CN1115399A - Lamp opreation device for a projection type LCD projector - Google Patents

Abstract

The invention relates to a lamp operating device used for a projection type LCD projector. According to signals received from outside and surrounding illumination situation, the device can reduce power consumption through controlling operating power supply for the lamp and prolong the service life of the lamp through effectively controlling light output of the lamp. The device comprises a lamp that projects light on a projection screen through an LCD display part, a lamp operating part that is used for operating the lamp, a detection part that detects luminance of the projection screen, the receiving of video signals and synchronous signals and abnormality of the receiving signals through surrounding illumination and a control part used for controlling the lamp operating part according to the signals received from the detection part.

Description

The lamp operating that is used for projection type LCD projector

The present invention relates to a kind of lamp operating that is used for projection type LCD (liquid crystal display) projector, particularly relate to a kind of like this lamp operating that is used for projection type LCD projector, the operating power that this device basis is supplied with lamp from signal extraneous and that the ambient illumination situation receives by control can reduce power attenuation, and exports the serviceable life that can prolong lamp by the light of effective control lamp.

In general, projection type LCD projector focuses on the light from lamp by utilizing lens, and the LCD display unit by a receiving video signals the optical projection that focuses on to projection screen, an image is shown on a projection screen.

Therefore, it is very important influencing the life-span of lamp and the light output of the lamp that increases power attenuation.

Yet a kind of existing conventional projection type LCD projector maintains steady state value to the output of the light of lamp, and it does not consider the reception of vision signal and synchronizing signal one class signal, even also is like this under the abnormal situation of signal that receives.

Simultaneously,, conventional projection type LCD projector do not consider the brightness of ambient illumination because being arranged to the light with same brightness projected on the projection screen, so even ambient illumination is dark, the output of lamp also remains unchanged.

Therefore, the problem of conventional projection type LCD projector for the unusual and ambient illumination of keeping the constant reception of not considering signal of output, received signal is: the serviceable life of lamp is short and power attenuation is big.

In addition, conventional projection type LCD projector has following problem: the high-pressure discharge lamp in this projector takies about 30 to 60 seconds long-time, make it enter adequate illumination, because it is impossible making the instantaneous turn-on and turn-off of lamp, so also needing to cause just to watch an image segment length's time, is shortened the serviceable life of lamp, and start and restarting under the situation about being continuously repeated, cause the possibility of starting failure to increase, and, cause infringement to circuit owing to apply starting voltage till lamp is started continuously.

The objective of the invention is to provide a kind of lamp operating that is used for projection type LCD projector in order to address the above problem, if do not receive any vision signal or synchronizing signal, this device can make lamp enter into power save mode, this lamp operating can be according to the output of the lamp of brilliance control of ambient illumination, and, can prolong the serviceable life of lamp and reduce power attenuation by the alternately operation of two auxiliary bulbs when start light.

These and other purpose of the present invention and feature realize by a kind of lamp operating that is used for projection type LCD projector is provided, this device comprises: one is used for by a LCD display unit light being projected a lamp on the projection screen, a lamp functional unit that is used for operating light, a reception and a unusual detection part and the control assembly that is used for controlling the lamp functional unit of received signal that is used for by the brightness of a projection screen of ambient illumination detection, also detecting vision signal and synchronizing signal according to the signal that receives from detection part; Perhaps by providing a kind of lamp operating that is used for projection type LCD projector to realize, it comprises: a lamp that is used for by a LCD display unit light being projected a projection screen, an illuminating position detection part that is used for detecting the brightness of projection screen by the brightness of ambient illumination, a lamp operation control assembly and a lamp functional unit that is used for operating light under the control of lamp operation control assembly that is used for controlling the brightness of lamp according to the signal that receives from the illuminating position detection part; Perhaps by providing a kind of lamp operating that is used for projection type LCD projector to realize, it comprises: one is used for by a LCD display unit light being projected lamp on the projection screen, a signal that is used to detect the reception of vision signal and synchronizing signal receives detection part, a lamp operation control assembly and a lamp functional unit that is used for operating light under the control of lamp operation control assembly that is used for controlling the operation of lamp according to the signal that receives the detection part reception from signal; Perhaps by providing a kind of lamp operating that is used for projection type LCD projector to realize, it comprises: one is used for by a LCD display unit light being projected a lamp on the projection screen, anomalous signals reception abnormality detection parts that are used to detect received signal, a lamp operation control assembly and a lamp functional unit that is used for operating light under the control of lamp operation control assembly that is used for controlling the operation of lamp according to the signal that receives the reception of abnormality detection parts from signal.

Fig. 1 shows a system diagram according to the lamp operating of first kind of embodiment of the present invention.

Fig. 2 shows a system diagram according to the lamp operating of second kind of embodiment of the present invention.

Fig. 3 A and 3B are the equivalent circuit diagrams of lamp among Fig. 2.

Fig. 4 shows a system diagram according to the lamp operating of the third embodiment of the present invention.

Fig. 5 is the logical table of the energy-saving circuit parts among Fig. 4.

Fig. 6 shows a system diagram according to the lamp operating of the 4th kind of embodiment of the present invention.

Fig. 7 shows the graph of a relation between the input and output of the frequency/voltage converting member in Fig. 6.

Fig. 8 shows the detailed system figure according to a lamp of the present invention and a lamp functional unit.

Fig. 9 A to 9F illustrates the oscillogram of each parts when operation among Fig. 8.

A kind of lamp operating that is used for projection type LCD (LCD) projector according to an embodiment of the invention comprises: a lamp, a lamp functional unit, a detection part and a lamp operation control assembly.

Lamp projects light on the projection screen by a LCD display unit, and lamp functional unit operating light under the control of lamp operation control assembly.

Detection part detects the brightness of projection screen by means of ambient illumination, detects unusual that the reception of vision signal and synchronizing signal and signal receive simultaneously, and these detection signals are offered lamp operation control assembly.

Lamp operation control assembly is controlled the lamp functional unit according to the signal that receives from detection part.

As shown in fig. 1, a kind of lamp operating that is used for projection type LCD projector according to first kind of embodiment of the present invention comprises: a lamp 31, a lamp functional unit 30, an illumination condition detection part 10 and a lamp operation control assembly 20, the output of lamp is controlled in the brightness that depends on ambient illumination thus, so that the brightness of control projected light under the situation of illumination dark around, to save energy.

Lamp 31 is incident upon light on the projection screen by a LCD display unit, and lamp functional unit 30 comprises four on- off elements 32,33,34 and 35, these four on-off elements are converted under the control of lamp operation control assembly 20 for operating light, control lamp thus.

Illumination condition detection part 10 comprises: an optical sensing part 11, and it is used for the brightness of sensing projection screen; A voltage buffer unit 12, it is used to cushion and amplify the signal that receives from optical sensing part 11; A voltage/current converting member 14, it is used for the voltage transitions that receives from voltage buffer unit 12 is become electric current; Light source clamp parts 13, it is used for the voltage clamp that receives from voltage buffer unit 12, so that the output of voltage/current converting member 14 is controlled within the scope of voltage and current permission of lamp; With current buffering parts 15, it is used for current buffering and amplification from 14 receptions of voltage/current converting member, and this electric current offered lamp operation control assembly 20, detect the brightness of the projection screen that the brightness that depends on ambient illumination changes thus, and control lamp operation control assembly 20.

Here, optical sensing part 11 comprises a light receiving element, and it is used for the brightness of sensing projection screen, and it is converted to an electric signal.

Voltage buffer unit 12 comprises: a transistor Q2, the base stage of this transistor Q2 is connected with an output terminal of optical sensing part 11, its collector is connected with power supply by resistance R 4, and its emitter is connected with voltage/current converting member 14 with light source clamp parts 13 by resistance R 5; With a transistor Q3, the base stage of this transistor Q3 is connected with an output terminal of optical sensing part 11, and its collector is connected with ground, and its emitter is connected with the emitter of transistor Q2.

Voltage/current converting member 14 comprises: an operational amplifier A 1, and it is used for the comparison according to the output voltage of voltage buffer unit and a reference voltage, utilizes the linear characteristic of voltage and current, and the output voltage of voltage buffer unit 12 is converted to electric current; Resistance R 8 and R11, they are used for determining the amplification coefficient of operational amplifier A 1; Resistance R 9 and R10, they are used to be provided with the reference voltage of this operational amplifier A 1; With a transistor Q4, the base stage of this transistor Q4 is connected with the output terminal of operational amplifier A 1, its collector is connected with power supply by resistance R 13, its emitter is connected with ground by resistance R 12, this transistor Q4 offers current buffering parts 15 to the electric current that receives from operational amplifier A 1 as a switch.

Light source clamp parts 13 comprise: a diode D2, and the anode of this diode D2 is connected with the output terminal of voltage buffer unit 12 by resistance R 5, and it is used for being switched on when the output of voltage buffer unit 12 surpasses a definite voltage; Resistance R 6 and R7, their common point is connected with the negative electrode of diode D2, and their other end is connected with power supply with ground respectively, and they are used to be provided with clamp and add to voltage on the diode D2.

Current buffering parts 15 comprise an operational amplifier A 2, are used to cushion and amplify the electric current that receives from voltage/current converting member 14, and it is offered lamp operation control assembly 20.

Lamp operation control assembly 20 comprises: an error amplifier 21, and it is used for according to the input voltage of lamp 31 and electric current are produced an error amount with comparing from the signal of illumination condition detection part 10 receptions; A pulse-length modulation control assembly 22, it is used to utilize the voltage that receives from error amplifier 21 to produce a control signal with pulse-length modulation; Lamp input voltage regulation parts 23, it is used for regulating the startup of lamp and moving needed lamp input voltage according to the control signal that receives from pulse-length modulation control assembly 22; A lamp input voltage detection part 24, it is used to detect the lamp input voltage that receives from lamp input voltage regulation parts 23 and this voltage is offered error amplifier 21; With a lamp current detection part 25, it is used for detecting the electric current that flows through lamp when lamp moves, and this electric current offered error amplifier 21, respond the signal that receives from illumination condition detection part 10 thus and control lamp functional unit 30, so that control the luminous of this lamp.

Here, lamp input voltage regulation parts 23 comprise: a transistor Q1, and this transistor Q1 has an input voltage vin, and the output that it is used for response pulse duration modulation control assembly 22 is converted; A diode D1, its negative electrode is connected with transistor Q1, a coil L1 who is connected with transistor Q1; With a capacitor C1 who is connected with the negative electrode of coil L1 and diode D1.

Lamp input voltage detection part 24 comprises resistance R 1 and R2, and the common port of resistance R 1 and R2 is connected with error amplifier 21, and their other end is connected in series with the two ends of the capacitor C1 of lamp input voltage regulation parts 23 respectively.

Lamp current detection part 25 comprises a resistance R 3 that is connected with lamp functional unit 30.

Operation at the lamp operating of this projection type LCD projector of will explaining with aforementioned system.

When applying voltage Vin, error amplifier 21 provides voltage to pulse-length modulation control assembly 22, and this pulse-length modulation control assembly 22 produces a control signal with modulation pulsewidth, and the transistor Q1 of conversion lamp input voltage regulation parts 23.

The voltage Vin that rectification circuit is supplied with in switching manipulation by transistor Q1 at diode D1 by rectification, filtered on capacitor C1 through coil L1, offer lamp functional unit 30 then, and be provided for lamp 31, and operating light 31 by the on-off element 32,33,34 of lamp functional unit 30 and 35 switching manipulation.

Simultaneously, lamp input voltage detection part 24, detect the lamp input voltage that receives from lamp input voltage regulation parts 23 by resistance R 1 and R2, and feed back to error amplifier 21, and lamp current detection part 25 detects because the electric current of the start-up operation flowing through lamps 31 of lamp 31, and this electric current is offered error amplifier 21.

At this moment, error amplifier 21 is supplying with pulse-length modulation control assembly 22 from the voltage and current of lamp input voltage detection part 24 and 25 receptions of lamp current detection part respectively, pulse-length modulation control assembly 22 produces the control signal with width modulation, and the transistor Q1 of lamp input voltage regulation parts 23 is changed, the voltage that rectification circuit is supplied with in switching manipulation by transistor Q1 by diode D1 by rectification, filtered on capacitor C1 through coil L1, supply with lamp functional unit 30 then, make the on-off element 32 of lamp functional unit 30 by the output of lamp input voltage regulation parts 23,33,34 and 35 conversions, last operation lamp 31.

At this moment, the light receiving element of optical sensing part 11 detects the brightness of the ambient lighting around projection type LCD projector, and this detection signal is converted to a magnitude of voltage, and this magnitude of voltage is offered the transistor Q2 and the Q3 of voltage buffer unit 12, the voltage that the transistor Q2 of voltage buffer unit 12 and Q3 buffering and amplification are provided by light receiving element, and will offer the operational amplifier A 1 of voltage/current converting member 14 through the voltage of buffering and amplification.Transistor Q2 and Q3 by voltage buffer unit 12 pass through the voltage that resistance R 5 provides, on the operational amplifier A 1 of voltage/current converting member 14, compare with the reference voltage that is provided with by resistance R 9 and R10, and be exaggerated the enlargement factor of determining by resistance R 8 and R11, switch work by transistor Q4 becomes electric current to the voltage transformation through amplification then, and this electric current is provided for the operational amplifier A 2 of current buffering parts 15.At this moment, if surpassed the allowed band that can make lamp 31 work from the voltage of transistor Q2 and Q3 process resistance R 5 service voltages/current transfer means 14, pass through the conducting work of the diode D2 of light source clamp parts 13 so, can be controlled at the output of voltage/current converting member 14 within the scope that the voltage and current of lamp 31 allows, promptly, make voltage by clamp by the voltage difference that is added on the diode D2 according to the voltage that is provided with by resistance R 6 and R7.

Simultaneously, the operational amplifier A 2 of current buffering parts 15 is the current buffering and the amplification that receive from voltage/current converting member 14, and supplying with error amplifier 21, so that make the value of the brightness variation that depends on the ambient illumination that detects by optical sensing part 11 be fed back to the control section of lamp 31 through buffering and amplified current.

That is to say, if use the ambient illumination of the position of projection type LCD projector to become bright more, value detected and that be converted into voltage becomes big more on optical sensing part 11 so, also just make the electrorheological must be big more through superpotential buffer unit 12 and voltage/current converting member 14 supplying electric current buffer units 15, current buffering parts 15 provide bigger electric current for error amplifier 21, and error amplifier 21 for lamp 31 provides bigger electric current, makes the output rising De Genggao of lamp 31 by lamp operation control assembly 20.

With above-mentioned opposite, if the ambient illumination in the position of using projection type LCD projector becomes dark more, value detected and that be converted into voltage becomes more little on optical sensing part 11 so, it also makes the electrorheological by voltage buffer unit 12 and voltage/current converting member 14 supplying electric current buffer units 15 must be more little, current buffering parts 15 provide littler electric current for error amplifier 21, error amplifier 21, makes under the output of lamp 31 to be even lower for lamp 31 provides littler electric current by lamp operation control assembly 20.

Therefore, the operating means that is used for projection type LCD projector can make image and literal can recognize on projection screen automatically, even also can not have any problem in bright position, because the coupling that the brightness of projection screen can be suitable with the brightness of ambient illumination; And even in the position of dark, can reduce the fatigue of eyes significantly because the suitable brightness of projection screen can be guaranteed.

As shown in FIG. 2, a kind of lamp operating that is used for projection type LCD projector according to second kind of embodiment of the present invention comprises: a lamp 130, a lamp functional unit 120, a received signal detection part 100, with a lamp operation control assembly 110, thus this lamp operating is arranged on a kind of power save mode, because it depends on the signal that is received, be the output that vision signal and synchronizing signal are controlled lamp, so this lamp operating can reduce the life-span that energy loss also can prolong lamp.

Lamp 130 projects light on the projection screen by a LCD display unit.

Received signal detection part 100 comprises: one or an OR101, and vision signal and synchronizing signal logic that it is used for being received are sued for peace; A transistor Q101, it be used to respond from or the signal that receives of door OR101 be converted; With a relay R Y101, it is used for regulating according to the switching manipulation of transistor Q101 the working current of lamp, detects the reception condition of vision signal and synchronizing signal thus.

Lamp operation control assembly 110 comprises: a DC/DC voltage conversion unit, and it is used for can making the level conversion of the direct supply that adds one-tenth a level of lamp work; A lamp working current limiting part 118, it is used under the control of received signal detection part 100, limits the lamp working current of supplying with lamp functional unit 120 from the DC/DC voltage conversion unit; Current/voltage-converted parts 117 of an electricity, it is used to detect the electric current of supplying with lamp functional unit 120 from lamp working current limiting part 118, and this current conversion is become voltage; A voltage and current detection part 115, it is used to respond the signal that receives from current/voltage-converted parts 117, produces the signal corresponding with the voltage and current of supplying with lamp; An error voltage detection part 113, it is used for the voltage that receives from the DC/DC voltage conversion unit is compared with a reference voltage; A pulse-length modulation control assembly, it is used to respond the signal from voltage and current detection part 115 and 113 receptions of error voltage detection part, produces the control signal with width modulation, so that the operation of control DC/DC voltage conversion unit.The work of lamp is controlled in 110 responses of lamp operation control assembly from the signal of received signal detection part 100 receptions like this.

Here, the DC/DC voltage conversion unit comprises: the DC/DC voltage conversion unit 111 of a step-down, and the control signal with width modulation that it is used to respond from the reception of pulse-length modulation control assembly comes the level of the DC power supply that adds is reduced to the level of the operating voltage of lamp; With the DC/DC voltage conversion unit 112 that boosts, it is used to respond the control signal with width modulation that receives from the pulse-length modulation control assembly comes the level of the voltage that receives from step-down DC/DC voltage conversion unit 111 is improved, so that the supply lamp functional unit 120 of the voltage constant that receives from step-down DC/DC voltage conversion unit 111.

Simultaneously, the pulse-length modulation control assembly comprises: a Pwm controller 114, it is used to respond the signal that receives from error voltage detection part 113 and produces the control signal with width modulation, the operation of DC/DC voltage conversion unit 112 so that control is boosted; With a Pwm controller 116, it is used to respond the signal that receives from voltage and current detection part 115, produces the control signal with width modulation, so that the operation of control step-down DC/DC voltage conversion unit 111.

Lamp working current limiting part 118 comprises: one one resistance R 103 that end is connected with the output terminal of the DC/DC voltage conversion unit 112 that boosts; One one end is connected with the other end of resistance R 103, the resistance R 104 that the other end is connected with the input end of lamp functional unit 120; With a relay switch RY102, the two ends of this relay switch are connected with the two ends of resistance R 104, so as under the control of received signal detection part 100 by switch.

Lamp functional unit 120 comprises the on-off element of two groups of push-pull type work, and the working power that their responses are supplied with by lamp operation control assembly 110 is connected lamp 130, and makes lamp 130 work under the control of lamp operation control assembly 110.

The lamp operating that is used for projection type LCD projector with second kind of embodiment of the present invention of said system is with reference to Fig. 2 and 3A, the 3B explanation that makes an explanation.

The direct supply Vdc that supplies with step-down DC/DC voltage conversion unit 111 be converted into have one with direct supply from the corresponding voltage of pulse-width modulation control signal of Pwm controller 116 receptions.

At this moment, one group of on-off element of lamp functional unit 120 is energized, and make working current flowing through lamps 130 and lamp 130 is connected, and another group on-off element of lamp functional unit 120 is energized, make working current continue flowing through lamps 130, and keep the illumination condition of lamp 130.

At this moment, if the operating voltage of supply lamp functional unit 120 of utilizing a resistance detection on error voltage detection part 113 is greater than reference voltage, that is to say, be higher than reference voltage if supply with the operating voltage of lamp, corresponding with it the so voltage from 113 outputs of error voltage detection part is lowered, response makes pulse width than wideer in the past from the pulse width modulation control signal that Pwm controller 114 receives, and the light working voltage of supplying with lamp functional unit 120 is even lower.

With above-mentioned opposite, be lower than reference voltage if supply with the operating voltage of lamp functional unit 120, that is to say, the operating voltage of supplying with lamp is lower than reference voltage, corresponding with it the so voltage by 113 outputs of error voltage detection part is enhanced, the pulse width modulation control signal that response receives from Pwm controller 114 make pulse width than before pulse width narrower, thereby make bigger that the light working voltage of supplying with lamp functional unit 120 is enhanced.

Therefore, if additional power source is changed, so by a kind of like this voltage compensation path of flowing through, light working voltage always can be maintained on the constant level.

Simultaneously, from the operational amplifier OP101 of boost DC/DC voltage conversion unit 112 service voltages and current detecting part 115, to detect the lamp input voltage; The working current of supplying with lamp functional unit 120 by resistance R 104 converts voltage to by current/voltage-converted parts 117, and the operational amplifier OP102 of service voltage and current detecting part 115, to detect the lamp working current, is compared respectively and amplification at this.

Therefore, because it is processed in operational amplifier OP101 and OP102, and the voltage that is converted into pulse-width modulation control signal in Pwm controller 116 changed pulse width, and the result can be fixed on the level of a hope from the voltage of the electric current of step-down DC/DC voltage conversion unit 111 outputs.

In a word, for a stabilized power source is provided to lamp, need be fixed to the lamp working current and also suitably control this electric current on the constant level, for this purpose, as being explained, light working voltage is by error voltage detection part 113, Pwm controller 114 is fixed to a steady state value with boosting DC/DC voltage conversion unit 112, and suitably controls the variable quantity of supplying with the voltage and current of lamps by current/voltage-converted parts 117 and voltage and current detection part 115.

Simultaneously, lamp functional unit 120 depends on the existence that signal receives, the reception of promptly any vision signal and any synchronizing signal, and be in the running current state that receives, or be in a kind of power save mode, will be explained below.

At first, according to signal, i.e. the reception of vision signal or synchronizing signal, from or the high level that comes of door OR101 be cushioned and supply with the base stage of transistor Q101 at impact damper B102 by resistance R 101, make transistor Q101 conducting.By this, because relay R Y101 is energized, make the relay switch RY102 closure of lamp working current limiting part 118, the two ends of resistance R 104 are by short circuit.According to this situation, a normal level working current can flow through lamp functional unit 120 through resistance R 103.

Yet, if do not receive any signal, just both there be not vision signal not have synchronizing signal yet, end under a low level effect owing to transistor Q101 so, thereby relay R Y101 is opened circuit and the relay switch RY102 of the working current limiting part 118 that turns on the light, again the working current of supplying with lamp functional unit 120 is restricted to a grade corresponding with the value of resistance R 104, makes lamp functional unit 120 enter into a kind of power save mode thus.

For example, if hypothesis modulating voltage V _LampBe 80V, lamp current I _LampBe 1.875A, the resistance R of lamp _LampResistance R103+R with resistance R 103 _LampBe 43,, relay R Y101 be opened, because the power equivalent electrical circuit of lamp is as shown in Fig. 3 A, so lamp working current I if, just, do not have the reception of vision signal Vin and synchronizing signal Sync owing to there is not the reception of signal _Lamp=80/ (43+10)=1.5A, the power W of lamp _Lamp=120W.

Yet, if there is signal to receive, just receive vision signal Vin and synchronizing signal Sync, make relay R Y102 closure, so since the power equivalent electrical circuit of lamp as shown in Fig. 3 B, so lamp working current I _Lamp=80/43=1.875A, the power W of lamp _Lamp=150W.

As shown in FIG. 4, according to the third embodiment of the present invention, the lamp operating that is used for a kind of projection type LCD projector is at lamp operating shown in Figure 2, add an energy-saving circuit 140 again, this circuit is used for cutting off the lamp working current when a preset time end cycle, and when not receiving vision signal and synchronizing signal, under the control of received signal detection part, little by little reduce the lamp working current.

Energy-saving circuit parts 140 comprise: step-by-step counting parts 141, and it is used under the control of received signal detection part 100, carrying out counting operation when not having vision signal and synchronizing signal to be received; A demoder 142, it is used for the count value decoding of pulse count parts 141; A D/A converter 143, it is used for the output of demoder 142 is converted to a simulating signal; A lamp working current control assembly 144, it is used for little by little reducing to supply with according to the output of D/A converter 143 the lamp working current of lamp functional unit 120; Cut off parts 145 with a lamp working current, it is used for when the count value of step-by-step counting parts 141 has reached a predetermined value, comes the lamp working current of sever supply lamp functional unit 120 by control lamp working current control assembly 144.

Here, step-by-step counting parts 141 comprise: a phase inverter INV141, and it is used for the signal inversion from received signal detection part 100; A switch SW 141, it is used for being converted according to the output valve of phase inverter INV141; With an impulse meter C141, it is used for counting according to the switching manipulation of switch SW 141.

Lamp working current control assembly 144 comprises: the resistance R 141 and the R142 that are connected with the output terminal of D/A converter 143; An operational amplifier OP141 who is connected with the output terminal of D/A converter 143; The resistance R 143 that two ends are connected with input end with the output terminal of operational amplifier OP141 respectively; With a transistor Q141, the base stage of this transistor Q141 is connected with resistance R 143, its emitter passes through resistance R 144 and lamp working current cut-out parts 145 are connected, its collector is connected with lamp functional unit 120.

The lamp working current cuts off parts 145 and comprises: a phase inverter INV142, and it is used for the output of pulse counter C141 anti-phase; One with a door AND141, it is used to produce the logic product of another output of the output of phase inverter INV142 and impulse meter C141; With a transistor Q142, its base stage is connected with output terminal with door AND141, and its collector is connected with resistance 143, and its emitter is connected with resistance R 144.

To explain the below work of lamp operating shown in Figure 4 with said system.

Under normal condition, just when receiving vision signal Vin or synchronizing signal Sync, owing to utilize received signal detection part 100 that switch SW 141 is opened, make power supply can not offer impulse meter C141, so demoder 142 and D/A converter 143 comprise that impulse meter C141 is inoperable, make the voltage on the base stage of passing through operational amplifier OP141 and resistance R 143 supply transistor Q141 on the node of resistance R 141 and R142 be enough to make transistor Q141 conducting, it will supply with lamp functional unit 120 to normal current by transistor Q141 and resistance R 144.

Yet, when not receiving vision signal Vin or synchronizing signal Sync, owing to utilize received signal detection part 100 to make switch SW 141 closures, power supply is provided for impulse meter C141, so impulse meter C141 begins counting, this count value converts simulating signal to by demoder 142 and D/A converter 143, and is provided for the non-oppisite phase end of operational amplifier OP141.As shown in FIG. 5, because As time goes on, voltage of signals descends, so the electric current of the transistor Q141 that flows through, just the lamp working current little by little reduces.

At this moment, since one of impulse meter C141 output B offer that the lamp working current cuts off parts 145 with door AND141, and the output C of impulse meter C141 offers and door AND141 after anti-phase through phase inverter INV142, as shown in FIG. 5, when through 20 minutes, make transistor Q142 conducting from high level with door AND141 output, suppressed to supply with the voltage of the base stage of transistor Q141, fully turn-offed transistor Q141, the lamp working current of therefore supplying with lamp functional unit 120 is fully cut off.

As shown in FIG. 6, a kind of lamp operating that is used for projection type LCD projector according to the 4th kind of embodiment of the present invention comprises: a lamp 230, one receive abnormality detection parts 200 ', a lamp operation control assembly 210, with a lamp functional unit 220, therefore when not receiving any signal maybe when receiving abnormal signal, can prevent that lamp is switched on, abnormal signal described here for example is: even receive signal, but the frequency of this received signal is different from the frequency of in fact using.

Lamp 230 projects light on the projection screen by a kind of LCD display unit.

Receiving abnormality detection parts 200 comprises: a frequency/voltage converting member 201, and it is used for the frequency inverted of the line synchronizing signal that receives is become voltage; A frequency limits detection part 202, it is used to detect the voltage that receives from frequency/voltage converting member 201 whether between the upper and lower bound of voltage to frequency; With counting generation/time delay parts 203, it is used for producing a count signal according to the signal that receives from frequency limits detection part 202, and after this count signal is postponed a predetermined period of time, offer lamp operation control assembly 210, detect unusual received signal thus.

Here, frequency/voltage converting member 201 comprises: a capacitor C201 who is connected with an input end that is added with synchronizing signal; A frequency 206 that is connected with capacitor C201; A resistance R 202 that is connected with frequency 206; With a capacitor C203 who is connected with ground with resistance R 202.

Frequency limits detection part 202 comprises: a comparer IC201, and it is used for the voltage that receives from frequency/voltage converting member 201 is compared with a upper limiting frequency voltage; A comparer IC202, it is used for the voltage that receives from frequency/voltage converting member 201 is compared with a lower frequency limit voltage; With one or an OR201, it is used for the signal logic summation from comparer IC201 and IC202 reception, and it is offered lamp operation control assembly 210 and counting generation/time delay parts 203.

Counting generations/time delay parts 203 comprise: a counting generator 205, it be used for according to frequency limits detection part 202 or an OR201 export and produce count signal; A time delay device 204, it is used for the count signal that receives from counting generator 205 is postponed; A three-state buffer IC203 (three phase buffer) is connected with output terminal frequency limits detection part 202 or door OR201, and it is used for being triggered according to the output of time delay device 204; A resistance R 206, the one end is connected with the output terminal of three-state buffer IC203; A capacitor C204 is connected with ground with the other end of resistance R 206; Resistance R 207, one ends are connected with the other end of resistance R 206, and the other end is connected with lamp received signal detection part 211; A resistance R 208, two ends are connected with ground with the other end of resistance R 207 respectively.

Lamp operation control assembly 210 comprises: a modulating voltage detection part 213, and it is used to detect the voltage of supplying with lamp 230; A lamp received signal detection part 211, it is used for detecting a lamp received signal according to the signal from counting generation/ time delay parts 203 and 213 receptions of modulating voltage detection part, so that the operation of control lamp functional unit 220; With a lamp control assembly 212, it is used for according to the signal from lamp received signal detection part 211, counting generation/ time delay parts 203 and 202 receptions of frequency limits detection part, control lamp functional unit 220, thus according to the operation of controlling lamp from the signal that receives 200 receptions of abnormality detection parts.

Here, lamp received signal detection part 211 comprises: a comparer IC204, and it is used for the voltage that receives from modulating voltage detection part 213 is compared with a reference voltage; With one and a door AND201, it is used for the signal from the comparer IC204 and resistance R 207 receptions of counting generation/time delay parts 203 is carried out the logic quadrature, and its result is offered lamp control assembly 212.

Lamp control assembly 212 comprises: a thyristor SCR201, and it has the control utmost point of a reception from the signal of the resistance R 207 of counting generation/time delay parts 203, is used to receive from signal frequency limits detection part 202 or that door OR201 comes; With one or an OR202, it is used for suing for peace the signal that receives from thyristor SCR201 with from the signal logic with door AND201 reception of lamp received signal detection part 211, and its result is offered lamp functional unit 220.

Lamp functional unit 220 is operating light 230 under the control of lamp operation control assembly 210.

Below with reference to will the explain work of lamp operating of Fig. 7 with said apparatus.

The synchronizing signal of the vision signal that receives by signal receiving end is converted into a voltage corresponding to the frequency in frequency/voltage converting member 201, described frequency/voltage converting member 201 has frequency 206, resistance R 201 and R202, capacitor C201, C202 and C203, and this synchronizing signal is a signal within upper frequency limit and lower limit being detected as on the frequency limits detection part 202.

That is to say that the frequency of the line synchronizing signal that receives and frequency be corresponding to be converted into a voltage, offers frequency limits detection part 202.The voltage that receives from frequency/voltage converting member 201 offers the non-inverting input of comparer IC201 of frequency limits detection part 202 and the reverse input end of comparer IC202, and compares with the reference voltage of these two comparers respectively.

For the handle voltage V2 corresponding with upper limiting frequency f2 offers the backward end of comparer IC201, resistance R 203 is connected between a power Vcc and the backward end, and an end of resistance R 204 also is connected with this backward end.For the handle voltage V1 corresponding with lower frequency limit f1 offers the non-return end of comparer IC202, the other end of resistance R 204 is connected with this non-anti-end, and resistance R 205 is connected between this non-return end and the ground.

That is to say, the frequency of the line synchronizing signal that is received on frequency/voltage converting member 201 is converted into a relevant voltage, offer the non-return end of comparer IC201 of frequency limits detection part 202 and the backward end of comparer IC202 respectively, and in these two comparers, compare respectively with corresponding to the voltage V2 of upper limiting frequency f2 and the voltage V1 of corresponding lower frequency limit f1, and or door OR201 on logic summation.

For example, shown in Fig. 7, if the frequency of the line synchronizing signal that is received is a particular frequencies f0 among bound frequency f 1 and f2, be converted into a corresponding voltage V0 and be provided for the non-return end of comparer IC201 of frequency limits detection part 202 and the backward end of comparer IC202 respectively, and in these two comparers, compare with the voltage V2 of a corresponding upper limiting frequency f2 and the voltage V1 of a corresponding lower frequency limit f1 respectively, and or door OR201 on logic summation.

At this moment, because the frequency f 0 of received line synchronizing signal is within bound frequency f 1 and f2, so the output of comparer IC201 and IC202 is low level state, this just makes or the output of door OR201 also is at a kind of low level state, this low level state can not make the counting generator 205 of counting generations/time delay parts 203 start, so lamp functional unit 220 is unaffected and normally operate.

Yet, as shown in FIG. 7, if the frequency of received line synchronizing signal is not a particular frequencies f0 among bound frequency f 1 and f2, be provided for non-return end and the comparer IC202 backward end of the comparer IC201 of frequency limits detection part 202 respectively by the voltage of this frequency inverted one-tenth, and in these two comparers, compare with the voltage V2 of a corresponding upper limiting frequency f2 and the voltage V1 of a corresponding lower frequency limit f1 respectively, then or door OR201 on logically summation, but at this moment output also is in low level state.

That is to say, if the frequency of the line synchronizing signal that is received greater than upper limiting frequency f2, the signal of a high level state of comparer IC201 output so; If the frequency of the line synchronizing signal that is received is lower than lower frequency limit f1, comparer IC202 exports the signal of a high level state so.If the frequency of the synchronizing signal that is received is outside the scope of bound frequency, so or the output of door OR201 be a kind of high level state, therefore make counting generator 205 startups of counting generations/time delay parts 203 produce a count signal.

The count signal of counting generator 205 outputs is delayed on time delay device 204 on demand, and triggers three-state buffer IC203.

For example, in case this three-state buffer IC203 is triggered, pass through this three-state buffer IC203 from above-mentioned high level signal frequency limits detection part 202 or that door OR201 comes, through resistance R 206, R207, R208 and capacitor C204, offer the control utmost point of thyristor SCR201, so that trigger thyristor SCR201.

When this thyristor SCR201 is triggered and is operated, since from high level state signal frequency limits detection part 202 or that door OR201 comes through thyristor SCR201 and or a door OR202 offer lamp functional unit 220, and lamp functional unit 220 is turn-offed, institute so that lamp 230 disconnect.

Were it not for line synchronizing signal is received, situation when it is similar to frequency when line synchronizing signal and is not a particular frequencies f0 who is positioned among bound frequency f 1 and the f2 so, since from or the signal of having been sued for peace by logic that comes of door OR201 be a high level state, as being explained, so lamp 230 is not switched on.

At normal operation period; if the line synchronizing signal that receives unusual or move undesired; frequency limits detection part 202 produces the signal of a high level state so; if also do not receive normal line synchronizing signal through a preset time cycle, the signal of a high level state of counting generations/time delay parts 203 generations so.Voltage at the lamp 230 that detects on the modulating voltage detection part 213 is compared with reference voltage on comparer IC204, and therefore, if find it is normal, this comparer IC204 produces the signal of a high level state so.

The signal of the high level state that comes from counting generations/time delay parts 203 and comparer IC204 lamp received signal detection part 211 with door AND201 on by logically quadrature, and offer signal lamp control assembly 212 or a high level state of OR202.

Therefore since or the signal of the high level state that produces on the OR202 of door be provided for lamp functional unit 220, lamp functional unit 220 is turn-offed, so lamp 230 is disconnected.

As shown in FIG. 8, comprise two alternately operated high-pressure discharge lamps 306 and 307 according to the lamp of the lamp operating that is used for projection type LCD projector of the present invention and the preferred embodiment of lamp functional unit, thereby alternately start and these two high-pressure discharge lamps 306 and 307 of conducting, be shortened so that prevent the serviceable life of lamp, even and high-pressure discharge lamp 306 and 307 also can reduce the starting failure rate when repeatedly being started and restarting.

Here, as shown in Figure 8, operating high-pressure discharge lamp 306 and 307 lamp functional unit comprise: a power supply detects pulse production part 300, and it is used to detect the reception of power supply and produces a pulse signal; A lamp starting unit 301, it is used to respond from power supply detects the pulse signal that pulse production part 300 receives, starting high-pressure discharge lamps 306 and 307 selectively under the situation that has power supply to receive; Inverter parts 305, it is used for the high-pressure discharge lamp 306 and 307 by 301 startings of lamp starting unit is maintained conducting state continuously; Vibration and functional unit 304, it is used for vibration and operation inverter parts 305; A time clock production part 302, it is used to respond the pulse signal that receives from power supply detection pulse production part 300 and produces a time clock; Select control assembly 303 with a starting, it is used for controlling lamp starting unit 301 according to the signal that receives from time clock production part 302, so that starting high-pressure discharge lamps 306 and 307 selectively.

At this, power supply detects pulse production part 300 and comprises: a Power supply detector 310, it is used for determining power supply B ⁺Reception; A capacitor C301 who is connected with Power supply detector 310; With the resistance R 301 and the R302 that are connected with Power supply detector 310.

Lamp starting unit 301 comprises: a transistor Q301, and its base stage is connected with the output terminal that power supply detects pulse production part 300, and it is used for being switched under the situation of the reception that detects power supply; A capacitor C302 who is connected with the collector of transistor Q301; The two-way thyristor SD301 and the SD302 that are connected with capacitor C302; The transformer T301 that primary coil T301a is connected with the collector of two-way thyristor SD301, SD302 and transistor Q301; Diode D301 and D302 that anode is connected with T301C with the secondary coil T301b of transformer T301 respectively; Capacitor C303 and C304 that each is connected with T301c with the secondary coil T301b of the negative electrode of diode D301 and D302 and transformer T301 respectively; An auxiliary discharge bulb SG301 who is connected with the secondary coil of transformer T301; A relay switch RYS301 who is connected with the negative electrode of diode D301; A relay switch RYS302 who is connected with the negative electrode of diode D302; A transformer T302, its primary coil T302a and T302b respectively with relay switch RYS301, RYS302 is connected with auxiliary discharge bulb SG301, its secondary coil T302c is connected with 307 with high-pressure discharge lamp 306 respectively with T302d; With a resistance R 303 that is connected with capacitor C302, when receiving power supply, this lamp starting unit 301 is by alternately sensing on the secondary coil T302c of transformer T302 and the T302d starting high-pressure discharge lamps 306 and 307 selectively to a high voltage.

Inverter parts 305 comprise four transistor Q302, Q303, Q304 and Q305 that alternately are switched in pairs and end, they are used for the high-pressure discharge lamp 306 and 307 by 301 startings of lamp starting unit is maintained under the state of a conducting, and for they alternately being switched in couples and ending, vibration is connected with the base stage of functional unit 304 with four transistor Q302, Q303, Q304 and Q305.

Time clock production part 302 comprises: one one end and power supply B ⁺The resistance R 304 that connects; A capacitor C305 who is connected with ground with the other end of resistance R 304; One one resistance R 305 that end is connected with the other end of resistance R 304; A resistance R 306 that is connected with ground with the other end of resistance R 305; With a thyristor SCR301, it has a control utmost point that is connected with the other end of resistance R 305, and with power supply B ⁺Select control assembly 303 to be connected with starting.

Starting selects control assembly 303 to comprise: a trigger 311, and its input end of clock is connected with the thyristor SCR301 of time clock production part 302; One one resistance R 307 that end is connected with an output terminal of trigger 311; A resistance R 308 that is connected with ground with the other end of resistance R 307; A transistor Q306, its base stage is connected with the other end of resistance R 307, and its emitter is connected with ground; With a collector and a power supply B with transistor Q306 ⁺The relay R Y301 that connects, this starting selects control assembly 303 to be used to control the relay switch RYS301 and the RYS302 of lamp starting unit 301.

Below with reference to the work of Fig. 9 A to 9F detailed description according to the 4th kind of embodiment of lamp operating of the present invention.

As shown in Fig. 9 A, under the condition that ready-made power supply Vsd is provided, when in order to connect high-pressure discharge lamp 306 and 307 and when connecting a power switch, the power supply Vdc of 280V and power supply B ⁺Be provided.Owing to detect the resistance R 301 of pulse production part 300 and the additional power source B of R302 dividing potential drop by power supply ⁺Offer Power supply detector 310, so Power supply detector 310 detects the power supply B that applies ⁺, and as shown in Fig. 9 B, its is being postponed a power supply of exporting a low-voltage by capacitor C301 preset time after at interval.

At this moment, in the initial time before the time delay that is provided with by capacitor, high voltage of Power supply detector 310 outputs, this high voltage is provided for the base stage of the transistor Q301 of lamp starting unit 301, makes transistor Q301 conducting.

Like this, when transistor Q301 conducting, resistance R 303 and capacitor C302 by lamp starting unit 301 produce vibration, and oscillating voltage makes two-way thyristor SD301 and SD302 conducting and ends, this oscillating voltage offers the primary coil T301a of transformer T301, approximately on the sensed secondary coil T301b of pulse voltage and T301C of 3KV.

Sense secondary coil T301b and the pulse voltage on the T301c of transformer T301 and pass through diode D301 and D302 respectively by rectification, and filtered by capacitor C303 and C304 respectively.

Since when the resistance R 304 by time clock production part 302 makes capacitor C305 charging, additional power source B ⁺Provide a trigger pip by resistance R 305 for the control utmost point of thyristor SCR301, so thyristor SCR301 conducting.Therefore, as shown in Fig. 9 C, power supply B ⁺Offering starting through thyristor SCR301 selects control assembly 303 to trigger the input end of clock of sending out device 311.

At this, export a high level if suppose trigger 311 by an output terminal/Q, so owing to offer a data input end D of this trigger 311 from the next high level of output terminal/Q, produce under the situation of a clock signal at time clock production part 302, as as shown in Fig. 9 D, trigger 311 is by its high level of an output terminal Q output, and this high voltage makes transistor Q306 conducting.According to this situation, relay R Y301 is driven, and makes relay switch RYS301 closure, and relay switch RYS302 opens.

Subsequently, by diode D301 rectification and by the direct supply of capacitor C303 filtering, primary coil T302a through relay switch RYS301 and transformer T302 offers auxiliary discharge bulb SG301, make this auxiliary discharge bulb SG301 conducting, and only the primary coil T302a of high voltage from transformer T302 sensed on the secondary coil T302c, as as shown in Fig. 9 E, high-pressure discharge lamp 306 is started.Simultaneously, have according to the vibration and the alternating output signal of functional unit 304 be switched on and the inverter parts 305 of the transistor Q302 that ends and Q305 and transistor Q303 and the Q304 high-pressure discharge lamp 306 that started of conducting continuously.

Under the situation of this high-pressure discharge lamp 306 conducting, detect the set time delay of capacitor C301 of pulse production part 300 by power supply when process, during low-voltage of Power supply detector 310 outputs, transistor Q301 ends, and the oscillating operation of lamp starting unit 301 is stopped.

Under the situation that this high-pressure discharge lamp 306 is switched on, if the power cutoff switch makes high-pressure discharge lamp 306 shutoffs so and stops power supply Vdc and B ⁺Supply, if energized once more provides power supply Vdc and B once more ⁺As being illustrated, the high voltage that produces on current detecting pulse production part 300 makes the transistor Q301 conducting of lamp starting unit 301, so that the pulse voltage induced on the secondary coil T301b and T301c of transformer T301, sense pulse voltage on secondary coil T301b and the T301c by diode D301 and D302 by rectification and filtering on capacitor C303 and C304.

Simultaneously, because the clock pulse signal that produces on time clock production part 302 is provided to the input end of clock of trigger 311, offer the data input pin D of trigger 311 from the low level of the output terminal of this trigger 311/Q output, make trigger 311 by low level of output terminal Q output, opposite with above-mentioned explanation, transistor Q306 ends, and relay R Y301 is not driven, make relay switch RYS301 disconnect relay switch RYS302 closure.

Therefore, through diode D302 rectification with through the direct supply of capacitor C304 filtering, only sensed on the secondary coil T302d by the primary coil T302b from relay switch RYS302 and transformer T302, as shown in Fig. 9 F, high-pressure discharge lamp 307 is started.

Simultaneously, have according to vibration and the inverter parts 305 of the alternating output signal ground conducting of functional unit 304 and the transistor Q302 that ends and Q305 and transistor Q303 and the Q304 high-pressure discharge lamp 307 that started of conducting continuously.

Under the situation that this high-pressure discharge lamp 307 has been switched on, detect the set time delay of capacitor C301 of pulse production part 300 by power supply when process, during low-voltage of Power supply detector 301 outputs, transistor Q301 is turned off, and the oscillating operation of lamp starting unit 301 is stopped.

Under the situation that this high-pressure discharge lamp 307 has been switched on, if the power cutoff switch makes high-pressure discharge lamp 307 shutoffs and stops power supply Vdc and B ⁺Supply, and then energized provides power supply Vdc and B once more ⁺Because trigger 311 is exported a high level once more by output terminal Q, transistor Q306 conducting and relay R Y301 are started, and make relay switch RYS301 closure and relay switch RYS302 is opened, high-pressure discharge lamp 306 is switched on once more, if and power switch connection once more after being turned off once more, the conducting of high-pressure discharge lamp 307 is repeated so.

Having the lamp shown in Figure 8 of the said system of operating by said process and the embodiment of lamp functional unit can be applicable in the lamp and lamp functional unit of the lamp operating shown in Fig. 1,2,4 and 6.

As being illustrated, the present invention has following advantage:

The first, owing to can automatically control the brightness of lamp easily according to the brightness of ambient illumination according to the lamp operating that is used for projection type LCD projector of the present invention, so image that shows on projection screen and literal can not recognized not difficultly, even the brightness in a dark place owing to projection screen can suitably be controlled, so can reduce eye fatigue widely, and the work that is used for the lamp operating of projection type LCD projector can not be subjected to the restriction of environmental baseline;

The second, be fixed under the condition of certain limit in power input, stably provide lamp needed rated power by Control current, can reduce power attenuation, and when not receiving vision signal and synchronizing signal, prevent from the loss of power from also can reduce power attenuation by the power that reduces to supply with lamp;

Three, when not receiving line synchronizing signal, even or receive line synchronizing signal, but the frequency of this signal and the actual frequency of using are not simultaneously, by preventing that lamp is switched on the serviceable life that can prolong lamp, also can prevent overheated and abnormal work of lamp, and in when, in this device abnormal occurrence taking place when, because lamp is automatically turn-offed, so can prevent the generation of catching fire;

Four, because this lamp operating has two high-pressure discharge lamps, these two lamps be set be alternately conducting when at every turn applying power supply, even lamp is started and is restarted the serviceable life that does not also shorten lamp, and almost there is not starting failure, owing to can reach the instantaneous lamp of restarting, allow when starting, to watch immediately image.Because in the starting of high-pressure discharge lamp, the starting voltage that offers this circuit continues a preset time cycle, so this circuit is damaged hardly.

Though the present invention illustrates in conjunction with special embodiment, therefore clearly many replacements and modification be can carry out easily by means of above-mentioned explanation for a person skilled in the art, replacement and modification within all spirit and scope that fall into claims the invention is intended to be to comprise.

Claims (31)

1, a kind of lamp operating that is used for projection type LCD (liquid crystal display) projector comprises:

A lamp is used for by a LCD display unit light being projected a projection screen;

A lamp functional unit is used to operate described lamp;

A detection part is used for detecting by ambient illumination the brightness of projection screen, and detects the reception of vision signal and synchronizing signal, and received signals is unusual; With

A control assembly is used for controlling described lamp functional unit according to the signal that receives from described detection part.

2, a kind of lamp operating that is used for projection type LCD (liquid crystal display) projector comprises:

A lamp is used for by a LCD display unit light being projected a projection screen;

An illuminating position detection part is used for detecting by the brightness of ambient illumination the brightness of projection screen;

A lamp operation control assembly is used for controlling according to the signal that receives from described illuminating position detection part the illumination of lamp; With

A lamp functional unit is used for operating light under the control of described lamp operation control assembly.

3, device according to claim 2 is characterized in that: described lamp functional unit comprises four on-off elements that are used for operating light, and they are converted under the control of lamp operation control assembly.

4, device according to claim 2 is characterized in that: described lamp comprises two high-pressure discharge lamps that are used for blocked operation.

5, device according to claim 4 is characterized in that described lamp functional unit comprises:

A power supply detects the pulse production part, is used to detect the reception of power supply and produces a pulse signal;

A lamp starting unit is used for according to detect pulse signal that the pulse production part receives starting high-pressure discharge lamps selectively from described power supply;

Inverter parts are used for the high-pressure discharge lamp by the starting of lamp starting unit is maintained a lasting conducting state;

One vibrates and functional unit, is used for vibration and operates described inverter parts;

A time clock production part is used for producing a time clock according to the pulse signal that detects the reception of pulse production part from described power supply; With

Control assembly is selected in a starting, is used for controlling the lamp starting unit according to the signal that receives from described time clock production part, so that starting high-pressure discharge lamps selectively.

6, device according to claim 2 is characterized in that: described illuminating position detection part comprises:

An optical sensing part is used to detect the brightness of projection screen;

A voltage buffer unit is used for the signal damping and the amplification that receive from described optical sensing part;

A voltage/current converting member is used for the voltage transitions that receives from described voltage buffer unit is become electric current;

Light source clamp parts are used for the voltage clamp that receives from described voltage buffer unit, so that the output of described voltage/current converting member is controlled within the allowed band of voltage and current of lamp; With

Current buffering parts are used for current buffering and amplification from described voltage/current converting member reception, and this electric current is offered described lamp operation control assembly.

7, device according to claim 6 is characterized in that: described optical sensing part comprises a light receiving element, and it is used to detect the brightness of projection screen and it is converted to an electric signal.

8, device according to claim 6 is characterized in that described voltage buffer unit comprises:

A first transistor, this transistor has: the base stage that output terminal is connected with described optical sensing part, a collector that is connected with described power supply is with an emitter that is connected with described voltage/current converting member with described light source clamp parts; With

A transistor seconds, this transistor has: the base stage that output terminal is connected with described optical sensing part, a collector that is connected with ground is with an emitter that is connected with the emitter of described the first transistor.

9, device according to claim 6 is characterized in that described voltage/current converting member comprises:

An operational amplifier is used for comparing with a reference voltage according to the output voltage of described voltage buffer unit, utilizes the linear characteristic of voltage and current, and the output voltage of described voltage buffer unit is converted to electric current;

A plurality of resistance are used for determining the amplification coefficient of described operational amplifier;

A plurality of resistance are used to be provided with the reference voltage of described operational amplifier; With

A transistor, this transistor has: a base stage that is connected with the output terminal of described operational amplifier, it is used for the electric current that receives from described operational amplifier is offered described current buffering parts.

10, device according to claim 6 is characterized in that described light source clamp parts comprise:

A diode, it is used for being switched on when the output of described voltage buffer unit surpasses a definite voltage; With

A plurality of resistance are used to be provided with a reference voltage, and this reference voltage is used to be provided with the voltage that is provided by described diode current flow operation with clamp.

11, according to the device of claim 6, it is characterized in that described current buffering parts comprise an operational amplifier, described operational amplifier is used to cushion and amplify the electric current that receives from described voltage/current converting member, and it is offered described lamp operation control assembly.

12, device according to claim 2 is characterized in that described lamp operation control assembly comprises:

An error amplifier is used for producing an error amount according to the input voltage of lamp and electric current are compared with the signal that receives from described illuminating position detection part;

A pulse-length modulation control assembly is used to utilize the voltage that receives from described error amplifier to produce a control signal with width modulation;

Lamp input voltage regulation parts are used for regulating the starting of lamp and operating needed lamp input voltage according to the control signal from described pulse-length modulation control assembly reception;

A lamp input voltage detection part is used to detect the lamp input voltage that receives from described lamp input voltage regulation parts, and it is offered described error amplifier; With

A lamp current detection part is used for when lamp is worked detecting the electric current of flowing through lamps, and it is offered described error amplifier.

13, a kind of lamp operating that is used for projection type LCD (liquid crystal display) projector comprises:

A lamp is used for by a LCD display unit light being projected a projection screen;

A signal receives detection part, is used to detect the reception of vision signal and synchronizing signal;

A lamp operation control assembly is used for controlling according to the signal that receives the detection part reception from described signal the operation of lamp; With

A lamp functional unit is used for operating light under the control of described lamp operation control assembly.

14, device according to claim 13 is characterized in that: described lamp comprises the high-pressure discharge lamp of two blocked operations.

15, device according to claim 14 is characterized in that described lamp functional unit comprises:

A power supply detects the pulse production part, is used to detect the reception of power supply and produces a pulse signal;

A lamp starting unit is used for according to detect pulse signal that the pulse production part receives starting high-pressure discharge lamps selectively from described power supply;

Inverter parts are used for the high-pressure discharge lamp by described lamp starting unit starting is maintained a continuous conducting state;

One vibrates and functional unit, is used for vibration and operates described inverter parts;

A time clock production part is used for producing a time clock according to the pulse signal that detects the reception of pulse production part from described power supply; With

Control assembly is selected in a starting, is used for controlling the lamp starting unit according to the signal that receives from described time clock production part, so that starting high-pressure discharge lamps selectively.

16, device according to claim 13 is characterized in that described received signal detection part comprises:

One or, be used for the vision signal that received and synchronizing signal are carried out the logic summation;

A transistor is used for according to being converted from signal described or that door receives; With

A relay is used for regulating according to described transistorized conversion operations the operating current of lamp.

17, device according to claim 13 is characterized in that described lamp operation control assembly comprises:

A DC/DC voltage conversion unit, be used for the level conversion that adds the DC power supply become can operating light level;

A lamp working current limiting part is used for supplying with from described DC/DC voltage conversion unit in received signal detection part lower control limit system the working current of the lamp of described lamp functional unit;

Current/voltage-converted parts are used to detect from described lamp working current limiting part and supply with the electric current of lamp functional unit and convert it to voltage;

A voltage and current detection part is used for producing and supplying with according to the signal that receives from the current/voltage-converted parts the corresponding signal of voltage and current of lamp;

An error voltage detection part is used for the voltage that receives from described DC/DC voltage conversion unit is compared with a reference voltage;

A pulse-length modulation control assembly is used for producing a control signal with pulse-length modulation according to the signal from described voltage and current detection part and the reception of error voltage detection part, so that control the operation of described DC/DC voltage conversion unit.

18, device according to claim 17 is characterized in that described DC/DC voltage conversion unit comprises:

A step-down DC/DC voltage conversion unit is used for according to the control signal with width modulation from described pulse-length modulation control assembly reception, but the level that adds the DC power supply is reduced to the level of lamp operating voltage; With

The DC/DC voltage conversion unit that boosts, be used for according to control signal with width modulation from described pulse-length modulation control assembly reception, come the level of the voltage that receives from described step-down DC/DC voltage conversion unit is improved, so that the described lamp functional unit of supply of the voltage constant that receives from step-down DC/DC voltage conversion unit.

19, device according to claim 18 is characterized in that described pulse-length modulation control assembly comprises:

One first Pwm controller is used for producing a control signal with width modulation according to the signal that receives from described error voltage detection part, the operation of DC/DC voltage conversion unit so that control is boosted; With

One second Pwm controller is used for producing a control signal with width modulation according to the signal that receives from described voltage and current detection part, so that the operation of control step-down DC/DC voltage conversion unit.

20, device according to claim 17 is characterized in that described lamp working current limiting part comprises:

One first resistance, its end is connected with the output terminal of the DC/DC voltage conversion unit that boosts;

One second resistance, its end is connected with the other end of described first resistance, and the other end is connected with the input end of lamp functional unit; With

A relay switch is connected with the two ends of second resistance, is used for being converted under the control of described received signal detection part.

21, device according to claim 13 is characterized in that described lamp functional unit comprises two group transistors, and they are used to make lamp to connect according to the operating power push-pull type work that is provided by described lamp operation control assembly.

22, device according to claim 13, it is characterized in that further comprising energy-saving circuit parts, it is used for cutting off the lamp working current during cycle through a preset time, and when not receiving vision signal and synchronizing signal, under the control of described received signal detection part, little by little reduce the lamp working current.

23, device according to claim 22 is characterized in that described energy-saving circuit parts comprise:

Step-by-step counting parts are used under the control of described received signal detection part, when never receiving vision signal and synchronizing signal, and the beginning counting operation;

A demoder is used for the count value decoding to described step-by-step counting parts;

A D/A converter is used for the output of described demoder is converted to simulating signal;

A lamp working current control assembly is used for little by little reducing to supply with according to the output of described D/A converter the lamp working current of described lamp functional unit; With

A lamp working current cuts off parts, is used for when the count value of described step-by-step counting parts has reached a predetermined value, by controlling described lamp working current control assembly, the lamp working current of the complete described lamp functional unit of sever supply.

24, a kind of lamp operating that is used for projection type LCD (liquid crystal display) projector comprises:

A lamp is used for by a LCD display unit light being projected a projection screen;

A signal receives the abnormality detection parts, is used to detect the unusual of received signals;

A lamp operation control assembly is used for controlling according to the signal that receives the reception of abnormality detection parts from described signal the operation of lamp; With

A lamp functional unit is used for operating light under the control of described lamp operation control assembly.

25, device according to claim 24 is characterized in that described lamp comprises the high-pressure discharge lamp of two blocked operations.

26, device according to claim 25 is characterized in that described lamp functional unit comprises:

A power supply detects the pulse production part, is used to detect the reception of power supply and produces a pulse signal;

A lamp starting unit is used for according to detect pulse signal that the pulse production part receives starting high-pressure discharge lamps selectively from described power supply;

Inverter parts are used for the high-pressure discharge lamp by described lamp starting unit starting is maintained a state of connecting continuously;

One vibrates and functional unit, is used for vibration and operates described inverter parts;

A time clock production part is used for producing time clock according to the pulse signal that detects the reception of pulse production part from described power supply; With

Control assembly is selected in a starting, is used for controlling described lamp starting unit according to the signal that receives from described time clock production part, so that starting high-pressure discharge lamps selectively.

27, device according to claim 24 is characterized in that described reception abnormality detection parts comprise:

A frequency/voltage converting member is used for the frequency inverted of the line synchronizing signal that is received is become voltage;

A frequency limits detection part is used to detect the voltage that receives from described frequency/voltage converting member whether between the voltage to frequency bound; With

Counting generation/time delay parts, be used for producing a count signal according to the signal that receives from described frequency limits detection part, and after this count signal is postponed a predetermined period of time, it is offered described lamp operation control assembly.

28, device according to claim 27 is characterized in that described frequency limits detection part comprises:

One first comparer is used for the voltage that receives from described frequency/voltage converting member is compared with a upper limiting frequency voltage;

One second comparer is used for the voltage that receives from described frequency/voltage converting member is compared with a lower frequency limit voltage; With

One or, be used for signal logic summation, and its result offered described lamp operation control assembly and described counting generation/time delay parts receiving from described first and second comparers.

29, device according to claim 27 is characterized in that described lamp operation control assembly comprises:

A modulating voltage detection part is used to detect the voltage that offers lamp,

A lamp received signal detection part is used for detecting a lamp received signal according to the signal from described counting generation/time delay parts and the reception of described modulating voltage detection part, so that control the operation of described lamp functional unit; With

A lamp control assembly is used for controlling described lamp functional unit according to the signal that receives from described lamp received signal detection part, described counting generation/time delay parts and described frequency limits detection part.

30, device according to claim 29 is characterized in that lamp received signal detection part comprises:

A comparer is used for the voltage that receives from described modulating voltage detection part is compared with a reference voltage;

With one with door, be used for the signal that receives from described comparer with from the signal logic quadrature of described counting generations/time delay parts reception, and its result offered described lamp control assembly.

31, device according to claim 29 is characterized in that described lamp control assembly comprises:

A thyristor, it has a reception and produces/the control utmost point of the signal that the time delay parts come from described counting, is used to receive the signal that comes from described frequency limits detection part; With

One or, be used for signal that receives from described thyristor and the signal logic summation that receives from described lamp received signal detection part, and its result offered described lamp functional unit.

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