Display substrate, manufacturing method thereof, and display device

Abstract

The invention provides a display substrate, a manufacturing method thereof, and a display device, belonging to the technical field of display. Among them, the manufacturing method of the display substrate includes the step of manufacturing a driving thin film transistor on the base substrate, and the driving thin film transistor includes a gate insulating layer. The manufacturing method includes: manufacturing a variety of different thick gate insulating layer. The technical solution of the present invention can prepare driving thin film transistors with different on-state currents on the same display substrate to drive sub-pixels with different luminous efficiencies, thereby improving the resolution of the OLED display device.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a display substrate, a manufacturing method thereof, and a display device. Background technique [0002] OLED technology has been widely used in the fields of display and lighting, and has achieved fruitful results. White Organic Light Emitting (WOLED) is one of the key points in the OLED research field. In terms of application, white organic light emitting OLED can not only be used as a lighting device directly, but also can be made into a backlight source in a liquid crystal display and a full-color OLED display. In order to obtain white light, the principle of three primary colors can be used to mix red, green and blue luminescent dyes in a certain proportion to produce white light. [0003] The WOLED display panel realizes color display by passing the white light emitted by the light-emitting layer through three color filters of red, green and blue. However, the tr...

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Problems solved by technology

However, the transmittance of white light to red, green, and blue color filters is different. To obtain red, green, and blue light with the same brightness, the thin-film transistors corresponding to the red, green, and blue sub-pixels must provide different driving currents. In this way, the thin film transistors corresponding to the red, green, and blue sub-pixels must have different width-to-length ratios. Therefore, different sub-pixels occupy different areas on the display panel. For example, the transmittance of white light to red and blue color films is relatively low. To obtain the same brightness as the green sub-pixel, the red and blue sub-pixels must provide a larger on-state current, and the design needs to make the thin film transistors corresponding to the red and blue sub-pixels occupy a larger area, so that large-size OLED Display resolution is difficult to further improve

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