Display substrate, preparation method thereof and display device

Abstract

The invention provides a display substrate. The display substrate comprises a plurality of pixel driving circuits; the plurality of light-emitting elements are connected with the plurality of pixel driving circuits in a one-to-one correspondence manner; the pixel driving circuit comprises a driving transistor, a threshold compensation transistor, a first reset transistor and a data write-in transistor. The gate of the driving transistor is connected with the threshold compensation transistor and the first reset transistor; the first electrode of the driving transistor is connected with the data writing transistor; the second electrode of the driving transistor is connected with the threshold compensation transistor and the light-emitting element; each transistor comprises a low-temperature polycrystalline silicon active region; the first electrodes of the first transistors respectively comprise a first heavily doped region, and the second electrodes of the first transistors respectively comprise a second heavily doped region; the first electrode of the threshold compensation transistor and / or the first reset transistor comprises a first lightly doped region, and the second electrode of the threshold compensation transistor and / or the first reset transistor comprises a second lightly doped region; the first lightly doped region is located between the first heavily doped region and the active region; the second lightly doped region is located between the second heavily doped region and the active region. The gravel mura can be improved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a display substrate, a preparation method thereof, and a display device. Background technique [0002] In recent years, flexible LTPS (Low Temperature Poly-Silicon, low temperature polysilicon) OLED (Organic Light-Emitting Diode, organic light-emitting diode) small and medium-sized display products have become the mainstream of the market. It also has many special advantages that rigid substrate OLED display products and other flat-panel display products do not have; however, LTPS OLED small and medium-sized display products will have some poor image quality, such as afterimages, green copper bars, low grayscale Mura, etc., among which Gravel mura (ie Sandy mura) is a relatively common and serious malady. [0003] Gravel mura is a kind of mura that is observed with the naked eye in a grayscale picture, and exists in a full screen but cannot be measured and quantifie...

AI Technical Summary

Problems solved by technology

[0004] According to the analysis and research, it is found that the gravel mura is mainly caused by the slight difference in the luminous brightness between pixels, so that the human eye will recognize the slight difference in the luminous brightness between pixels

The difference in luminous brightness between pixels is directly related to the pixel driving circuit. If the driving current of each pixel is inconsistent with the pixel driving circuit, it will lead to differences in the luminous brightness of each pixel.

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