CN100495485C - Organic Light Emitting Diode Display - Google Patents

Abstract

An organic light emitting diode display includes an organic light emitting diode display panel and a driving circuit. The organic light emitting diode display panel at least has a first pixel array and a second pixel array. The first pixel array has a plurality of first pixels, and the second pixel has a plurality of second pixels. Wherein, the two pixel arrays have different resolutions. The driving circuit is used for driving the first pixel array and the second pixel array to display images and providing a first voltage and a second voltage.

Description

Organic Light Emitting Diode Display

technical field

The invention relates to an organic light emitting diode display, in particular to an organic light emitting diode display panel.

Background technique

Organic light-emitting diode displays have the advantages of fast response speed, light and thin size, and can provide high-quality images. Recently, they have gradually grown rapidly in the display market and are used in mobile phone panels, digital cameras, personal digital assistants (PDAs) and car navigation systems. The market that intends to replace liquid crystal displays (LCDs).

Currently, in the design of the mobile phone panel or other information panels, two types of images are often displayed, namely, the mobile phone status information image and the wallpaper image. Please refer to FIG. 1 , which is a schematic diagram of a display panel of a mobile phone. The display panel 102 of the mobile phone is divided into a text display area A and a screen display area B. The text display area A provides mobile phone status information images, such as signal strength 10, mobile phone status 20 (silent/audible mode), SMS reminder 30, battery status 40, system operator 50, and so on. The image display area B is used to display the wallpaper image 60 and the user interface and so on. Since the information displayed in the screen display area B can change frequently, such as changing the wallpaper image or switching to a user interface, the image displayed in the text display area A is almost fixed compared to the image display area B. Therefore, in this case, after the display panel 102 of the mobile phone is used for a period of time, it is possible to observe the burn-in phenomenon of the OLED pixels on the text display area A, because the brightness of the OLED pixels in the normal display area will decay as the light-emitting time increases. Deterioration, under the same driving voltage, the brightness of this constant display area will be darker than other areas, so there will be images printed into the panel (Image Sticking).

After a general mobile phone has been used for a period of time, the user will find some black spots on the panel of the mobile phone, which is the so-called burn-in. Burn-in is especially prone to occur in frequently displayed areas, causing users to be unable to clearly read the information on the panel, which is quite inconvenient.

Contents of the invention

In view of this, an object of the present invention is to provide an OLED display, which can reduce the burn-in phenomenon of OLEDs that often display fixed images and has better energy efficiency.

According to the object of the present invention, an organic light emitting diode display is provided, which includes an organic light emitting diode display panel and a driving circuit. The OLED display panel includes a first pixel array and a second pixel array. The first pixel array has a plurality of first pixels, and the second pixel array has a plurality of second pixels. Wherein, the two pixel arrays have different resolutions. The driving circuit is used to drive the first pixel array and the second pixel array to display images, and provide the first voltage and the second 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

Figure 1 shows a schematic diagram of a mobile phone panel.

FIG. 2 shows a schematic diagram of an OLED display according to a preferred embodiment of the present invention.

FIG. 3 shows a schematic diagram of an OLED display according to another preferred embodiment of the present invention.

Description of reference symbols

10: Signal Strength

20: Phone status (sound/silent mode)

30: SMS reminder

40: battery status

50: System operator

60: Tablecloth Image

102: Mobile phone display panel

200, 300: OLED display

202, 302: OLED display panel

204, 304: drive circuit

206: Data drive circuit

208: Scan driving circuit

306: first data drive circuit

308: Second data driving circuit

310: first scanning driving circuit

312: The second scanning driving circuit

M1: first pixel array

M2: second pixel array

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of an OLED display according to a preferred embodiment of the present invention. The OLED display 200 is suitable for a portable electronic device, such as a display screen of a mobile phone, and includes an OLED display panel 202 . The OLED display panel 202 has at least two pixel arrays with different resolutions, such as a first pixel array M1 and a second pixel array M2. The first pixel array M1 has a plurality of first pixels P1, and the unit area of the first pixel array M1 has Y first pixels P1, and Y is a positive integer. The second pixel array M2 has a plurality of second pixels P2, and the second pixel array M2 has Z second pixels P2 per unit area, Z is a positive integer and Z is greater than Y. For example, as shown in FIG. 2, in the first pixel array M1, there is one first pixel P1 in the unit area X1, and in the second pixel array M2, the unit area X2 having the same area as the unit area X1 has four pixel P1 in it. Two-pixel P2. Therefore, based on the above configuration relationship, the effective light-emitting area of the organic light-emitting diode OLED of the first pixel P1 can be larger than the effective light-emitting area of the organic light-emitting diode OLED of the second pixel P2 in design.

Since the effective light-emitting area of the organic light-emitting diode OLED of the first pixel P1 is larger than the effective light-emitting area of the organic light-emitting diode OLED of the second pixel P2, the current density of the organic light-emitting diode OLED of the first pixel P1 will be low when it is turned on. The current density when the organic light emitting diode OLED of the second pixel P2 is turned on. However, the current density of the OLED when it is turned on is inversely proportional to its deterioration degree, that is, the OLED with a lower current density when it is turned on has a slower aging degree. See related narrative in Nikkei BP, 2004 Flat Panel Displays, Nikkei BP in Japan, p.217. Therefore, when the organic light emitting diode OLED in the first pixel array M1 displays a fixed image for a long time, its degradation degree can be greatly reduced. In other words, the present invention uses the first pixel array M1 with fewer pixels per unit area on the same display panel 202 to display mobile phone status information, such as signal strength, mobile phone status (silent/audible mode), SMS notification, Compared with the first pixel array M1, the second pixel array M2, which has more pixels per unit area, is used to display images, such as mobile phone desktop or mobile phone wallpaper. In this way, when the first pixel array M1 displays a fixed image for a long time, the degree of degradation or burn-in of the organic light emitting diodes OLED will be greatly reduced.

In addition, as shown in FIG. 2 , the OLED panel 202 further includes a plurality of data lines 205 and a plurality of scanning material lines 207 . The data line 205 is coupled to the second pixel P2, and part of the data line 205 is coupled to the first pixel P1. The scanning material line 207 is coupled to the first pixel P1 and the second pixel P2. As shown in FIG. 2, the data lines 205 are respectively 205(1), 205(2), 205(3)...205(10), wherein the first pixel array M1 and the second pixel array M2 share these data lines 205(1), 205(3)...205(9), and the remaining data lines 205(2), 205(4)...205(10) are only used by the second pixel array M2.

The OLED display 200 further includes a driving circuit 204 for driving the first pixel array M1 and the second pixel array M2 to display images, and providing a first voltage and a second voltage to the two pixel arrays. The driving circuit 204 further includes a data driving circuit 206 and a scanning driving circuit 208 . The data driving circuit 206 is coupled to the data line 205 and outputs the pixel voltage to the first pixel P1 and the second pixel P2 through the data line 205 . The scan driving circuit 208 is coupled to the scan line 207 and outputs a scan signal to the first pixel P1 and the second pixel P2 through the scan line. In addition, the first voltage and the second voltage provided by the driving circuit 204 serve as driving power for the first pixel array M1 and the second pixel array M2 respectively. Therefore, the driving circuit 204 can provide independent driving power for the two pixel arrays M1 and M2 of the display panel 202 . In this way, according to the needs of the user, the power supply of the area that does not need to display images on the mobile phone can be cut off, so as to optimize the energy usage efficiency of the mobile phone. In other words, the present invention divides the display panel 202 into two pixel arrays M1 and M2, the first pixel array M1 provides mobile phone status information, and the second pixel array M2 provides user personalized settings. When the user wants to obtain mobile phone status information, such as signal strength, SMS notification, etc., the driving circuit 204 only provides driving power to the first pixel array M1, and when the user wants to change the personalized settings, the driving circuit 204 only provides driving power to the The two-pixel array M2 provides driving power. In this way, according to the operation requirements of the user, the power supply of the area of the mobile phone that does not need to display images is cut off, so as to achieve the purpose of saving the power supply of the mobile phone.

In the above-mentioned embodiment, the OLED display panel 200 has a first pixel array M1 and a second pixel array M2 with different pixel densities, and the two pixel arrays M1 and M2 share the data driving circuit 206 and the scanning driving circuit 208. If desired To independently display the two pixel arrays, it is necessary to consider the signal control of the data driving circuit 206 and the scanning driving circuit 208, especially the number of data lines 205 of the two pixel arrays is different, and the control of the output signal by the data driving circuit 206 is more complicated. In order to control two different pixel arrays more efficiently, the present invention will be further described with preferred embodiments below.

Please refer to FIG. 3 , which is a schematic diagram of an organic light emitting display according to another preferred embodiment of the present invention. The OLED display 300 includes a display panel 302 and a driving circuit 304 . The OLED display panel 302 includes a first pixel array M1 and a second pixel array M2. The panel of the organic light emitting display 300 further includes a plurality of first data lines 305 and a plurality of second data lines 307 , a plurality of first scan lines 309 and a plurality of second scan lines 311 . The first data line 305 is coupled to the first pixel P1, and the second data line 307 is coupled to the second pixel P2. The first scanning material line 309 is coupled to the first pixel P1, and the second scanning material line 311 is coupled to the second pixel P2. The driving circuit 304 further includes a first data driving circuit 306 , a second data driving circuit 308 , a first scanning driving circuit 310 , and a second scanning driving circuit 312 . The first data driving circuit 306 is coupled to the first data line 305 and outputs the pixel voltage to the first pixel P1 through the first data line 305 . The second data driving circuit 308 is coupled to the second data line 307 and outputs the pixel voltage to the second pixel P2 through the second data line 307 . The first scan driving circuit 310 is coupled to the first scan line 309 and outputs a scan signal to the first pixel P1 through the first scan line 309 . The second scan driving circuit 312 is coupled to the second scan line 311 and outputs a scan signal to the second pixel P2 through the second scan line 311 .

The organic light emitting diode display panel 300 is substantially the same as the panel driving method of the previous embodiment, and is characterized in that two independent data driving circuits 306 and 308 and scanning driving circuits 310 and 312 are used to control the first pixel array M1 and the second pixel array M1 respectively. The two pixel arrays M2, whereby one of the pixel arrays can be changed independently, or the two arrays can be changed simultaneously, so that the information of different pixel arrays can be changed more efficiently and easily.

In the above-mentioned embodiment, the ratio of the number of pixels per unit area of the first pixel array M1 to the second pixel array M2 is described as 1:4. Design requirements, such as 1:2, 1:8, 2:3, 3:7 and other different ratios to design, but there are different changes. The arrangement of the first pixel array M1 and the second pixel array M2 on the display panel can also be arranged in any way, for example, the left-right arrangement, the inner-outer arrangement or the mixed arrangement can be changed, and the arrangement is not limited to the up-and-down arrangement. , and is not limited to the fact that the first pixel array M1 is located above the panel and the second pixel array M2 is located below the panel.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art can make various changes without departing from the spirit and scope of the present invention. Changes and modifications, so the scope of protection of the present invention shall be based on the claims of the present invention.

Claims (10)

1. An organic light emitting diode display, comprising: An organic light emitting diode display panel, comprising: A first pixel array having a plurality of first pixels, the first pixels all receive a first voltage, the first pixel array has N first pixels in a unit area, and N is a positive integer; and A second pixel array having a plurality of second pixels, the second pixels all receive a second voltage, the second pixel array has M second pixels in a unit area, M is a positive integer, and M is greater than N; as well as A driving circuit is used for driving the first pixel array and the second pixel array and providing the first voltage and the second voltage. 2. The organic light emitting diode display as claimed in claim 1, wherein the organic light emitting diode display panel further comprises: a plurality of data lines, respectively coupled to the second pixels, and some of the data lines are respectively coupled to the first pixels; and A plurality of scan lines coupled to the first pixel and the second pixel. 3. The organic light emitting diode display as claimed in claim 2, wherein the driving circuit can control the first voltage and the second voltage respectively, the driving circuit further comprising: a data driving circuit, coupled to the data line and outputting a pixel voltage to the first pixel and the second pixel through the data line; and A scan driving circuit is coupled to the scan line and outputs a scan signal to the first pixel and the second pixel through the scan line. 4. The OLED display as claimed in claim 3, wherein the OLED display is used in a portable electronic device. 5. The organic light emitting diode display as claimed in claim 4, wherein the portable electronic device is a mobile phone, the organic light emitting diode display panel is a display screen of the mobile phone, and the first pixel array is used to display the mobile phone A mobile phone status information, the second pixel array is used to display an operation image of the mobile phone. 6. The organic light emitting diode display as claimed in claim 5, wherein the mobile phone status information includes reception strength, battery level, time, SMS reminder and network name, and the operation image includes a user interface and a desktop image. 7. The organic light emitting diode display according to claim 1, wherein the organic light emitting diode display panel further comprises: a plurality of first data lines, coupled to the first pixel; a plurality of second data lines coupled to the second pixels; a plurality of first scan lines coupled to the first pixels; and A plurality of second scan lines coupled to the second pixels. 8. The organic light emitting diode display as claimed in claim 7, wherein the driving circuit can control the first voltage and the second voltage respectively, and the driving circuit further comprises: A first data driving circuit, coupled to the first data line and outputting a pixel voltage to the first pixel through the first data line; A first scanning driving circuit, coupled to the first scanning line and outputting a scanning signal to the first pixel through the first scanning line; a second data driving circuit, coupled to the second data line and outputting a pixel voltage to the second pixel through the second data line; and A second scan driving circuit is coupled to the second scan line and outputs a scan signal to the second pixel through the second scan line. 9. The OLED display as claimed in claim 8, wherein the OLED display is used in a portable electronic device. 10. The organic light emitting diode display as claimed in claim 9, wherein the portable electronic device is a mobile phone, the organic light emitting diode display panel is a display screen of the mobile phone, and the first pixel array is used to display the mobile phone A mobile phone status information, the second pixel array is used to display an operation image of the mobile phone.

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