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Electronic Devices With Low Refresh Rate Display Pixels

A display, pixel technology, used in static indicators, instruments, etc., that solves problems such as difficult to implement designs, does not satisfactorily improve response times, and does not adequately address threshold voltage variations

Active Publication Date: 2019-03-01
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such circuits may not adequately account for all threshold voltage variations, may not improve response time satisfactorily, and may have difficult-to-implement designs

Method used

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  • Electronic Devices With Low Refresh Rate Display Pixels
  • Electronic Devices With Low Refresh Rate Display Pixels
  • Electronic Devices With Low Refresh Rate Display Pixels

Examples

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Embodiment Construction

[0025] Displays in electronic devices may be provided with driver circuits for displaying images on an array of display pixels. figure 1 An exemplary display is shown in . Such as figure 1 As shown, display 14 may have one or more layers, such as substrate 24 . A layer such as substrate 24 may be formed from a planar rectangular layer of material such as a planar glass layer. Display 14 may have an array of display pixels 22 for displaying images to a user. The array of display pixels 22 may be formed from rows and columns of display pixel structures on a substrate 24 . These structures may include thin film transistors, such as polysilicon thin film transistors, semiconductor oxide thin film transistors, and the like. There may be any suitable number of rows and columns in the array of display pixels 22 (eg, ten or more, one hundred or more, or one thousand or more).

[0026] Display driver circuitry, such as display driver integrated circuit 16 , may be coupled to condu...

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PUM

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Abstract

The invention discloses electronic devices with low refresh rate display pixels. The display may have an array of organic light-emitting diode display pixels operating at a low refresh rate. Each display pixel may have six thin-film transistors and one capacitor. One of the six transistors may serve as the drive transistor and may be compensated using the remaining five transistors and the capacitor. One or more on-bias stress operations may be applied before threshold voltage sampling to mitigate first frame dimming. Multiple anode reset and on-bias stress operations may be inserted during vertical blanking periods to reduce flicker and maintain balance and may also be inserted between successive data refreshes to improve first frame performance. Two different emission signals controllingeach pixel may be toggled together using a pulse width modulation scheme to help provide darker black levels.

Description

[0001] This application claims priority to U.S. Patent Application No. 15 / 996,366, filed June 1, 2018, and Provisional Patent Application No. 62 / 547,030, filed August 17, 2017, which are hereby incorporated by reference in their entirety into this article. technical field [0002] The present invention relates generally to electronic devices, and more particularly, to electronic devices having displays. Background technique [0003] Electronic devices often include displays. For example, cellular telephones and portable computers include displays for presenting information to users. [0004] Displays, such as organic light emitting diode displays, have arrays of display pixels based on light emitting diodes. In this type of display, each display pixel includes a light-emitting diode and a thin-film transistor that controls the application of a signal to the light-emitting diode to produce light. [0005] Threshold voltage variations in thin film transistors can cause unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G3/3233G09G3/3225G09G2310/0262G09G2310/0297G09G2320/0252G09G2300/0861G09G2320/0247G09G2300/0417G09G2300/043G09G2320/045G09G2300/0819G09G2310/061G09G2320/0242G09G2320/064G09G2320/043G09G2340/0435G09G2310/06G09G2320/0214
Inventor 林敬伟杨玄钱闯A·嘉姆史迪罗德巴里常鼎国
Owner APPLE INC
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