CN100377387C - Electronic device with organic electroluminescent display - Google Patents

Abstract

An electronic device with an organic electroluminescent display comprises a DC voltage converter, an organic electroluminescent display and at least one execution unit. The DC voltage converter is used to convert a first DC voltage into a second DC voltage. The organic electroluminescent display is used to receive the first DC voltage. The execution unit is used to receive the second DC voltage to execute the system function of the electronic device.

Description

Electronic device with organic electroluminescent display

technical field

The present invention relates to an electronic device with a display, and in particular to an electronic device with an organic electroluminescence display.

Background technique

Organic Electro-Luminescence Display (OELD), the biggest feature is that it is a self-luminous body, so it does not need backlight (Backlight) and color filter (Color Filter) and other structures, so it can compare with liquid crystal display (Liquid Crystal Display, LCD) is thinner. In addition, the advantages of wider viewing angle, fast response speed, low driving voltage, higher color and contrast than LCD, lower power consumption, and simpler manufacturing process make organic electroluminescent displays the most promising after liquid crystal displays. display technology.

FIG. 1A shows a block diagram of a conventional electronic device with an Organic Electro-Luminescence Display (OELD). The electronic device 10 includes a DC voltage converter (DC to DC converter) 120, a display DC voltage converter 130, an organic electroluminescent display 170, and at least one execution unit (the first execution unit 140, the second execution unit in FIG. 1A 150 and the third execution unit 160 are described as examples). The electronic device 10 is supplied with a first DC voltage by an external power supply 110 to meet its power requirements. The DC voltage converter 120 is used to convert the first DC voltage into a second DC voltage, and use the second DC voltage as the working power of the first execution unit 140 , the second execution unit 150 and the third execution unit 160 . The first execution unit 140 , the second execution unit 150 and the third execution unit 160 receive the second DC voltage output from the DC voltage converter 120 to execute system functions of the electronic device 10 . The display DC voltage converter 130 is used to convert the first DC voltage into a third DC voltage. The organic electroluminescent display 170 receives the third DC voltage to perform a display function.

FIG. 1B shows a block diagram of another conventional electronic device with an organic electroluminescence display. The difference between the electronic device 20 and the aforementioned electronic device 10 is that the display DC voltage converter 130 does not directly receive the first DC voltage output by the external power supply 110, but converts the first DC voltage into a second DC voltage by means of the DC voltage converter 120. DC voltage, the display DC voltage converter 130 converts the second DC voltage into a third DC voltage and outputs it to the organic electroluminescent display 170 to perform a display function.

However, the use of the display DC voltage converter 130 is not only costly, but also occupies a relatively small space in the electronic device, making the available space smaller, increasing the difficulty of wiring the printed circuit board, and easily causing electromagnetic interference (EMI). Electro Magnetic Interference, EMI). Not only that, the conversion of the power supply will also cause the attenuation of the power energy efficiency, resulting in the increase of power consumption.

Contents of the invention

In view of this, the purpose of the present invention is to provide an electronic device with an organic electroluminescent display, by improving the manufacturing process and design, or changing the driving voltage, so as to achieve the purpose of reducing the number of DC voltage converters.

According to the object of the present invention, an electronic device with an organic electroluminescent display is proposed, including a DC voltage converter, an organic electroluminescent display, and an execution unit. The DC voltage converter is used for converting the first DC voltage into a second DC voltage. The execution unit is used for receiving the second DC voltage to execute the system function of the electronic device. The organic electroluminescence display is used for receiving the first direct current voltage.

According to the second object of the present invention, an electronic device with an organic electroluminescent display is proposed, comprising a DC voltage converter, an organic electroluminescent display, and an execution unit. The DC voltage converter is used for converting the first DC voltage into a second DC voltage. The organic electroluminescence display is used for receiving the second direct current voltage. The execution unit is used for receiving the second DC voltage to execute the system function of the electronic device.

According to the third object of the present invention, an electronic device with an organic electroluminescent display is proposed, including a DC voltage converter, an organic electroluminescent display, and an execution unit. The DC voltage converter is used for converting the first DC voltage into a second DC voltage. The execution unit is used for receiving the second DC voltage to execute the system function of the electronic device. The passive component voltage conversion unit is used for converting the first DC voltage into a third DC voltage. The organic electroluminescence display is used for receiving the third direct current voltage.

According to a fourth object of the present invention, an electronic device with an organic electroluminescent display is proposed, including a DC voltage converter, an organic electroluminescent display, and an execution unit. The DC voltage converter is used for converting the first DC voltage into a second DC voltage. The execution unit is used for receiving the second DC voltage to execute the system function of the electronic device. The passive component voltage conversion unit is used for converting the second DC voltage into a third DC voltage. The organic electroluminescence display is used for receiving the third direct current voltage.

In order to make the above-mentioned purpose, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below, and is described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1A shows a block diagram of a conventional electronic device with an organic electroluminescence display.

FIG. 1B shows a block diagram of another conventional electronic device with an organic electroluminescent display.

FIG. 2 shows a block diagram of an electronic device with an organic electroluminescent display according to a first embodiment of the present invention.

FIG. 3 shows a block diagram of an electronic device with an organic electroluminescent display according to a second embodiment of the present invention.

FIG. 4 shows a block diagram of an electronic device with an organic electroluminescent display according to a third embodiment of the present invention.

FIG. 5 shows a block diagram of an electronic device with an organic electroluminescence display according to a fourth embodiment of the present invention.

FIG. 6A shows a schematic diagram of an organic electroluminescent display used in accordance with a preferred embodiment of the present invention.

FIG. 6B shows a schematic diagram of a first pixel with an organic electroluminescent display according to a preferred embodiment of the present invention.

FIG. 6C shows a schematic diagram of a second pixel with an OLED display according to a preferred embodiment of the present invention.

Description of reference symbols

10, 20: Conventional electronic devices with organic electroluminescent displays

30, 40, 50, 60: Electronic devices with organic electroluminescent displays according to the invention

110, 210: external power supply

120, 220: DC voltage converter

130: Display DC voltage converter

430, 530: passive component voltage conversion unit

140, 240: first electronic device

150, 250: Second electronic device

160, 260: the third electronic device

170, 270, 370, 470, 570: organic electroluminescent displays

271: Data Driver

272: pixels

276: Transistor

276(1): P-type transistor

276(2): N-type transistor

277: Organic Light Emitting Diodes

Detailed ways

Embodiment one

Please refer to FIG. 2 , which shows a block diagram of an electronic device with an organic electroluminescence display according to a first embodiment of the present invention. An electronic device 30 with an organic electroluminescence display, for example, the electronic device 30 can be a digital camera or a mobile phone. The electronic device 30 includes a DC voltage converter 220 , at least one execution unit (this embodiment takes the first execution unit 240 , the second execution unit 250 and the third execution unit 260 as examples) and an organic electroluminescence display 270 . The electronic device 30 is supplied with a first DC voltage by an external power source 210 for its power requirements. The external power source 210 is, for example, a lithium battery in a digital camera or a mobile phone. The organic electroluminescent display 270 is used to receive the first DC voltage to perform the display function. The organic electroluminescent display 270 can be, for example, a polymer light-emitting diode display (Polymer Light-Emitting Diode Display, PLED) or an organic light-emitting diode display ( Organic Light-Emitting Diode Display, OLED). The DC voltage converter 220 is used for converting the first DC voltage into a second DC voltage. The first execution unit 240 , the second execution unit 250 and the third execution unit 260 are configured to receive the second DC voltage to execute system functions of the electronic device 30 . The execution unit in the digital camera can be, for example, a flash drive circuit, an image capture circuit or a lens switch drive circuit, which is used to execute the flash action of the flash, the image capture action, or the action of controlling the lens switch according to its functional purpose.

Embodiment two

Please refer to FIG. 3 , which shows a block diagram of an electronic device with an organic electroluminescent display according to a second embodiment of the present invention. The difference between the electronic device 40 and the aforementioned electronic device 30 is that the organic electroluminescent display 370 does not directly receive the first DC voltage output by the external power supply 210, but first converts the first DC voltage to the first DC voltage by the DC voltage converter 320. Second DC voltage, the organic electroluminescent display 370 receives the second DC voltage output from the DC voltage converter 320 to perform its display function.

Embodiment three

Please refer to FIG. 4 , which shows a block diagram of an electronic device with an organic electroluminescent display according to a third embodiment of the present invention. The difference between the electronic device 50 and the aforementioned electronic device 30 is that the electronic device 50 adds a passive component voltage conversion unit 430 between the external power source 210 and the organic electroluminescence display 470 . The organic electroluminescent display 470 receives the third DC voltage output by the passive component voltage conversion unit 430 to perform its display function by first converting the first DC voltage to the third DC voltage by the passive component voltage conversion unit 430 .

Wherein, the passive component voltage conversion unit 430 is different from the DC voltage converter in that the passive component voltage conversion unit 430 is only composed of passive components, such as diodes. By using the voltage drop characteristic of the diode itself, the first DC voltage is reduced and the third DC voltage is output. Compared with the display DC voltage converter 130 , the passive components are not only small in size and low in power consumption, but also their cost price is much lower than that of the display voltage converter 130 .

Embodiment Four

Please refer to FIG. 5 , which shows a block diagram of an electronic device with an organic electroluminescent display according to a fourth embodiment of the present invention. The difference between the electronic device 60 and the aforementioned electronic device 40 is that the electronic device 60 adds a passive component voltage conversion unit 530 between the DC voltage converter 220 and the organic electroluminescence display 570 . The passive component voltage conversion unit 530 first converts the second DC voltage output by the DC voltage converter 220 into a third DC voltage, and then the organic electroluminescence display 570 receives the third DC voltage output by the passive component voltage conversion unit 530 to execute its display function.

The operating power of the organic electroluminescence display of the electronic device in the above four embodiments can be provided by the DC voltage converter 220 or the external power supply 210 , without using the display DC voltage converter 130 . The method of omitting the display DC voltage converter 130 will be further described below with respect to the electronic device 30 , the electronic device 40 , the electronic device 50 and the electronic device 60 .

Please refer to FIG. 6A , FIG. 6B and FIG. 6C at the same time. FIG. 6A shows a schematic diagram of an organic electroluminescence display used according to a preferred embodiment of the present invention. FIG. 6B shows a schematic diagram of a first pixel with an organic electroluminescent display according to a preferred embodiment of the present invention. FIG. 6C shows a schematic diagram of a second pixel with an OLED display according to a preferred embodiment of the present invention. The organic electroluminescence display 270 includes a data driver 271 and a plurality of pixels 272 . The data driver 270 is used to output the pixel voltage Vdata. Each pixel 272 includes an OLED 277 and a transistor 276, and the transistor 276 can be a P-type transistor 276(1) or an N-type transistor 276(2).

When the transistor 276 in the pixel 272 is to use the P-type transistor 276(1), the negative terminal N of the organic light-emitting diode 277 is coupled to a low voltage Vss, and the low voltage Vss can be a negative voltage. The source S of the P-type transistor 276(1) receives a DC voltage Vdd, the DC voltage Vdd is the first DC voltage in the electronic device 30, and the second DC voltage in the electronic device 40, and in the electronic device 50 and the electronic device 60 is the third DC voltage, the gate G of the P-type transistor 276 ( 1 ) receives the pixel voltage Vdata, and the drain D of the P-type transistor 276 ( 1 ) is electrically connected to the positive terminal P of the organic electroluminescent diode 277 .

Please refer to FIG. 6C, when the transistor 276 in the pixel 272 is changed to an N-type transistor 276(2), the positive terminal P of the organic electroluminescent diode 277 is coupled to a DC voltage Vee, and the N-type transistor 276(2) The drain D is electrically connected to the negative terminal N of the organic electroluminescent diode 277, the gate of the N-type transistor 276(2) receives the pixel voltage Vdata, and the source S of the N-type transistor 276(2) is coupled to the DC voltage Vdd. Wherein, regardless of whether the transistor 276 uses the P-type transistor 276(1) or the N-type transistor 276(2), the driving current flowing through the OLED 277 is substantially the same as the driving current flowing through the transistor 276 .

The driving current I flowing through the organic light emitting diode 277 determines the brightness performance of the organic light emitting display 270, so when the driving current I reaches the rated current, the organic light emitting diode 277 produces a rated brightness, and the rated current corresponds to a rated pixel voltage, When the first DC voltage provided by the external power supply 210 changes, in this embodiment, by changing the channel width-to-length ratio of the transistor 276, the gate G of the transistor 276 generates substantially the same current as the rated current when receiving the rated pixel voltage. . Therefore, when the organic electroluminescent diode 277 is applied to the organic electroluminescent display 270 shown in FIGS. The channel width-to-length ratio of the organic electroluminescent diode 277 can make the organic electroluminescent display 270 produce the desired rated brightness. In this way, the organic electroluminescence display 270 can display required brightness without using the display DC voltage converter 130 shown in FIG. 1A or FIG. 1B .

In addition, the driving method of the organic light emitting diode 277 can also be changed to achieve the purpose of omitting the DC voltage converter of the display in the present invention. Since the magnitude of the driving current I depends on the gate-source terminal voltage of the transistor 276, when the value of Vdd received by the source S changes, the voltage value of the gate G can be correspondingly changed, that is, the pixel voltage Vdata to obtain the same magnitude of the driving current I, so that the organic electroluminescent diode 277 produces the same brightness. Assume that when the gate-source terminal voltage of the transistor 276 reaches the first potential difference, the driving current I generated by the transistor 276 makes the brightness of the OLED 277 maximize. When the gate-source terminal voltage reaches the second potential difference, the driving current I generated by the transistor 276 makes the brightness of the organic light emitting diode 277 the minimum. Therefore, in this embodiment, when the DC voltage Vdd at the source terminal S of the transistor 276 changes, the data driver 271 controls the pixel voltage Vdata according to the variation of the DC voltage Vdd, so that the pixel voltage Vdata produces substantially the same variation. At the same time, the first potential difference and the second potential difference are substantially maintained. Therefore, when the organic electroluminescent diode 277 is applied to the organic electroluminescent display 270 shown in FIGS. The value of the pixel voltage Vdata received by the organic electroluminescent diode 277 can make the organic electroluminescent display 270 produce desired brightness. In this way, the purpose of saving the DC voltage converter of the display can be achieved.

In the electronic device with the organic electroluminescent display disclosed in the above embodiments of the present invention, even if different external power sources are used, the organic electroluminescent display still has the same brightness performance.

A second advantage of the invention is reduced power consumption. The electronic device of this embodiment does not need to use a group of display DC voltage converters alone, so it can reduce the energy loss caused by the display DC voltage converter during DC level conversion, especially when the electronic device is a digital camera or a mobile phone, because The external power supply is usually a lithium battery, and the use time of the lithium battery in the electronic device can be relatively increased by reducing the power consumption mentioned above.

A third advantage of the invention is space saving. In a traditional electronic device, the display DC voltage converter occupies about 40% of the space in the electronic device. This reduces the relatively available space in the electronic device, causing the rest of the electronic components to be placed too close to each other, which is prone to electromagnetic interference. In order to avoid the generation of electromagnetic interference effects, additional shielding devices (such as iron covers) are often required. Due to the feature of the above embodiment that no display DC voltage converter is required, the use space of the original electronic device can be increased, and the problem of electromagnetic interference can be further solved.

A fourth advantage of the present invention is the reduction of production costs. A set of monitor DC voltage converters is more expensive. Due to the fact that this example does not need to use the DC voltage converter of the display, the production cost can be reduced and the market competitiveness can be increased.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention, and those skilled in the art can make various modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims of the present application.

Claims (9)

1. electronic installation comprises:

One direct current electric pressure converter is in order to be converted to one second direct voltage with one first direct voltage;

At least one performance element is in order to receive this second direct voltage, to carry out the systemic-function of this electronic installation;

One passive component voltage conversion unit is in order to be converted to one the 3rd direct voltage with this first direct voltage or this second direct voltage; And

One display of organic electroluminescence is in order to receive the 3rd direct voltage.

2. electronic installation as claimed in claim 1, wherein this first direct voltage system is provided by an external power source.

3. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence is a macromolecule organic light emitting diode display.

4. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence is an organic light emitting diode display.

5. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence comprises a data driver and a plurality of pixel, and this data driver is in order to export a pixel voltage, and respectively this pixel comprises:

One organic electroluminescent LED, a negative terminal of this organic electroluminescent LED is coupled to a low-voltage; And

One P transistor npn npn, the one source pole of this P transistor npn npn receives the 3rd direct voltage, one grid of this P transistor npn npn receives this pixel voltage, one drain electrode of this P transistor npn npn electrically connects with an anode of this organic electroluminescent LED, at least have one first potential difference and one second potential difference between this source electrode of this P transistor npn npn and this grid, wherein this first potential difference results from this organic electroluminescent LED brightness when maximum, and this second potential difference results from this organic electroluminescent LED brightness hour;

Wherein, when the 3rd direct voltage changes, this data driver is controlled this pixel voltage according to the variable quantity of the 3rd direct voltage that changes, so that this pixel voltage produces identical in fact variable quantity, so that this first potential difference and this second potential difference are kept fixing in fact.

6. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence comprises a plurality of pixels, respectively this pixel comprises:

One organic electroluminescent LED, an end of this organic electroluminescent LED is coupled to a negative voltage, and when a rated current was flowed through this organic electroluminescent LED, this organic electroluminescent LED produced a nominal brightness; And

One P transistor npn npn comprises:

One source pole receives the 3rd direct voltage;

One drain electrode is with the anode electric connection of this organic electroluminescent LED; And

One grid receives a pixel voltage, and this rated current corresponds to a specified pixel voltage;

Wherein, it is consistent with the electric current that flows through this P transistor npn npn in fact to flow through the electric current of this organic electroluminescent LED;

Wherein, when the 3rd direct voltage changes,, make this grid of this P transistor npn npn when receiving this specified pixel voltage, produce the electric current identical in fact with this rated current by the channel width length ratio that changes this P transistor npn npn.

7. electronic installation as claimed in claim 1, wherein this passive component voltage conversion unit is a passive component.

8. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence comprises a data driver and a plurality of pixel, and this data driver is in order to export a pixel voltage, and respectively this pixel comprises:

One organic electroluminescent LED, an anode of this organic electroluminescent LED is coupled to a high voltage; And

One N transistor npn npn, one drain electrode of this N transistor npn npn electrically connects with a negative terminal of this organic electroluminescent LED, one grid of this N transistor npn npn receives this pixel voltage, the one source pole of this N transistor npn npn is coupled to the 3rd direct voltage, has one first potential difference and one second potential difference between this transistorized this source electrode and this grid at least;

Wherein, this first potential difference results from this organic electroluminescent LED brightness when maximum, and this second potential difference results from this organic electroluminescent LED brightness hour;

Wherein, when the 3rd direct voltage changes, this data driver is controlled this pixel voltage according to the variable quantity of the 3rd direct voltage, so that this pixel voltage produces identical in fact variable quantity, so that this first potential difference and this second potential difference are kept fixing in fact.

9. electronic installation as claimed in claim 1, wherein this display of organic electroluminescence comprises a plurality of pixels, respectively this pixel comprises:

One organic electroluminescent LED, an end of this organic electroluminescent LED is coupled to a high voltage, and when a rated current was flowed through this organic electroluminescent LED, this organic electroluminescent LED produced a nominal brightness; And

One N transistor npn npn comprises:

One source pole is coupled to the 3rd direct voltage;

One drain electrode is with the negative terminal electric connection of this organic electroluminescent LED; And

One grid receives a pixel voltage, and this rated current system corresponds to a specified pixel voltage;

Wherein, it is consistent with the electric current that flows through this N transistor npn npn in fact to flow through the electric current of this organic electroluminescent LED;

Wherein, when this first direct voltage changes,, make this grid of this N transistor npn npn when receiving this specified pixel voltage, produce the electric current identical in fact with this rated current by the channel width length ratio that changes this N transistor npn npn.

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