Pulse width modulation for driving pixel using comparator
US11430371B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 2021 |
| Grant date | Aug 30, 2022 |
| Priority date | — |
| Expiry date | Aug 24, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2370/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display device provides pulse width modulation (PWM) control of pixels using comparator circuits within each pixel. The display device includes a display panel and a row driver connected to the display panel. The row driver includes a counter configured to generate count bit values for subframes of a pulse width modulation (PWM) frame. The display panel includes pixels, each pixel including a comparator circuit and a light emitting diode. The comparator circuit includes a dynamic comparison node. The comparator circuit is configured to generate comparison results at the dynamic comparison node by comparing the count bit values of the subframes and data bit values of a control word defining a brightness level of the pixel for the PWM frame. The LED is configured to turn on or off responsive to the comparison results at the dynamic comparison node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.