CN1917003A - Method and devices cpable of lowering power consumption for driving display - Google Patents

Abstract

A driving method being able to lower power consumption of display includes setting a internal memory enabling to store display data temporarily and a logic unit connected to internal memory in control module, utilizing logic unit to set grey level image data of a current on-state line to be reference line, comparing said reference line with n lines of grey level image data being stored in internal memory temporarily and being arranged to be scanned, selecting sequence with minimum grey level D-value as next on-state line for lowering power consumption because grey level variation between two on-state lines is minimum.

Description

Display drive method and device that cpable of lowering power consumes

Technical field

The present invention is a kind of method that scans that is applied to drive device for display, refers to especially a kind ofly determine the mode of scanning sequency with the grayscale difference according to image data, to reduce power consumers.

Background technology

As shown in Figure 2, it is the type of drive synoptic diagram of a known thin display, slim panel 50 generally is to utilize a delegation's driver module 62 and a row driver module 64 to intersect to control, and row driver module 62 is to be connected with a plurality of data lines 63, and row driver module 64 then provides multi-strip scanning line 65.Wherein, be to be formed with the multiple spot picture element on this slim panel 50, each picture element 51 is corresponding to both crossover locations of a data line 63 and sweep trace 65.

When the slim panel 50 of control makes its image output, aforementioned row driver module 64 is to send in regular turn to scan signal to sweep trace 65, in 51 GTG signals of being exported according to its data line 63 separately of same each picture element that lists, decision is to desire to carry out the charge or discharge action, because the renewal speed of scanning is exceedingly fast, utilize the persistence of vision impression of human eye just can on slim panel 50, present an image output with stable image quality.

Along with high-resolution thin display comes out, picture element 51 numbers on the slim panel 50 of the person of meaning increase relatively, therefore under the constant situation of frame updating frequency, each bar scanning linear 65 assigned ON time shortens relatively, in the so short time, each picture element 51 just is difficult to reach charge/discharge completely, promptly is that contrast declines to a great extent to the influence of picture quality.Moreover, the problem that slim panel 50 another factors that must consider promptly are power consumptions.As previously mentioned, known row driver element 60 be from first to last in regular turn the output scanning signal to those sweep traces 65, therefore when there is huge gray scale variation in the picture element 51 on the two adjacent sweep traces 65, to move caused power consumption problem obvious especially because of extreme charge/discharge.

For the portable electron device of lightweight and portable in volume, for example personal mobile phone, digital aid (PDA), digital music broadcasting machine (MP3 Player) etc., slim display panel become the standard package that these digital devices show as data already.Angle with the research and development improvement, aforementioned means must be considered the power consumption problem that faces when the consumer uses, therefore, if the consumed power of this slim display panel is able to effective reduction, also can make the power consumption of single unit system can obtain benefiting to a certain degree.

Summary of the invention

When the GTG signal significantly changed, its power consumption improved relatively in view of traditional driving method that is applied to display pannel, and fundamental purpose of the present invention is the technology that a kind of non-scanning of conducting one by one is provided, and uses the power consumption that reduces drive unit.

For reaching aforementioned purpose, the present invention utilizes a driving device controls one to be formed with the display panel of most picture elements, and this drive unit comprises:

Delegation's driver element is that output has the complex data line to this panel;

One row driver element is that output has plural sweep trace to this panel, and intersects with the aforesaid data line and to control plural picture element on this panel;

One control module, be to connect aforementioned capable driver element and row driver element, this control module includes the arithmetic logic unit that the internal memory and that can keep in display data connects this internal memory, this arithmetic logic unit is that the grey-tone image data that is listed as with a present conducting is a reference column, compare with being temporary in n row grey-tone image data to be scanned in the internal memory with this reference column, selected total GTG difference reckling is next conducting row.

Aforementioned reference column can compare with its row grey-tone image data all to be shown one by one to calculate the GTG difference, and be next conducting row in wherein selecting total GTG difference reckling, classify reference column and other sequence calculating GTG difference to be shown as with this conducting again, all finish a complete scanning update cycle up to whole m column scan lines.

Aforementioned reference column can with a part its row grey-tone image data to be shown relatively, and first classify next conducting row as in what wherein select total GTG difference minmal sequence, classify reference column and another part column count GTG difference to be shown as with this conducting again, so repeat all to finish a complete scanning update cycle up to whole m column scan lines.

By total GTG difference of each row image data of comparison, be to find out only conducting scanning sequency, effectively reduced power attenuation.

Description of drawings

Fig. 1: be circuit block diagram of the present invention.

Fig. 2: the type of drive synoptic diagram that is a known display.

[primary clustering symbol description]

10-control module 11-internal memory

The 12-arithmetic logic unit

The slim panel 51-of 50-picture element

The capable driver element 63-of 62-data line

64-row driver element 65-sweep trace

Embodiment

See also shown in Figure 1, circuit block diagram for one embodiment of the invention, one slim panel 50 utilizes delegation's driver element 62 and 64 controlling and driving of a row driver element equally, plural sweep trace 65 and data line 63 by row driver element 62 and 64 outputs of row driver element are to intersect to control the plural picture element 51 that is arranged on this slim panel 50, in the present invention, being that the extra control module 10 that adds determines to scan order except that aforementioned basic module, is to include the arithmetic logic unit 12 that the internal memory 11 and that can keep in display data connects this internal memory 11 in this control module 10.

As can be known when the GTG data gap of two adjacent column greatly the time, power consumption obviously increases in the explanation of aforementioned known techniques.Therefore, if can avoid earlier, when total GTG data of two adjacent column of back conducting has significant change, just can effectively save power attenuation, based on above notion, the practice of the present invention is as follows:

Image data temporary to be shown is in this internal memory 11;

Read temporary image data and export arithmetic logic unit 12 to from internal memory 11;

Row image data GTG value during comparison is just scanning at present and the image data GTG value of other row to be scanned are to calculate both total GTG value difference distances;

The total GTG value difference of this row image data in selecting and scanning at present is apart from its row image data of minimum, as next row image data that scans;

Repeat above-mentioned steps, all shown up to the image data of each row and finished.

Be the aforementioned practice of specific explanations, below will list several different embodiment of the present invention:

At first, for two different lines Row _i, Row _jTotal GTG data difference, be to be expressed as:

${\mathrm{GLD}}_{\left(\mathrm{ij}\right)}=\underset{k=1}{\overset{n}{\mathrm{\Σ}}}|D_{\mathrm{ik}}-D_{\mathrm{jk}}|$

Wherein, D is represented as the GTG value of each point picture element (pixel), generally is to represent (2 with m bit ^m), and have n picture element in the row, in two different lines (i, j) in the GTG difference of corresponding pixel points be | D _Ik-D _Jk|, and with after the GTG difference addition of being had a few, just be two different lines Row _i, Row _jTotal GTG data difference GLD _(ij)Simplifying under the considering of computing, though the GTG of each point picture element is to represent with m bit, during actual operation, the tangible GTG value (being high bit MSB) of desirable its effect, and ignore it, for example a than low level (LSB) ₅a ₄a ₃a ₂a ₁a ₀-b ₅b ₄b ₃b ₂b ₁b ₀The time, a of two numerical value ₁a ₀, b ₁b ₀The position is to ignore, and only gets preceding four and compares.

Practice A: suppose that the 1st classifies present conducting row as, then utilize aforementioned arithmetic logic unit 12 to calculate indivedual and the 1st total GTG difference GLD that is listed as of the 2nd to s row ₍₂₁₎, GLD ₍₃₁₎... GLD _(s1), and in these differences taking-up recklings.If GLD ₍₃₁₎Be minimum value, the 3rd row promptly are chosen to be the next column of desiring conducting, then more relatively the 2nd, the difference GLD of 4-s row and the 3rd row ₍₂₃₎, GLD ₍₄₃₎... GLD _(s3), take out reckling as the next column of desiring conducting in these differences again.So constantly repeat comparison, up to finishing a complete scan period.

Practice B: this kind practice is to make aforementioned arithmetic logic unit 12 be compared with the image data of present conducting row and the image data of all the other N row at least two row, in these two row, select total GTG difference smaller as next conducting row, and not selected person is temporary in still in the internal memory 11.

Classify benchmark as with this conducting of selecting, be temporary in the row image data comparison that the row image data and in the internal memory 11 newly reads in, get total GTG difference smaller again and be next conducting row, so repeat to be listed as all been scanned up to each with this.

With two row data is example (N=2), if the 1st row are classified in conducting at present as, then compares total GTG difference GLD of the 2nd, 3 liang of row and the 1st row ₍₂₁₎, GLD ₍₃₁₎, if GLD ₍₃₁₎＜GLD ₍₂₁₎, then the selected the 3rd classify next conducting row as.And the 2nd row image data still is temporary in the internal memory 11, and reads in the 4th new row image data, and calculates the GTG difference GLD of 2,4 liang of row and the 3rd row ₍₂₃₎, GLD ₍₄₃₎, so repeat.

Yet, to two kinds of practices of aforementioned A, B, for the image data of avoiding a certain row slowly can't be switched on the display quality that scanning influences picture, this control module 10 is to have the function that the scanning of forcing is upgraded, in the specific time, even the GTG difference that should be listed as is undesirable, still force this row conducting to upgrade to keep preferable image output.

Practice C: be the columns GTG data in some, obtain the conducting order of full blast, the method is to be limited to earlier when carrying out the GTG comparisons, and N columns data is compared, and obtains its best conducting order.For example, if be listed as considering Row with 4 ₁, Row ₂, Row ₃, Row ₄, and conducting person is the 1st row at present, then calculates following each value:

SGLD _{(1→2→3→4)}＝GLD ₍₂₁₎+GLD ₍₃₂₎+GLD ₍₄₃₎

SGLD _{(1→2→4→3)}＝GLD ₍₂₁₎+GLD ₍₄₂₎+GLD ₍₃₄₎

SGLD _{(1→3→2→4)}＝GLD ₍₃₁₎+GLD ₍₂₃₎+GLD ₍₄₂₎

SGLD _{(1→3→4→2)}＝GLD ₍₃₁₎+GLD ₍₄₃₎+GLD ₍₂₄₎

SGLD _{(1→4→2→3)}＝GLD ₍₄₁₎+GLD ₍₂₄₎+GLD ₍₃₂₎

SGLD _{(1→4→3→2)}＝GLD ₍₄₁₎+GLD ₍₃₄₎+GLD ₍₂₃₎

Above-mentioned six SGLD numeric representations under different conductings order, may the arranging of the gray scale variation total value of this 4 row image data, wherein the numerical value reckling is promptly represented best conducting order.After the order decision of 1-4 row, classify reference column as with that of last conducting again, with the mutual conducting order of obtaining full blast of comparing of 5-7 row, with this way, N row data is compared for one group, all each row all calculate and finish on panel, and this way can avoid two kinds of practices of aforementioned A, B to have wherein the row slowly can't conducting, and then influence the shortcoming of picture quality.

The present invention scans the power consumption problem that is caused in view of tradition by row, so total GTG difference by each row image data of comparison, find out only conducting scanning sequency by this, be effectively to improve to commonly use shortcoming and possess tangible effect and promote, so in meeting under the patent of invention important document prerequisite, file an application in whence mere formality in accordance with the law.

Only the above person only is preferred embodiment of the present invention, when can not with restriction category of the present invention.Promptly the equalization of being done according to the present patent application claim generally changes and modifies, and will not lose main idea of the present invention place, does not also break away from the spirit and scope of the present invention, so all should be considered as further enforcement situation of the present invention.Therefore protection scope of the present invention is accurate for complying with when looking accompanying the claim person of defining of institute.

Claims (6)

1. the display drive method that consumes of a cpable of lowering power, this display is to have m column scan line, it is characterized in that, wherein, this driving method is that the grey-tone image data that makes a present conducting be listed as is a reference column, with this reference column and n row grey-tone image data comparison to be scanned, the sequence of selected GTG difference summation minimum is next conducting row.

2. the display drive method that consumes as cpable of lowering power as described in 1 of the claim the, it is characterized in that, this reference column is to compare one by one to calculate the GTG difference with its row grey-tone image data all to be shown, and, all finish a complete scanning update cycle up to whole m column scan lines in wherein selecting total GTG difference reckling for next conducting row.

3. the display drive method that consumes as cpable of lowering power as described in 1 of the claim the, it is characterized in that, this reference column is its row grey-tone image data comparison to be shown with a part, and be next conducting row in wherein selecting total GTG difference reckling, so repeat all to finish a complete scanning update cycle up to whole m column scan lines.

4. the display drive method that consumes as cpable of lowering power as described in claim the 2 or 3 is characterized in that, Xuan Ding row to be scanned are not can force to carry out conducting and scan.

5. the display drive method that consumes of a cpable of lowering power, it is characterized in that, be to classify the m column scan line of a display as a group of unit with N to compare, and the sweep trace of last conducting of including last group in is for waiting to judge a datum line of group at present, and multiple calculating waits to judge (N+1) of the N bar sweep trace of group at present! Planting the GTG difference summation of permutation and combination order, get its GTG difference summation reckling, is the conducting order of this group's sweep trace.

6. the drive device for display that cpable of lowering power consumes is characterized in that, is the panel that control one forms plural picture element, and this drive unit comprises:

Delegation's driver element is that output has the complex data line to this panel;

One row driver element is that output has plural sweep trace to this panel, and intersects with the aforesaid data line and to control plural picture element on this panel;

One control module, be to connect aforementioned capable driver element and row driver element, this control module includes the arithmetic logic unit that the internal memory and that can keep in display data connects this internal memory, this arithmetic logic unit is that the grey-tone image data that is listed as with a present conducting is a reference column, compare with being temporary in n row grey-tone image data to be scanned in the internal memory with this reference column, the sequence of selected total GTG difference minimum is next conducting row.