CN105632456A - Load driving device suitable for driving outdoor display device - Google Patents
Load driving device suitable for driving outdoor display device Download PDFInfo
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- CN105632456A CN105632456A CN201410591571.7A CN201410591571A CN105632456A CN 105632456 A CN105632456 A CN 105632456A CN 201410591571 A CN201410591571 A CN 201410591571A CN 105632456 A CN105632456 A CN 105632456A
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Abstract
A load driving device suitable for driving an outdoor display device comprises a weather sensing line and a display driver, wherein the weather sensing line is configured for sensing the weather state relative to an outdoor display device setting area, thereby providing a sensing voltage signal which changes along with the weather state. The display driver is coupled between the weather sensing line and the outdoor display device and is configured for driving the outdoor display device in reaction to the sensing voltage signal for displaying. When weather state is cloudy, the sensing voltage signal linearly changes in a default voltage range, and furthermore the display brightness of the outdoor display device linearly changes between a highest brightness and a lowest brightness.
Description
Technical field
The invention relates to a kind of load actuation techniques, and be suitable to drive outdoor display and there is the load drive device of (linearly) light modulation effect in particular to one.
Background technology
In recent years, large-scale outdoor display/open air display billboard stands in great numbers/is arranged at the exterior wall of each big building, for dealer's advertisement-printing or transmission message. But, known drive technology corresponding to large-scale outdoor display/open air display billboard is all the drive scheme taking to fix, to such an extent as to the display brightness of large-scale outdoor display/open air display billboard be fine day/daytime or cloudy day/evening is all equally strong, so this phenomenon not only can bring serious light evil problem, and the potential of person travels danger to will also result in nighttime driving.
Summary of the invention
It is an object of the invention to provide one to be suitable to drive outdoor display and there is the load drive device of (linearly) light modulation effect, with efficiently solve described in background technology and problem.
The other objects and advantages of the present invention can be further understood from disclosed technical characteristic.
In this, an one exemplary embodiment of the present invention provides one to be suitable to drive outdoor display and have the load drive device of (linearly) light modulation effect, comprising: weather sense line and display driver. Wherein, weather sense line is configured to sense that the weather state corresponding to outdoor display setting area, and provides the sensing voltage signal changed with weather state according to this. Display driver is coupled between weather sense line and outdoor display, and it is configured to react on described sensing voltage signal and drive outdoor display to display. When weather state is the cloudy day (or evening), then described sensing voltage signal can present linear change within the scope of a default voltage, and then makes the display brightness of outdoor display can present linear change between maximum brightness and minimum brightness.
In an one exemplary embodiment of the present invention, when weather state is fine day, then described sensing voltage signal maintains a default voltage level, and then makes the display brightness of outdoor display maintain maximum brightness. With this understanding, weather sense line may include that photoconductive resistance, NPN type bipolar junction transistors, positive-negative-positive bipolar junction transistors, the first resistance, the second resistance and the first nmos pass transistor. Wherein, the first end of photoconductive resistance is coupled to a system voltage. The collector of NPN type bipolar junction transistors is coupled to described system voltage, and the emitter-base bandgap grading of NPN type bipolar junction transistors is then coupled to the second end of photoconductive resistance. The emitter-base bandgap grading of positive-negative-positive bipolar junction transistors is coupled to described system voltage, the collector of positive-negative-positive bipolar junction transistors is then in order to produce described sensing voltage signal, and the base stage of positive-negative-positive bipolar junction transistors is then coupled to the collector of NPN type bipolar junction transistors. First end of the first resistance is coupled to described system voltage, and the second end of the first resistance is then coupled to the base stage of NPN type bipolar junction transistors. First end of the second resistance is coupled to the second end of the first resistance, and the second end of the second resistance is then coupled to an earthing potential. The drain electrode of the first nmos pass transistor is coupled to the emitter-base bandgap grading of NPN type bipolar junction transistors, and the grid of the first nmos pass transistor is coupled to described system voltage, and the source electrode of the first nmos pass transistor is then coupled to described earthing potential.
In an one exemplary embodiment of the present invention, when weather state is rainy day or greasy weather, then described sensing voltage signal maintains described default voltage level, and then makes the display brightness of outdoor display maintain described maximum brightness. With this understanding, weather sense line can also include: the second nmos pass transistor, the first diode, the second diode, rainy day sensor, and greasy weather sensor. Wherein, the drain electrode of the second nmos pass transistor is coupled to the grid of the first nmos pass transistor, and the source electrode of the second nmos pass transistor is then coupled to described earthing potential. The negative electrode of the first diode and the second diode is coupled to the grid of the second nmos pass transistor. Rainy day sensor is coupled to the anode of the first diode, and it is configured to sense that whether weather state is the rainy day. Greasy weather sensor is coupled to the anode of the second diode, and it is configured to sense that whether weather state is the greasy weather.
In an one exemplary embodiment of the present invention, weather sense line can also include: the delay cell being made up of resistance (R) and electric capacity (C), and it is configured to postpone and conduct described sensing voltage signal to display driver.
In an one exemplary embodiment of the present invention, weather sense line can also include: resets diode, it is coupled between delay cell and described system voltage, and it is configured to when load drive device shuts down, discharge to reset load drive device to the electric capacity (C) in delay cell.
Based on above-mentioned, the load drive device that the present invention carries because learning the weather state in the region set by outdoor display by photoconductive resistance, rainy day sensor and greasy weather sensor. Once weather state is fine day (daytime), rainy day or greasy weather, then the display brightness of outdoor display is forced to maintain maximum brightness. But, once the words that weather state is the cloudy day (evening), the display brightness then forcing outdoor display presents linear change (such as: more late over time, then the display brightness of outdoor display can from maximum brightness linear change to minimum brightness) between maximum brightness and minimum brightness. The problem of light evil consequently, it is possible to be not only able to ease up/suppress, and also be able to reduce the potential of nighttime driving person and travel danger.
Accompanying drawing explanation
Figure below is a part for description of the present invention, depicts the example embodiment of the present invention, and accompanying drawing illustrates principles of the invention together with the description of description.
Fig. 1 is the system architecture diagram of the load drive device of the present invention one one exemplary embodiment.
Fig. 2 is the block chart of the load drive device of Fig. 1.
Fig. 3 is the enforcement layout of the load drive device of Fig. 2.
Symbol description in accompanying drawing:
10-load drive device, 20-outdoor display, 101-weather sense line, 103-display driver, DLY-delay cell, S1-rainy day sensor, S2-greasy weather sensor, R1��R10, RD, RT-resistance, C1, CD-electric capacity, D1, D2, DR-diode, B1, B2-bipolar junction transistors (BJT), Q1, Q2-NMOS transistor, CDS-photoconductive resistance, VDD-system voltage, VDIM-sensing voltage signal, BTmax-maximum brightness, BTmin-minimum brightness, GND-earthing potential.
Detailed description of the invention
For the features described above of the present invention and advantage can be become apparent, by the following examples and coordinate accompanying drawing to elaborate.
With detailed reference to the one exemplary embodiment of the present invention, the example of described one exemplary embodiment is described in the accompanying drawings. It addition, all possible parts, the assembly/component of identical label is used to represent same or like part in drawings and the embodiments.
Fig. 1 is the system architecture diagram of the load drive device 10 of the present invention one one exemplary embodiment. Fig. 2 is the block chart of the load drive device 10 of Fig. 1. Fig. 3 is the enforcement layout of the load drive device 10 of Fig. 2.
Please refer to Fig. 1��Fig. 3, load drive device 10 is suitable to drive any kind of outdoor display (outdoordisplay) 20, also or outdoor display billboard (outdoordisplaybillboard), but is not restricted to this. And, load drive device 10 may include that weather sense line (weathersensingcircuit) 101 and display driver (displaydriver) 103.
In this one exemplary embodiment, weather sense line 101 is configured to sense that the weather state (such as: fine day (daytime), cloudy day (evening), rainy day, greasy weather etc.) of the setting area corresponding to outdoor display 20, and provides sensing voltage signal (sensingvoltagesignal) V changed with weather state according to thisDIM. It addition, display driver 103 is coupled between weather sense line 101 and outdoor display 20, and it is configured to react on the sensing voltage signal V that weather sense line 101 providesDIMAnd (such as) employing PWM scheme (PWMscheme, but it is not restricted to this) drive outdoor display 20 to carry out (picture) display.
At this it is noted that when weather state be cloudy day (or evening) time, then the sensing voltage signal V that weather sense line 101 providesDIMCan in a default voltage scope (such as: system voltage VDDVoltage range to earthing potential GND, but be not restricted to this) in present linear change, and then make or force the display brightness of outdoor display 20 can at maximum brightness (maximumbrightness, BTmax) with present linear change between minimum brightness (minimumbrightness, BTmin). It addition, when weather state is fine day, rainy day or greasy weather, then the sensing voltage signal V that weather sense line 101 providesDIMA default voltage level (such as: earthing potential GND, but being not restricted to this) can be maintained, and then make or force the display brightness of outdoor display 20 to maintain maximum brightness (BTmax).
In detail, as shown in Figure 3, weather sense line 101 may include that photoconductive resistance (photoresistor) CDS, NPN type bipolar junction transistors (BJT) B1, positive-negative-positive bipolar junction transistors (BJT) B2, resistance R1��R10, nmos pass transistor (Q1, Q2), electric capacity C1, diode (D1, D2), diode DR, delay cell (delayunit) DLY, rainy day sensor (rainingsensor) S1 and greasy weather sensor (foggingsensor) S2 are reset.
In this one exemplary embodiment, first end of photoconductive resistance CDS is coupled to system voltage VDD, and electric capacity C1 and photoconductive resistance CDS connect. The collector (collector) of NPN type bipolar junction transistors B1 can be coupled to system voltage V via resistance R4DD, the emitter-base bandgap grading (emitter) of NPN type bipolar junction transistors B1 is then coupled to second end of photoconductive resistance CDS. The emitter-base bandgap grading of positive-negative-positive bipolar junction transistors B2 is coupled to system voltage VDD, the collector of positive-negative-positive bipolar junction transistors B2 is then in order to produce the sensing voltage signal V changed with weather stateDIM, the base stage (base) of positive-negative-positive bipolar junction transistors B2 then can be coupled to the collector of NPN type bipolar junction transistors B1 via resistance R10.
First end of resistance R1 is coupled to system voltage VDD, second end of resistance R1 then can be coupled to the base stage of NPN type bipolar junction transistors B1 via resistance R3. First end of resistance R2 is coupled to second end of resistance R1, and second end of resistance R2 is then coupled to earthing potential GND. The drain electrode (drain) of nmos pass transistor Q1 can be coupled to the emitter-base bandgap grading of NPN type bipolar junction transistors B1 via resistance R5, the grid (gate) of nmos pass transistor Q1 can be respectively coupled to earthing potential GND and system voltage V via resistance (R6, R7)DD, the source electrode (source) of nmos pass transistor Q1 is then coupled to earthing potential GND.
The drain electrode of nmos pass transistor Q2 is coupled to the grid of nmos pass transistor Q1, and the source electrode of nmos pass transistor Q2 is then coupled to earthing potential GND. The negative electrode (cathode) of diode (D1, D2) can be coupled to the grid of nmos pass transistor Q2 via resistance R9, and resistance R8 is then coupled between the grid of nmos pass transistor Q2 and earthing potential GND. Rainy day sensor S1 is coupled to the anode (anode) of diode D1, and its be configured to sense that weather state be whether the rainy day (note: if, then export the sensing signal of high levle (Hi), otherwise then export the sensing signal of low level (Lo)). Greasy weather, sensor S2 was coupled to the anode of diode D2, and its be configured to sense that weather state be whether the greasy weather (note: if, then export the sensing signal of high levle (Hi), otherwise then export the sensing signal of low level (Lo)).
It is worth mentioning that at this, in one optionally one exemplary embodiment, the passive component (R, C) of part is to be omitted no (that is: selectable (option)), and all are discussed not affect the normal operation of weather sense line 101 or actual design/application demand.
It addition, delay cell DLY is configured to postpone and conduct sensing voltage signal VDIMTo display driver 103. And, delay cell DLY by postponing resistance RD, can postpone electric capacity CD, and transmission resistance RT is formed, but is not restricted to this. Wherein, the first end postponing resistance RD is coupled to the collector of positive-negative-positive bipolar junction transistors B2. First end of conduction resistance RT is coupled to the second end postponing resistance RD, and second end of conduction resistance RT then conducts delayed sensing voltage signal VDIMTo display driver 103. The first end postponing electric capacity CD is coupled to the second end postponing resistance RD, and the second end postponing electric capacity CD is then coupled to earthing potential GND. In this one exemplary embodiment, delay cell DLY can avoid load drive device 10 when ambient light instantaneous variation is too big (such as lightning) and produce misoperation. Similarly, in one optionally one exemplary embodiment, delay cell DLY can be omitted no (that is: selectable (option)), and all are discussed not affect the normal operation of weather sense line 101 or actual design/application demand.
Reset diode DR and be coupled to delay cell DLY and system voltage VDDBetween, for instance: the anode resetting diode DR is coupled to the first end postponing electric capacity CD, and the negative electrode resetting diode DR is then coupled to system voltage VDD. And, reset diode DR and be configured to when load drive device 10 shuts down (shutdown), discharge to reset load drive device 10 to postponing electric capacity CD. Consequently, it is possible to the meaningless brightness flop of the display brightness of outdoor display 20 that load drive device 10 causes when being again started up can be avoided. Similarly, in one optionally one exemplary embodiment, resetting diode DR and can be omitted no (that is: selectable (option)), all are discussed not affect the normal operation of weather sense line 101 or actual design/application demand.
Based on above-mentioned, it is assumed that the weather state of the setting area of outdoor display 20 is fine day (or daytime), then photoconductive resistance CDS can present Low ESR (being about roughly equal to 1K ��). With this understanding, owing to the emitter voltage (VE) of NPN type bipolar junction transistors B1 can be higher than its base voltage (VB), so NPN type bipolar junction transistors B1 and positive-negative-positive bipolar junction transistors B2 can be ended simultaneously, to such an extent as to sensing voltage signal VDIMFloating can be in and present high impedance (being about roughly equal to earthing potential GND). Thus, display driver 103 will react on the sensing voltage signal V maintaining 0VDIMAnd drive outdoor display 20 to carry out (picture) display, and the display brightness forcing outdoor display 20 maintains maximum brightness (BTmax), so that the advertisement published in outdoor display 20 of dealer or the message transmitted are compare and can be seen clearly under fine day (or daytime) in weather state.
On the other hand, assume the words that weather state is rainy day or greasy weather of the setting area of outdoor display 20, then due to rainy day sensor S1 and greasy weather sensor S2, one of them can export the sensing signal of high levle (Hi), to turn on (turnon) nmos pass transistor Q2, and then close (turnoff) nmos pass transistor Q1. With this understanding, owing to NPN type bipolar junction transistors B1 and positive-negative-positive bipolar junction transistors B2 also can be ended simultaneously, to such an extent as to sensing voltage signal VDIMFloating can be in and similarly present high impedance (being about roughly equal to earthing potential GND). Thus, display driver 103 will react on the sensing voltage signal V maintaining 0VDIMAnd drive outdoor display 20 to carry out (picture) display, and the display brightness forcing outdoor display 20 similarly maintains maximum brightness (BTmax), so that the advertisement published in outdoor display 20 of dealer or the message transmitted are compare under rainy day or greasy weather and can be seen clearly in weather state.
Furthermore, it is assumed that the weather state of outdoor display 20 setting area is the cloudy day (or evening), then the impedance of photoconductive resistance CDS can present high impedance gradually along with dying down gradually of ambient light. With this understanding, owing to the base voltage (VB) of NPN type bipolar junction transistors B1 can be higher than its emitter voltage (VE), so NPN type bipolar junction transistors B1 and positive-negative-positive bipolar junction transistors B2 can be simultaneously turned on, to such an extent as to sensing voltage signal VDIMCan at default voltage scope (that is, a 0V��VDDBetween) in present linear change. Thus, display driver 103 will react on the sensing voltage signal V presenting linear changeDIMAnd drive outdoor display 20 to carry out (picture) display, and the display brightness forcing outdoor display 20 can present linear change (such as: more late over time between maximum brightness (BTmax) and minimum brightness (BTmin), then the display brightness of outdoor display 20 can from maximum brightness (BTmax) linear change to minimum brightness (BTmin)), to realize outdoor display 20 is carried out the effect of linearity light adjusting. The light evil problem that outdoor display 20 brings consequently, it is possible to be not only able to ease up/suppress, and also be able to reduce the potential of nighttime driving person and travel danger.
In sum, the load drive device 10 of the present invention because learning the weather state in region set by outdoor display 20 by photoconductive resistance CDS, rainy day sensor S1 and greasy weather sensor S2. Once the words that weather state is fine day (daytime), rainy day or greasy weather, the display brightness then forcing outdoor display 20 maintains maximum brightness (BTmax), so that the advertisement published in outdoor display 20 of dealer or the message transmitted are compare under fine day, rainy day or greasy weather and can be seen clearly in weather state. But, once the words that weather state is the cloudy day (evening), the display brightness then forcing outdoor display 20 presents linear change (such as: more late over time between maximum brightness (BTmax) and minimum brightness (BTmin), then the display brightness of outdoor display 20 can from maximum brightness (BTmax) linear change to minimum brightness (BTmin)), to realize outdoor display 20 is carried out the effect of linearity light adjusting. The light evil problem that outdoor display 20 brings consequently, it is possible to be not only able to ease up/suppress, and also be able to reduce the potential of nighttime driving person and travel danger.
Although the present invention describes as above with embodiment; so it is not limited to the present invention; without departing from the spirit and scope of the present invention, when doing a little change and retouching, therefore the content that protection scope of the present invention defines when the right depending on application is as the criterion those skilled in the art.
Claims (11)
1. a load drive device, is suitable to drive an outdoor display, and this load drive device includes:
One weather sense line, it is configured to sense that a weather state of the setting area corresponding to this outdoor display, and provides the sensing voltage signal changed with this weather state according to this; And
One display driver, is coupled between this weather sense line and this outdoor display, and it is configured to react on this sensing voltage signal and drive this outdoor display to display;
Wherein, when this weather state is the cloudy day, then this sensing voltage signal presents linear change within the scope of a default voltage, and then makes the display brightness of this outdoor display present linear change between a maximum brightness and a minimum brightness.
2. load drive device according to claim 1, wherein, when this weather state is fine day, then this sensing voltage signal maintains a default voltage level, and then makes the display brightness of this outdoor display maintain this maximum brightness.
3. load drive device according to claim 2, wherein, this weather sense line includes:
One photoconductive resistance, its first end is coupled to a system voltage;
One NPN type bipolar junction transistors, its collector is coupled to this system voltage, and its emitter-base bandgap grading is then coupled to the second end of this photoconductive resistance;
One positive-negative-positive bipolar junction transistors, its emitter-base bandgap grading is coupled to this system voltage, and its collector is then in order to produce this sensing voltage signal, and its base stage is then coupled to the collector of this NPN type bipolar junction transistors;
One first resistance, its first end is coupled to this system voltage, and its second end is then coupled to the base stage of this NPN type bipolar junction transistors;
One second resistance, its first end is coupled to the second end of this first resistance, and its second end is then coupled to an earthing potential; And
One first nmos pass transistor, its drain electrode is coupled to the emitter-base bandgap grading of this NPN type bipolar junction transistors, and its grid is coupled to this system voltage, and its source electrode is then coupled to this earthing potential.
4. load drive device according to claim 3, wherein, this weather sense line includes:
One delay cell, it is configured to postpone and conduct this sensing voltage signal to this display driver.
5. load drive device according to claim 4, wherein, this delay cell includes:
One postpones resistance, and its first end is coupled to the collector of this positive-negative-positive bipolar junction transistors;
One conduction resistance, its first end is coupled to the second end of this delay resistance, and its second end then conducts this delayed sensing voltage signal to this display driver; And
One postpones electric capacity, and its first end is coupled to the second end of this delay resistance, and its second end is then coupled to this earthing potential.
6. load drive device according to claim 5, wherein, this weather sense line includes:
One resets diode, is coupled between this delay cell and this system voltage, and it is configured to, when this load drive device shuts down, discharge to reset this load drive device to this delay electric capacity;
Wherein, the anode of this replacement diode is coupled to the first end of this delay electric capacity, and the negative electrode of this replacement diode is then coupled to this system voltage.
7. load drive device according to claim 3, wherein, when this weather state is rainy day or greasy weather, then this sensing voltage signal maintains this default voltage level, and then makes the display brightness of this outdoor display maintain this maximum brightness.
8. load drive device according to claim 7, wherein, this weather sense line includes:
One second nmos pass transistor, its drain electrode is coupled to the grid of this first nmos pass transistor, and its source electrode is then coupled to this earthing potential;
One first diode, its negative electrode is coupled to the grid of this second nmos pass transistor;
One second diode, its negative electrode is coupled to the grid of this second nmos pass transistor;
One rainy day sensor, is coupled to the anode of this first diode, and it is configured to sense that whether this weather state is the rainy day; And
One greasy weather sensor, is coupled to the anode of this second diode, and it is configured to sense that whether this weather state is the greasy weather.
9. load drive device according to claim 8, wherein, this default voltage scope is determined by this system voltage and this earthing potential, and this default voltage level is this earthing potential.
10. load drive device according to claim 8, wherein, this weather sense line includes:
One first electric capacity, it is with this photoconductive resistance and connects;
One the 3rd resistance, its first end couples the first end of the second end and this second resistance putting this first resistance, and its second end is then coupled to the base stage of this NPN type bipolar junction transistors;
One the 4th resistance, is coupled between the collector of this system voltage and this NPN type bipolar junction transistors;
One the 5th resistance, is coupled between the emitter-base bandgap grading of this NPN type bipolar junction transistors and the drain electrode of this first nmos pass transistor;
One the 6th resistance, is coupled between the grid of this first nmos pass transistor and this earthing potential;
One the 7th resistance, is coupled between the grid of this first nmos pass transistor and this system voltage;
One the 8th resistance, is coupled between the grid of this second nmos pass transistor and this earthing potential;
One the 9th resistance, is coupled between the grid of this second nmos pass transistor and this first and the negative electrode of this second diode; And
1 the tenth resistance, is coupled between the base stage of this positive-negative-positive bipolar junction transistors and the collector of this NPN type bipolar junction transistors.
11. load drive device according to claim 1, wherein, this display driver adopts a PWM scheme to drive this outdoor display to display.
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| CN201410591571.7A CN105632456A (en) | 2014-10-29 | 2014-10-29 | Load driving device suitable for driving outdoor display device |
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| CN201410591571.7A CN105632456A (en) | 2014-10-29 | 2014-10-29 | Load driving device suitable for driving outdoor display device |
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