CN101436393B - LED backlight module and drive circuit and method thereof - Google Patents
LED backlight module and drive circuit and method thereof Download PDFInfo
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- CN101436393B CN101436393B CN2008101852732A CN200810185273A CN101436393B CN 101436393 B CN101436393 B CN 101436393B CN 2008101852732 A CN2008101852732 A CN 2008101852732A CN 200810185273 A CN200810185273 A CN 200810185273A CN 101436393 B CN101436393 B CN 101436393B
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Abstract
The invention relates to a backlight module of a light emitting diode (LED), a driving circuit and a driving method thereof. The driving circuit is suitable for driving at least one LED in at least one area of light emitting units in the backlight module of the LED, and comprises a latch unit and a switching unit, wherein the latch unit is used for receiving control backlight data, and latching the control backlight data during a picture period according to a triggering signal, so as to output a control signal; and the switching unit is coupled to the latch unit and the LED, is used for receiving the control signal, and decides whether the LED emits light according to the control signal. The driving method can reduce transmission line and transmission time substantially, lower manufacturing cost greatly, adaptively change control backlight data provided by a backlight controller or a time sequence controller, and then increase the flexibility of control modes of PWM significantly.
Description
Technical field
The present invention relates to a kind of backlight module, and be particularly related to a kind of light-emitting diode (LED) backlight module and driving circuit and method.
Background technology
In recent years, along with semiconductor science and technology is flourish, portable type electronic product and flat-panel screens product also rise thereupon.And in the middle of the type of numerous flat-panel screens, (Liquid CrystalDisplay LCD) based on advantage such as its low voltage operating, radiationless line scattering, in light weight and volume be little, has become the main flow of display product to LCD immediately.
Generally speaking, because display panels does not have self luminous characteristic, therefore must below display panels, place backlight module, so as to providing display panels required light source.Traditional backlight module roughly can be divided into two types; One of which is by cold-cathode tube (cold cathode FluorescentLamps; CCFL) backlight module of being formed, another then is by light emitting diode (light emittingdiode, the backlight module of LED) being formed.Wherein, because light-emitting diode (LED) backlight module can promote the colour gamut of LCD, so each tame manufacturer replaces the cold-cathode tube backlight module with light-emitting diode (LED) backlight module mostly now.
Yet, since now the mode of driven for emitting lights diode backlight module adopt mostly pulse-length modulation (pulse width modulation, PWM) with the notion of subregion control, so when the number of regions increase of subregion control, may cause following some shortcoming:
1, transmission line and transmission time increase significantly;
2, the control mode of PWM does not have elasticity; And
3, all must dispose a current controller in the zone of each subregion control, so can increase cost of manufacture significantly.
Summary of the invention
In view of this, the present invention provides a kind of light-emitting diode (LED) backlight module and driving circuit and method, so as to reduce transmission line with the transmission time, increase the elasticity of the control mode of PWM, and adopt calmly that voltage-controlled mode reduces cost of manufacture.
The present invention provides a kind of driving circuit, and it is suitable at least one light emitting diode at least one district luminescence unit in the light-emitting diode (LED) backlight module of driving liquid crystal device.Driving circuit proposed by the invention comprises latch lock unit and switch element.Wherein, latch lock unit is controlled backlight data in order to receive one, and in during a picture said control backlight data is carried out breech lock according to a trigger pip, so as to exporting a control signal.Switch element couples latch lock unit and light emitting diode, in order to receiving said control signal, and determines according to this whether light emitting diode is luminous.
The present invention provides a kind of driving method in addition, and it is suitable for driving at least one light emitting diode at least one district luminescence unit in the light-emitting diode (LED) backlight module.Driving method proposed by the invention comprises: at first, a control backlight data and a trigger pip is provided; Then, in during a picture this control backlight data is carried out breech lock according to this trigger pip, so as to exporting a control signal; At last, the said control signal of foundation is with the driven for emitting lights diode.
The present invention provides a kind of light-emitting diode (LED) backlight module with driving circuit that the invention described above proposes in addition.
The present invention is arranged in matrix structure with required driving circuit in the zone of each subregion control of driven for emitting lights diode backlight module; And the mode with quick scanning provides trigger pip to control the light emitting diode string of each district's luminescence unit, and so design promptly can reduce transmission line and transmission time in a large number.In addition; Owing to have latch lock unit in each driving circuit again so that the control backlight data is carried out breech lock; So when quick scanning is with the light emitting diode string that trigger pip is provided controls each district's luminescence unit, and does not allow light emitting diode string brightness of each district's luminescence unit to reduce or glimmer.Need not use current controller in the zone of each subregion control, thus can be widely with hanging down cost of manufacture.After changing the control backlight data that provides by backlight controller or time schedule controller adaptively, can increase the elasticity of the control mode of PWM significantly.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts several preferred embodiments of the present invention, and conjunction with figs., elaborates as follows.
Description of drawings
Fig. 1 illustrates the calcspar of the LCD of one embodiment of the present invention.
Fig. 2 illustrates the circuit diagram of the light-emitting diode (LED) backlight module of one embodiment of the present invention.
Fig. 3 illustrates the circuit diagram of each latch lock unit of one embodiment of the present invention.
Fig. 4 illustrates the circuit diagram of each switch element of one embodiment of the present invention.
Fig. 5 illustrates the time sequential routine figure of each driving circuit of one embodiment of the present invention.
Fig. 6 illustrates the driving method process flow diagram of one embodiment of the present invention.
Description of reference numerals in the above-mentioned accompanying drawing is following:
100: LCD
101: display panels
103: light-emitting diode (LED) backlight module
105: time schedule controller
107: gate drivers
109: source electrode driver
111: backlight controller
201a～201d: latch lock unit
203a～203d: switch element
The 301:D D-flip flop
The 401:N transistor npn npn
A11, A12, A21, A22: luminescence unit
D11, D12, D21, D22: driving circuit
L11, L12, L21, L22: light emitting diode string
C11, C12, C21, C22: control signal
A1, A2: control backlight data
B1, B2: trigger pip
F: during the picture
D: data receiver
CK: clock pulse input terminal
Q: data output end
Vs: system voltage
T1～t8: time
S601～S605: each step of driving method process flow diagram of one embodiment of the present invention
Embodiment
Fig. 1 illustrates the calcspar of the LCD 100 of one embodiment of the present invention.Please with reference to Fig. 1, LCD 100 comprises display panels 101, light-emitting diode (LED) backlight module 103, time schedule controller 105, gate drivers 107, source electrode driver 109, and backlight controller 111.Wherein, gate drivers 107 is controlled by time schedule controller 105 with source electrode driver 109, in order to provide sweep signal and shows signal with the pixel in the driving liquid crystal panel 101 respectively.
In this preferred embodiment; Light-emitting diode (LED) backlight module 103 has 4 district luminescence unit A11, A12, A21 and A22 (but being not restricted to this); Each district luminescence unit A11, A12, A21 and A22 all are controlled by backlight controller 111, in order to the pixel region of light source to the display panels 101 of correspondence to be provided respectively.
Further, Fig. 2 illustrates the circuit diagram of the light-emitting diode (LED) backlight module 103 of one embodiment of the present invention.Please merge with reference to Fig. 1 and Fig. 2, each district luminescence unit A11, A12, A21 and A22 all have many light emitting diodes that are serially connected and a driving circuit.Also promptly: luminescence unit A11 has many light emitting diode L11 that are serially connected (below be called light emitting diode string L11) and driving circuit D11.Luminescence unit A12 has many light emitting diode L12 that are serially connected (below be called light emitting diode string L12) and driving circuit D12.Luminescence unit A21 has many light emitting diode L21 that are serially connected (below be called light emitting diode string L21) and driving circuit D21.Luminescence unit A22 has many light emitting diode L22 that are serially connected (below be called light emitting diode string L22) and driving circuit D22.
In this preferred embodiment, the driving circuit D11 of luminescence unit A11 has latch lock unit 201a and switch element 203a.Wherein, Latch lock unit 201a is in order to receive the control backlight data A1 that is provided by backlight controller 111; And the trigger pip B1 that is provided according to backlight controller 111; And during a picture of LCD 100, in (frame period) control backlight data A1 is carried out breech lock, so as to output control signal C11.Switch element 203a couples latch lock unit 201a and light emitting diode L11, in order to receiving the control signal C11 that latch lock unit 201a is exported, and determines according to this whether light emitting diode string L11 is luminous.
The driving circuit D21 of luminescence unit A21 has latch lock unit 201b and switch element 203b.Wherein, Latch lock unit 201b is in order to receive the control backlight data A2 that is provided by backlight controller 111; And the trigger pip B1 that is provided according to backlight controller 111; And in during a picture of LCD 100 control backlight data A2 is carried out breech lock, so as to output control signal C21.Switch element 203b couples latch lock unit 201b and light emitting diode L21, in order to receiving the control signal C21 that latch lock unit 201b is exported, and determines according to this whether light emitting diode string L21 is luminous.
The driving circuit D12 of luminescence unit A12 has latch lock unit 201c and switch element 203c.Wherein, Latch lock unit 201c is in order to receive the control backlight data A1 that is provided by backlight controller 111; And the trigger pip B2 that is provided according to backlight controller 111; And in during a picture of LCD 100 control backlight data A1 is carried out breech lock, so as to output control signal C12.Switch element 203c couples latch lock unit 201c and light emitting diode L12, in order to receiving the control signal C12 that latch lock unit 201c is exported, and determines according to this whether light emitting diode string L12 is luminous.
The driving circuit D22 of luminescence unit A22 has latch lock unit 201d and switch element 203d.Wherein, Latch lock unit 201d is in order to receive the control backlight data A2 that is provided by backlight controller 111; And the trigger pip B2 that is provided according to backlight controller 111; And in during a picture of LCD 100 control backlight data A2 is carried out breech lock, so as to output control signal C22.Switch element 203d couples latch lock unit 201d and light emitting diode L22, in order to receiving the control signal C22 that latch lock unit 201d is exported, and determines according to this whether light emitting diode string L22 is luminous.
Further, Fig. 3 and Fig. 4 illustrate latch lock unit 201a～201d of one embodiment of the present invention and the circuit diagram of switch element 203a～203d respectively.Please merge with reference to Fig. 1～Fig. 4; Each latch lock unit 201a～201d all is made up of 301 of D flip-flops; Its data receiver D receives control backlight data A1 or the A2 that is provided by backlight controller 111 in order to correspondence; Its time clock receiving end CK receives trigger pip B1 or the B2 that is provided by backlight controller 111 in order to correspondence; The then corresponding output control signal of its data output end Q C11, C12, C21 or C22 can understand the pwm signal that control signal C11, C12, C21 or C22 are driven for emitting lights diode string L11, L12, L21 and L22 at this.
In addition; As shown in Figure 4; Each switch element 203a～203d all is made up of 401 of N transistor npn npns; Its grid receives control signal C11, C12, C21 or the C22 that is exported by latch lock unit 201a～201d in order to correspondence, and its first leakage/source electrode can be coupled to a system voltage Vs through light emitting diode string L11, L12, L21 or the L22 of correspondence, and its second leakage/source electrode then is coupled to an earthing potential.
Fig. 5 illustrates the time sequential routine figure of driving circuit D11, D12, D21 and the D22 of one embodiment of the present invention.Fig. 6 illustrates the driving method process flow diagram of one embodiment of the present invention.Please merge with reference to Fig. 1～Fig. 6; In this preferred embodiment; Suppose that each control signal C11, C12, C21 and C22 (also the being pwm signal) resolution of F during a picture of LCD 100 is that the dutycycle of 4 bits, control signal C11 is 50%, the dutycycle of control signal C12 is 75%, the dutycycle of control signal C21 is 25%, and the dutycycle of control signal C22 is 25%.
Based on above-mentioned hypothesis; Because the resolution of each control signal C11, C12, C21 and C22 is 4 bits; So each district luminescence unit A11, A12, A21 just need 4 of corresponding receptions control backlight data A1 or A2 with driving circuit D11, D12, D21 in the A22 during a picture of LCD 100 with D22 in the F, also be each latch lock unit 201a～201d according to trigger pip B1 or B2 and during picture, be 4 times to controlling the number of times that backlight data A1 or A2 carry out breech lock in the F.
In addition; Each latch lock unit 201a～201d carries out can determining after breech lock finishes the dutycycle (also being the dutycycle of pwm signal) of each control signal C11, C12, C21 and C22 according to trigger pip B1 or B2 and during picture to control backlight data A1 or A2 in the F, so as to determining the luminosity of each light emitting diode string L11, L12, L21 and L22 further.
At first explain luminescence unit A11; The data receiver D of the D flip-flop 301 of latch lock unit 201a and time clock receiving end CK can receive control backlight data A1 and the trigger pip B1 that backlight controller 111 is provided respectively; Like step S601, so when time t1, the rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201a; To such an extent as to the D flip-flop 301 meeting breech locks of latch lock unit 201a are in the 1st control backlight data A1 of high-voltage level; Like step S603, and export control signal C11 according to this with driven for emitting lights diode string L11, like step S605.
And then; When time t3; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201a once more; To such an extent as to the D flip-flop 301 of latch lock unit 201a can be in the 2nd control backlight data A1 of high-voltage level by breech lock, and exports control signal C11 according to this with driven for emitting lights diode string L11.Afterwards; When time t5; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201a once more; To such an extent as to the D flip-flop 301 of latch lock unit 201a can be in the 3rd control backlight data A1 of low voltage level by breech lock, and exports control signal C11 according to this with driven for emitting lights diode string L11.At last; When time t7; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201a once more; To such an extent as to the D flip-flop 301 of latch lock unit 201a can be in the 4th control backlight data A1 of low voltage level by breech lock, and exports control signal C11 according to this with driven for emitting lights diode string L11.
Thus; Driving circuit D11 in the luminescence unit A11 can correspondence receive 4 control backlight data A1 in the F during a picture of LCD 100; So as to making that D flip-flop 301 output duty cycles of latch lock unit 201a are 50% control signal C11; With N transistor npn npn 401 conductings in the control switch unit 203a, thereby cause light emitting diode string L11 luminous, so that the pixel region of light source to the display panels 101 of correspondence to be provided.
Then explain luminescence unit A21; The data receiver D of the D flip-flop 301 of latch lock unit 201b and time clock receiving end CK can receive control backlight data A2 and the trigger pip B1 that backlight controller 111 is provided respectively; Like step S601, so when time t1, the rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201b; To such an extent as to the D flip-flop 301 meeting breech locks of latch lock unit 201b are in the 1st control backlight data A2 of high-voltage level; Like step S603, and export control signal C21 according to this with driven for emitting lights diode string L21, like step S605.
And then; When time t3; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201b once more; To such an extent as to the D flip-flop 301 of latch lock unit 201b can be in the 2nd control backlight data A2 of low voltage level by breech lock, and exports control signal C21 according to this with driven for emitting lights diode string L21.Afterwards; When time t5; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201b once more; To such an extent as to the D flip-flop 301 of latch lock unit 201b can be in the 3rd control backlight data A2 of low voltage level by breech lock, and exports control signal C2 according to this with driven for emitting lights diode string L211.At last; When time t7; The rising edge of trigger pip B1 can trigger the D flip-flop 301 of latch lock unit 201b once more; To such an extent as to the D flip-flop 301 of latch lock unit 201b can be in the 4th control backlight data A2 of low voltage level by breech lock, and exports control signal C21 according to this with driven for emitting lights diode string L21.
Thus; Driving circuit D21 in the luminescence unit A21 can correspondence receive 4 control backlight data A2 in the F during a picture of LCD 100; So as to making that D flip-flop 301 output duty cycles of latch lock unit 201b are 25% control signal C21; With N transistor npn npn 401 conductings in the control switch unit 203b, thereby cause light emitting diode string L21 luminous, so that the pixel region of light source to the display panels 101 of correspondence to be provided.
And then explain luminescence unit A12; The data receiver D of the D flip-flop 301 of latch lock unit 201c and time clock receiving end CK can receive control backlight data A1 and the trigger pip B2 that backlight controller 111 is provided respectively; Like step S601, so when time t2, the rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201c; To such an extent as to the D flip-flop 301 meeting breech locks of latch lock unit 201c are in the 1st control backlight data A1 of high-voltage level; Like step S603, and export control signal C12 according to this with driven for emitting lights diode string L12, like step S605.
And then; When time t4; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201c once more; To such an extent as to the D flip-flop 301 of latch lock unit 201c can be in the 2nd control backlight data A1 of high-voltage level by breech lock, and exports control signal C12 according to this with driven for emitting lights diode string L12.Afterwards; When time t6; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201c once more; To such an extent as to the D flip-flop 301 of latch lock unit 201c can be in the 3rd control backlight data A1 of high-voltage level by breech lock, and exports control signal C12 according to this with driven for emitting lights diode string L12.At last; When time t8; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201c once more; To such an extent as to the D flip-flop 301 of latch lock unit 201c can be in the 4th control backlight data A1 of low voltage level by breech lock, and exports control signal C12 according to this with driven for emitting lights diode string L12.
Thus; Driving circuit D12 in the luminescence unit A12 can correspondence receive 4 control backlight data A1 in the F during a picture of LCD 100; So as to making that D flip-flop 301 output duty cycles of latch lock unit 201c are 75% control signal C12; With N transistor npn npn 401 conductings in the control switch unit 203c, thereby cause light emitting diode string L12 luminous, so that the pixel region of light source to the display panels 101 of correspondence to be provided.
Explain luminescence unit A22 at last; The data receiver D of the D flip-flop 301 of latch lock unit 201d and time clock receiving end CK can receive control backlight data A2 and the trigger pip B2 that backlight controller 111 is provided respectively; Like step S601, so when time t2, the rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201d; To such an extent as to the D flip-flop 301 meeting breech locks of latch lock unit 201d are in the 1st control backlight data A2 of high-voltage level; Like step S603, and export control signal C22 according to this with driven for emitting lights diode string L22, like step S605.
And then; When time t4; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201d once more; To such an extent as to the D flip-flop 301 of latch lock unit 201d can be in the 2nd control backlight data A2 of low voltage level by breech lock, and exports control signal C22 according to this with driven for emitting lights diode string L22.Afterwards; When time t6; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201d once more; To such an extent as to the D flip-flop 301 of latch lock unit 201d can be in the 3rd control backlight data A2 of low voltage level by breech lock, and exports control signal C22 according to this with driven for emitting lights diode string L22.At last; When time t8; The rising edge of trigger pip B2 can trigger the D flip-flop 301 of latch lock unit 201d once more; To such an extent as to the D flip-flop 301 of latch lock unit 201d can be in the 4th control backlight data A2 of low voltage level by breech lock, and exports control signal C22 according to this with driven for emitting lights diode string L22.
Thus; Driving circuit D22 in the luminescence unit A22 can correspondence receive 4 control backlight data A2 in the F during a picture of LCD 100; So as to making that D flip-flop 301 output duty cycles of latch lock unit 201d are 25% control signal C22; With N transistor npn npn 401 conductings in the control switch unit 203d, thereby cause light emitting diode string L22 luminous, so that the pixel region of light source to the display panels 101 of correspondence to be provided.
In this preferred embodiment, can receive identical control backlight data with the driving circuit of delegation, also promptly: driving circuit D11 and D12 can receive control backlight data A1 simultaneously, and driving circuit D21 and D22 can receive simultaneously and control backlight data A2.In addition, the driving circuit of same row can receive the identical triggering signal, and also promptly: driving circuit D11 and D21 can receive trigger pip B1 simultaneously, and driving circuit D12 and D22 can receive trigger pip B2 simultaneously.Thus, just can control all light emitting diode string of the luminescence unit of same row simultaneously such as the control line that receives trigger pip B1 or B2, to such an extent as to this preferred embodiment compared with prior art can reduce transmission line and transmission time in a large number.
In addition; This preferred embodiment can change the resolution bit number of each control signal C11, C12, C21 and C22 (also being pwm signal) F during a picture according to the actual design demand; And after can changing the control backlight data A1 and A2 that is provided by backlight controller 111 adaptively, can increase the elasticity of the control mode of PWM.Moreover, because this preferred embodiment adopts fixed voltage-controlled mode,, will hang down cost of manufacture widely so as to coming so do not need in the zone of each subregion control, to use current controller.
Yet in other preferred embodiments of the present invention, each latch lock unit 201a～201d carries out the number of times of breech lock to control backlight data A1 or A2 in the F according to trigger pip B1 or B2 and during picture also can be by control backlight data A1 or A2 decision.Clearer, whether backlight controller 111 can look-ahead analysis/judgements be controlled the change degree of backlight data A1 or A2 and is come to determine adaptively to provide trigger pip B1 or B2 to driving circuit D11, D12, D21 and D22.
For instance, because being all breech lock in time t2, t4 and t6, the latch lock unit 201c of driving circuit D12 also exports the control backlight data A1 that is in high-voltage level.Thus; Backlight controller 111 can be before the latch lock unit 201c that provides trigger pip B2 to driving circuit D12; Look-ahead analysis/judge control backlight data A1 not change, so when time t4 and t6, just no longer trigger pip B2 is provided the latch lock unit 201c to driving circuit D12.Also, can reduce power consumption because of so.
Though above-mentioned preferred embodiment is 4 bits with the resolution of 4 district luminescence unit A11, A12, A21 and A22 collocation control signal C11, C12, C21 and C22 F during a picture of LCD 100; And the dutycycle of control signal C11 is 50%, the dutycycle of control signal C12 is 75%, the dutycycle of control signal C21 is 25%; And being 25% example, the dutycycle of control signal C22 does explanation; But should be after explanation with reference to intact above-mentioned preferred embodiment with those skilled in the art; And voluntarily and easily deduction/class is released more its embodiment in imposing a condition under of multi-region luminescence unit collocation, so also no longer give unnecessary details at this.
In addition, in above-mentioned preferred embodiment, utilize backlight controller 111 to provide control backlight data A1 and A2 and trigger pip B1 and B2 to driving circuit D11, D12, D21 and D22.Yet, in other preferred embodiments of the present invention, also can be directly through/utilize time schedule controller 105 to provide control backlight data A1 and A2 and trigger pip B1 and B2 to driving circuit D11, D12, D21 and D22, still neitherly be limited to this.
In sum; The present invention is arranged in matrix structure with required driving circuit in the zone of each subregion control of driven for emitting lights diode backlight module; And the mode with quick scanning provides trigger pip to control the light emitting diode string of each district's luminescence unit, and so design promptly can reduce transmission line and transmission time in a large number.In addition; Owing to have latch lock unit in each driving circuit again so that the control backlight data is carried out breech lock; So when quick scanning is with the light emitting diode string that trigger pip is provided controls each district's luminescence unit, and does not allow light emitting diode string brightness of each district's luminescence unit to reduce or glimmer.
In addition, because each driving circuit is the light emitting diode string that drives each district's luminescence unit with fixed voltage-controlled mode, thus need not use current controller in the zone of each subregion control, thus can be widely with hanging down cost of manufacture.Moreover; The latch lock unit of each driving circuit can change the resolution bit number of its control signal of exporting during a picture according to the actual design demand; So readaptability ground changes by after the control backlight data that backlight controller or time schedule controller provided, and can increase the elasticity of the control mode of PWM significantly.
Though the present invention with a plurality of embodiment openly as above; Right its is not in order to limit the present invention; Those of ordinary skill under any in the technical field; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (18)
1. driving circuit; Be suitable for driving the light emitting diode at least four district's luminescence units in the light-emitting diode (LED) backlight module of a LCD; Wherein all have a plurality of these light emitting diodes that are serially connected in each district's luminescence unit; And wherein, drive that required said driving circuit is arranged in matrix structure in the zone of each subregion control of said light-emitting diode (LED) backlight module, receive identical control backlight data with the said driving circuit of delegation; The said driving circuit of same row receives the identical triggering signal, and said driving circuit comprises:
One latch lock unit in order to receiving said control backlight data, and carries out breech lock to this control backlight data according to said trigger pip in during a picture, so as to exporting a control signal; And
One switch element couples this latch lock unit and this light emitting diode, in order to receiving this control signal, and determines according to this whether this light emitting diode is luminous.
2. driving circuit as claimed in claim 1, wherein this latch lock unit comprises:
One D flip-flop, its data input pin should be controlled backlight data in order to receive, and its clock pulse input terminal is in order to receive this trigger pip, and its data output end is then in order to export this control signal.
3. driving circuit as claimed in claim 1, wherein this switch element comprises:
One N transistor npn npn, its grid is in order to receive this control signal, and its first leakage/source electrode is coupled to a system voltage through this light emitting diode, and its second leakage/source electrode then is coupled to an earthing potential.
4. driving circuit as claimed in claim 3, wherein when this N transistor npn npn conducting, this light emitting diode can be luminous, otherwise then not luminous.
5. driving circuit as claimed in claim 1; Wherein this LCD also comprises time schedule controller; And this light-emitting diode (LED) backlight module also comprises a backlight controller; And one of them couples this driving circuit this time schedule controller and this backlight controller, in order to this control backlight data and this trigger pip to be provided.
6. driving circuit as claimed in claim 1, wherein this control signal is a pulse width modulating signal.
7. a light-emitting diode (LED) backlight module is suitable for a LCD, and this light-emitting diode (LED) backlight module comprises:
At least four district's luminescence units all have a plurality of light emitting diodes that are serially connected in each district's luminescence unit; And
At least 4 wheel driven moves circuit; In order to drive this light emitting diode; Wherein, drive that required said driving circuit is arranged in matrix structure in the zone of each subregion control of said light-emitting diode (LED) backlight module, receive identical control backlight data with the said driving circuit of delegation; The said driving circuit of same row receives the identical triggering signal, and said driving circuit comprises:
One latch lock unit in order to receiving said control backlight data, and carries out breech lock to this control backlight data according to said trigger pip in during a picture, so as to exporting a control signal; And
One switch element couples this latch lock unit and this light emitting diode, in order to receiving this control signal, and determines according to this whether this light emitting diode is luminous.
8. light-emitting diode (LED) backlight module as claimed in claim 7, wherein this latch lock unit comprises:
One D flip-flop, its data input pin should be controlled backlight data in order to receive, and its clock pulse input terminal is in order to receive this trigger pip, and its data output end is then in order to export this control signal.
9. light-emitting diode (LED) backlight module as claimed in claim 7 is put, and wherein this switch element comprises:
One N transistor npn npn, its grid is in order to receive this control signal, and its first leakage/source electrode is coupled to a system voltage through this light emitting diode, and its second leakage/source electrode then is coupled to an earthing potential.
10. light-emitting diode (LED) backlight module as claimed in claim 9, wherein when this N transistor npn npn conducting, this light emitting diode can be luminous, otherwise then not luminous.
11. light-emitting diode (LED) backlight module as claimed in claim 7 also comprises:
One backlight controller couples this driving circuit, in order to this control backlight data and this trigger pip to be provided.
12. light-emitting diode (LED) backlight module as claimed in claim 7, wherein this LCD comprises time schedule controller, couples this driving circuit, in order to this control backlight data and this trigger pip to be provided.
13. driving circuit as claimed in claim 7, wherein this control signal is a pulse width modulating signal.
14. driving method; Be suitable for driving the light emitting diode at least four district's luminescence units in the light-emitting diode (LED) backlight module; Wherein all have a plurality of these light emitting diodes that are serially connected in each district's luminescence unit; And wherein, drive that required said driving circuit is arranged in matrix structure in the zone of each subregion control of said light-emitting diode (LED) backlight module, receive identical control backlight data with the said driving circuit of delegation; The said driving circuit of same row receives the identical triggering signal, and this driving method comprises:
Said control backlight data and said trigger pip are provided;
During a picture this control backlight data is carried out breech lock according to this trigger pip, so as to exporting a control signal; And
According to this control signal to drive this light emitting diode.
15. driving method as claimed in claim 14, the number of times that wherein in during this picture this control backlight data is carried out breech lock according to this trigger pip by the resolution bit number of said control signal during a said picture maybe this control backlight data determine.
16. driving method as claimed in claim 14 wherein carries out can determining after breech lock finishes the dutycycle of this control signal to this control backlight data in during this picture according to this trigger pip.
17. driving method as claimed in claim 16, the wherein brightness of this lumination of light emitting diode of the dutycycle of this control signal decision.
18. driving method as claimed in claim 14, wherein this control signal is a pulse width modulating signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101852732A CN101436393B (en) | 2008-12-24 | 2008-12-24 | LED backlight module and drive circuit and method thereof |
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| CN2008101852732A CN101436393B (en) | 2008-12-24 | 2008-12-24 | LED backlight module and drive circuit and method thereof |
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| CN101436393A CN101436393A (en) | 2009-05-20 |
| CN101436393B true CN101436393B (en) | 2012-04-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021173153A1 (en) * | 2020-02-28 | 2021-09-02 | Hewlett-Packard Development Company, L.P. | Drivers to power led zones |
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| JP2018124458A (en) * | 2017-02-01 | 2018-08-09 | パナソニック液晶ディスプレイ株式会社 | Liquid crystal backlight device and display device |
| CN109754759B (en) | 2017-11-08 | 2020-11-06 | 京东方科技集团股份有限公司 | Backlight source control device and method and display device |
| CN113450719A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Driving method and driving device for scanning display |
| CN113450724A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device thereof |
| CN113450721A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device and driving method thereof |
| US11348543B2 (en) | 2020-03-26 | 2022-05-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
| US11568793B2 (en) | 2020-03-26 | 2023-01-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
| CN113450723A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device and driving method thereof |
| TWI769616B (en) * | 2020-03-26 | 2022-07-01 | 聚積科技股份有限公司 | Driving method and driving device of scanning display |
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