Digital-to-analog converter, data driver, and display device
US12205508B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 2024 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | Jan 15, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0291
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure includes: a decoder generating multiple input voltages each having one or the other of two reference voltages selected from multiple reference voltages, using a high voltage digital data signal obtained by increasing the amplitude of a low voltage digital data signal; and a differential amplifier including multiple differential pairs and receiving the input voltages at the non-inverting input terminals of the differential pairs and receiving an output voltage signal at the inverting input terminals to generate an output voltage signal having one of the voltage levels obtained by dividing the two reference voltages into a power of 2. The differential amplifier includes: multiple current sources generating tail currents flowing through the tails of the differential pairs; and multiple clamp transistors provided respectively between the tails of the differential pairs and the current sources and holding a voltage applied to each current source at or below a low voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.