CN105405407A - Display device and backlight drive method thereof - Google Patents
Display device and backlight drive method thereof Download PDFInfo
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- CN105405407A CN105405407A CN201410465188.7A CN201410465188A CN105405407A CN 105405407 A CN105405407 A CN 105405407A CN 201410465188 A CN201410465188 A CN 201410465188A CN 105405407 A CN105405407 A CN 105405407A
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Abstract
The invention provides a display device and a backlight drive method thereof. The display device comprises a backlight module and a display panel. The backlight module comprises at least one light emitting diode unit containing red phosphorescent material. The light emitting diode unit is switched on at least twice in a frame period and maintains on for a first switch-on duration and a second switch-on duration separately, and the second switch-on duration is less than the first switch-on duration. The display panel corresponds to the backlight module.
Description
Technical field
The invention relates to a kind of display device, and relate to one especially there is the display device of light emitting diode (Light-EmittingDiode, LED) backlight and the driving method of backlight thereof.
Background technology
Light emitting diode have long service life, volume little, not easily break, the advantage such as output low in calories and low-yield consume, replace traditional cathode-ray tube gradually and become the main flow of display.
In recent years, the development trend of display mainly strides forward towards the direction of multicolour and high brightness.Generally speaking, in order to obtain full-color display frame, the LED core of red, green and blue three look visible rays can fit together by backlight module usually, and the visible ray of various wavelength is mixed to obtain white light source.But this design needs the package structure for LED that usage quantity is relatively many, and cost and device volume also increase thereupon.
Existing a kind of light emitting diode be made up of blue light-emitting diode tube core and doping red phosphorescence material is suggested, in order to replace the light emitting diode of traditional Multi-core combination at present.Because luminescence efficiency is high, and single package structure for LED just can provide white light source, contributes to the usage quantity and the configuration volume that reduce package structure for LED.
But, though use the light emitting diode of red phosphorescence material to improve colour developing degree, there is the shortcoming that reaction velocity is slower, the image of liquid crystal display can be made under dynamic situation to there will be red smear.Especially, with the brightness of local dimming (localdimming) technological adjustment light-emitting zone, during with enhancing contrast of picture (contrastratio), the colourity of image often can be made to occur significant change; When utilizing backlight scanning technique (scanningbacklightmethod) to reduce dynamic image ghost, red smear also can affect the readability of dynamic image, reduces display quality.
Therefore, there are the light-emitting diode (LED) backlight module and application thereof that need to provide a kind of advanced person, to improve known technology institute problems faced.
Summary of the invention
Of the present invention one towards relating to a kind of display device.This display device comprises backlight module and display panel.Backlight module comprises at least one light emitting diode comprising red phosphorescence material.A picture (frame) in the cycle light emitting diode open at least secondary, and at least continue the first open period and the second open period, wherein the second open period is less than the first open period.The corresponding backlight module of display panel is arranged.
Of the present invention another towards the backlight driving method relating to a kind of display device, be applicable to drive the backlight module with at least one light emitting diode.First this method comprises the steps:, light emitting diode dutycycle (duty) corresponding in a picture cycle and brightness is calculated according to image data, electric current is provided again according to dutycycle and brightness, light emitting diode at least secondary is opened in this picture cycle, and at least continue the first open period and the second open period, wherein the second open period is less than the first open period.
According to above-mentioned, embodiments of the invention are to provide a kind of display device and backlight driving method thereof.Wherein, display device comprises the display panel of the backlight module with at least one light emitting diode, the light source being used for driving the backlight drive module of this backlight module and reception backlight module to send.Modulating current is carried out by backlight drive module, in a picture cycle, open and maintain the opening one section of the light emitting diode main opening time more of a specified duration, local dimming is carried out to display device, to alleviate red phosphorescence material in light emitting diode because of reaction time longer produced red smear problem; After the main opening time, then open light emitting diode at least one times momently, and in conjunction with backlight scanning technique, further to eliminate red smear and dynamic image ghost, promote readability and the display quality of dynamic image.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the system block diagrams of a kind of display device illustrated according to one embodiment of the invention;
Fig. 2 is the part-structure sectional view of a kind of backlight module illustrated according to one embodiment of the invention;
Fig. 3 is the spectral analysis figure of the various weight-light ligh-emitting diode units illustrated according to one embodiment of the invention;
Fig. 4 is the backlight driving method process flow diagram illustrated according to one embodiment of the invention;
Fig. 5 is according to one embodiment of the invention, drives light emitting diode to carry out the local dimming sequential chart that local dimming illustrates with the method for Fig. 4;
Fig. 6 is according to another embodiment of the present invention, drives light emitting diode to carry out the local dimming sequential chart that local dimming illustrates with the method for Fig. 4;
Fig. 7 is according to another embodiment of the present invention, illustrates and drives light emitting diode with the method for Fig. 6, and the local dimming sequential chart when dutycycle essence maintaining opening is 80%; And
Fig. 8 illustrates the driver' s timing figure driving light emitting diode with the method for Fig. 4 according to still another embodiment of the invention.
In figure, element numbers illustrates:
100: display device 101: backlight drive module
107: timing control unit 101b: power-switching circuit
101c: pwm unit 101c1: control circuit
101c2: balancing circuitry 102: panel driving unit
103: backlight module 103a: backlight substrate
104: display panel 105: power-supply unit
106: light emitting diode 106a: blue light-emitting diode tube core
106b: epoxy resin sealing 106c: red phosphorescence material
108: backlight control signal
402: calculate light emitting diode dutycycle corresponding in a picture cycle according to image data, open and close interval and brightness.
404: provide electric current according to dutycycle, keying interval and brightness, On/Off light emitting diode at least secondary in this picture cycle, and maintain at least lasting first open period of opening and the second open period respectively, wherein the second open period is less than the first open period.
R: ruddiness G: green glow
B: blue light S2: on-off element
S3: on-off element S51: curve
S52: curve S 53: curve
S61: curve S 62: curve
S63: curve S 64: curve
S71: curve VS: image data
SPI: the signal that timing control unit exports
D1: main open period D2: down periods
D3: shorter open period D4: down periods
D5: shorter open period D51: dutycycle
D52: dutycycle D53: dutycycle
D61: dutycycle D6: the down periods
D7: shorter open period D8: down periods
D9: shorter open period D10: down periods
P2: shut-in time PWM: pulse bandwidth signal
FB: feedback signal T: picture cycle
T+1: next picture cycle
Embodiment
The present invention is to provide a kind of display device and backlight driving method thereof, can improve light emitting diode because of reaction time longer produced red smear problem, and eliminates dynamic image ghost further, promotes readability and the display quality of dynamic image.In order to become apparent the above embodiment of the present invention and other objects, feature and advantage, several preferred embodiment cited below particularly, and coordinate accompanying drawing to elaborate.
But must be noted that these specific case study on implementation and methods, and be not used to limit the present invention.The present invention still can adopt other features, element, method and parameter to be implemented.The proposition of preferred embodiment is only illustrate technical characteristic of the present invention, and is not used to limit protection scope of the present invention.Those of ordinary skill in this technical field, according to the description of following instructions, not departing from scope of the present invention, can do impartial modification and change.Among different embodiment and accompanying drawing, identical element, is represented with identical component symbol.
Fig. 1 is the system block diagrams of a kind of display device 100 illustrated according to one embodiment of the invention.As Fig. 1 illustrate, display device 100 comprises: timing control unit 107, backlight drive module 101, panel driving unit 102, backlight module 103, display panel 104 and power-supply unit 105.Wherein, backlight drive module 101 comprises power-switching circuit 101b and pulse-length modulation (PluswidthModulation, PWM) unit 101c.Panel driving unit 102 is electrically connected between timing control unit 107 and display panel 104.Timing control unit 107 is electrically connected via pwm unit 101c and power-switching circuit 101b and backlight module 103.Timing control unit 107, panel driving unit 102 and power-switching circuit 101b are electrically connected with power-supply unit 105 respectively.
Timing control unit 107 receives multiple image data VS, and carries out calculation process to image data VS, with the operation of the units such as control panel driver element 102 and backlight module 103.In detail, timing control unit 107 receives image data VS, after calculation process, converts image data VS to backlight control signal 108 by pwm unit 101c; Again by power-switching circuit 101b foundation backlight control signal 108, correspond to the light emitting diode 106 of each light-emitting zone (not illustrating) of display panel 104 in adjustment backlight module 103, to control the luminosity of each light-emitting zone.The image data VS that panel driving unit 102 foundation timing control unit 107 exports and the light source that backlight module 103 provides, carry out image display at display panel 104.
Among the present embodiment, timing control unit 107 can calculate each light emitting diode 106 dutycycle corresponding in a picture cycle, open and close interval and brightness according to image data VS, pwm unit 101c is exported to by tandem Peripheral Interface (SerialPeripheralInterface, SPI); Again by pwm unit 101c according to dutycycle, open and close interval and brightness and decide the electric current pulse bandwidth that power-switching circuit 101b should provide; Power-switching circuit 101b is then according to the pulse bandwidth signal PWM that pwm unit 101c exports, adjust the opening and closing time of each light emitting diode 106 in a picture cycle and strength of current, and with feedback signal FB, practice condition is fed back to pwm unit 101c.That is be, by utilizing the mode of pulse width modulation, control light emitting diode 106 in a picture cycle, open and close interval, ON time and strength of current adjusts the brightness of its institute's palpus to control the luminosity of each light-emitting zone.
Among some embodiments of the present invention, display panel 104 can be that one self is not luminous, and backlight module 103 must be coordinated to provide light source to carry out the display panel of display frame.Such as display panels (LiquidCrystalDisplay, LCD), liquid crystal reflective Projection Display panel (LiquidCrystalOnSilicon, or polymer dispersion type liquid crystal display panel (Non-homogeneousPolymerDispersedLiquidCrystalDisplay, NPD-LCD) etc. LCOS).
Backlight module 103 utilizes multiple light emitting diode 106 to be used as light emitting source, in order to provide the light source needed for display panel 104 image display.Please refer to Fig. 2, Fig. 2 is the part-structure sectional view of a kind of backlight module 103 illustrated according to one embodiment of the invention.Wherein backlight module 103 comprises at least one and is positioned at light emitting diode 106 on backlight substrate 103a.Wherein, light emitting diode 106 is by the epoxy resin sealing 106b of at least one blue light-emitting diode tube core 106a, coated blue light-emitting diode tube core 106a and is embedded in epoxy resin sealing 106b and the red phosphorescence material 106c be covered on blue light-emitting diode tube core 106a formed.
Among some embodiments of the present invention, the blue light B that red phosphorescence material 106c is subject to being sent by blue light-emitting diode tube core 106a excites, ruddiness can be discharged, green fluorescent material (not illustrating) can be adulterated in light emitting diode 106 again to send green glow G, then white light W can be obtained after mixing with blue light B.Among other embodiments of the present invention, yellow phosphorescence material can be used, and the blue light B that yellow fluorescent material is subject to being sent by blue light-emitting diode tube core 106a excites, gold-tinted (not illustrating) can be discharged, more also can obtain white light W with blue light.In the present embodiment, light emitting diode 106 is weight-light ligh-emitting diode units 106 of red, green and blue three blended-light, and preferably, the emission wavelength range of red phosphorescence material 106c is between 600 nanometer to 750 nanometers.
Please refer to Fig. 3, Fig. 3 is the spectral analysis figure of the various weight-light ligh-emitting diode units illustrated according to one embodiment of the invention.Can find after comparing the spectrum of the light emitting diode of the light emitting diode 106 of red, green, blue three blended-light that embodiments of the invention provide, Multi-core mixed light light emitting diode and champac two blended-light: the weight-light ligh-emitting diode unit 106 of red, green, blue three blended-light that the embodiment of the present invention provides has obvious crest in red visible light wavelength scope.This display: the red light of the weight-light ligh-emitting diode unit 106 of red, green, blue three blended-light, excitation than Multi-core mixed light light emitting diode and champac two blended-light light emitting diode high, have and improve display 100 display brightness (brightness) and the advantage of chroma (saturation).
When carrying out display operation, the problem of the red smear that red phosphorescence material 106c causes in light emitting diode 106, then can solve by the aforesaid backlight drive module 101 of control.Please refer to Fig. 4, Fig. 4 is the backlight driving method process flow diagram illustrated according to one embodiment of the invention.First the driving method of backlight drive module 101 comprises the steps:, calculates dutycycle corresponding in light emitting diode 106 1 picture cycles according to image data VS, opens and closes interval and brightness (please refer to step 402).Then electric current is provided according to dutycycle, keying interval and brightness again, light emitting diode 106 at least secondary is opened in this picture cycle, and maintain at least lasting first open period of opening and the second open period, wherein the second open period is less than the first open period, in more detail, there are between first open period and the second open period one first down periods, and the summation essence of the first open period and the second open period equals dutycycle (please refer to step 404).It is worth mentioning that, in open period, the light-emitting zone that display panel 104 is corresponding with light emitting diode 106 can present image because receiving light source.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is known local dimming sequential chart.Fig. 6 drives light emitting diode 106 to carry out the local dimming sequential chart that local dimming illustrates with the method for Fig. 4 according to another embodiment of the present invention.In the embodiment that Fig. 5 and Fig. 6 illustrates, backlight drive module 101 according to image data VS calculate light emitting diode 106 dutycycle and keying interval after, On/Off light emitting diode 106.
In Figure 5, backlight drive module 101 is in a picture cycle T, light emitting diode 106 is opened with fixed current or voltage, in different duty D51, D52 and D53, maintain opening, and change brightness sum total that light emitting diode 106 provides in a picture cycle T (because voltage and brightness are positive relationship in driver' s timing figure.Therefore, for clarity of illustration, below will directly be described with " brightness "), light modulation is carried out to display panel 104.Wherein, when curve S 51, S52 and S53 represent respectively and adopt different duty D51, D52 and D53 to carry out light modulation, the brightness on light emitting diode 106 and the relation of time is put on.
In figure 6, backlight drive module 101 is in fixing dutycycle D6, by the On current intensity of modulated luminescence diode 106, changes the brightness of display panel 104.Wherein, when curve S 61, S62, S63 and S64 represent respectively and adopt different On current intensity to carry out light modulation, the brightness of light emitting diode 106 and the relation of time.
The difference of comparison diagram 5 and Fig. 6 can find: adopt different duty D51 in known technology, when D52 and D53 carries out light modulation to display panel 104, along with different dutycycles, the degree of the red smear of image also different (as Fig. 5 centre circle choosing part illustrate, because emission wavelength range is millisecond (ms) grade between the red phosphorescence material 106c reaction time of 600 ~ 750 nanometers, when dutycycle is larger, when backlight module is closed, can be delayed, cause red motion blur phenomenon more serious), so follow-uply be difficult to compensate this red motion blur phenomenon in various degree by making, according to fixed duty cycle in Fig. 6, local dimming is carried out with the On current intensity of modulated luminescence diode 106, not only can adjust light emitting diode 106 brightness, and curve S 61, S62, S63 are almost consistent with the motion blur phenomenon of S64, therefore can when not making the red smear problem of light emitting diode 106 worsen, the object reaching the regional luminance of adjustment display panel 104, enhancing contrast of picture and save energy, follow-up backlight scanning technique of arranging in pairs or groups carries out operating to improve red smear.
Therefore, when timing control unit 107 to calculate according to image data VS light emitting diode 106 correspondence dutycycle, open and close interval and brightness after, namely the pulse bandwidth of output current is determined by pwm unit 101c, and by power-switching circuit 101b On/Off light emitting diode more than 106 2 times in a picture cycle T.Such as, when first time opens, maintain the main opening time that opening one section is longer, and after closedown a period of time, then open light emitting diode 106 at least one times momently.
Compare known technology only by a switch to control the switching sequence of light emitting diode 106, the backlight drive module 101 that embodiments of the invention use at least has the on-off element that two can be used to control light emitting diode 106 On/Off, to control the switching sequence of light emitting diode 106, make light emitting diode 106 in a picture cycle T, complete the action of On/Off at least secondary.
In some embodiments of the invention, the number of times that light emitting diode 106 is opened in a picture cycle T is less than or equal to five times.And main opening time and other open-intervals sum total, namely equal the dutycycle of light emitting diode 106 correspondence.
Such as, please refer to Fig. 8, Fig. 8 is according to still another embodiment of the invention with the driver' s timing figure that the method for Fig. 4 drives light emitting diode 106 to illustrate.Light emitting diode 106 is in a picture cycle T, one section of down periods D2 is maintained after maintaining one section of main open period D1, and then open, and maintain the open period D3 of a section shorter, maintain one section of down periods D4 again subsequently, of short duration On/Off three times more again afterwards, and each time opening close again after all maintaining one section of open period D5, D7, D9 one section the down periods D6, D8, D10, and enter next picture cycle T+1 after down periods D10 the last time.
In an embodiment of the present invention, main open period D1 can be greater than other open periods D3 and D5, D7, D9.In some embodiments of the invention, the summation of shorter open period D3, D5, D7 and D9 is less than main open period D1.In some embodiments of the invention, the ratio essence of main open period D1 and picture cycle T is between 45% to 50%.
It should be noted that in some embodiments of the invention, down periods D2 is better to be less than 1.67 milliseconds (ms).In addition, embodiments of the invention for the length of shorter open period D3, D5, D7 and the D9 of other beyond main open period D1, and beyond down periods D2 other down periods D4, D6, D8 and D10 the not special restriction of length.Therefore, those of ordinary skill in this technical field, all can adjust according to the display demand of display panel 104, preferably, open period D3>D5>D7>D9, so can have preferably red shadow eradicating efficacy.In addition, also can comprise before main open period D1 first through one section of time delay (not illustrating).
Dutycycle required in a picture cycle T is first calculated by timing control unit, relend by the regulation and control of pulse bandwidth, after main open period D1, open light emitting diode 106 (namely shorter open period D3 at least one times momently, D5, D7 and D9), so as to eliminating the impression degree of human eye for red smear further, red phosphorescence material 106c in light emitting diode 106 can be solved because of reaction time produced red smear problem more of a specified duration while eliminating dynamic image ghost, reason is at shorter open period D3, D5, in D7 and D9, red phosphorescence material 106c has little time reaction because needing the more reaction time, so now light emitting diode 106 produce photochromic partially blue or green, thus the red smear problem produced in main open period D1 is compensated, therefore readability and the display quality of display panel 104 dynamic image can be promoted.
According to above-mentioned, embodiments of the invention are to provide a kind of display device and backlight driving method thereof.Wherein, display device comprises the display panel that the backlight module with at least one light emitting diode, the backlight drive module being used for driving this backlight module and corresponding backlight module are arranged.Modulating current is carried out by backlight drive module, in a picture cycle, open and maintain the opening one section of the light emitting diode main opening time more of a specified duration, local dimming is carried out to display device, to alleviate light emitting diode because of reaction time longer produced red smear problem; And in conjunction with the backlight scanning technique of display, after the main opening time, then open light emitting diode at least one times momently, further to eliminate red smear and dynamic image ghost, promote readability and the display quality of dynamic image.
It should be noted that at this, people is carried out because of experiment with the embodiment described in Fig. 6, find when observing the relativeness of human eye for the impression degree of red tail and the length of dutycycle D61: if the dutycycle D61 that light emitting diode 106 maintains opening is less than less than 75%, human eye is quite obvious for the impression degree of red tail.But when dutycycle D61 approximates 80%, human eye for red tail impression degree then quite trickle (curve S 71 shown as depicted in fig. 7).When dutycycle D61 is more than 85%, the situation of human eye not easily identification red tail.When dutycycle D61 equals 95%, the problem of red tail can not be produced completely.
Therefore, adopt the On current intensity of modulated luminescence diode 106, adjust the backlight illumination of light emitting diode 106 in dutycycle D61, and the dutycycle D61 maintaining opening is elongated, make dutycycle D61 essence be greater than 80% picture cycle T and be less than 100% picture cycle T, under the prerequisite not changing default brightness sum total in a picture cycle T, can further eliminate light emitting diode 106 because of reaction time longer produced red smear problem.
It should be noted that in the embodiment described in Fig. 6 and Fig. 7, the second open period is that 0, dutycycle D61 perseverance is less than a picture cycle T.Such as in the embodiment of Fig. 7, preferably, there is a down periods P2, and down periods P2 essence is less than 1.67 milliseconds (millisecond, ms) (1*0.2/120Hz).
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (10)
1. a display device, comprising:
One backlight module, comprises at least one light emitting diode, and this light emitting diode comprises a red phosphorescence material;
Wherein, in a picture cycle, this light emitting diode has one first open period and one second open period, and wherein this second open period is less than this first open period; And
One display panel, to arranging by backlight module.
2. display device as claimed in claim 1, it is characterized in that, the number of times that this light emitting diode is opened in this picture cycle is less than or equal to five times.
3. display device as claimed in claim 2, it is characterized in that, also comprise the 3rd open period, one the 4th open period and one the 5th open period, wherein this first open period is greater than the 3rd open period, the 4th open period and the 5th open period.
4. display device as claimed in claim 3, it is characterized in that, the summation of this second open period, the 3rd open period, the 4th open period and the 5th open period is less than this first open period.
5. display device as claimed in claim 2, the ratio of this first open period and this picture cycle is between 45% to 50%.
6. display device as claimed in claim 1, it is characterized in that, this light emitting diode comprises: a blue light-emitting diode tube core, and this red phosphorescence material is covered on this blue light-emitting diode tube core, and the reaction time of this red phosphorescence material is millisecond grade.
7. display device as claimed in claim 1, it is characterized in that, this second open period is 0, and this first open period is greater than 80% and is less than this picture cycle of 100%.
8. display device as claimed in claim 7, is characterized in that, at least close this light emitting diode once in this picture cycle, and continues the down periods, and these down periods are less than 1.25 milliseconds.
9. display device as claimed in claim 1, also comprises:
One timing control unit, calculates a dutycycle (duty) corresponding to this light emitting diode according to an image data;
One backlight drive module, drives this backlight module and comprises a pulse-length modulation (PluswidthModulation, PWM), determines a pulse bandwidth of output current according to this dutycycle; And
One power-switching circuit, provides electric current according to this pulse bandwidth, with this light emitting diode of On/Off.
10. a backlight driving method for display device, is applicable to drive a backlight module with at least one light emitting diode, comprises:
This light emitting diode dutycycle corresponding in a picture cycle and a brightness is calculated according to an image data; And
An electric current is provided according to this dutycycle and this brightness, so as to opening this light emitting diode at least secondary in this picture cycle, and maintain at least lasting one first open period of opening and one second open period respectively, wherein this second open period is less than this first open period.
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| CN111341249A (en) * | 2019-05-08 | 2020-06-26 | 友达光电股份有限公司 | Pixel circuit capable of adjusting drive current pulse width and related display panel |
| CN111341249B (en) * | 2019-05-08 | 2021-03-30 | 友达光电股份有限公司 | Pixel circuit capable of adjusting drive current pulse width and related display panel |
| CN110286518A (en) * | 2019-07-26 | 2019-09-27 | 京东方科技集团股份有限公司 | Display module and its control method and display device |
| CN110286518B (en) * | 2019-07-26 | 2022-08-02 | 京东方科技集团股份有限公司 | Display module, control method thereof and display device |
| CN111028795A (en) * | 2019-12-03 | 2020-04-17 | Tcl华星光电技术有限公司 | Brightness adjusting method, dimming device and display panel |
| CN113345367A (en) * | 2020-03-03 | 2021-09-03 | 群创光电股份有限公司 | Display device and driving method thereof |
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