OLED Display Driver Circuits and Techniques
First Claim
1. An organic light emitting diode (OLED) display, the display comprising:
- a display substrate bearing a plurality of OLED pixels and having a plurality of chiplets mounted on said display substrate, wherein each said chiplet comprises a silicon integrated circuit coupled to a set of one or more said OLED pixels and bearing one or more pixel driver circuits for said set of one or more OLED pixels, and wherein each said chiplet is located adjacent said set of OLED pixels to which it is coupled;
wherein a said pixel driver circuit comprises an output pixel driver transistor having first and second drain/source connections and a control connection;
wherein said first drain/source connection is coupled to a first power supply line of said chiplet;
wherein said second drain/source connection provides a drive output to an associated said OLED pixel; and
wherein said pixel driver circuit further comprises a cascode transistor coupled between said second drain/source connection of said output pixel driver transistor and said associated OLED pixel, said cascode transistor having a first drain/source connection coupled to said second drain/source connection of said output pixel drive transistor, a second drain/source connection coupled to a first connection of said associated OLED pixel, and a control connection coupled to a bias voltage line.
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Abstract
We describe a method of driving an OLED display. The OLED display comprises a plurality of pixel driver circuits on chiplets, each pixel driver circuit comprising an output transistor for driving a first connection of an associated OLED pixel. A cascode transistor on the chiplet is coupled between the output transistor and the first connection of said associated OLED pixel. A power supply is provided to the chiplet, defining a chiplet voltage range. A second connection of the associated OLED pixel is connected to an OLED voltage outside said chiplet voltage range. The OLED pixel is then driven using the pixel driver circuit on the chiplet over an OLED voltage range greater than said chiplet voltage range. In some preferred embodiments a drain connection of the cascode transistor is set at a voltage below a ground or negative (Vss) power supply to a chiplet.
149 Citations
23 Claims
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1. An organic light emitting diode (OLED) display, the display comprising:
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a display substrate bearing a plurality of OLED pixels and having a plurality of chiplets mounted on said display substrate, wherein each said chiplet comprises a silicon integrated circuit coupled to a set of one or more said OLED pixels and bearing one or more pixel driver circuits for said set of one or more OLED pixels, and wherein each said chiplet is located adjacent said set of OLED pixels to which it is coupled; wherein a said pixel driver circuit comprises an output pixel driver transistor having first and second drain/source connections and a control connection; wherein said first drain/source connection is coupled to a first power supply line of said chiplet; wherein said second drain/source connection provides a drive output to an associated said OLED pixel; and wherein said pixel driver circuit further comprises a cascode transistor coupled between said second drain/source connection of said output pixel driver transistor and said associated OLED pixel, said cascode transistor having a first drain/source connection coupled to said second drain/source connection of said output pixel drive transistor, a second drain/source connection coupled to a first connection of said associated OLED pixel, and a control connection coupled to a bias voltage line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of driving an organic light-emitting diode (OLED) display, the method comprising:
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providing a plurality of pixel driver circuits for an OLED display on a plurality of chiplet silicon substrates, wherein each said pixel driver circuit comprises an output transistor for driving a first connection of an associated OLED pixel; providing a cascode transistor on a said chiplet silicon substrate, wherein said cascode transistor is coupled between said output transistor and said first connection of said associated OLED pixel; providing a power supply to said chiplet silicon substrate, said power supply defining a chiplet voltage range; providing a second connection of said associated OLED pixel with an OLED voltage outside said chiplet voltage range; and driving said associated OLED pixel using said pixel driver circuit on said chiplet over an OLED voltage range greater than said chiplet voltage range. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A system for driving an organic light-emitting (OLED) display, the display comprising:
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a plurality of pixel driver circuits for the display on a plurality of chiplet silicon substrates, wherein each said pixel drier circuit comprises an output transistor for driving a first connection of an associated OLED pixel; a cascode transistor on a said chiplet silicon substrate, wherein said cascode transistor is coupled between said output transistor and said first connection of said associated OLED pixel; and a power supply to said chiplet silicon substrate, said power supply defining a chiplet voltage range; a line connecting a second connection of said associated OLED pixel to an OLED voltage outside said chiplet voltage range; wherein a said pixel driver circuit is configured to drive said associated OLED pixel using said pixel driver circuit on said chiplet over an OLED voltage range greater than said chiplet voltage range. - View Dependent Claims (23)
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Specification