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OLED array substrate and preparation method therefor and OLED display apparatus

An array substrate and insulating layer technology, which is applied in the manufacture of semiconductor/solid-state devices, semiconductor devices, electrical components, etc., can solve the problems of incomplete gray-scale display, affecting the display effect of OLED displays, etc., so as to improve the display effect and enhance the display effect. , to avoid the effect of voltage changes

Inactive Publication Date: 2017-09-15
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, in order to speed up the switching speed of the switching transistor, the switching transistor generally needs to have a lower sub-threshold swing (SS); and in order to better display different gray scales of the OLED display, the driving transistor requires a larger sub-threshold swing (SS), otherwise, too fast voltage changes will cause incomplete grayscale display and affect the display effect of OLED displays

Method used

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  • OLED array substrate and preparation method therefor and OLED display apparatus
  • OLED array substrate and preparation method therefor and OLED display apparatus
  • OLED array substrate and preparation method therefor and OLED display apparatus

Examples

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Effect test

Embodiment 1

[0030] This embodiment provides an OLED array substrate, such as figure 1 As shown, it includes a switch tube 1 for controlling pixel display and a drive tube 2 for driving pixel display. The switch tube 1 includes a first insulating layer 13 disposed between its active layer 11 and gate 12; the drive tube 2 includes a second insulating layer 23 disposed between its active layer 21 and gate 22, and the dielectric constant of the first insulating layer 13 is higher than that of the second insulating layer 23.

[0031] By making the dielectric constant of the first insulating layer 13 higher than the dielectric constant of the second insulating layer 23, the capacitance between the grid 12 of the switching transistor 1 and the active layer 11 can be increased relative to the driving transistor 2, so that The subthreshold swing of the switch tube 1 is lower than that of the drive tube 2, thereby increasing the switching rate of the switch tube 1; at the same time, the capacitance...

Embodiment 2

[0046] This embodiment provides an OLED array substrate. The difference from Embodiment 1 is that the first insulating layer includes a bottom layer film and a top layer film overlapping each other, the bottom layer film is in contact with the active layer, and the top layer film is in contact with the gate. The bottom film is made of silicon dioxide, the top film is made of silicon nitride; the second insulating layer is made of silicon dioxide.

[0047] With such an arrangement, the bottom film of the silicon dioxide material is in contact with the active layer, which can reduce the interface defects of the active layer and improve the interface effect of the active layer, thereby making the switching control performance of the switching tube more stable.

[0048] Correspondingly, in this embodiment, the thickness of the bottom film is 30-50 nm, the thickness of the top film is 50-150 nm; the thickness of the second insulating layer is 120-200 nm.

[0049] The first insulati...

Embodiment 3

[0053] This embodiment provides an OLED display device, including the OLED array substrate in Embodiment 1 or 2.

[0054] By adopting the array substrate in embodiment 1 or 2, the response speed of the OLED display device is improved, and the display effect of the OLED display device is improved.

[0055] The OLED display device provided by the present invention can be any product or component with a display function such as an OLED panel, an OLED TV, a monitor, a mobile phone, a navigator, and the like.

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Abstract

The invention provides an OLED array substrate and a preparation method therefor and an OLED display apparatus. The OLED array substrate comprises a switching tube used for controlling pixel display, and a driving tube used for driving pixel display; the switching tube comprises a first insulating layer arranged between an active layer and a gate thereof; the driving tube comprises a second insulating layer arranged between an active layer and a gate thereof; and the dielectric constant of the first insulating layer is higher than that of the second insulating layer. By virtue of the OLED array substrate, the capacitance between the gate and the active layer of the switching tube can be improved relative to that of the driving tube, so that the sub threshold value swing of the switching tube is lowered relative to that of the driving tube, and the switching rate of the switching tube is further improved; and meanwhile, the capacitance between the gate and the active layer of the driving tube can be lowered relative to that of the switching tube, so that the voltage change of the driving tube is delayed, the sub threshold value swing of the driving tube is improved relative to that of the switching tube, and the gray scale display effect of the OLED display device is further reinforced.

Description

technical field [0001] The present invention relates to the technical field of mobile devices, in particular to an OLED array substrate, a preparation method thereof, and an OLED display device. Background technique [0002] With the development of display technology, Organic Light-Emitting Diode (OLED) display technology has the advantages of self-illumination, wide viewing angle, high contrast, low power consumption, high response speed, etc., and has become a research hotspot. [0003] In the field of flat panel display technology, Low Temperature Poly-silicon Thin Film Transistor (LTPS TFT for short) has the advantages of high response speed, high aperture ratio, and high brightness. LTPS technology is becoming more and more popular in the market. And it can also be used in flexible displays and organic light-emitting diode displays, known as next-generation display technology. [0004] A switching transistor (Switching TFT) for controlling pixel display and a driving t...

Claims

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Application Information

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IPC IPC(8): H01L27/32H01L27/12H01L21/77
CPCH01L27/1237H01L27/1259H10K59/12
Inventor 王利忠
Owner BOE TECH GRP CO LTD
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