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OLED display panel and its driving method

A technology of a display panel and a driving method, applied in static indicators, instruments, semiconductor devices, etc., can solve the problems of display brightness difference, OLED pixel luminous brightness, and OLED pixel current density, etc., to achieve the same luminous brightness and reduce voltage The effect of reducing and reducing loss

Active Publication Date: 2017-10-03
SHANGHAI TIANMA MICRO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the thickness of the cathode 5 of the OLED pixel is relatively thin, there is a large voltage drop in the process of transmitting the cathode voltage from the peripheral area of ​​the display screen to the middle area, which in turn causes the display brightness of the middle area and the peripheral area of ​​the OLED display screen to be relatively large. difference
The rationale behind this phenomenon is that, as image 3 As shown, due to the difference in the cathode voltage of OLED pixels in different regions caused by the voltage division of the lateral resistance R of the cathode, the voltage across the light-emitting layer of OLED pixels in different regions is different, so that the current density flowing through OLED pixels in different regions Different, resulting in different luminance of OLED pixels

Method used

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  • OLED display panel and its driving method
  • OLED display panel and its driving method
  • OLED display panel and its driving method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The invention provides an OLED display panel, such as Figure 4 As shown, it includes: a substrate 101, a TFT array on the substrate 101, an anode metal 103 electrically connected to the source or drain of the TFT, a light emitting layer 104 on the anode metal 103, and a light emitting layer on the light emitting layer 104. The cathode 105 , the cathode 105 and the anode metal 103 jointly drive the light emitting layer 104 .

[0047]The OLED display panel further includes a first electrode 106 that is in the same layer as the anode metal 103 and is electrically insulated. The first electrode 106 is electrically connected to the cathode 105 for transmitting cathode voltage.

[0048] To clarify, Figure 4 Only one OLED pixel is shown in the figure, and it should be understood by those skilled in the art that this should not be taken as a limitation of the present invention. In the present invention, the cathode voltage required by each OLED pixel is transmitted to the O...

Embodiment 2

[0062] read on Figure 4 , this embodiment provides a further specific structure of the OLED display panel on the basis of the first embodiment. The difference from Embodiment 1 is that the insulating layer 102 of the OLED display panel in this embodiment further includes a third via hole 1023, and the OLED display panel also includes a second electrode located on the same layer as the second metal layer. 108 , the first electrode 106 is electrically connected to the second electrode 108 through the third via hole 1023 .

[0063] Preferably, the equivalent resistance for transmitting the cathode signal through the second electrode 108 is lower than the equivalent resistance for transmitting the cathode voltage signal through the cathode 105 . Through such a structure, the cathode voltage signal can be added to the second electrode 108 located on the second metal layer, and the second electrode 108 transmits the cathode voltage signal to the first electrode 106 through the fir...

Embodiment 3

[0066] This embodiment further improves the present invention on the basis of the second embodiment. The difference between this embodiment and the second embodiment is that the OLED display panel only includes the first electrode 106 which is in the same layer as the anode metal 103 and electrically insulated, and the first electrode 106 is electrically connected to the cathode 105 for transmitting the cathode voltage. Preferably, the first electrode 106 is electrically connected to the cathode 105 through the second via hole 1022, and the cathode voltage signal is directly applied to the first electrode 106, and transmitted to the cathode of each OLED pixel through the first electrode 106, such as Figure 5 shown. Further, the first electrode 106 has a protection layer 109 , and the protection layer 109 covers part of the first electrode 106 and exposes the cathode 105 electrically connected to the first electrode 106 . Preferably, the protective layer 109 is a transparent ...

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Abstract

The invention provides an OLED display panel and a driving method thereof. Wherein, the OLED display panel includes a substrate; a TFT array located on the substrate; an anode metal electrically connected to the source or drain of the TFT; a light emitting layer located on the anode metal; The cathode on the layer, the cathode and the anode metal jointly drive the light-emitting layer; the OLED display panel also includes a first electrode on the same layer as the anode metal and electrically insulated, and the first electrode is electrically connected The cathode is used for transmitting cathode voltage. The invention also provides a corresponding driving method. The structure and method reduce the loss of the cathode voltage signal during the transmission process, avoid the difference in voltage across the two ends of the light-emitting layer of the OLED pixel in different regions, and make the luminance of the entire OLED display panel the same.

Description

technical field [0001] The invention relates to the field of flat panel display, in particular to an OLED display panel and a driving method thereof. Background technique [0002] Currently, OLED (Organic Light-Emitting Display) display is a next-generation flat panel display technology similar to and better than LCD (Liquid Crystal Display). OLED displays have a very simple sandwich structure, with two layers of electrodes sandwiching a very thin layer of organic material that emits light when an electric current passes through it. Compared with LCD display, OLED has many advantages: since the organic light-emitting diode itself can emit light without backlight, OLED display can be made lighter and thinner, has a wider viewing angle, richer colors, and can significantly save power . The pixel size of the OLED display can achieve the accuracy of tens to hundreds of microns, and the display resolution can reach >300PPI (the number of pixels per inch). Based on these adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/32H01L51/52G09G3/3233G09G3/3208
Inventor 蔡韬
Owner SHANGHAI TIANMA MICRO ELECTRONICS CO LTD