CN102610200B - Backlight module and control method thereof and display device applying backlight module - Google Patents
Backlight module and control method thereof and display device applying backlight module Download PDFInfo
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- CN102610200B CN102610200B CN201210094932.8A CN201210094932A CN102610200B CN 102610200 B CN102610200 B CN 102610200B CN 201210094932 A CN201210094932 A CN 201210094932A CN 102610200 B CN102610200 B CN 102610200B
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Abstract
The invention relates to a backlight module applied in a display device, which comprises first and second viewing angle light emitting diode clusters, first and second switches, a light emitting diode driving circuit that generates a driving current, and a mode control unit. The first and second switches enable or disenable the first and second viewing angle light emitting diode clusters respectively according first and second wave width modulation signals. The mode control unit switches the backlight module between a two-dimensional display mode and a three-dimensional display mode according to a mode control signal. Under the two-dimensional display mode, the first and second switches synchronously enable the first and second viewing angle light emitting diode clusters so as to emit light together according to the driving current. Under the three-dimensional display mode, the first and second switches alternately enable the first and second viewing angle light emitting diode clusters, so that one of the first and second viewing angle light emitting diode clusters emits light according to the driving current.
Description
Technical field
The invention relates to a kind of display technique, and relate to especially a kind of backlight module and control method thereof of display device.
Background technology
Stereo display technique can be realized the imagination of mankind's powerful and unconstrained style, to reach the effect of being personally on the scene.With regard to using outward appearance, stereo display technique can roughly be distinguished into hyperphoria with fixed eyeballs mirror (stereoscopic) and bore hole formula (auto-stereoscopic).The principle of work of hyperphoria with fixed eyeballs mirror stereo display is mainly to utilize display to send to have the right and left eyes picture of special message, via the selection of wearing type glasses, allows right and left eyes see respectively right and left eyes picture, to form stereoscopic vision.But the inconvenience of wearing glasses and uncomfortable, makes the stereo display of hyperphoria with fixed eyeballs mirror fail to popularize.Therefore, autostereoscopic display develops and becomes new trend gradually.
According to the technology of the paired stereopsis formula in autostereoscopic display, can be divided into spatial multiplexing formula and time multitask type.Wherein time multitask type utilizes backlight as light splitting mechanism, and the backlight that sees through tool directivity replaces right and left eyes picture and be sent to respectively right and left eyes, to reach stereo display effect.Because being sees through directional backlight, so be called again directive property three-dimensional display backlight.The framework backlight of directive property three-dimensional display backlight has the grating of discrete type so that the light source of different directions to be provided, but have at the same time in the display of two dimension and 3-D display pattern, backlight module usually cannot maintain identical brightness under the switching of different mode, and often causes user's discomfort.As to drive respectively different backlights by independent driving circuit in known techniques under 3-D display pattern, need complicated control hardware to coordinate.And in above-mentioned framework, start different driving circuits under two dimensional mode time, instant starting currents is also larger simultaneously.
Therefore, how designing backlight module and the control method thereof of a new display device, to overcome above-mentioned disappearance, is an industry problem demanding prompt solution for this reason.
Summary of the invention
Therefore, an aspect of the present invention is that a kind of backlight module is being provided, be applied in display device, backlight module comprises: the first view angle light emitting diode string, the second view angle light emitting diode string, the first switch, second switch, LED driving circuit and pattern control module.The first switch is according to the signal activation of first wave width modulation or press down energy the first view angle light emitting diode string.Second switch is according to the signal activation of Second Wave width modulation or press down energy the second view angle light emitting diode string.LED driving circuit is in order to produce drive current.Pattern control module switches backlight module between two dimensional mode and 3-D display pattern, to produce first wave width modulation signal and Second Wave width modulation signal according to pattern control signal.Wherein when pattern control module switches backlight module under two dimensional mode according to pattern control signal, first wave width modulation signal and Second Wave width modulation signal make the first switch and synchronous activation the first view angle light emitting diode string of second switch and the second view angle light emitting diode string, so that the first view angle light emitting diode string and the second view angle light emitting diode string are jointly luminous according to drive current.When pattern control module switches backlight module under 3-D display pattern according to pattern control signal, first wave width modulation signal and Second Wave width modulation signal make staggered activation the first view angle light emitting diode string of the first switch and second switch and the second view angle light emitting diode string so that the first view angle light emitting diode string or the second view angle light emitting diode string one of them is luminous according to drive current.
According to one embodiment of the invention, wherein LED driving circuit is single channel driving circuit, and the first switch and second switch are independently arranged at outside LED driving circuit.
According to another embodiment of the present invention, wherein the first switch and the first view angle light emitting diode string are in series, and second switch and the second view angle light emitting diode string are in series.
According to further embodiment of this invention, wherein LED driving circuit is multichannel driving circuit, and the first switch and second switch are arranged in LED driving circuit.
According to yet another embodiment of the invention, wherein LED driving circuit starts to provide drive current according to enable signal backlight.
An embodiment who has more according to the present invention, wherein enable signal backlight produces according to first wave width modulation signal and Second Wave width modulation signal.Backlight module more comprises activation unit, produces enable signal backlight when one of them is positioned at activation level in first wave width modulation signal and Second Wave width modulation signal.
Another aspect of the present invention is providing in a kind of display device, comprise: backlight module and picture element array.Backlight module comprises: the first view angle light emitting diode string, the second view angle light emitting diode string, the first switch, second switch, LED driving circuit and pattern control module.The first switch is according to the signal activation of first wave width modulation or press down energy the first view angle light emitting diode string.Second switch is according to the signal activation of Second Wave width modulation or press down energy the second view angle light emitting diode string.LED driving circuit is in order to produce drive current.Pattern control module switches backlight module between two dimensional mode and 3-D display pattern, to produce first wave width modulation signal and Second Wave width modulation signal according to pattern control signal.Picture element array comprises plural picture element.Wherein when pattern control module switches backlight module under two dimensional mode according to pattern control signal, first wave width modulation signal and Second Wave width modulation signal make the first switch and the synchronous conducting of second switch and close, so that the first view angle light emitting diode string and the second view angle light emitting diode string are jointly luminous according to drive current, plural picture element provides display frame by the first view angle light emitting diode string and the second view angle light emitting diode string according to demonstration data.When pattern control module switches backlight module under 3-D display pattern according to pattern control signal, first wave width modulation signal and Second Wave width modulation signal make the first switch and the staggered conducting of second switch and close, so that the first view angle light emitting diode string and the second view angle light emitting diode string one of them is luminous according to drive current, plural picture element sequentially shows that by the first view angle light emitting diode string and first data provide the first visual angle display frame and provide the second visual angle display frame by the second view angle light emitting diode string and the second demonstration data.
According to one embodiment of the invention, wherein LED driving circuit is single channel driving circuit, and the first switch and second switch are independently arranged at outside LED driving circuit.
According to another embodiment of the present invention, wherein the first switch and the first view angle light emitting diode string are in series, and second switch and the second view angle light emitting diode string are in series.
According to further embodiment of this invention, wherein LED driving circuit is multichannel driving circuit, and the first switch and second switch are arranged in LED driving circuit.
According to yet another embodiment of the invention, wherein LED driving circuit starts to provide drive current according to enable signal backlight.
According to one embodiment of the invention, wherein enable signal backlight produces according to first wave width modulation signal and Second Wave width modulation signal.Backlight module more comprises activation unit, produces enable signal backlight when one of them is positioned at activation level in first wave width modulation signal and Second Wave width modulation signal.
Another aspect of the present invention is that a kind of backlight module control method is being provided, and is applied in the backlight module of display device, and backlight module control method comprises: produce first wave width modulation signal and Second Wave width modulation signal according to pattern control signal; Judge that according to pattern control signal backlight module is in two dimensional mode or 3-D display pattern; When display device is under two dimensional mode, drive current is provided, but and according to first wave width modulation signal and the activation simultaneously of Second Wave width modulation signal and the first view angle light emitting diode string that can be in parallel and the second view angle light emitting diode string, so that the first view angle light emitting diode string and the second view angle light emitting diode string are jointly luminous according to drive current; When display device is under 3-D display pattern, drive current is provided, and according to the staggered activation of first wave width modulation signal and Second Wave width modulation signal and press down can the first view angle light emitting diode string and the second view angle light emitting diode string so that the first view angle light emitting diode string and the second view angle light emitting diode string one of them is luminous according to drive current.
According to one embodiment of the invention, provide drive current more to comprise: to provide drive current according to enable signal backlight.Wherein enable signal backlight produces when in first wave width modulation signal and Second Wave width modulation signal, one of them is positioned at activation level.
According to another embodiment of the present invention, wherein, under two dimensional mode, the first view angle light emitting diode string and the second view angle light emitting diode string are more comprised jointly according to the luminous step of drive current: the plural picture element in the picture element array of display device provides display frame by the first view angle light emitting diode string and the second view angle light emitting diode string according to demonstration data.
According to yet another embodiment of the invention, wherein, under 3-D display pattern, one of them more comprises according to the luminous step of drive current to make the first view angle light emitting diode string and the second view angle light emitting diode string: the plural picture element in the picture element array of display device sequentially shows that by the first view angle light emitting diode string and first data provide the first visual angle display frame and show that by the second view angle light emitting diode string and second data provide the second visual angle display frame.
Applying advantage of the present invention ties up in by making the simultaneously conducting of light-emitting diodes pipe string of different visual angles and make the staggered conducting of light-emitting diodes pipe string of different visual angles under two dimensional mode under 3-D display pattern, can maintain the brightness of Integral back optical module, and reach easily above-mentioned object.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended graphic being described as follows:
Fig. 1 is in one embodiment of the invention, a kind of calcspar of display device;
Fig. 2 is in one embodiment of the invention, the calcspar of the backlight module of Fig. 1;
Fig. 3 A is in one embodiment of the invention, and the backlight module of Fig. 2, under two dimensional mode, shows the sequential chart of data, first wave width modulation signal, Second Wave width modulation signal and enable signal;
Fig. 3 B is in one embodiment of the invention, and the backlight module of Fig. 2, under 3-D display pattern, shows the sequential chart of data, first wave width modulation signal, Second Wave width modulation signal and enable signal;
Fig. 4 is in the second embodiment of the present invention, the calcspar of the backlight module of Fig. 1;
Fig. 5 A is in the second embodiment of the present invention, and the backlight module of Fig. 4, under two dimensional mode, shows the sequential chart of data, first wave width modulation signal, Second Wave width modulation signal and enable signal;
Fig. 5 B is in the second embodiment of the present invention, and the backlight module of Fig. 4, under 3-D display pattern, shows the sequential chart of data, first wave width modulation signal, Second Wave width modulation signal and enable signal;
Fig. 6 is in the third embodiment of the present invention, the calcspar of the backlight module of Fig. 1;
Fig. 7 is in one embodiment of the invention, the process flow diagram of backlight module control method.
[primary clustering symbol description]
1: display device
12: picture element array
16: gate pole driver
20: the first view angle light emitting diode strings
22: the second view angle light emitting diode strings
26: second switch
40: activation unit
701-709: step
D1-Dn: show data
I: drive current
VLED+: positive voltage terminal
BE: enable signal backlight
PWM1: first wave width modulation signal 10: backlight module
14: source electrode driver
18: time schedule controller
21: pattern control module
24: the first switches
28: LED driving circuit
700: backlight module control method
CL: pattern control signal
G1-Gm: gate trigger signal
VIN: power signal
VLED-: negative voltage side
DE: data enable signal
PWM2: Second Wave width modulation signal.
embodiment
Please refer to Fig. 1.Fig. 1 is in one embodiment of the invention, a kind of calcspar of display device 1.
Please refer to Fig. 2.Fig. 2 is in one embodiment of the invention, the calcspar of the backlight module 10 of Fig. 1.Backlight module 10 comprises: the first view angle light emitting diode string 20, the second view angle light emitting diode string 22, the first switch 24, second switch 26, LED driving circuit 28 and pattern control module 21.
In the present embodiment, LED driving circuit 28 is single-channel driving circuits, therefore the first switch 24 and second switch 26 are independently arranged at outside LED driving circuit 28, and are in series with the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 respectively.And the branch road that the first view angle light emitting diode string 20 and the first switch 24 form, by the branch circuit parallel connection forming with the second view angle light emitting diode string 22 and second switch 26 to join with negative voltage side (VLED-) with the positive voltage terminal (VLED+) of LED driving circuit 28.
The first switch 24 is according to the PWM1 activation of first wave width modulation signal or press down energy the first view angle light emitting diode string 20.Second switch 26 is according to the PWM2 activation of Second Wave width modulation signal or press down energy the second view angle light emitting diode string 22.LED driving circuit 28 is according to a power signal VIN, in the time receiving to start the enable signal BE backlight of LED driving circuit 28, in between positive voltage terminal VLED+ and negative voltage side VLED-, produce drive current I, to be sent to two light-emitting diodes pipe strings.
Please refer to Fig. 3 A and Fig. 3 B.Fig. 3 A is in one embodiment of the invention, the backlight module 10 of key diagram 2, under two dimensional mode, shows the sequential chart of the enable signal BE backlight of data, first wave width modulation signal PWM1, Second Wave width modulation signal PWM2 and LED driving circuit 28.Fig. 3 B is in one embodiment of the invention, the backlight module 10 of key diagram 2, under 3-D display pattern, shows the sequential chart of the enable signal BE backlight of data, first wave width modulation signal PWM1, Second Wave width modulation signal PWM2 and LED driving circuit 28.
As shown in Fig. 2 and Fig. 3 A, under two dimensional mode, first enable signal BE backlight transfers high state to by low state, and LED driving circuit 28 is started.After according to data enable signal DE, in each picture frame (as n picture frame and n+1 picture frame in Fig. 3 A), will transmit two and show data.In the present embodiment, these two demonstrations data are the first visual angle and show data, and meaning is that picture element array 12 entirety in Fig. 1 show the demonstration data that receive same view angle.Now, first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 will be according to showing that data make the first switch 24 and the synchronous conducting of second switch 26 and close.Therefore, the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 also will synchronously be enabled and press down energy.Due to the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 parallel connections, when luminous, will be assigned to fifty-fifty the half (in the time that the load value of the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 approximately equates) of drive current I when being synchronously enabled.Therefore, what picture element array 12 can be by the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 is luminous, according to showing that data provide display frame.
As shown in Fig. 2 and Fig. 3 B, under 3-D display pattern, first enable signal BE backlight transfers high state to by low state, and LED driving circuit 28 is started.In n picture frame, also will transmit two and show data.Because 3-D display pattern need to transmit at different time the data of different visual angles, therefore in single picture frame, will successively transmit the first visual angle and show that data and the second visual angle show data.In an embodiment, the first visual angle shows that data are to want to send to the demonstration data of user's left eye, and is sent to picture element array 12 to show.The second visual angle shows that data are for to want to send to the demonstration data of user's right eye, and is sent to picture element array 12 to show.
Now, first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 will make the first switch 24 and the staggered conducting of second switch 26 and close.Therefore, the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22, in the single time, only have one of them luminous according to drive current I.In 3B figure, in the time receiving the first visual angle demonstration data, the first switch 24 will make the first view angle light emitting diode string 20 luminous thereupon conducting, and makes luminous by the first view angle light emitting diode string 20 of picture element array 12, shows that according to the first visual angle data provide the first visual angle display frame.And in the time receiving the second visual angle demonstration data, second switch 26 will make the second view angle light emitting diode string 22 luminous thereupon conducting, and make luminous by the second view angle light emitting diode string 22 of picture element array 12, show that according to the second visual angle data provide the second visual angle display frame.
Therefore, backlight module of the present invention can be under two dimensional mode, make picture element array 12 provide display frame according to the first view angle light emitting diode string 20 and the luminous of the second view angle light emitting diode string 22 of activations simultaneously, and each the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 are to carry out luminous according to the half of drive current I.Under 3-D display pattern, the picture element of picture element array 12 provides respectively the first visual angle display frame and the second visual angle display frame according to the first view angle light emitting diode string 20 and the luminous of the second view angle light emitting diode string 22 of staggered activation, and each the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 are to carry out luminous according to drive current I.
In sum, under different display modes, backlight module 10 can adopt single driving circuit, adjust under the situation of lighting time at the width that does not change first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2, make to provide to the backlight illumination of picture element array 12 to remain identical, and the switching being unlikely between display mode causes user's discomfort.Therefore, backlight module 10, by not needing the control hardware of additional designs complexity, can reach above-mentioned object, also can be controlled in rational scope for the instant starting currents of driving circuit.
Please refer to Fig. 4.Fig. 4 is in another embodiment of the present invention, the calcspar of the backlight module 10 of Fig. 1.The backlight module 10 of the present embodiment is similar with Fig. 2.But in the present embodiment, backlight module 10 more comprises activation unit 40.Activation unit 40 can be in order to receive first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2.In the present embodiment, when one of them is positioned at activation level at first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2, produce enable signal BE backlight.
Referring to Fig. 5 A and Fig. 5 B.Fig. 5 A is in one embodiment of the invention, the backlight module 10 of key diagram 4, under two dimensional mode, shows the sequential chart of the enable signal BE backlight of data, first wave width modulation signal PWM1, Second Wave width modulation signal PWM2 and LED driving circuit 28.Fig. 5 B is in one embodiment of the invention, the backlight module 10 of key diagram 4, under 3-D display pattern, shows the sequential chart of the enable signal BE backlight of data, first wave width modulation signal PWM1, Second Wave width modulation signal PWM2 and LED driving circuit 28.
While being activation unit 40 one of them is positioned at activation level at first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 due to enable signal BE backlight, produce, therefore in the present embodiment, enable signal BE backlight only first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 when wherein one is for high state just for high state is to open LED driving circuit 28 so that drive current I to be provided.Because LED driving circuit 28 has overvoltage protection mechanism, to start this protection mechanism in the time detecting light-emitting diodes pipe string open circuit.But due to the characteristic of the backlight module 10 of sequence scanning formula, light-emitting diodes pipe string can interlock and operate between opening and closing, therefore in the time that light-emitting diodes pipe string is closed, LED driving circuit 28 has the situation generation that superpotential drives, and increases spuious power consumption penalty and reduces circuit conversion efficiency.Therefore; one of them is positioned at the enable signal BE backlight that activation level just produces and can in the time that light-emitting diodes pipe string is closed, also closes LED driving circuit 28 simultaneously in the present embodiment, to utilize first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2, avoids the situation of overvoltage protection mechanism erroneous judgement to produce.In an embodiment, activation unit 40 can by door or other possible synchronous device realize.
Please refer to Fig. 6.Fig. 6 is in another embodiment of the present invention, the calcspar of the backlight module 10 of Fig. 1.The backlight module 10 of the present embodiment is similar with Fig. 2.But in the present embodiment, the LED driving circuit 28 in backlight module 10 is multichannel driving circuit.The first switch 24 and second switch 26 can be arranged in LED driving circuit 28.The first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 can be connected with LED driving circuit 28 by different channels respectively, and further switch by inner the first switch 24 and the second switch 26 arranging of LED driving circuit 28, reach effect that the backlight module 10 of Fig. 2 switches between two dimension and 3-D display pattern.And, in the present embodiment, also can be by the circuit design of LED driving circuit 28 inside, receive the enable signal BE backlight that directly opens or close and operate in the mode of Fig. 3 A and Fig. 3 B, or enable signal BE backlight is produced by first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 in inside, operate in the mode of Fig. 5 A and Fig. 5 B.
Should be noted, in above-described embodiment, be only an embodiment about the high state of signal and the statement of low state, in other embodiment, also may produce respectively activation and the effect that presses down energy by low state and high state.
Please refer to Fig. 7.Fig. 7 is in one embodiment of the invention, the process flow diagram of backlight module control method 700.Backlight module control method 700 can be applicable in the backlight module 10 as shown in Fig. 2, Fig. 4 and Fig. 6.Backlight module control method 700 comprises the following step (should be appreciated that, mentioned step in the present embodiment, except chatting especially bright its order person, all can adjust its front and back order according to actual needs, even can carry out simultaneously or partly simultaneously).
In step 701, judge according to pattern control signal CL whether backlight module 10 is arranged in two dimensional mode.When display mode is two dimensional mode, in step 702, produce first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 according to pattern control signal CL, and in step 703, drive current I is provided, but and in step 704 according to first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 activation simultaneously and the first view angle light emitting diode string 20 that can be in parallel and the second view angle light emitting diode string 22, to make the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 jointly luminous according to drive current in step 705.
When display mode is not two dimensional mode, judge that display device 1 is under 3-D display pattern, and in step 706, produce first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 according to pattern control signal CL, and provide drive current in step 707.In step 708, according to the staggered activation of first wave width modulation signal PWM1 and Second Wave width modulation signal PWM2 and press down can the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22, to make the first view angle light emitting diode string 20 and the second view angle light emitting diode string 22 in step 709, one of them is luminous according to drive current I.
Apply advantage of the present invention and tie up in the light-emitting diodes pipe string conducting simultaneously by make different visual angles under two dimensional mode, and under 3-D display pattern, make the staggered conducting of light-emitting diodes pipe string of different visual angles, can maintain the brightness of Integral back optical module.
Although the present invention discloses as above with embodiment; so it is not in order to limit the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (19)
1. a backlight module, is applied in a display device, it is characterized in that, this backlight module comprises:
One first view angle light emitting diode string;
One second view angle light emitting diode string;
One first switch, with according to a first wave width modulation signal activation or press down can this first view angle light emitting diode string;
One second switch, with according to a Second Wave width modulation signal activation or press down can this second view angle light emitting diode string;
One LED driving circuit, in order to produce a drive current; And
One pattern control module, switches this backlight module between a two dimensional mode and a 3-D display pattern according to a pattern control signal, to produce this first wave width modulation signal and this Second Wave width modulation signal;
Wherein in switching this backlight module when this pattern control module under this two dimensional mode according to this pattern control signal, this first wave width modulation signal and this Second Wave width modulation signal make this first switch and this first view angle light emitting diode string of the synchronous activation of this second switch and this second view angle light emitting diode string, so that this first view angle light emitting diode string and this second view angle light emitting diode string are jointly luminous according to this drive current;
In switching this backlight module when this pattern control module under this 3-D display pattern according to this pattern control signal, this first wave width modulation signal and this Second Wave width modulation signal make staggered this first view angle light emitting diode string of activation of this first switch and this second switch and this second view angle light emitting diode string so that this first view angle light emitting diode string and this second view angle light emitting diode string one of them is luminous according to this drive current.
2. backlight module according to claim 1, is characterized in that: wherein this LED driving circuit is a single channel driving circuit, and this first switch and this second switch system are independently arranged at outside this LED driving circuit.
3. backlight module according to claim 1, is characterized in that: wherein this first switch and this first view angle light emitting diode string are in series, and this second switch and this second view angle light emitting diode string are in series.
4. backlight module according to claim 1, is characterized in that: wherein this LED driving circuit is a multichannel driving circuit, and this first switch and this second switch system are arranged in this LED driving circuit.
5. backlight module according to claim 1, is characterized in that: wherein this LED driving circuit starts to provide this drive current according to an enable signal backlight.
6. backlight module according to claim 1, is characterized in that: wherein this enable signal backlight produces according to this first wave width modulation signal and this Second Wave width modulation signal.
7. backlight module according to claim 6, is characterized in that: more comprise an activation unit, produce this enable signal backlight when one of them is positioned at an activation level in this first wave width modulation signal and this Second Wave width modulation signal.
8. a display device, is characterized in that, comprises a backlight module and a picture element array;
Described backlight module comprises: one first view angle light emitting diode string; One second view angle light emitting diode string; One first switch, with according to a first wave width modulation signal activation or press down can this first view angle light emitting diode string; One second switch, with according to a Second Wave width modulation signal activation or press down can this second view angle light emitting diode string; One LED driving circuit, in order to produce a drive current; And a pattern control module, switch this backlight module between a two dimensional mode and a 3-D display pattern according to a pattern control signal, to produce this first wave width modulation signal and this Second Wave width modulation signal;
Described picture element array comprises plural picture element;
Wherein when this pattern control module switches this backlight module under this two dimensional mode according to this pattern control signal, this first wave width modulation signal and this Second Wave width modulation signal make this first switch and this first view angle light emitting diode string of the synchronous activation of this second switch and this second view angle light emitting diode string, so that this first view angle light emitting diode string and this second view angle light emitting diode string are jointly luminous according to this drive current, these picture elements provide a display frame by this first view angle light emitting diode string and this second view angle light emitting diode string according to demonstration data,
When this pattern control module switches this backlight module under this 3-D display pattern according to this pattern control signal, this first wave width modulation signal and this Second Wave width modulation signal make this first switch and staggered this first view angle light emitting diode string of activation of this second switch and this second view angle light emitting diode string, so that this first view angle light emitting diode string and this second view angle light emitting diode string one of them is luminous according to this drive current, these picture elements show that by this first view angle light emitting diode string and one first data provide one first visual angle display frame and show that by this second view angle light emitting diode string and one second data provide one second visual angle display frame.
9. display device according to claim 8, is characterized in that: wherein this LED driving circuit is a single channel driving circuit, and this first switch and this second switch system are independently arranged at outside this LED driving circuit.
10. display device according to claim 8, is characterized in that: wherein this first switch and this first view angle light emitting diode string are in series, and this second switch and this second view angle light emitting diode string are in series.
11. display device according to claim 8, is characterized in that: wherein this LED driving circuit is a multichannel driving circuit, and this first switch and this second switch system are arranged in this LED driving circuit.
12. display device according to claim 8, is characterized in that: wherein this LED driving circuit starts to provide this drive current according to an enable signal backlight.
13. display device according to claim 12, is characterized in that: wherein this enable signal backlight produces according to this first wave width modulation signal and this Second Wave width modulation signal.
14. display device according to claim 13, it is characterized in that: wherein this backlight module more comprises an activation unit, produce this enable signal backlight when one of them is positioned at an activation level in this first wave width modulation signal and this Second Wave width modulation signal.
15. 1 kinds of backlight module control methods, are applied in a backlight module of a display device, it is characterized in that, this backlight module control method comprises:
Judge that according to a pattern control signal this backlight module is arranged in a two dimensional mode or a 3-D display pattern;
Produce a first wave width modulation signal and a Second Wave width modulation signal according to this pattern control signal;
When this display device lies under this two dimensional mode, one drive current is provided, but and according to this first wave width modulation signal and the activation simultaneously of this Second Wave width modulation signal and the one first view angle light emitting diode string that can be in parallel and one second view angle light emitting diode string, so that this first view angle light emitting diode string and this second view angle light emitting diode string are jointly luminous according to this drive current;
When this display device lies under this 3-D display pattern, this drive current is provided, and according to the staggered activation of this first wave width modulation signal and this Second Wave width modulation signal and press down can this first view angle light emitting diode string and this second view angle light emitting diode string so that this first view angle light emitting diode string and this second view angle light emitting diode string one of them is luminous according to this drive current.
16. backlight module control methods according to claim 15, is characterized in that, provide this drive current more to comprise:
Provide this drive current according to an enable signal backlight.
17. backlight module control methods according to claim 16, is characterized in that: wherein this enable signal backlight produces when in this first wave width modulation signal and this Second Wave width modulation signal, one of them is positioned at an activation level.
18. backlight module control methods according to claim 15, is characterized in that: wherein, under this two dimensional mode, this first view angle light emitting diode string and this second view angle light emitting diode string are more comprised jointly according to the luminous step of this drive current:
Plural picture element in one picture element array of this display device provides a display frame by this first view angle light emitting diode string and this second view angle light emitting diode string according to demonstration data.
19. backlight module control methods according to claim 15, it is characterized in that: wherein, under this 3-D display pattern, one of them more comprises according to the luminous step of this drive current to make this first view angle light emitting diode string and this second view angle light emitting diode string:
Plural picture element in one picture element array of this display device shows that by this first view angle light emitting diode string and one first data provide one first visual angle display frame and show that by this second view angle light emitting diode string and one second data provide one second visual angle display frame.
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| CN103050094B (en) * | 2012-12-27 | 2015-02-04 | 深圳市华星光电技术有限公司 | Overvoltage protection method for backlight driving circuit in 2D/3D (two-dimensional/three-dimensional) mode and backlight driving circuit applying overvoltage protection method |
| US9024540B2 (en) | 2012-12-27 | 2015-05-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Overvoltage protection method for backlight drive circuit of 2D/3D mode and backlight drive circuit using same |
| US8982521B2 (en) | 2013-01-21 | 2015-03-17 | Shenzhen China Star | Overvoltage protection method for backlight driver |
| CN103050096B (en) * | 2013-01-21 | 2015-10-28 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
| CN104536145B (en) * | 2015-01-21 | 2017-06-27 | 深圳市华星光电技术有限公司 | 2D/3D switchable display devices |
| CN110890070A (en) * | 2019-09-25 | 2020-03-17 | 歌尔科技有限公司 | VR display equipment, double-screen backlight driving device and method |
| CN111681617A (en) * | 2020-06-24 | 2020-09-18 | 歌尔科技有限公司 | Double-display-screen backlight driving circuit and method and double-display-screen equipment |
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| WO2007095476A2 (en) * | 2006-02-10 | 2007-08-23 | Colorlink, Inc. | Multi-functional active matrix liquid crystal displays |
| KR101439842B1 (en) * | 2007-06-25 | 2014-09-12 | 삼성전자주식회사 | Backlight unit and 2D-3D switchable image display apparatus employing the same |
| KR101380226B1 (en) * | 2007-07-05 | 2014-04-02 | 엘지디스플레이 주식회사 | 3D image displayable liquid crystal display device |
| CN102053406B (en) * | 2009-11-09 | 2012-07-25 | 李文峰 | Stereoscopic display |
| US9143771B2 (en) * | 2010-02-19 | 2015-09-22 | Lg Electronics Inc. | Image display device and method for operating the same |
| KR101324412B1 (en) * | 2010-05-06 | 2013-11-01 | 엘지디스플레이 주식회사 | Stereoscopic image display and driving method thereof |
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Effective date of registration: 20170808 Address after: 1#, building third, fourth, 6 West Road, Mawei West Road, Mawei District, Fujian, Fuzhou Co-patentee after: Chunghwa Picture Tubes Ltd. Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Address before: 350015, Xingye Road, Mawei Science Park, Fujian, Fuzhou 1, China Co-patentee before: Chunghwa Picture Tubes Ltd. Patentee before: Fujian Huaying Display Technology Co., Ltd. |
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