Display substrate, display panel and fabrication method of display substrate

Abstract

The invention relates the technical field of display, and discloses a display substrate, a display panel and a fabrication method of the display substrate. The display substrate comprises a substrate, a plurality of sub-pixel regions and an isolation layer, wherein the plurality of sub-pixel regions are arranged on a surface of the substrate in an array way, the isolation layer is arranged on the surface of the substrate and comprises a box dam and a plurality of partition dams, the box dam is arranged at outer sides of the plurality of sub-pixel regions, the plurality of partition dams are arranged in the box dam and are arranged in parallel, intervals are reserved between end parts of the partition dams and the box dam, and the plurality of sub-pixel regions are partitioned into a plurality of passages by the partition dams. When functional layers of sub-pixels are formed by ink-jet printing method, ink droplets can be sprayed out of each passage if materials of functional layers of the sub-pixels with different colors are same, the ink droplets can freely flow in the plurality of passages until the volumes of the ink droplets are uniform, thus, the control accuracy of volume difference among nozzles can be greatly reduced, the fabrication difficulty of the display substrate is reduced, and the display quality of the display panel can be further improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a display substrate, a display panel and a method for manufacturing the display substrate. Background technique [0002] OLED (Organic Light-Emitting Diode, organic light-emitting diode, referred to as OLED) display is thin, light, wide viewing angle, active light emission, continuously adjustable light color, low cost, fast response, low energy consumption, and low driving voltage. Low temperature, wide operating temperature range, simple production process, high luminous efficiency and flexible display, etc., have been listed as a promising next-generation display technology. [0003] The film-forming methods of each functional layer of OLED mainly include evaporation process and solution process. Evaporation process is relatively mature in the application of small-sized OLEDs, and this technology has been applied to mass production at present; in solution process, the film-f...

AI Technical Summary

Problems solved by technology

[0005] Usually, when the nozzles of the inkjet printing equipment leave the factory, the ink ejection volume of each nozzle cannot be completely guaranteed to be completely consistent. The volume error between nozzles cannot exceed 0.3%. Once the volume error between nozzles is greater than the above range, it will lead to uneven thickness of the functional layer between sub-pixels of the same color, such as figure 2 and image 3 As shown, the human eye can distinguish the resulting difference in luminous brightness between pixels, which will lead to poor brightness uniformity of OLED devices

[0006] At present, manufacturers of inkjet printing equipment generally equip each nozzle with 256 or 512 nozzles. When the resolution of mass-produced OLED display devices is 3840×2160, if a nozzle with 256 nozzles is used, 15 nozzles need to be equipped. In order to complete the monochrome printing in the 3840 direction, and the volume error of the 3840 nozzles must be controlled within 0.3%, for the 256 nozzles to correct the volume error to within 0.3%, it usually takes 3 to 5 hours, it is not difficult to imagine, for the 3840 The calibration of the volume of a nozzle is a long and iterative process, which will consume a lot of time and cost, and once the error exceeds the rated range in the calibration process, it will lead to poor display quality of the OLED device, which will cause users poor experience

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