CN104732912A - Data drive method, data driver and AMOLED displayer - Google Patents

Abstract

The invention provides a data drive method, a data driver and an AMOLED displayer. When a line charging time Gi of a certain sub-frame is greater than or equal to a charging time threshold value Gth, standard drive voltage Vdata is adopted for driving; when the line charging time Gi of a certain sub-frame is smaller than the charging time threshold value Gth, a drive voltage value Vdi of the sub-frame is increased so that the drive voltage value of the sub-frame can be greater than the standard drive voltage Vdata, wherein i represents a sub-frame number. By means of the technical scheme, the pixel charging speed of the sub-frame insufficient in charging time can be effectively improved, charging of the sub-frame can be completed and accurate gray scale data can be obtained within shorter time so as to ensure that accurate gray scale information can be obtained during picture composition, and color distortion is not caused.

Description

Data-driven method, data driver and a kind of displayer

Technical field

The present invention relates to plane display field, particularly relate to a kind of method of data-driven displayer and apply the data driver of the method and a kind of displayer.

Background technology

In flat panel display, AMOLED(Active Matrix Organic Light EmittingDiode-active matrix organic light-emitting display device), active illuminating, fast response time, wide viewing angle, rich color and high brightness frivolous with it, low-power consumption, the advantage such as high-low temperature resistant, be applied in high-performance and large scale display, and progressively become the display technique of new generation in display field.

The pixel that the M × N generally comprised in displayer is capable, it utilizes line scan signals and data voltage signal to scan pixel, when some pixels are scanned by line scan signals, data voltage signal just can be charged to pixel, within the regular hour, pixel voltage charges to the magnitude of voltage that data voltage signal inputs, pixel normal luminous.

In existing data driven technique, adopt 8 subframes to show a complete frame picture, utilize the luma residual effect of human eye to show different GTGs.As shown in Figure 1, be picture building-up process schematic diagram in data driven technique, wherein SF ₁-SF ₈the picture obtained when being respectively different subframe, final eight pictures synthesis obtain final picture 1.The gray level information of picture 1 is:

$\begin{array}{c}{D}_{m\×n}=2^0\·B_{0_{m\×n}}+2^1\·B_{1_{m\×n}}+2^2\·B_{2_{m\×n}}+2^3\·B_{3_{m\×n}}+2^4\·B_{4_{m\×n}}+2^5\·B_{5_{m\×n}}+2^6\·B_{6_{m\×n}}+2^7\·B_{7_{m\×n}}\\ =\underset{i=1}{\overset{8}{\mathrm{\Σ}}}{2}^{i-1}\·B_{{i-1}_{m\×n}}\end{array}$

D is the grey exponent number of display, and m represents line number, and n represents columns, and i is subframe ordinal number, and B is sub-frame data, is 1 or 0.

Above-mentioned 8 subframe time distribute as shown in Figure 2, t _i=T/2 ⁱ, wherein T represents the frame period.Sweep frequency is the displayer of 60Hz, its frame period T=1/60=16.7ms.Time corresponding to each subframe then obtained in frame data according to above-mentioned formulae discovery is respectively: t ₁=8.35ms; t ₂=4.175ms; t ₃=2.09ms; t ₄=1.04ms; t ₅=0.52ms; t ₆=0.26ms; t ₇=0.13ms; t ₈=0.0652ms.

Be the displayer of 240 × 320 for resolution, (comprising 240 row, 320 row pixels), if vertical blanking time is set to 40 row (vertical blanking time is greater than 16 behavior zone of reasonableness), be respectively for the row duration of charging of each subframe: G _i=t _i/ line number=t _i/ (240+40)=t _i/ 280.Can calculate according to above formula, G ₁=30us; G ₂=15us; G ₃=7.5us; G ₄=3.75us; G ₅=1.9us; G ₆=0.85us; G ₇=0.43us; G ₈=0.215us.And in displayer, there is a minimum in the row duration of charging in its each subframe, such as resolution is that in the displayer of 240 × 320, this minimum is about 0.9us, in the row duration of charging of therefore above-mentioned 8 subframes, and subframe SF ₇and SF ₈duration of charging just well below this minimum duration of charging.Therefore subframe SF ₇and SF ₈duration of charging not enough, cause gray level information to be lost, the technological deficiency of picture color distortion.

Summary of the invention

Technical matters to be solved by this invention be in prior art in data-driven displayer because row duration of charging deficiency causes gray level information to be lost, picture distortion, and then the data-driven method that a kind of displayer is provided.

For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:

The invention provides a kind of data-driven method, the row duration of charging according to different subframe arranges driving voltage value, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, increase the driving voltage value V of this subframe _di, make V _di>V _data; Wherein i represents subframe sequence number, V _datafor benchmark driving voltage.

Above-mentioned data-driven method, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, utilizing following formula to obtain increases multiple value A, A=charging time threshold G _ththe row duration of charging G of/this subframe _i; The driving voltage value increasing this subframe makes V _di>=A × V _data.

Above-mentioned data-driven method, first subframe is to the driving voltage value V of the 6th subframe _di=V _data, 1≤i≤6; The driving voltage value V of the 7th subframe _d7>=2V _data; The driving voltage value V of the 8th subframe _d8>=4V _data.

Above-mentioned data-driven method, the driving voltage value V of the 7th subframe _d7=2V _data; The driving voltage value V of the 8th subframe _d8=4V _data.

The present invention also provides a kind of data driver, according to above-mentioned data-driven method outputting drive voltage.

The present invention also provides a kind of displayer, adopts above-mentioned data driver outputting drive voltage.

Technique scheme of the present invention has the following advantages compared to existing technology:

(1) data-driven method of the present invention and data driver and displayer, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, increase the driving voltage value V of this subframe _di, make V _di>V _data; Wherein i represents subframe sequence number, V _datafor benchmark driving voltage, effectively can improve the pixel charging rate of the subframe of duration of charging deficiency, make it can complete charging in the short period of time, obtain luma data accurately, obtain gray level information accurately during to guarantee synthesising picture, can not color distortion be caused.

(2) data-driven method of the present invention and data driver and displayer, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, utilizing following formula to obtain increases multiple value A, A=charging time threshold G _ththe row duration of charging G of/this subframe _i; The driving voltage value increasing this subframe makes V _di>=A × V _data.Adopt above-mentioned set-up mode, can be that pixel just completes charging in the linear stage in duration of charging, effectively reduce the duration of charging of pixel, improve charging rate.

(3) data-driven method of the present invention and data driver and displayer, first subframe is to the driving voltage value V of the 6th subframe _di=V _data, 1≤i≤6, the driving voltage value V of the 7th subframe _d7=2V _data, the driving voltage value V of the 8th subframe _d8=4V _data.By above-mentioned setting, effectively can improve the charge efficiency of the 7th subframe and the 8th subframe, the power of consumption can not be made again excessive, can obtain luma data accurately, the gray level information of the picture finally obtained can not be lost, and color also can not distortion.

Accompanying drawing explanation

In order to make content of the present invention be more likely to be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,

Fig. 1 is the schematic diagram of picture synthesis in data driven technique;

Fig. 2 is each subframe time relations of distribution schematic diagram in available data Driving technique;

Fig. 3 is the relation schematic diagram of driving voltage corresponding to each subframe time relations of distribution described in one embodiment of the invention and each subframe;

Fig. 4 a and Fig. 4 b is that one embodiment of the invention subfield pixels charging rate and prior art neutron field pixel charging rate contrast schematic diagram;

Fig. 5 is a kind of structural representation of displayer.

Embodiment

embodiment 1

The present embodiment provides a kind of data-driven method, and the row duration of charging according to different subframe arranges driving voltage value, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, increase the driving voltage value V of this subframe _di, make V _di>V _data; Wherein i represents subframe sequence number, V _datafor benchmark driving voltage.

The row duration of charging in 8 subframes in each subframe has been calculated respectively in the application's background technology part.And for the display of different line number and columns, the charging time threshold corresponding to it may be different.As the displayer of 240 row, 320 row, its charging time threshold is about 0.9us.In the first six subframe, owing to having enough duration of charging, therefore can directly adopt benchmark driving voltage.Duration of charging deficiency be the 7th subframe and the 8th subframe.Now, when driving, increasing the driving voltage value of these two subframes, making it higher than benchmark driving voltage value, effectively can improve the pixel charging rate of the 7th subframe and the 8th subframe.And concrete driving voltage value rises to how many, can according to row duration of charging G _iwith charging time threshold G _thactual relationship determine, also to consider the power of display self simultaneously.

A kind of preferred version is provided, as the row duration of charging G of a certain subframe in the present embodiment _ibe less than charging time threshold G _thtime, utilizing following formula to obtain increases multiple value A, A=charging time threshold G _ththe row duration of charging G of/this subframe _i; The driving voltage value increasing this subframe makes V _di>=A × V _data.

Equally for the displayer of 240 row, 320 row, charging time threshold is about 0.9us, just with its charging time threshold G in the present embodiment _th=0.9us is example, G wherein ₇=0.43us, G ₈=0.215us, then for the 7th subframe A ≈ 2, for the 8th subframe A ≈ 4.Then when driving, driving voltage value as shown in Figure 3, makes:

First subframe is to the driving voltage value V of the 6th subframe _di=V _data, 1≤i≤6.

The driving voltage value V of the 7th subframe _d7>=2V _data, more but the faster power consumption of high charge speed is also larger for driving voltage value, preferred V in the present embodiment _d7=2V _data.

The driving voltage value V of the 8th subframe _d8>=4V _data, preferred V _d8=4V _data.

Fig. 4 a and Fig. 4 b gives in the 7th subframe time section t7, and employing driving voltage value is V _datawith employing driving voltage value be 2V _datacharging rate schematic diagram.Pixel charging process is divided into two stages, and 401 in figure, 402 is the frontier point in two stages.Shown in Fig. 4 a, from starting point to frontier point, belong to linear stage, fast at this stage pixel charging rate; Frontier point at the end of belong to saturation stage, this stage charging rate is slow.

For Fig. 4 a, need after charging complete to reach benchmark driving voltage value V _data.But due to the relation of time, it does not also complete the charging of linear stage, charging just terminates, and therefore t7 terminates the charging of rear pixel and also do not reach benchmark driving voltage value V _data.For Fig. 4 b, after charging complete, need the benchmark driving voltage value 2V reaching two times _data.Although the duration of charging is shorter, during charging complete, it does not also complete the charging of linear stage, just charges to benchmark driving voltage value V when linear stage _data, i.e. pixel charging complete at the end of charging.

Therefore, the such scheme that the present embodiment provides, effectively can improve the charge efficiency of the 7th subframe and the 8th subframe, obtain luma data accurately, and the gray level information of the picture finally obtained can not be lost, and color also can not distortion.

embodiment 2

The present embodiment provides a kind of data driver, at the row duration of charging G that a certain son is detectd _ibe more than or equal to charging time threshold G _thtime, its outputting drive voltage value is V _data, V _datafor benchmark driving voltage; At the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, its driving voltage value exported is V _diand V _di>V _data, wherein i represents subframe sequence number.

Above-mentioned data driver, when driving, increasing the driving voltage value of the subframe of duration of charging deficiency, making it higher than benchmark driving voltage value, to improve the pixel charging rate of corresponding subframe.And concrete driving voltage value rises to how many, can according to row duration of charging G _iwith charging time threshold G _thactual relationship determine, also to consider the power of display self simultaneously.

A kind of preferred version is provided, at the row duration of charging G of a certain subframe in the present embodiment _ibe less than charging time threshold G _thtime, its driving voltage value V exported _di>=A × V _data, wherein A=charging time threshold G _ththe row duration of charging G of/this subframe _i.

More preferably, first subframe is to the driving voltage value V that during the 6th subframe, it exports _di=V _data, 1≤i≤6.The driving voltage value V that during the 7th subframe, it exports _d7=2V _data, the driving voltage value V that during the 8th subframe, it exports _d8=4V _data.

Adopt above-mentioned data driver, effectively can improve the charge efficiency of the 7th subframe and the 8th subframe, obtain luma data accurately, the gray level information of the picture finally obtained can not be lost, and color also can not distortion.

embodiment 3

The present embodiment provides a kind of displayer, and structure as shown in Figure 5, comprising: multiple pixel, scanner driver and data driver.Multiple described pixels are arranged in the intersection region of scan control signal Sn1, Sn2 and Sn3 and data line D1 to Dm in the matrix form.

Meanwhile, display unit receives outside the first power supply ELVDD of providing and second source ELVSS.Wherein, the first power supply ELVDD is used as high level voltage source, and described second source ELVSS is used as low level voltage source.First power supply ELVDD and second source ELVSS is used as the driving power of pixel.

There is provided (such as, providing from timing control unit) described scanner driver to produce scan control signal Si1 to Sin by outside, and described scan control signal Si1 to Sin is sequentially supplied to pixel.

There is provided (such as, providing from timing control unit) described data driver to produce data and the corresponding data-signal of data controlling signal by outside, the data-signal D1 to Dm that described data driver produces and sweep signal are synchronously supplied to each pixel.

Displayer in the present embodiment, adopt the data driver outputting drive voltage described in embodiment 2 as data-signal D1-Dm, effectively can improve the charge efficiency of the 7th subframe and the 8th subframe, obtain luma data accurately, the gray level information of the picture finally obtained can not be lost, and color also can not distortion.

Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.

Claims (6)

1. a data-driven method, is characterized in that:

The row duration of charging according to different subframe arranges driving voltage value, as the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, increase the driving voltage value V of this subframe _di, make V _di>V _data; Wherein i represents subframe sequence number, V _datafor benchmark driving voltage.

2. data-driven method according to claim 1, is characterized in that:

As the row duration of charging G of a certain subframe _ibe less than charging time threshold G _thtime, utilizing following formula to obtain increases multiple value A, A=charging time threshold G _ththe row duration of charging G of/this subframe _i;

The driving voltage value increasing this subframe makes V _di>=A × V _data.

3. data-driven method according to claim 1 and 2, is characterized in that:

First subframe is to the driving voltage value V of the 6th subframe _di=V _data, 1≤i≤6;

The driving voltage value V of the 7th subframe _d7>=2V _data;

The driving voltage value V of the 8th subframe _d8>=4V _data.

4. data-driven method according to claim 3, is characterized in that:

The driving voltage value V of the 7th subframe _d7=2V _data;

The driving voltage value V of the 8th subframe _d8=4V _data.

5. a data driver, is characterized in that, according to the arbitrary described data-driven method outputting drive voltage of claim 1-4.

6. a displayer, is characterized in that, adopts data driver outputting drive voltage according to claim 5.