Touch and display driver integrated circuit
By introducing multiple switches and low-dropout regulators into the TDDI circuit and using control signals to switch and adjust the voltage difference, the problem of increased component cross-voltage caused by substrate voltage was solved, and the voltage amplitude of the touch sensing signal was improved, thus meeting the needs of touch and display.
CN119576146BActive Publication Date: 2026-06-02RAYDIUM SEMICON
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- RAYDIUM SEMICON
- Filing Date
- 2023-09-19
- Publication Date
- 2026-06-02
Smart Images
Figure CN119576146B_ABST
Abstract
This invention provides a TDDI circuit, including first to sixth pins, first to second low-dropout regulators (LDOs), and first to seventh switches. A fourth pin is coupled to the first pin via a first external capacitor and provides a first drive voltage. The fourth pin is coupled to a first lower limit voltage. A fifth pin is coupled to the second pin via a second external capacitor and provides a second drive voltage. A sixth pin is coupled to the third pin via a third external capacitor and provides a substrate voltage. The sixth pin is coupled to a second lower limit voltage and a ground voltage. The first LDO provides a specific voltage. The second LDO provides an output signal. The first, fifth, and seventh switches are controlled by a first control signal. The second and sixth switches are controlled by a second control signal. The third and fourth switches are controlled by the third and fourth control signals, respectively.
Need to check novelty before this filing date? Find Prior Art