color TV circuit 12.

The color TV circuit 12 amplifies the TV signal sent from the TV tuner 11, and then performs processing such as video detection, synchronization separation, audio detection, and color signal reproduction. Then, the horizontal synchronization signal VS and the vertical synchronization signal Hs are outputted from the color TV circuit 12 to the timing control circuit 13, and various timing signals ΦV, Φh, ΦC1ΦS are created. Further, the R, G, and B color signals outputted from the color TV circuit 12 are converted into 4-bit digital signals via A/'D (analog, .'digital) conversion circuits 14 to 16, respectively. The signals are input to AND circuits 11 to 19, respectively. Further, a digital signal corresponding to the color signal R outputted from the AND circuit 17 is inputted via an OR circuit 20 to an R driver 22 for driving the R segment of the color liquid crystal panel 25. Further, a digital signal corresponding to the color signal G outputted from the AND circuit 18 is input to a G driver 23 for driving the G segment of the color liquid crystal panel 25. Further, a digital signal corresponding to the color signal B output from the AND circuit 19 is inputted via an OR circuit 21 to an 8 driver 24 for driving 8 segments of a color liquid crystal panel 25. These R drivers 22. A latch signal Φ2 and a shift signal ΦS are input to the G driver 23, 8 driver 24, respectively.

Further, a latch signal Φ°C is input to the scanning side driver 2G, and shift driving is performed in synchronization with the signal Φ°C.

Furthermore, 21 is a power switch, and 28 is a battery.

When the power switch 27 is turned on, the one-shot pulse signal PO1 output from the power supply circuit 29 is inverted via the voltage detection circuit 30, decoder 31, and inverter 32, and is supplied to the AND circuits 17 to 19 as a gate control signal. Ru. Further, power is supplied from the power supply circuit 29 to each circuit. Further, the potentials of the anode and negative bridge of the battery 28 are output to the voltage detection circuit 30. The detailed configuration of this voltage detection circuit 30 will be described later using FIG.
This voltage detection circuit 30 outputs a 6-bit code signal corresponding to the voltage V of the battery 28 to the decoder 31. A shift signal ΦS is input to this decoder 31, which decodes the code signal and outputs two sets of 4-bit signals a and b as shown in FIG.

The output a of this decoder 31 is output from the OR circuit 20.
The output signal is output to the OR circuit 21.

Next, the detailed configuration of the voltage detection circuit 30 will be explained with reference to FIG. 2. The signal Pol output from the power supply circuit 29 is input to the base of the switching transistor Q. Further, the voltage V of the battery 28 is input to the collector of the transistor Q.

Furthermore, the voltage V is divided by resistors R1 to R7,
The potential at the connection point between each resistor is determined by comparators CP1 to CP6.
is input to one terminal of And the above comparator CP
The potential of the anode of the constant voltage diode D (approximately 0.7V) is applied to the tenth elements 1 to CP6! ! Input as quasi-voltage. When the voltage V of the battery 28 is the highest, the '°1' signal is output only from the comparator CP1. and,
As the voltage V decreases, comparators CPI and CP
2→comparators CPI to CP3→...→comparators CPI to CP6, the number of comparators that output a "1" signal increases. In other words, when the "1" signal is output from only the comparator CP1, the value of the voltage V is the largest, and when the "1" signal is output from all of the comparators CP1 to CP6, the value of the voltage V is the smallest. It is.

Next, the input/output characteristics of the decoder 310 will be explained with reference to FIG. In FIG. 4, numbers “1” to “6” are entered in the output column of the voltage detection circuit 30, but “1”
” is obtained only from comparator CP1 in Figure 2.
"2" indicates the case where the "1" signal is output from both of the comparators CP1 and CR2 in FIG.
The case where the ``1'' signal is output from any of P3 is expressed as ``
4" indicates a case where a "1" signal is output from any of the comparators CPI to CP4 in FIG. 2, and "51" indicates a case where a "1" signal is output from any of the comparators CP1 to CP5 in FIG. , "6" is comparator C in Figure 2
This shows a case where a "1°" signal is output from any of PI to CP6.Here, in the case of "1", the signal rllllJ is output, and in the case of "2", the signal rllllJ is output.
If loloJ is "3", the signal is [010
When 1J is "4", rololJ is used as signal a, and when 1J is "5", rloloJ is used as signal a, and "6" is used as signal a.
”, N111J is output as signal a. In this way, depending on the output of the voltage detection circuit 30, the data of the signal a or the signal S is rllllJ, rloloJ.

By changing rololJ, the brightness of the color of the displayed screen (red for signal a, blue for signal S) is changed. Here, rllllJ is the most ll1ifW
is a strong signal.

Here, the relationship among the various timing signals Φ■, Φh, ΦQ, and ΦS output from the timing l1lt11 circuit 13 is shown in FIG. The power-on signal POI generated from the power supply circuit 29 is at the "H°" level for a certain period of time, for example, 3 seconds when the power is turned on, and during that time the vertical synchronization signal ΦV
180 shots are output. Also, approximately 262 horizontal synchronizing signals Φh are output within one vertical scanning period. Also, the signal ΦS
is the shift clock of the R, G, B drivers 22 to 24 and the sampling clock of the A/D conversion circuit 14 to 1, and 16"0 is output within one horizontal scanning period every other day, and one horizontal scanning line is output. The video signal of is sampled 160 times.Then, the sampled data is converted into a shift signal
The signals are sequentially shifted and input to the R, G, and B drivers 22, 23, and 24 in synchronization with the . And R, G, B driver 22 ~
When 160 pieces of data for one horizontal scanning period are input to the R, G, and B drivers 22 to 24 by the latch signal Φa,
Data for one horizontal scanning period is latched into the latch circuit in 24. Then, a gradation signal corresponding to the latched 4-bit digital data "'oooo" to "i ii i" is created and applied to the color liquid crystal panel 25.

Next, the operation of an embodiment of the present invention configured as described above will be explained. First, when the power switch 21 is turned on, the signal Pot output from the power supply circuit 29 remains at the 1" level for, for example, 3 seconds as shown in FIG. 3. Therefore, the gates of the AND circuits 11 to 19 are closed.

As a result, the R, G, and B digital signals corresponding to the R, G, and B color signals output from the Δ/D conversion circuits 17 to 19 are
G.

Since the output of B to the drivers 22 to 24 is prohibited, the television screen is not displayed on the color liquid crystal panel 25. Further, since the transistor Q shown in FIG. 2 becomes conductive due to the signal Pot, a 6-bit code signal corresponding to the voltage of the battery 28 is outputted from the voltage detection circuit 30. The decoder 31 outputs a code as shown in FIG. 4 in response to the output of the voltage detection circuit 30.

b, and OR circuit 2 is generated in synchronization with S of the shift signal.
Output to 0 or 21. Therefore, R driver 22, B
The driver 24 receives RlG and B from the color TV circuit 12.
The output a from the decoder 31 instead of the signal.

b will be written. Since the output of the decoder 31 continues for 3 seconds as shown in FIG.
Displayed in color. For example, when the voltage V of the battery 28 is high, only the comparator CPI outputs the '1' signal, so the output of the decoder 31 is '1' as shown in FIG.
1111 “Howl.

This signal causes the color liquid crystal panel 25 to turn blue (
B) is displayed. This blue display indicates that the voltage V of the battery 28 is sufficient. By the way, battery 28
voltage V becomes a little lower, comparators CP1 and C
When the signal “゛1゛1゛” is sent only from R2, the fourth
As shown in the figure, the output of the decoder 31 is "1010." Similarly, this data is output to the B driver 22 and the color liquid crystal panel 25 displays blue (B). Since the output of 1 degree has become smaller, the blue color l[1 degree has become a little smaller.Furthermore, when the voltage of the battery 28 becomes smaller, the output of the decoder 31 becomes "0101" as shown in FIG. Therefore, the brightness of the blue (B) display on the color liquid crystal panel 25 further decreases, indicating that the voltage V of the battery 28 is decreasing.

By the way, when the voltage V of the battery 28 roughly decreases, the comparators CP1 to CP4 output a 1" signal. Therefore, the output b from the decoder 31 disappears and the output a becomes as shown in FIG. This signal "0101" is outputted to the R driver 22 via the off circuit 20 in synchronization with the shift signal ΦS.

Then, the data is held in the R driver 22 by the latch signal Φ2 output every 160 shift signals ΦS, and the color liquid crystal panel 25 displays it in red (R) with a brightness of "0101'" (slightly dark). be done. This red display indicates that the voltage V of the battery 2B is low. By the way, when the voltage V of the battery 28 becomes even lower and the comparators CPI to CP5 start outputting the "1" signal, the output of the decoder 31 becomes "1" as shown in FIG.
1010''. Similarly, this data is R
This is output to the driver 22 and displayed in red (R) on the color liquid crystal panel 25, but since the output of the decoder 31 is increased, the brightness of the red color is slightly higher. Furthermore, as the voltage V of the battery 28 becomes smaller, the output of the decoder 31 becomes '1111°' as shown in FIG. You will be informed that the voltage ■ is decreasing further.

By the way, since the signal Pot returns to 4101 levels after a certain period of time after the power switch 21 is turned on, as shown in FIG. 3, the gates of the AND circuits 17 to 19 are opened. As a result, the television screen is displayed on the color liquid crystal panel 25.

In this way, the color is displayed in accordance with the voltage V of the battery 28 for a certain period of time after the power switch 21 is turned on, so you can always check the remaining amount of the battery 28 when trying to watch TV. can. Also, since it is displayed in color, it is very easy to understand.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, in addition to the power switch 27, a battery check switch 4 that displays the battery life is provided.
1, and if you want to know the battery life, use this switch 4.
1 is turned on, and a one-shot pulse is sent from the one-shot circuit 42 via the OR circuit 43 as a signal PO[' to the voltage detection circuit 30° and the decoder 31. Inverter 3
2 is output. Here, since the signal @PO1 is input to the OR circuit 43,
The battery life can also be displayed when the power switch 2γ is turned on.

In this way, by providing the battery check switch 41 separately from the power switch 27, if you want to know the battery life while watching portable color TV after turning on the power, you can check the battery life by operating this switch 41. can be approved.

[Effects of the Invention] As detailed above, according to the present invention, the battery life is displayed when the N source switch or battery switch is turned on, so that when the battery life becomes short, the battery can be replaced as soon as possible. It is possible to provide a battery check device for a portable color television that is very easy to use.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a portable color television according to the present invention, FIG. 2 is a diagram showing the voltage detection circuit shown in FIG. 1, FIG. 3 is a timing chart for explaining the operation, and FIG. This figure shows the input/output relationship of the decoder, and FIG. 5 is a circuit diagram showing a part of another embodiment of the present invention. 17-19...AND circuit, 20.21...OR circuit, 25...LCD panel, 27...power switch,
30... Voltage detection circuit, 31... Decoder, 41...
...Battery check switch, 42...One shot circuit. Applicant's agent Patent attorney Hikoju V Suzue
POI Figure 2 Figure 4 Figure 5

Claims (2)

[Claims] (1) A means for detecting power-on and generating an initial pulse, a means for detecting the power supply voltage when the initial pulse is generated, and a display for a predetermined period of time on the screen in a color corresponding to the power supply voltage detected by this means. A battery checking device for a portable color television, characterized by comprising means for checking the battery of a portable color television. (2) A battery check key, a pulse generating means that detects the operation of the battery check key and generates a pulse, a voltage detecting means that detects the power supply voltage when the pulse is generated, and a predetermined pulse generated by the pulse generating means. 1. A battery check device for a portable color television, characterized by comprising means for cutting off the timely television reception video and displaying the screen in a color corresponding to the power supply voltage detected by the voltage detection means.