KR890002390B1 - T.v. circuit for safety watching distance - Google Patents

Abstract

The circuit comprises an ultrasonic transmitter and an ultrasonic receiver for watching distance measurement and a control circuit for adjusting TV brightness. When a person approaches within the appropriate watching distance, the brightness of the TV turns dark. The standard watching distance adjusting circuit (F) determines the appropriate distance corresponding to the frame size and adjusts the variable registor.

Description

TV Proximity Protection System for Vision Protection

1 is a block diagram of the present invention.

2 is a circuit diagram of an embodiment of the invention.

3 is an output waveform diagram of each part of FIG.

3 (a) is an output waveform diagram of part A;

3 (b) is an output waveform diagram of B, C, and D units.

3 (c) is an output waveform diagram of part E. FIG.

3 (d) is an output waveform diagram of part F. FIG.

3 (e) is an output waveform diagram of an H portion.

3 (f) is an output waveform diagram of a part G. FIG.

3 (g) is an output waveform diagram of part I. FIG.

* Explanation of symbols for main parts of the drawings

A: clock pulse generator circuit B: ultrasonic signal generator circuit

C: ultrasonic amplification circuit D: impulse generating circuit

E: Reception time delay circuit F: Viewing distance reference circuit

G: Viewing distance comparison judgment and chattering prevention circuit H: Receiving amplifier circuit

I: Operation signal delay circuit J: Operation release circuit

K: operation signal sustain circuit L: initial operation suppression circuit

M: operation execution circuit R: constant voltage power supply circuit

A ₁ : operational amplifier B ₁ , B ₂ : power supply terminal

C ₁ ~ C ₂₅ : Capacitor D _{1 ~} D ₃ : Diode

D ₄ : Zener Diodes F ₁ to F ₆ : Flip Flops

G ₁ to G ₄ G ₆ G ₈ to G ₁₀ : NAND gate G ₅ , G ₇ , G ₁₁ , G ₁₂ : AND gate

I ₁ to I ₆ : Inverter Q ₁ to Q ₅ : Transistor

L ₁ : Inductance R ₁ ~ R ₃₃ : Resistance

IC ₁ : Integrated Circuit RY: Relay

T: Trans TV: TV luminance terminal point

LED: Light emitting diode VR ₁ , VR ₂ : Variable resistor

TR: Sowing Machine RE: Sowing Machine

The present invention relates to preventing eyes from deteriorating when watching television in close proximity, and by installing a transmitter for transmitting ultrasonic waves and a receiver for receiving ultrasonic waves, the luminance of the television can be adjusted according to the viewing distance. By constructing a control circuit so that when the television viewer is watching the distance close to the eyesight of the eyes, the television screen is darkened, and when the viewer steps away from the proper viewing distance, the television screen is returned to its original state. It aims to be able to protect against fatigue or loss of vision.

In general, television provides various media, news, and soap operas, providing many cultural benefits and new information and news to viewers. The drawback was increased fatigue and reduced vision.

Conventionally, there was a television goggles installed in front of a television screen to solve the above drawbacks, but the goggles do not solve the underlying problem that viewers watch at close range, so they do not have much effect and when the viewer watches at close range, There was a defect that reduced vision.

The present invention is to solve the above-mentioned drawbacks, when the viewer is watching the television at a close range to deteriorate the eyesight by adjusting the screen brightness of the television by using ultrasonic waves to prevent the viewer from watching at close range As a solution to the underlying problem of deterioration of eyestrain and vision, this will be described in detail with reference to FIGS. 1 and 2 as follows.

The clock pulse generation circuit portion A including the NAND gates G ₁ and G ₂ , the resistors R ₁ and R ₂ , and the capacitor C ₁ includes a flip-flop F ₁ , a resistor R ₈ , and a capacitor C. ₉ ) is connected to an impulse generating circuit portion (D) consisting of an end gate (G ₇ ), a NAND gate (G ₈ to G ₁₀ ), and a condenser (C ₁₂ ) and a viewing distance comparison and chattering prevention circuit portion (G). The ultrasonic signal generating circuit portion B and the impulse generating circuit portion D, each of the NAND gates G ₃ and G ₄ , the variable resistor VR ₁ , the resistors R ₃ and R ₄ , and the capacitor C ₂ , are an AND gate. Ultrasonic amplifying circuit section (C) consisting of (G ₅ ) and operational amplifier (A ₁ ), resistors (R ₅ to R ₇ ) capacitors (C ₃ to C ₆ ), reactance (L ₁ ) and transformer (T ₁ ) It is connected to the transmitter TR.

The impulse generating circuit portion D includes the NAND gate G ₆ and the flip flop F through the reception time delay circuit portion E composed of the flip flop F ₂ , the resistors R ₉ and R ₁₀ , and the capacitor C ₁₀ . ₃ ) is connected to the viewing distance reference circuit portion F composed of the capacitor C ₁₁ and the variable resistor VR ₂ , and the viewing distance reference circuit portion F is connected to the viewing distance comparison determination and chattering prevention circuit portion G. .

The receiver (RE) consists of an inverter (I ₁ to I ₅ ), a resistor (R ₁₂ to R ₂₀ ), a capacitor (C ₁₃ to C ₁₈ ), a diode (D ₁ , D ₂ ) and a transistor (Q ₅ ). It is connected to the reception amplification circuit unit (H), and the reception time delay circuit unit (E) is also connected to the reception amplification circuit unit (H) and to the viewing distance comparison judgment and the chattering prevention circuit (G). The viewing distance comparison determination and chattering prevention circuit (G) includes an operation signal delay circuit unit (I) including an integrated circuit (IC ₁ ), an end gate (G ₁₁ ), a light emitting diode (LED), and a resistor (R ₂₁ , R ₂₂ ). And a flip flop (F ₄ ), a condenser (C ₁₉ ) and a resistor (R ₂₃ ), respectively, which are connected to the deactivation circuit section (J), and the actuation signal delay circuit section (I) is a flip flop (F ₅ ) and a condenser (C _20). Is connected to an operating signal sustaining circuit section (K) consisting of an AND gate (G ₁₂ ), a transistor (Q ₃ , Q ₄ ), a resistor (R ₃₁ , R ₃₃ ), and a capacitor (C _21). ), A diode D ₃ , an inverter I ₆ , and a relay RY.

The constant voltage power supply circuit R connected by the transistors Q ₁ and Q ₂ , the capacitors C ₂₂ and C ₂₃ , the resistors R ₂₅ and R ₂₇ and the zener diode D ₄ is connected to the flip flop F ₆ . It is connected to the operation execution circuit portion M through an initial operation suppression circuit portion L composed of resistors R ₂₈ to R ₃₀ and capacitors C ₂₄ to C ₂₅ , and the terminal point TV of the operation execution circuit portion M is connected. It is made by connecting to the television brightness terminal point.

,Q_A,Q_P는 회로내의 각 소자의 출력점이며 Ro는 소자의 리셋 입력점이다.Unexplained symbols B ₁ and B ₂ are power input terminals and Q,

, Q _A , Q _P are the output points of each device in the circuit, and Ro is the reset input point of the device.

3 is a view illustrating output waveforms of each part of FIG. 2.

Referring to the operation and effect of the present invention configured as such a circuit as follows.

The clock pulse generating circuit portion A generates a periodic pulse signal of about 1 second (in some cases, the period can be selected differently), so that the ultrasonic wave is periodically emitted, and about ₄₀ (KHZ) in the ultrasonic signal generating circuit portion B. Ultrasonic wave signal generated by) is amplified by the ultrasonic amplification circuit part C only during the periodic impulse time of the flip flop F ₁ of the impulse generating circuit part D through the ultrasonic wave transmitter TR. Launch ultrasonic waves in the air.

는 수신 시간 지연 회로부(E)의 회로에 펄스를 공급해 주게 된다.In the impulse generating circuit section D, a short pulse is sent to the output Q of the flip flop F ₁ by the periodic pulse signal generated by the clock pulse generating circuit section A so that the ultrasonic signal is amplified only during the impulse time. In addition, the output is the same in phase and out of phase with the output Q of the flip-flop (F ₁ )

Supplies a pulse to the circuit of the reception time delay circuit section (E).

The reception time delay circuit unit E receives the pulse signal sent from the impulse generating circuit unit D immediately after the ultrasonic wave is fired in order to prevent the emitted ultrasonic wave from being reflected and received directly by the ultrasonic wave receiver RE by diffraction. The delay signal is sent to the reception signal amplifying circuit unit H to delay the time, and the pulse input signal of the viewing distance reference circuit unit F is supplied. In the viewing distance reference circuit unit F, the reception time delay circuit unit E receives a delayed pulse signal and sets a reference time for the ultrasonic wave to be returned. The viewing distance is adjusted by the variable resistor VR ₂ according to the size of the TV screen. And the viewing distance comparison determination and chattering circuit section (G) And gate (G ₇ ) the time of the reference pulse width sent from the viewing distance reference circuit section (F) and the pulse signal sent from the receiving amplification circuit section (H) receiving the pulse signal g when the chattering preventing circuit in _a single pulse signal is out and the received pulse signal comes lower than the reference time, the aND gate is (g ₇₎ not by the logic output pulse leaving the viewer in the reference time compared in The distance between the viewer and the television will be judged.

The reception amplification circuit unit H amplifies the signal reflected by the ultrasonic wave transmitter TR and reflected by the receiver PA and amplifies the output logical state "1" or "0" of the detected signal. 0 when no signal is received, and a logic state of "1" while a signal is received, which is transmitted to the comparison circuit of the viewing distance comparison judgment and chattering circuit section G, and the pulse signal received by the reception time delay circuit E. Removes the ultrasonic signal directly by diffraction without being reflected, and sends only the reflected signal to the comparison circuit of the viewing distance comparison determination and the chattering prevention circuit unit (G).

The operation signal delay circuit (I) uses a decimal counter integrated circuit (IC) as a circuit for receiving and counting pulse signals sent from the viewing distance comparison determination and chattering circuit portion (G). If 10 pulses are sent from (G), the outputs Q _A and Q _D are represented by binary numbers and both become "1", and one pulse signal is sent to the operation signal sustaining part (K) by the AND gate (G ₁₁ ). Export.

If the pulse signal from the viewing distance comparison judgment and the chattering circuit section G does not come in continuously and stops, the pulse signal sent from the deactivation circuit section J puts all the outputs of the counting circuit in the state of "0". Reduce the coefficient to "0". The light emitting diode (LED) connected to the output Q _A of the integrated circuit (IC ₁ ) is increased once each time the signal sent from the comparison and the chattering circuit unit (G) is received twice in succession so that the viewer is in close proximity. Inform them. This circuit adjusts the period of the clock pulse generation circuit section A for about 10 seconds in consideration of the time when a person passes in front of the TV for a short time or adjusts the channel selection volume on the TV which is not a remote control method. The pulse signal is not sent to the active signal sustaining circuit (K). If the viewer continues to be close to the TV after this time, turn the operation execution circuit (M) to dark. Operate. At this time, the viewer is naturally retracted because the screen is hard to see. When the viewer retreats behind the distance determined by the viewing distance reference circuit unit F, the screen is restored to its original state.

는 "0"상태에서 "1"의 상태로 바뀌고 작동 신호지연 회로부(I)의 계수를 "0"의 상태를 만든다.The deactivation circuitry J receives a pulse signal from the viewing distance comparison determination and chattering circuitry G, and if the viewer continues to be close to the television after 10 seconds has elapsed, the flip-flop F ₅ of the activation signal sustaining circuitry K If the output Q is kept in the "1" state and the viewer backs behind the viewing distance determined by the viewing distance reference circuit unit (F), the operation is canceled because the viewing distance comparison judgment and the chattering circuit unit (G) do not emit pulses. The capacitor C ₁₉ of the circuit section J is discharged to output the flip flop F.

Is changed from the "0" state to the "1" state, and makes the coefficient of the operation signal delay circuit part I "0".

In addition, the output Q of the flip flop F becomes from the "1" state to the "0" state, and resets the operation signal sustain circuit part K so that the output Q of the flip flop F ₅ of the operation signal sustain circuit part K becomes Let it be "0".

The constant voltage circuit part R selects a part of the power supply B _{1 of the} power supply of the television circuit and supplies the power supply voltage B ₂ to the circuit of the present invention. The relay operation power supply and the ultrasonic amplification circuit power supply are the constant voltage power supply. It is possible to use the input voltage (B ₁ ) of and according to the type of television, it is possible to select and use the required power supply directly without the constant voltage power supply circuit section (R), and to use the constant voltage circuit in some cases.

The operation execution circuit portion M is a circuit for operating the relay RY according to the pulse signal received from the output Q of the flip-flop F ₅ of the operation signal sustaining circuit portion K. The television contrast or luminance adjustment circuit and the relay output terminal By connecting them (if the viewer is watching nearby), an adjustment circuit is connected to the resistor (R ₃₃ ) to darken the screen and allow the viewer to return to the screen when the viewer steps back. The operation signal sustaining circuit section K receives one pulse signal which is sent only when the outputs Q _A and Q _D of the integrated circuit IC of the operation signal delay circuit section I are both in the state of "1", and then again 10 seconds later. The output of the flip flop F ₅ is kept at a state of "1" until one pulse signal is inputted, and if the pulse signal is continued from the viewing distance comparison judgment and the chattering circuit part G, it is transferred to the operation disassembly circuit part J. It does not come in and the output Q of the flip-flop F ₄ of the deactivation circuitry J resets the operation signal sustaining circuitry K to bring the output to a state of “0.” The initial actuation suppression circuitry L turns off the television. Do not operate the operation execution circuit part (M) for about 40 seconds because it requires a lot of time due to sufficient stability of the screen, channel selection, and sound control. It is for.

In this way, the present invention operates when the TV viewer is watching the television at a distance that reduces the eyesight of the eyes so that the TV screen is darkened so that the viewer can watch out of the close range, and when the television is viewed out of the near range, It is very ideal to be able to return to and to keep the viewer's eyes to prevent eyestrain or deterioration of the viewer's eyes.

Claims (1)

The clock pulse generation circuit unit A is connected to the impulse generation circuit unit D viewing distance comparison determination and chattering prevention circuit unit G, and the impulse generation circuit D and the ultrasonic signal generation circuit B are ultrasonic amplification circuits C. The impulse generating circuit (D) is connected to the viewing distance comparison determination and chattering prevention circuit (G) through the reception time delay circuit (E) and the viewing distance reference circuit (F). The reception time delay circuit (E) and the receiver (RE) are connected to the reception amplifier circuit (H), and the viewing distance comparison judgment and chattering prevention circuit (G) are the operation signal delay circuit (I) and the operation release circuit (J). Are connected to the operation signal continuity circuit (K), respectively, and the operation signal continuity circuit (K) thereof is connected to the operation execution circuit (M), and the constant voltage power supply circuit (R) is connected to the initial cropping suppression circuit (L). Directly connected to the operation execution circuit (M) and the operation execution circuit (M) thereof to adjust the contrast and brightness of the television. Television close-up protection system for eyesight protection connected to the terminal.

Images