CN203773913U - Pixel unit drive circuit, display substrate, display panel, and display device - Google Patents
Pixel unit drive circuit, display substrate, display panel, and display device Download PDFInfo
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- CN203773913U CN203773913U CN201420192041.0U CN201420192041U CN203773913U CN 203773913 U CN203773913 U CN 203773913U CN 201420192041 U CN201420192041 U CN 201420192041U CN 203773913 U CN203773913 U CN 203773913U
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Abstract
The utility model, which belongs to the technical field of displaying, provides a pixel unit drive circuit, a display substrate, a display panel, and a display device. Therefore, a problem of high power consumption of the existing pixel unit drive circuit can be solved. The pixel unit drive circuit comprises a plurality of pixel units; each pixel unit includes sub pixels with different colors; and each sub pixel includes a driver transistor and an organic electroluminescent device corresponding to the color of the sub pixel. Besides, the pixel unit drive circuit also includes a plurality of drive power supplies corresponding to the sub pixel with different colors; the sub pixels with the same colors are connected to the same drive power supply; and each drive power supply is used for providing a corresponding drive voltage for the sub pixel with the color corresponding to the drive power supply. In addition, the display substrate includes the pixel unit drive circuit; the display panel includes the display substrate; and the display device includes the display panel.
Description
Technical Field
The utility model belongs to the technical field of show, concretely relates to pixel unit drive circuit, display substrate, display panel and display device.
Background
Compared with the current mainstream Display technology Thin Film transistor liquid Crystal Display (TFT-LCD), the Organic Light Emitting Display (OLED) has the advantages of wide viewing angle, high brightness, high contrast, low energy consumption, lighter and thinner volume, and the like, and is a focus of the current flat panel Display technology.
Driving methods of the organic light emitting display are classified into a Passive Matrix (PM) and an Active Matrix (AM). Compared with passive matrix driving, active matrix driving has the advantages of large information display amount, low power consumption, long service life of devices, high picture contrast and the like. An equivalent circuit of the basic principle of a pixel unit driving circuit of an active matrix organic light emitting display in the prior art, as shown in fig. 1, includes: a switching transistor M1, a driving transistor M2, a storage capacitor C1, and a light emitting device D1. The drain electrode of the switching transistor M1 is connected with the gate electrode of the driving transistor M2; the gate of the driving transistor M2 is connected to one end of the storage capacitor C1, the source thereof is connected to the other end of the storage capacitor C1, and the drain thereof is connected to the light emitting device D1. The switching transistor M1 is turned on when the gate is gated by the scan signal vscan (n), and the data signal Vdata is introduced from the source. The driving transistor M2 generally operates in a saturation region, and its gate-source voltage Vgs determines the magnitude of current flowing through it, thereby providing a stable current to the light emitting device D1. Wherein Vgs = Vdata-VD1, VD1 is the voltage drop when the light emitting device D1 displays the highest gray scale luminance, VDD is the regulated or regulated power supply voltage, and is connected to the driving transistor M2 for supplying the energy required by the light emitting device D1 to emit light. And the storage capacitor C1 is used to keep the gate voltage of the driving transistor M2 stable during one frame.
A typical pixel cell driving circuit for an organic light emitting display includes sub-pixel cells of three different colors, red, green and blue (R, G, B), as shown in fig. 2, as can be readily seen, the pixel unit driving circuit of the organic light emitting display drives the red organic electroluminescent display device DR, the blue organic electroluminescent display device DB, and the green organic electroluminescent display device DG on the pixel unit driving circuit using the driving voltage VDD of the same driving power source (the voltage of the driving power source is the driving voltage capable of driving the blue organic electroluminescent device DB brightest due to different light emitting materials, as shown in fig. 3), however, since the semiconductor materials of the light emitting layers of the three organic electroluminescent devices of different colors are different, the voltage drops of the three organic electroluminescent devices of different colors are different. As can be easily seen from fig. 3, when the three colors have the same display brightness, the voltage drop of the blue organic electroluminescent display device DB is greater than that of the red organic electroluminescent display device DR and greater than that of the green organic electroluminescent display device DG, and at this time, since the pixel unit driving circuit of the organic electroluminescent display uses the same driving power voltage to drive the three organic electroluminescent devices of different colors on the display, thus, the voltage drop across the driving transistor TG of the green sub-pixel unit is large, the driving transistor TR of the red sub-pixel unit is next to the driving transistor TR of the blue sub-pixel unit, and finally the driving transistor TB of the blue sub-pixel unit is minimum, further, the power consumption of the driving transistor TG of the green sub-pixel unit is too large, which causes the waste of energy, and the driving transistor bias voltages of the three different color sub-pixel units are different, so that the driving capability of the driving transistor cannot reach the optimum.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve includes, to the great problem of current pixel unit drive circuit consumption, provides a pixel unit drive circuit, display substrate, display panel and the display device who practices thrift the consumption and can improve the driving force of driving transistor.
The utility model provides a technical scheme that technical problem adopted is a pixel unit drive circuit, and it includes a plurality of pixel units, and every pixel unit includes the sub-pixel of different colours, every the sub-pixel includes drive transistor and the organic electroluminescent device who corresponds with this sub-pixel colour, and this pixel unit drive circuit still includes a plurality of drive power supply who corresponds with different colour sub-pixel, wherein, same colour the sub-pixel is connected same drive power supply, every drive power supply is used for providing corresponding drive voltage with the sub-pixel that this drive power supply corresponds the colour.
The utility model discloses a different drive power supply is connected to the sub-pixel of different colours among the pixel unit drive circuit, can select drive power supply according to sub-pixel's colour this moment and provide corresponding drive voltage for sub-pixel, and then can make the drive transistor among every sub-pixel go up the voltage that divides on the drive transistor among the relative prior art of voltage reduce, thereby can reduce drive transistor's consumption, pixel unit drive circuit's holistic consumption also reduces thereupon this moment of course.
Preferably, the driving voltage of each driving power supply is equal to the sum of the voltage drop of the organic electroluminescent device in the corresponding sub-pixel displaying the highest gray-scale brightness and the bias voltage of the driving transistor.
Preferably, each of the pixel units includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel; wherein,
the red sub-pixel comprises a red organic electroluminescent device and a driving transistor;
the green sub-pixel comprises a green organic electroluminescent device and a driving transistor;
the blue sub-pixel includes a blue organic electroluminescent device and a driving transistor.
It is further preferable that the pixel unit driving circuit includes a first driving power supply, a second driving power supply, and a third driving power supply; wherein,
the driving voltage of the first driving power supply is equal to the sum of the voltage drop of the red organic electroluminescent device displaying the highest gray scale brightness and the bias voltage of the driving transistor;
the driving voltage of the second driving power supply is equal to the sum of the voltage drop of the green organic electroluminescent device displaying the highest gray-scale brightness and the bias voltage of the driving transistor;
and the driving voltage of the third driving power supply is equal to the sum of the voltage drop of the blue organic electroluminescent device displaying the highest gray-scale brightness and the bias voltage of the driving transistor.
Still further preferably, the driving voltage of the first driving power source is greater than the driving voltage of the second driving power source, and the driving voltage of the third driving power source is greater than the driving voltage of the first driving power source.
The technical scheme who solves the technical problem of the utility model is a display substrate, it includes pixel element drive circuit.
Because the utility model discloses a display substrate includes above-mentioned pixel drive circuit, so it can save the reduction power consumption.
Solve the technical problem the utility model discloses the technical scheme that technical problem adopted is a display panel, and it includes above-mentioned display substrate.
Because the utility model discloses a display panel includes above-mentioned display substrate, so it can reduce the consumption, improves with drive transistor's driving force, and then can improve display effect.
Solve the technical problem the utility model discloses the technical scheme that technical problem adopted is a display device, and it includes above-mentioned display panel.
Because the utility model discloses a display device includes above-mentioned display panel, so its display effect is better, reduces the consumption simultaneously.
Drawings
FIG. 1 is a circuit diagram of driving each sub-pixel unit in a pixel unit driving circuit of a conventional organic light emitting display;
fig. 2 is an equivalent circuit of the basic principle of a pixel unit driving circuit of a conventional organic light emitting display;
FIG. 3 is a graph of luminance versus voltage drop for red, green, and blue organic electroluminescent devices;
fig. 4 is a partial schematic diagram of a basic principle of a driving circuit of a pixel unit according to embodiment 1 of the present invention.
Wherein the reference numerals are: m1, a switching transistor; m2, a drive transistor; d1, organic electroluminescent device; VDD, a drive power supply; VDD1, a first driving power supply; VDD2, second drive power supply; VDD3, third drive power supply; TR, a drive transistor on the red subpixel; TG, a drive transistor on the green sub-pixel; TB, a driving transistor on the blue sub-pixel; DR, red organic electroluminescent device; DG. A green organic electroluminescent device; DB. A blue organic electroluminescent device.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
the embodiment provides a pixel unit driving circuit, which includes a plurality of pixel units, each pixel unit includes sub-pixels with different colors, each sub-pixel includes a driving transistor and an organic electroluminescent device corresponding to the color of the sub-pixel, the pixel unit driving circuit further includes a plurality of driving power supplies corresponding to the sub-pixels with different colors, wherein the sub-pixels with the same color are connected to the same driving power supply, and each driving power supply is used for providing a corresponding driving voltage for the sub-pixel with the color corresponding to the driving power supply.
It will be understood by those skilled in the art that the driving voltage provided by the driving power source may be at least equal to the maximum luminance of the organic electroluminescent device connected to the driving power source. Since the driving voltages of the organic electroluminescent devices with different colors at the time of maximum brightness are different, in this embodiment, the sub-pixels with different colors are connected to different driving power supplies, and at this time, the driving power supplies can be selected according to the colors of the sub-pixels to provide corresponding driving voltages for the sub-pixels, so that the voltage divided by the driving transistor in each sub-pixel can be reduced compared with the voltage divided by the driving transistor in the prior art, and thus the power consumption of the driving transistor can be reduced, and at this time, the overall power consumption of the pixel unit driving circuit is also reduced.
In the present embodiment, the driving voltage of each driving power supply is equal to the sum of the voltage drop when the organic electroluminescent device in the sub-pixel corresponding thereto displays the highest gray-scale luminance and the bias voltage of the driving transistor. As will be understood by those skilled in the art, the bias voltage refers to a voltage that should be set between the base and the emitter (gate-source) and between the collector and the base (drain-gate) when the transistor is in an amplifying state in the transistor amplifying circuit. At this time, the power consumption of the pixel unit driving circuit can be reduced as much as possible, and the driving capability of each driving transistor can be improved.
As shown in fig. 4, in the present embodiment, it is preferable that each of the pixel units in the pixel unit driving circuit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel; wherein the red sub-pixel includes a red organic electroluminescent device DR and a driving transistor TR; the green sub-pixel includes a green organic electroluminescent device DG and a driving transistor TG; the blue sub-pixel includes a blue organic electroluminescent device DB and a driving transistor TB. At this time, it is further preferable that the pixel cell driving circuit includes a first driving power supply VDD1, a second driving power supply VDD2, a third driving power supply VDD 3; wherein, the driving voltage of the first driving power supply VDD1 is equal to the sum of the voltage drop of the red organic electroluminescent device DR displaying the highest gray-scale brightness and the bias voltage of the driving transistor TR; the driving voltage of the second driving power supply VDD2 is equal to the sum of the voltage drop of the green organic electroluminescent device DG displaying the highest gray-scale brightness and the bias voltage of the driving transistor TG; the driving voltage of the third driving power supply VDD3 is equal to the sum of the voltage drop when the blue organic electroluminescent device DB displays the highest gray-scale luminance and the bias voltage of the driving transistor TB. At this time, the voltage drop (V) of the three colors of organic electroluminescent devices displaying the highest gray scale brightness is different due to the different luminescent materials of the three colors of organic electroluminescent devicesOLEDG<VOLEDR<VOLEDB) At this time, it is further preferable that the driving voltage of the first driving power VDD1 is greater than the driving voltage of the second driving power VDD2, and the driving voltage of the third driving power VDD3 is greater than the driving voltage of the first driving power VDD 1. Wherein, it is noted that different colorsThe driving transistors in the sub-pixels are of the same type, and are denoted by TR, TG, TB for the sake of distinction among the different sub-pixels.
It should be noted that, in this embodiment, each sub-pixel includes a driving transistor and an organic electroluminescent device, but each sub-pixel also includes only a driving transistor and an organic electroluminescent device, and it also includes a switching transistor and a storage capacitor (for example, the sub-pixel unit of 2T1C shown in fig. 1, and may also be a sub-pixel unit of 6T2C, etc.), which is not illustrated in the drawings of this embodiment, because the switching transistor is equivalent to a conducting wire when turned on, and only transmits different data signals to the organic electroluminescent device to adjust the brightness of the organic electroluminescent device, that is, to implement display of different gray scales.
The pixel unit driving circuit of the embodiment can reduce power consumption and improve the driving capability of the thin film transistor.
Example 2:
this embodiment provides a display substrate including the pixel unit driving circuit described in embodiment 1.
Since the display substrate of this embodiment includes the pixel unit driving circuit of embodiment 1, the power consumption is low and the performance is better.
Of course, the display substrate of this embodiment further includes other known elements such as gate lines and data lines.
Example 3:
the present embodiment provides a display panel including the display substrate according to embodiment 2.
Since the display panel of this embodiment includes the display substrate of embodiment 2, the power consumption is low and the performance is good.
Example 4:
the present embodiment provides a display device, which includes the display panel of embodiment 3, and the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The display device of this embodiment has the display panel of embodiment 3, so the power consumption is low and the performance is good.
Of course, other conventional structures, such as a power supply unit, a display driving unit, and the like, may also be included in the display device of the present embodiment.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A pixel unit driving circuit comprises a plurality of pixel units, each pixel unit comprises sub-pixels with different colors, each sub-pixel comprises a driving transistor and an organic electroluminescent device corresponding to the color of the sub-pixel, the pixel unit driving circuit is characterized by further comprising a plurality of driving power supplies corresponding to the sub-pixels with different colors, the sub-pixels with the same color are connected with the same driving power supply, and each driving power supply is used for providing corresponding driving voltage for the sub-pixels with the color corresponding to the driving power supply.
2. The pixel unit driving circuit according to claim 1, wherein the driving voltage of each driving power supply is equal to the sum of the voltage drop when the organic electroluminescent device in the corresponding sub-pixel displays the highest gray-scale luminance and the bias voltage of the driving transistor.
3. The pixel cell driving circuit according to claim 1, wherein each of the pixel cells comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel; wherein,
the red sub-pixel comprises a red organic electroluminescent device and a driving transistor;
the green sub-pixel comprises a green organic electroluminescent device and a driving transistor;
the blue sub-pixel includes a blue organic electroluminescent device and a driving transistor.
4. The pixel cell driving circuit according to claim 3, wherein the driving power source comprises a first driving power source, a second driving power source, a third driving power source; wherein,
the driving voltage of the first driving power supply is equal to the sum of the voltage drop of the red organic electroluminescent device displaying the highest gray scale brightness and the bias voltage of the driving transistor;
the driving voltage of the second driving power supply is equal to the sum of the voltage drop of the green organic electroluminescent device displaying the highest gray-scale brightness and the bias voltage of the driving transistor;
and the driving voltage of the third driving power supply is equal to the sum of the voltage drop of the blue organic electroluminescent device displaying the highest gray-scale brightness and the bias voltage of the driving transistor.
5. The pixel cell driving circuit according to claim 4, wherein the driving voltage of the first driving power supply is greater than the driving voltage of the second driving power supply, and the driving voltage of the third driving power supply is greater than the driving voltage of the first driving power supply.
6. A display substrate comprising the pixel cell driving circuit according to any one of claims 1 to 5.
7. A display panel comprising the display substrate of claim 6.
8. A display device characterized by comprising the display panel according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192041.0U CN203773913U (en) | 2014-04-18 | 2014-04-18 | Pixel unit drive circuit, display substrate, display panel, and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192041.0U CN203773913U (en) | 2014-04-18 | 2014-04-18 | Pixel unit drive circuit, display substrate, display panel, and display device |
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| Publication Number | Publication Date |
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| CN203773913U true CN203773913U (en) | 2014-08-13 |
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| CN201420192041.0U Expired - Fee Related CN203773913U (en) | 2014-04-18 | 2014-04-18 | Pixel unit drive circuit, display substrate, display panel, and display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971634A (en) * | 2014-04-18 | 2014-08-06 | 京东方科技集团股份有限公司 | Pixel unit driving circuit, display substrate, display panel and display device |
| WO2016078314A1 (en) * | 2014-11-19 | 2016-05-26 | 京东方科技集团股份有限公司 | Drive power supply, display drive circuit, and organic light emitting diode |
| CN111292676A (en) * | 2018-11-20 | 2020-06-16 | 群创光电股份有限公司 | electronic device |
-
2014
- 2014-04-18 CN CN201420192041.0U patent/CN203773913U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971634A (en) * | 2014-04-18 | 2014-08-06 | 京东方科技集团股份有限公司 | Pixel unit driving circuit, display substrate, display panel and display device |
| US9613569B2 (en) | 2014-04-18 | 2017-04-04 | Boe Technology Group Co., Ltd. | Pixel unit driving circuit, display substrate, display panel and display device |
| WO2016078314A1 (en) * | 2014-11-19 | 2016-05-26 | 京东方科技集团股份有限公司 | Drive power supply, display drive circuit, and organic light emitting diode |
| US10283050B2 (en) | 2014-11-19 | 2019-05-07 | Boe Technology Group Co., Ltd. | Driving power supply, display driving circuit and organic light emitting diode display |
| CN111292676A (en) * | 2018-11-20 | 2020-06-16 | 群创光电股份有限公司 | electronic device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |