CN203812540U - Display screen brightness control device, display device and air conditioning - Google Patents

Display screen brightness control device, display device and air conditioning Download PDF

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Publication number
CN203812540U
CN203812540U CN201420098539.0U CN201420098539U CN203812540U CN 203812540 U CN203812540 U CN 203812540U CN 201420098539 U CN201420098539 U CN 201420098539U CN 203812540 U CN203812540 U CN 203812540U
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brightness
display screen
signal
processor
control
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郭新生
吕艳红
梁文潮
黄直峰
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Midea Group Co Ltd
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Midea Group Co Ltd
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Abstract

The utility model provides a display screen brightness control device, an air conditioning and a display screen brightness control method. The display screen brightness control device comprises a plurality of drive circuits, a brightness adjusting circuit and a processor; when selection signals from the processor are received, the drive circuits drive corresponding backlight lamp groups, and when a brightness control signal from the brightness adjusting circuit is received, average working voltage of the corresponding backlight lamp groups is adjusted; when a brightness adjusting signal from the processor is received, the brightness adjusting circuit outputs the brightness control signals to the drive circuits at the same time; and when a display instruction is received, the processor outputs lightning on/off signals to the backlight lamp groups and, according to the lightning on/off signals, outputs corresponding selection signals to the drive circuits, and when a brightness adjusting instruction is received, the processor outputs the brightness adjusting signal to the brightness adjusting circuit. Combination control of timing sequence and modulation frequency are performed on a display screen, brightness adjustments of the matrix type LED display screen are simply realized, and control is simple.

Description

Brightness of display screen control device, display device and air-conditioning
Technical field
The utility model relates to air conditioner technical field, in particular to a kind of brightness of display screen control device, a kind of display device and a kind of air-conditioning.
Background technology
At present, the brightness regulation of display screen is all by a PWM(Pulse Width Modulation, pulse-length modulation) control one or one group of LED(Light-Emitting Diode, light emitting diode) brightness of lamp, if while needing to control many group LED brightness, just need multiple PWM to produce circuit, the built-in PWM module number of existing microprocessor is limited, generally only have several, also to take a timer simultaneously, if while needing many group PWM application, just need professional pwm chip, so not only circuit is complicated but also with high costs.
The major part of existing air-conditioning display screen forms by organizing LED more, the LED of super brightness uses also more and more extensive simultaneously, because of its voltage range narrow (if limiting voltage is 2.8V or lower), control brightness if still adopt common PWM mode, because the voltage of PWM output is not very stable, therefore conventionally need to increase storage capacitor and filter capacitor, easily there is flicker, and its brightness adjusting is limited in scope, be not well positioned to meet the brightness regulation that user needs.
Therefore need a kind of new brightness of display screen control technology, can adopt relatively simple circuit realize the adjusting to brightness of display screen and solve the problem that display screen glimmers in the time of low-light level.
Utility model content
The utility model is intended at least solve one of technical matters existing in prior art or correlation technique.
For this reason, an object of the present utility model is to have proposed a kind of brightness of display screen control device, can adopt circuit simple in structure, lower cost to realize brightness of display screen is regulated and solve the problem that display screen glimmers when the low-light level.
Another object of the present utility model is to have proposed a kind of display device.
Another object of the present utility model is to have proposed a kind of air-conditioning.
For achieving the above object, according to the embodiment of first aspect of the present utility model, a kind of brightness of display screen control device has been proposed, comprise: multiple driving circuits, each driving circuit is connected with a backlight group, in the time receiving the selection signal of self processor, drives corresponding backlight group, and in the time of the brightness control signal receiving from brightness regulating circuit, regulate the average working voltage of corresponding backlight group; Described brightness regulating circuit, is connected to described multiple driving circuit, for when the brightness regulated signal receiving from described processor, exports described brightness control signal to described multiple driving circuits simultaneously; Processor, for in the time receiving idsplay order, to each backlight group output light on and off signal, and select accordingly signal according to described light on and off signal to each driving circuit output, and in the time receiving brightness regulation instruction, export described brightness regulated signal to described brightness regulating circuit.
According to the brightness of display screen control device of embodiment of the present utility model, by the brightness regulated signal of brightness adjusting regulating circuit output different frequency, also regulate the average working voltage that inputs to each backlight group, thereby realize the brightness that regulates each backlight group.Wherein, the frequency of brightness regulated signal is higher, and the average working voltage that the unit interval inputs to backlight group is just higher, and the brightness of backlight group is higher; Contrary, the frequency of brightness regulated signal is lower, and the average working voltage that the unit interval inputs to backlight group is just lower, and the brightness of backlight group is lower.Compared with needing professional PWM chip adjusting brightness of display screen in prior art, control simply, and circuit structure is simple, with low cost, adopt high frequency modulated frequency mode to regulate simultaneously, can effectively avoid the flicker problem of display screen in the time of low-light level in correlation technique.
In addition, according to the brightness of display screen control device of above-described embodiment of the present utility model, can also there is following additional technical characterictic:
According to an embodiment of the present utility model, described in each, driving circuit comprises the first triode, and the base stage of described the first triode is connected to described processor, emitter is connected to described brightness regulating circuit, collector is connected to described backlight group, and wherein, each backlight is light emitting diode.
According to an embodiment of the present utility model, described brightness regulating circuit comprises the second triode, and the base stage of described the second triode is connected to described processor, grounded emitter, and collector is connected to the emitter of described the first triode.
According to an embodiment of the present utility model, described in each, driving circuit comprises the first transistor, and the grid of described the first transistor is connected to described processor, drain electrode is connected to described brightness regulating circuit, source electrode is connected to described backlight group, and wherein, each backlight is light emitting diode.
According to an embodiment of the present utility model, described brightness regulating circuit comprises transistor seconds, and the grid of described transistor seconds is connected to described processor, grounded drain, and source electrode is connected to the drain electrode of described the first transistor.
According to an embodiment of the present utility model, described processor comprises sequential control circuit, be connected to described multiple driving circuit and described brightness regulating circuit, in the time exporting described light on and off signal to each backlight group, control the selection signal to described each driving circuit output successively with high level, and according to the output timing of brightness regulated signal described in the sequential control of the described selection signal with high level, make, in the selection signal of output high level, to export described brightness regulated signal.
According to the brightness of display screen control device of embodiment of the present utility model, display screen is made up of multiple backlight groups, the selection signal that driving circuit input by each backlight group has a high level not only can be controlled the light on and off of backlight group, but also can control the light on and off sequential of backlight group, also there is successively the selection signal of high level to each backlight group input, owing to selecting the control of signal, cause each backlight group to show successively, and the light on and off time is all very short, due to the persistence of vision effect of human eye, when realizing multiple backlight group, show.
According to an embodiment of the present utility model, also comprise: collecting unit, be connected to described processor, be used for gathering ambient brightness, and generate brightness regulation instruction, described brightness regulation instruction is sent to described processor, so that described processor sends described brightness regulated signal to described brightness regulating circuit.
According to the brightness of display screen control device of embodiment of the present utility model, by gathering ambient brightness, thereby automatically regulate the brightness of display screen, can, in the time that ambient brightness is higher, increase the brightness of display screen, make user can clearly see the content of display screen; In the time that ambient brightness is lower, reduce the brightness of display screen, not only can save energy consumption, and avoid interference user's rest.
According to an embodiment of the present utility model, described collecting unit comprises light sensor and the divider resistance being connected with described light sensor, and wherein, described light sensor can change according to ambient brightness the resistance value of self.
According to the brightness of display screen control device of embodiment of the present utility model, the mode being connected with divider resistance by light sensor, in the time that ambient brightness changes, the resistance value of light sensor changes, the electric current in light sensor and divider resistance built-up circuit loop changes, the voltage at divider resistance two ends changes, and can determine the display-screen brightness grading that current environment brightness needs according to the voltage swing at divider resistance two ends.
According to second aspect of the present utility model, a kind of display device has been proposed, comprise the brightness of display screen control device described in above-mentioned any one technical scheme.
According to the third aspect of the present utility model, a kind of air-conditioning has been proposed, comprise the display device described in technique scheme.
According to the air-conditioning of embodiment of the present utility model, by use brightness of display screen control device in the display screen of air-conditioning, the brightness that can realize display screen regulates automatically according to ambient brightness, in the time that ambient brightness is higher, increase the brightness of display screen, make user can clearly see the content of display screen; In the time that ambient brightness is lower, reduce the brightness of display screen, not only can save energy consumption, and avoid interference user's rest.
Brief description of the drawings
Fig. 1 shows according to the structural representation of the brightness of display screen control device of an embodiment of the present utility model;
Fig. 2 A shows according to the structural representation of the brightness of display screen control device of another embodiment of the present utility model;
Fig. 2 B shows the each signal sequence comparison of wave shape schematic diagram according to the brightness of display screen control of an embodiment of the present utility model;
Fig. 2 C shows the each signal sequence comparison of wave shape schematic diagram according to the brightness of display screen control of another embodiment of the present utility model.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the utility model, but, the utility model can also adopt other to be different from other modes described here and implement, and therefore, the utility model is not limited to the restriction of following public specific embodiment.
Fig. 1 shows according to the structural representation of the brightness of display screen control device of an embodiment of the present utility model.
As shown in Figure 1, according to the brightness of display screen control device 100 of an embodiment of the present utility model, comprise: multiple driving circuit 102(are 4 driving circuits as shown in Figure 1), each driving circuit 102 and a backlight group 108(4 backlight groups as shown in Figure 1) be connected, for in the time receiving the selection signal of self processor 106, drive corresponding backlight group 108, and in the time of the brightness control signal receiving from brightness regulating circuit 104, regulate the average working voltage of corresponding backlight group 108; Described brightness regulating circuit 104, is connected to described multiple driving circuit 102, for when the brightness regulated signal receiving from described processor 106, exports described brightness control signal to described multiple driving circuits 102 simultaneously; Described processor 106, for in the time receiving idsplay order, export light on and off signal to each backlight group 108, and select accordingly signal according to described light on and off signal to each driving circuit 102 outputs, and in the time receiving brightness regulation instruction, export described brightness regulated signal to described brightness regulating circuit 104.
Export the brightness regulated signal of different frequency by brightness adjusting regulating circuit 104, also regulate the average working voltage that inputs to each backlight group 108, thereby realize the brightness that regulates each backlight group 108.Wherein, the frequency of brightness regulated signal is higher, and the average working voltage that the unit interval inputs to backlight group 108 is just higher, and the brightness of backlight group 108 is higher; Contrary, the frequency of brightness regulated signal is lower, and the average working voltage that the unit interval inputs to backlight group 108 is just lower, and the brightness of backlight group 108 is lower.Compared with needing professional PWM chip adjusting brightness of display screen in prior art, control simply, and with low cost, adopt high frequency modulated frequency mode to regulate simultaneously, can effectively avoid the flicker problem of display screen in the time of low-light level in correlation technique.
In addition, according to the brightness of display screen control device of above-described embodiment of the present utility model, can also there is following additional technical characterictic:
Embodiment one
As one comparatively preferred embodiment, described in each, driving circuit 102 comprises the first triode (as the Q1 in Fig. 1, Q2, Q3, Q4), the base stage of described the first triode is connected to described processor 106, emitter is connected to described brightness regulating circuit 104, collector is connected to described backlight group 108, wherein, each backlight is light emitting diode.
As one comparatively preferred embodiment, described brightness regulating circuit 104 comprises the second triode (as the Q5 in Fig. 1), the base stage of described the second triode is connected to described processor 106, grounded emitter, and collector is connected to the emitter of described the first triode.
Real-time mode two
As another kind comparatively preferred embodiment, described in each, driving circuit 102 comprises the first transistor (as the Q1 in Fig. 1, Q2, Q3, Q4), the grid of described the first transistor is connected to described processor 106, drain electrode is connected to described brightness regulating circuit 104, source electrode is connected to described backlight group 108, wherein, each backlight is light emitting diode.
As another kind comparatively preferred embodiment, described brightness regulating circuit 104 comprises transistor seconds (as the Q5 in Fig. 1), and the grid of described transistor seconds is connected to described processor 106, grounded drain, and source electrode is connected to the drain electrode of described the first transistor.
According to an embodiment of the present utility model, described processor 106 comprises sequential control circuit, in the time exporting described light on and off signal to each backlight group 108, control the selection signal to described each driving circuit 102 outputs successively with high level, and according to the output timing of brightness regulated signal described in the sequential control of the described selection signal with high level, make, in the selection signal of output high level, to export described brightness regulated signal.
Display screen is made up of multiple backlight groups 108, the selection signal that driving circuit 102 inputs by each backlight group 108 have a high level not only can be controlled the light on and off of backlight group 108, but also can control the light on and off sequential of backlight group 108, also there is successively the selection signal of high level to each backlight group 108 inputs, owing to selecting the control of signal, cause each backlight group 108 to show successively, and the light on and off time is all very short, due to the persistence of vision effect of human eye, when realizing multiple backlight group 108, show.
According to an embodiment of the present utility model, also comprise: collecting unit 110, be connected to described processor 106, be used for gathering ambient brightness, and generate brightness regulation instruction, described brightness regulation instruction is sent to described processor 106, so that described processor 106 sends described brightness regulated signal to described brightness regulating circuit.
By gathering ambient brightness, thereby automatically regulate the brightness of display screen, can, in the time that ambient brightness is higher, increase the brightness of display screen, make user can clearly see the content of display screen; In the time that ambient brightness is lower, reduce the brightness of display screen, not only can save energy consumption, and avoid interference user's rest.
According to an embodiment of the present utility model, described collecting unit 110 comprises light sensor and the divider resistance being connected with described light sensor, and wherein, described light sensor can change according to ambient brightness the resistance value of self.
The mode being connected with divider resistance by light sensor, in the time that ambient brightness changes, the resistance value of light sensor changes, the electric current in light sensor and divider resistance built-up circuit loop changes, the voltage at divider resistance two ends changes, and can determine the display-screen brightness grading that current environment brightness needs according to the voltage swing at divider resistance two ends.
According to second aspect of the present utility model, a kind of display device has been proposed, comprise the brightness of display screen control device 100 described in above-mentioned any one technical scheme.
According to the third aspect of the present utility model, a kind of air-conditioning has been proposed, comprise the display device described in technique scheme.
By use brightness of display screen control device 100 in the display screen of air-conditioning, the brightness that can realize display screen regulates automatically according to ambient brightness, in the time that ambient brightness is higher, increases the brightness of display screen, makes user can clearly see the content of display screen; In the time that ambient brightness is lower, reduce the brightness of display screen, not only can save energy consumption, and avoid interference user's rest.
Illustrate the course of work of the brightness of display screen control of embodiment of the present utility model below in conjunction with Fig. 2 A to Fig. 2 C.
Fig. 2 A shows according to the structural representation of the brightness of display screen control device of another embodiment of the present utility model.
As shown in Figure 2 A, as a kind of comparatively concrete embodiment, according to the structural representation of the brightness of display screen control device of another embodiment of the present utility model, comprise: light sensor 202(is corresponding to the collecting unit 110 in Fig. 1), for being different resistance values by the brightness transition of environment, because the resistance value of light sensor changes with the variation of ambient brightness, through the dividing potential drop of divider resistance 204, the voltage VRc that causes divider resistance 204 two ends changes, the span of VRc is determined by the change in resistance scope of light sensor 202 and the resistance value of divider resistance 204, microprocessor 206(is corresponding to the processor 106 in Fig. 1) (for example: be divided into 1-5 level according to the height of voltage be divided into different grades according to VRc value, when voltage is minimum, be 1 grade, now brightness of display screen is minimum, when voltage is the highest, be 5 grades, now brightness of display screen is the highest) display screen 208(is made up of the backlight group 108 in multiple Fig. 1) luminosity regulate, in the time that ambient brightness is higher, improve the brightness of display screen 208, make user can clearly see the content of display screen 208, and in the time that ambient brightness is lower, reduce the luminosity of display screen 208, save energy consumption, avoid interference user simultaneously and have a rest.
Wherein, the course of work of brightness of display screen control is mainly realized by following circuit and signal, comprising: the data sharing data outlet DATA of microprocessor 306, what data output DATA exported is the light on and off signal of LED; Point group selection mouth GP of microprocessor 306, the selection signal of this LED lamp group is controlled in point group selection mouth GP output; The modulating frequency delivery outlet FM of microprocessor 306, what modulating frequency delivery outlet FM exported is modulated luminance signal; LED, for controlling the brightness of LED; Power driving circuit (driving circuit 102 in corresponding diagram 1), power driving circuit is for power amplification.
Concrete regulating step is: microprocessor 206 is exported light on and off signal to data output DATA, again by a point group selection mouth output timing gating signal GP, the output time of while brightness degree control modulating frequency FM as required, modulating frequency equals coefficient value × sweep frequency Fc, and output time Dt equals gating signal SL/ brightness degree signal Ln × current brightness degree signal Lc-1.Specifically, microprocessor is first exported DATA signal, then exports the 1st group of GP1 and select signal, the then output time of luminance signal control modulating frequency FM as required, and the DATA of microprocessor output simultaneously signal, then export the 2nd group of GP2 and select signal.By that analogy, export all GP control signals, then return to the demonstration control that shows the 1st group of GP1.
Display screen 208 is made up of multiple backlight groups, taking two 8 words (4 groups of backlight groups) as example, 18 word adopts two to organize luminous same 8 words that show, as shown in Figure 2 A, the 1st 8 words comprise group control signal GP1, and GP1 controls LED1A, 1B, 1C, 1D, 1E, 1F, 1G, also comprise group control signal GP2, GP2 controls 2A, 2B, 2C, 2D, 2E, 2F, 2G, and the 1st group and the 2nd is combined into 8 characters and shows.The 2nd 8 words comprise group control signal GP3, and GP3 controls LED3A, 3B, 3C, 3D, 3E, 3F, 3G, also comprise group control signal GP4, and GP4 controls LED4A, 4B, 4C, 4D, 4E, 4F, 4G, and the 3rd group and the 4th is combined into another 8 character and shows.The light on and off that microprocessor 206 is controlled this group LED successively according to 1,3,2,4 group of sequence number show the character that needs show, control the brightness of LED by controlling modulating frequency delivery outlet FM output time.Driving circuit comprises each triode Q1, Q2, Q3, Q4, the Q5 shown in Fig. 1, and the signal of microprocessor output is amplified.
Fig. 2 B shows the each signal sequence comparison of wave shape schematic diagram according to the brightness of display screen control of an embodiment of the present utility model.
As shown in Figure 2 B, as a kind of comparatively concrete embodiment, Ln brightness degree range of choice is 1-250, and this example is Ln=5 preferably, the light resistance 5~10K of light sensor 302, and dark resistance is 0.6 ohm, the resistance 6.8K of divider resistance 304.Sweep frequency Fc can value 50-300Hz, and this example, with 50Hz sweep frequency, take brightness degree Lc=5 as example explanation as maximum brightness.
Step 1, VRc is divided into 5 grades by microprocessor 306, in the time that ambient brightness changes, the change in resistance of light sensor 302, divider resistance 304 both end voltage change thereupon, and concrete grade corresponding voltage scope is as follows:
Voltage correspondence 0~0.39V of Ln1, voltage correspondence 0.4~0.59V of Ln2, voltage correspondence 0.6~1.37V of Ln3, voltage correspondence 1.38~1.74V of Ln4; The voltage of Ln5 is greater than more than 1.75.
Step 2, display screen 208 brightness are divided into 5 grades by microprocessor 206, corresponding with 5 grades of VRc respectively.
Step 3, every 0.2 second of microprocessor 206 detects a VRc, averages as magnitude of voltage VRc corresponding to current ambient brightness after detecting 10 times.
Step 4, the magnitude of voltage VRc corresponding according to current environment brightness value definite in step 3, export corresponding brightness degree control, as shown in Figure 2 B, modulating frequency equals coefficient value × sweep frequency Fc, this example is taking coefficient 10 as example, modulating frequency equals 10 × 50=500Hz, output time Dt equals gating signal SL/ brightness degree signal Ln × current brightness degree signal Lc-1, gating signal is 50Hz, gating signal SL=1/f=1/50Hz=20ms, Dt=SL/Ln-1=20/5 × 5-1=19ms, scanning sequency is:
Steps A, microprocessor 206 is first exported light on and off signal 210 to data output DATA, again by a point group selection mouth output timing gating signal GP1(212), control the light on and off of LED1A, 1B, 1C, 1D, 1E, 1F, 1G, simultaneously brightness degree control modulating frequency FM(220 as required) output time Dt, it is 19ms that this example is controlled the output time of adjusting frequency.
Step B, microprocessor 206 is first exported light on and off signal 210 to data output DATA, again by a point group selection mouth output timing gating signal GP3(214), control the light on and off of LED3A, 3B, 3C, 3D, 3E, 3F, 3G, simultaneously brightness degree control modulating frequency FM(220 as required) output time Dt, it is 19ms that this example is controlled the output time of adjusting frequency.
Step C, microprocessor 206 is first exported light on and off signal 210 to data output DATA, again by a point group selection mouth output timing gating signal GP2(216), control the light on and off of LED2A, 2B, 2C, 2D, 2E, 2F, 2G, simultaneously brightness degree control modulating frequency FM(220 as required) output time Dt, it is 19ms that this example is controlled the output time of adjusting frequency.
Step D, microprocessor 206 is first exported light on and off signal 210 to data output DATA, again by a point group selection mouth output timing gating signal GP4(218), control the light on and off of LED4A, 4B, 4C, 4D, 4E, 4F, 4G, simultaneously brightness degree control modulating frequency FM(220 as required) output time Dt, it is 19ms that this example is controlled the output time of adjusting frequency.
Repeating step A, to step D, shows the character of needs according to the brightest mode successively.
Step 5, constantly circulation step 3 is to step 5, and when detecting that VRc grade changes, corresponding change modulating frequency output time Dt, ensures the automatic adjusting of display screen 208 brightness and ambient brightness.
Fig. 2 C shows the each signal sequence comparison of wave shape schematic diagram according to the brightness of display screen control of another embodiment of the present utility model.
As shown in Figure 2 C, as the comparatively concrete embodiment of another kind, Ln brightness degree range of choice is 1-250, and this example preferably Ln=5 is example, the light resistance 5~10K of light sensor 202, and dark resistance is 0.6 ohm, the resistance 6.8K of divider resistance 204.Sweep frequency Fc can value 50-300Hz, and this example is with 50Hz sweep frequency, and current brightness degree Lc=1 minimum brightness is example explanation.
Step 1, VRc is divided into 5 grades by microprocessor 206, in the time that ambient brightness changes, the change in resistance of light sensor 202, divider resistance 204 both end voltage change thereupon, and concrete grade is as follows: voltage correspondence 0~0.39V of Ln1, voltage correspondence 0.4~0.59V of Ln2, voltage correspondence 0.6~1.37V of Ln3, voltage correspondence 1.38~1.74V of Ln4; The voltage of Ln5 is greater than more than 1.75.
Step 2, display screen 208 brightness are divided into 5 grades by microprocessor 206, corresponding with 5 grades of VRc respectively.
Step 3, every 0.2 second of microprocessor 206 detects a VRc, averages as magnitude of voltage VRc corresponding to current ambient brightness after detecting 10 times.
Step 4, the magnitude of voltage VRc corresponding according to current environment brightness value definite in step 3, export corresponding brightness degree control, as shown in Figure 2 C, modulating frequency equals coefficient value × sweep frequency Fc, this example is taking coefficient 10 as example, modulating frequency equals 10 × 50=500Hz, output time Dt equals gating signal SL/ brightness degree signal Ln × current brightness degree signal Lc-1, gating signal is 50Hz, gating signal SL=1/f=1/50Hz=20ms, Dt=SL/Ln-1=20/5 × 1-1=3ms, scanning sequency is:
Step 41, microprocessor 206 is first exported light on and off signal 222 to data output DATA, again by a point group selection mouth output timing gating signal GP1(224), control the light on and off of LED1A, 1B, 1C, 1D, 1E, 1F, 1G, then brightness degree control modulating frequency FM(232 as required) output time Dt, it is 3ms that this example is controlled the output time of adjusting frequency.
Step 42, microprocessor 206 is first exported light on and off signal 222 to data output DATA, again by a point group selection mouth output timing gating signal GP3(226), control the light on and off of LED3A, 3B, 3C, 3D, 3E, 3F, 3G, then brightness degree control modulating frequency FM(232 as required) output time Dt, it is 3ms that this example is controlled the output time of adjusting frequency.
Step 43, microprocessor 206 is first exported light on and off signal 222 to data output DATA, again by a point group selection mouth output timing gating signal GP2(228), control the light on and off of LED2A, 2B, 2C, 2D, 2E, 2F, 2G, then brightness degree control modulating frequency FM(232 as required) output time Dt, it is 3ms that this example is controlled the output time of adjusting frequency.
Step 44, microprocessor 206 is first exported light on and off signal 222 to data output DATA, again by a point group selection mouth output timing gating signal GP4(230), control the light on and off of LED4A, 4B, 4C, 4D, 4E, 4F, 4G, then brightness degree control modulating frequency FM(232 as required) output time Dt, it is 3ms that this example is controlled the output time of adjusting frequency.
Repeating step 41, to step 44, shows the character of needs according to the mode of minimum brightness successively.
It should be noted that, user can set according to demand, in the time of needs minimum brightness, only export GP1, GP3 control signal, GP2, GP4 stop exporting control signal, only have LED1A, 1B, 1C, 1D, 1E, 1F, 1G and LED3A, 3B, 3C, 3D, 3E, 3F, 3G luminous, LED2A, 2B, 2C, 2D, 2E, 2F, 2G and 4A, 4B, 4C, 4D, 4E, 4F, 4G are not luminous, 18 word only has the LED of half luminous, can realize lower luminosity demand, saves power consumption simultaneously.
Step 5, constantly circulation step 3 is to step 5, and when detecting that VRc grade changes, corresponding change modulating frequency output time Dt, ensures the automatic adjusting of display screen 208 brightness and ambient brightness.
Can change according to the brightness value of current environment according to brightness of display screen control device of the present utility model, automatically regulate the brightness of display screen, in the time that ambient brightness is higher, increase the brightness of display screen, ensure that user can know the content of seeing display screen, in the time that ambient brightness is lower, reduce the brightness of display screen, save power consumption, avoid interference user simultaneously and have a rest.
More than be described with reference to the accompanying drawings according to the technical solution of the utility model, can have adopted circuit simple in structure, lower cost to realize brightness of display screen is regulated and solve the problem that display screen glimmers when the low-light level.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (10)

1. a brightness of display screen control device, is characterized in that, comprising:
Multiple driving circuits, each driving circuit is connected with a backlight group, in the time receiving the selection signal of self processor, drives corresponding backlight group, and in the time of the brightness control signal receiving from brightness regulating circuit, regulate the operating voltage of corresponding backlight group;
Described brightness regulating circuit, is connected to described multiple driving circuit, for when the brightness regulated signal receiving from described processor, exports described brightness control signal to described multiple driving circuits simultaneously;
Described processor, for in the time receiving idsplay order, to each backlight group output light on and off signal, and select accordingly signal according to described light on and off signal to each driving circuit output, and in the time receiving brightness regulation instruction, export described brightness regulated signal to described brightness regulating circuit.
2. brightness of display screen control device according to claim 1, it is characterized in that, described in each, driving circuit comprises the first triode, the base stage of described the first triode is connected to described processor, emitter is connected to described brightness regulating circuit, collector is connected to described backlight group, and wherein, each backlight is light emitting diode.
3. brightness of display screen control device according to claim 2, it is characterized in that, described brightness regulating circuit comprises the second triode, and the base stage of described the second triode is connected to described processor, grounded emitter, collector is connected to the emitter of described the first triode.
4. brightness of display screen control device according to claim 1, it is characterized in that, described in each, driving circuit comprises the first transistor, the grid of described the first transistor is connected to described processor, drain electrode is connected to described brightness regulating circuit, source electrode is connected to described backlight group, and wherein, each backlight is light emitting diode.
5. brightness of display screen control device according to claim 4, it is characterized in that, described brightness regulating circuit comprises transistor seconds, and the grid of described transistor seconds is connected to described processor, grounded drain, source electrode is connected to the drain electrode of described the first transistor.
6. according to the brightness of display screen control device described in any one in claim 1 to 5, it is characterized in that, described processor comprises sequential control circuit, be connected to described multiple driving circuit and described brightness regulating circuit, in the time exporting described light on and off signal to each backlight group, control the selection signal to described each driving circuit output successively with high level, and according to the output timing of brightness regulated signal described in the sequential control of the described selection signal with high level, make, in the selection signal of output high level, to export described brightness regulated signal.
7. according to the brightness of display screen control device described in any one in claim 1 to 5, it is characterized in that, also comprise:
Collecting unit, is connected to described processor, for gathering ambient brightness, and generates brightness regulation instruction, described brightness regulation instruction is sent to described processor, so that described processor sends described brightness regulated signal to described brightness regulating circuit.
8. brightness of display screen control device according to claim 7, it is characterized in that, described collecting unit comprises light sensor and the divider resistance being connected with described light sensor, and wherein, described light sensor can change according to ambient brightness the resistance value of self.
9. a display device, is characterized in that, comprises the brightness of display screen control device as described in any one in claim 1 to 8.
10. an air-conditioning, is characterized in that, comprises display device as claimed in claim 9.
CN201420098539.0U 2014-03-05 2014-03-05 Display screen brightness control device, display device and air conditioning Active CN203812540U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103886840A (en) * 2014-03-05 2014-06-25 美的集团股份有限公司 Display screen brightness control device, air conditioner and method for controlling display screen brightness
CN105206209A (en) * 2015-10-26 2015-12-30 广东美的制冷设备有限公司 Display brightness control method and device
CN105788525A (en) * 2016-05-30 2016-07-20 京东方科技集团股份有限公司 Driving method and driving circuit of LED light group, backlight and display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103886840A (en) * 2014-03-05 2014-06-25 美的集团股份有限公司 Display screen brightness control device, air conditioner and method for controlling display screen brightness
CN103886840B (en) * 2014-03-05 2016-08-31 美的集团股份有限公司 Brightness of display screen controls device, air-conditioning and luminance control method for display screen
CN105206209A (en) * 2015-10-26 2015-12-30 广东美的制冷设备有限公司 Display brightness control method and device
CN105206209B (en) * 2015-10-26 2018-05-08 广东美的制冷设备有限公司 The control method and device of display brightness
CN105788525A (en) * 2016-05-30 2016-07-20 京东方科技集团股份有限公司 Driving method and driving circuit of LED light group, backlight and display device
CN105788525B (en) * 2016-05-30 2019-01-22 京东方科技集团股份有限公司 Driving method and its driving circuit, the backlight and display device of LED light group
US10210817B2 (en) 2016-05-30 2019-02-19 Boe Technology Group Co., Ltd. Driving method and driving circuit for light emitting diode light source assembly

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