Apple Inc.

Gihoon Choo

Chin-Wei Lin

Shinya Ono

Zino Lee

Hassan Edrees

Jie Won Ryu

Szu-Hsien Lee

Rungrot Kitsomboonloha

Jung Yen Huang

Pei-En Chang

Shih Chang Chang

Ting-Kuo Chang

Hyunwoo Nho

Peter F Holland

Kingsuk Brahma

Marc Joseph DeVincentis

Arthur L Spence

Kyung Wook Kim

Hyunsoo Kim

Hao-Lin Chiu

Shiping Shen

Jenny Hu

Graeme M Williams

Alex H Pai

Fan Gui

Jiun-Jye Chang

Chen-Ming Chen

Po-Chun Yeh

Shawn P Hurley

Ching-Sang Chuang

Chuan-Jung Lin

Yu-Wen Liu

Jongyup Lim

Ardra Singh

Akira Matsudaira

Chih Pang Chang

Chun-Chieh Lin

Hei Kam

Alexandre V Gauthier

Cheng Min Hu

Ing-Jye Wang

An electronic device may include processing circuitry configured to generate a first frame of image content and a second frame of image content. The second frame of image content is different from the first frame of image content. The electronic device may also include a display configured to display the first frame of image content at a first refresh rate. In response to receiving the second frame of image content, the electronic device may initially increase the refresh rate before tapering back to the first refresh rate while displaying the second frame of image content.

Frame insertion and frame rate sequencing for panel glitch prevention

A display may include an array of pixels. Each pixel in the array includes an organic light-emitting diode coupled to associated semiconducting oxide transistors. The semiconducting oxide transistors may exhibit different device characteristics. Some of the semiconducting oxide transistors may be formed using a first oxide layer formed from a first semiconducting oxide material using first processing steps, whereas other semiconducting oxide transistors are formed using a second oxide layer formed from a second semiconducting oxide material using second processing steps different than the first processing steps. The display may include three or more different semiconducting oxide layers formed during different processing steps.

Display circuitry with semiconducting oxide transistors

A display may include an array of pixels. Each pixel in the array includes an organic light-emitting diode coupled to associated thin-film transistors. The diode may be coupled to drive transistor circuitry, a data loading transistor, and emission transistors. The drive transistor circuitry may include at least two transistor portions connected in series. The data loading transistor has a drain region connected to a data line and a source region connected directly to the drive transistor circuitry. The data line may be connected to and overlap the drain region of the data loading transistor. The data line and the source region of the data loading transistor are non-overlapping to reduce row-to-row crosstalk.

Displays with reduced data line crosstalk

A display may include an array of pixels that receive control signals from a chain of gate drivers. Each gate driver may include a logic sub-circuit and an output buffer sub-circuit. The output buffer sub-circuit may include depletion mode semiconducting oxide transistors with high mobility. The logic sub-circuit may include semiconducting oxide transistors, some of which can be depletion mode transistors and some of which can be enhancement mode transistors with lower mobility. The logic sub-circuit may include at least a carry circuit, a voltage setting circuit, an inverting circuit, a discharge circuit.

Display with hybrid oxide gate driver circuitry having multiple low power supplies

A display is provided that includes an array of display pixels that receive data signals from display driver circuitry and that receive control signals from gate driver circuitry. The gate driver circuitry may include a chain of row driver circuits. Each row driver circuit may include a scan driver circuit and a scan inverter circuit. An enable transistor may be interposed between the scan driver circuit and the scan inverter circuit and may be selectively disabled to decouple the scan inverter circuit from the scan driver circuit to allow the scan inverter circuit to operate independent from the scan driver circuit. The scan inverter circuit may include a transistor that receives a scan pulse signal from the scan driver circuit and may further include additional transistors connected in a negative feedback configuration to reduce a drain-to-source voltage across the transistor to reduce leakage across the transistor during blanking times.

Display gate drivers for generating low-frequency inverted pulses

A display may include an array of pixels, where each pixel in the array includes an organic light-emitting diode coupled to associated thin-film transistors. The thin-film transistors may be controlled using at least first and second horizontal scan line signals. Loading different data values into any given row in the array may cause the scan line signals to exhibit varying rise/fall times, which results in horizontal crosstalk and luminance non-uniformity across the display. The rise and fall times of the second scan line signal are crucial, so the second scan line signal is driven by two separate scan line drivers formed on both sides of the display. Only the fall time of the first scan line signal is crucial, so the first scan line signal is driven by only one peripheral scan line driver and is coupled to an auxiliary pull-down circuit that is only activated during the pull-down transition.

Methods and apparatus for accelerating scan signal fall time to reduce display border width

A display may have rows and columns of pixels. Gate lines may be used to supply gate signals to rows of the pixels. Data lines may be used to supply data signals to columns of the pixels. The data lines may include alternating even and odd data lines. Data lines may be organized in pairs each of which includes one of the odd data lines and an adjacent one of the even data lines. Demultiplexer circuitry may be configured dynamically during data loading and pixel sensing operations. During data loading, data from display driver circuitry may be supplied, alternately to odd pairs of the data lines and even pairs of the data lines. During sensing, the demultiplexer circuitry may couple a pair of the even data lines to sensing circuitry in the display driver circuitry and then may couple a pair of the odd data lines to the sensing circuitry.

High frame rate display

A display may include an array of pixels, where each pixel in the array includes an organic light-emitting diode coupled to a drive transistor and other associated thin-film transistors. The array may be grouped into column pairs, where each column pair includes a first pixel column and a second pixel column that is mirrored with respect to the first pixel column. The drive transistors within each column pair may be formed towards the center of that column pair, whereas the data lines associated with that column pair may be formed along the outer peripheral edges of that column pair. Configured in this way, parasitic coupling between the data lines and any sensitive/floating nodes of the drive transistor may be substantially reduced, which mitigates pixel column crosstalk and ensures luminance uniformity across the display.

Mirrored pixel arrangement to mitigate column crosstalk

A display is provided that includes an array of display pixels that receive data signals from display driver circuitry and that receive control signals from gate driver circuitry. The gate driver circuitry may include a chain of row driver circuits. Each row driver circuit in the chain of row driver circuits may include a master driver stage, a slave driver stage, and associated control circuitry configured to receive a clock signal and a pulse signal from a preceding row driver in the chain. The master driver stage may be biased using fixed nominal power supply voltages, whereas the slave driver stage may be biased using dynamically adjustable power supply voltages that are optionally reduced relative to that of the nominal power supply voltages. One or more of the master and slave driver stages may be a bootstrapping driver stage having a bootstrapping capacitor.

Display gate drivers with dynamic and reduced voltage swing

Growing community of inventors

Santa Clara, CA, United States of America

Gihoon Choo