CN1471071A - Method for making organic LED display device present multi grey scales - Google Patents
Method for making organic LED display device present multi grey scales Download PDFInfo
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- CN1471071A CN1471071A CNA021407681A CN02140768A CN1471071A CN 1471071 A CN1471071 A CN 1471071A CN A021407681 A CNA021407681 A CN A021407681A CN 02140768 A CN02140768 A CN 02140768A CN 1471071 A CN1471071 A CN 1471071A
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Abstract
In the invention, a power supply circuit is connected to each data wire. Base on controlling each switch in the said power supply circuit, a synthesized current is supplied to data wire connected to drive each organic LED. The LED shows itself the effect of multi-gray levels caused by different current value.
Description
Technical field
(Organic Light EmittingDiode, display technique OLED) particularly relate to the driving method that the organic light emitting diode that makes in the display has different GTGs (gray level) to the present invention relates to organic luminuous dipolar object display.
Background technology
The known driving method that makes organic light emitting diode in the display have different GTGs has two kinds: the pulse wave width modulation method (Pulse Width Modulation, PWM), picture speed modulation method (Frame Rate Modulation, FRM).
The pulse wave width modulation method mainly is to use lighting the time of each organic light emitting diode of decision, and reaches the effect that each organic light emitting diode has different GTGs.Because organic light emitting diode is directly driven by electric current, more grow so light the time of organic light emitting diode when electric current, organic light emitting diode can be brighter, on the contrary, the time of lighting organic light emitting diode when electric current is shorter, and organic light emitting diode then can be healed secretly.
Picture speed modulation method mainly is to use the number of times of lighting of each organic light emitting diode of decision, and reaches the effect that each organic light emitting diode has different GTGs.Organic light emitting diode is driven by electric current, therefore be subjected to number of times that electric current lights the more when organic light-emittingdiode, the actual time of lighting that is added up also the more, so organic light emitting diode can be brighter, on the contrary, the number of times of lighting organic light emitting diode when electric current is fewer, and the actual time of lighting that is added up is then shorter, so organic light emitting diode then can be darker.
More than the characteristics of two kinds of known technologies, all be to utilize sweep trace to being cut apart the sweep time of organic light emitting diode, light the time or light number of times by the electric current that distributes each organic light emitting diode then, to reach the effect that display presents multiple GTG.Yet, these characteristics also are their greatest drawback, reason is: the electric current between each hour after the time is cut apart in the section, its reality is quite small, therefore cause the grayscale difference of each organic light emitting diode little, that is the light and shade comparative is not good, more can't present the effect of multiple GTG.
In addition, cutting apart of sweep time is to implement by improving the frequency that data line drives organic light emitting diode, and the raising of frequency can cause power consumption big, resistance one electric capacity (RC) effect of display itself also can heal greatly, is easy to generate brightness irregularities and interactive interference bad phenomenon such as (Crosstalk).And same brightness: use and cut apart sweep time because of the high expression of moment brightness all raisings relatively of electric current and voltage of moment, power consumption easily.
Summary of the invention
Purpose of the present invention mainly is to solve known technology can't make display present multiple GTG, and GTG and gloomy between shortcomings such as comparative is not good.
For achieving the above object, the present invention proposes a kind of method that makes organic luminuous dipolar object display present multiple GTG, this method comprises: this each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of circuit that circuit was formed in parallel by a switch series connection-current source; Cooperate the scanning motion of this each bar sweep trace, and control each switch in this each power supply circuit, supplying a resultant current, and drive this each organic light emitting diode to the data line that is connected.
The invention provides another kind makes organic luminuous dipolar object display present the method for multiple GTG, wherein this display have a plurality of sweep traces, a plurality of data lines, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line, and this each sweep trace scans this organic light emitting diode with the one scan time, this method comprises: this each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of by the connect circuit that circuit was formed in parallel of a current source of a switch; The scanning motion that cooperates this each bar sweep trace, and control the ON time of each switch in this each power supply circuit, supplying a resultant current to the data line that is connected, and drive this each organic light emitting diode, wherein this ON time is greatly less than this sweep time.
The invention provides another makes organic luminuous dipolar object display present the method for multiple GTG, wherein this display have a plurality of sweep traces, a plurality of data lines, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line, and this each sweep trace scans this organic light emitting diode with the one scan time, this method comprises: this each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of by the connect circuit that circuit was formed in parallel of a current source of a switch; The scanning motion that cooperates this each bar sweep trace, and the conducting number of times of each switch in this this each power supply circuit of inner control supplying a resultant current to the data line that is connected, and drive this each organic light emitting diode sweep time.
The size of current of i current source in the above-mentioned power supply circuit is 2
I-1Individual unitary current.
For understanding purpose of the present invention, feature and effect, now by following specific embodiment, and conjunction with figs., to the present invention illustrate in detail as after.
Description of drawings
Figure 1A is the synoptic diagram of a specific embodiment of the present invention.
Figure 1B is the various resultant current values that the power supply circuit of demonstration Figure 1A may be supplied.
Fig. 2 is presented at the various resultant currents that power supply circuit may be supplied in another specific embodiment of the present invention.Among the figure
100 power supply circuits, 108 organic light emitting diodes
102 power supply circuits, 110 organic light emitting diodes
104 power supply circuits, 112 organic light emitting diodes
106 power supply circuits, 114 organic light emitting diodes
Embodiment
Figure 1A is the synoptic diagram of a specific embodiment of the present invention.The display of Figure 1A have a plurality of sweep traces C1-Cn, a plurality of data lines S1-Sn, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line.Disclose simultaneously among the figure and use the required power supply circuit 100,102,104,106 of the inventive method, power supply circuit the 100,102,104, the 106th, a plurality of circuit that circuit was formed in parallel by a current source of a switch series connection, and be connected with data line S1, S2, S3, Sn respectively, as the major impetus that drives organic light emitting diode.
Power supply circuit 100,102,104,106 in Figure 1A all includes the current source that size of current is respectively 1I, 2I, 4I, wherein I represents a unitary current, the size of unitary current is to be determined by the deviser, and the design of the power power value of each size of current employing 2 is convenience and exploitativenesses of considering in the hardware design, but the size of current source and quantity are not to be subject to this embodiment.Power supply circuit 100,102,104,106 also comprises switch a, switch b, switch c, and similarly, the quantity of switch also is not subject to this example.
According to the inventive method, be the scanning motion that cooperates each bar sweep trace, and control each switch in each power supply circuit, supplying a resultant current, and drive each organic light emitting diode to the data line that is connected.With Figure 1A is example, sweep trace C1 is just carrying out scanning motion, switch a conducting (on) with time control power supply circuit 100, switch b and switch c open circuit (off), the switch a and the switch b conducting (on) of control power supply circuit 102, switch c open circuit (off), the switch a and the switch c conducting (on) of control power supply circuit 104, switch b open circuit (off), the switch a of control power supply circuit 106, switch b and the whole conductings of switch c (on), so power supply circuit 100,102,104,106 will supply 1I respectively, 3I, 5I, the electric current of 7I, organic light emitting diode 108,110,112,114 also are subjected to the driving of above electric current respectively and presenting of different GTGs are arranged.Figure 1B then further points out the various resultant current values that the power supply circuit of figure lA may be supplied.
Another specific embodiment of the present invention is the modulation principle of the above-mentioned two kinds of known technologies of collocation, and makes under the condition of current source fixed amount, can produce more resultant current value, makes organic light emitting diode can present more kinds of GTG values.If collocation pulse wave width modulation method, then carry out the following step: the scanning motion that cooperates each bar sweep trace, and control the ON time of each switch in each power supply circuit, to supply a resultant current to the data line that is connected, and drive this each organic light emitting diode, wherein this ON time is not more than the sweep time of sweep trace; If collocation picture speed modulation method, then carry out the following step: the scanning motion that cooperates each bar sweep trace, and the conducting number of times of each switch in sweep time each power supply circuit of inner control, supplying a resultant current, and drive each organic light emitting diode to the data line that is connected.
Fig. 2 shows the present invention behind two kinds of known technologies of collocation, the various resultant current values that power supply circuit may be supplied.
Now it is as follows to conclude characteristics of the present invention:
Do not need too high driving frequency, therefore can avoid resistance-capacitance (PC) effect, and can not produce interactive interference (Crosstalk).
Can effectively improve the demonstration contrast of display.
Power consumption is low.
Can be by the quantity that increases current source, provide higher GTG value to organic light emitting diode.
The modulation principle of known technology of can arranging in pairs or groups, and make under the condition of current source fixed amount, produce more resultant current value, make organic light emitting diode can present more kinds of GTG values.
Though the present invention discloses as above with a specific embodiment; right its is not in order to limit the present invention; anyly be familiar with this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (6)
1. method that makes organic luminuous dipolar object display present multiple GTG, wherein this display have a plurality of sweep traces, a plurality of data lines, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line, this method comprises the following steps:
This each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of by the connect circuit that circuit was formed in parallel of a current source of a switch;
Cooperate the scanning motion of this each bar sweep trace, and control each switch in this each power supply circuit, supplying a resultant current, and drive this each organic light emitting diode to the data line that is connected.
2. the method for claim 1, wherein the size of current of i current source in this power supply circuit is 2
I-1Individual unitary current (I).
3. method that makes organic luminuous dipolar object display present multiple GTG, wherein this display have a plurality of sweep traces, a plurality of data lines, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line, and this each sweep trace scans this organic light emitting diode with the one scan time, and this method comprises the following steps:
This each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of by the connect circuit that circuit was formed in parallel of a current source of a switch;
The scanning motion that cooperates this each bar sweep trace, and control the ON time of each switch in this each power supply circuit, supplying a resultant current to the data line that is connected, and drive this each organic light emitting diode, wherein this ON time is greatly less than this sweep time.
4. method as claimed in claim 3, wherein the size of current of i current source in this power supply circuit is 2
I-1Individual unitary current (I).
5. method that makes organic luminuous dipolar object display present multiple GTG, wherein this display have a plurality of sweep traces, a plurality of data lines, with a plurality of organic light emitting diodes that driven by this sweep trace and this data line, and this each sweep trace scans this organic light emitting diode with the one scan time, and this method comprises the following steps:
This each bar data line is connected a power supply circuit respectively, and wherein this each power supply circuit is a plurality of by the connect circuit that circuit was formed in parallel of a current source of a switch;
The scanning motion that cooperates this each bar sweep trace, and the conducting number of times of each switch in this this each power supply circuit of inner control supplying a resultant current to the data line that is connected, and drive this each organic light emitting diode sweep time.
6. method as claimed in claim 5, wherein the size of current of i current source in this power supply circuit is 2
I-1Individual unitary current (I).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021407681A CN1471071A (en) | 2002-07-24 | 2002-07-24 | Method for making organic LED display device present multi grey scales |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021407681A CN1471071A (en) | 2002-07-24 | 2002-07-24 | Method for making organic LED display device present multi grey scales |
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| CN1471071A true CN1471071A (en) | 2004-01-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101996588A (en) * | 2010-11-15 | 2011-03-30 | 华映视讯（吴江）有限公司 | Backlight module and driving circuit |
| CN101159118B (en) * | 2006-10-02 | 2011-08-10 | 精工爱普生株式会社 | Light-emitting device and image forming apparatus |
| CN101340758B (en) * | 2007-07-03 | 2011-11-30 | 索尼株式会社 | Control device and control method, and planar light source and control method of planar light source |
| CN113920928A (en) * | 2021-10-29 | 2022-01-11 | 重庆惠科金渝光电科技有限公司 | Display panel driver and display device |
| WO2024087396A1 (en) * | 2022-10-24 | 2024-05-02 | Dynascan Technology Corp. | Display apparatus including led array |
-
2002
- 2002-07-24 CN CNA021407681A patent/CN1471071A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159118B (en) * | 2006-10-02 | 2011-08-10 | 精工爱普生株式会社 | Light-emitting device and image forming apparatus |
| CN101340758B (en) * | 2007-07-03 | 2011-11-30 | 索尼株式会社 | Control device and control method, and planar light source and control method of planar light source |
| CN101996588A (en) * | 2010-11-15 | 2011-03-30 | 华映视讯（吴江）有限公司 | Backlight module and driving circuit |
| CN101996588B (en) * | 2010-11-15 | 2013-04-24 | 华映视讯（吴江）有限公司 | Backlight module and driving circuit |
| CN113920928A (en) * | 2021-10-29 | 2022-01-11 | 重庆惠科金渝光电科技有限公司 | Display panel driver and display device |
| CN113920928B (en) * | 2021-10-29 | 2022-07-12 | 重庆惠科金渝光电科技有限公司 | Display panel driver and display device |
| WO2024087396A1 (en) * | 2022-10-24 | 2024-05-02 | Dynascan Technology Corp. | Display apparatus including led array |
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