Abstract:
A display unit is provided. The display unit includes a multiplexer circuit, a latch circuit, and a liquid crystal capacitor. The multiplexer circuit receives a plurality of voltages. The plurality of voltages at least comprises a first voltage and a second voltage. The latch circuit receives a driving signal and a first data signal. When the driving signal is at an asserted state, the latch circuit controls the multiplexer circuit according to the first data signal to select the first voltage or the second voltage to serve as a display voltage. The liquid crystal capacitor receives the display voltage. The liquid crystal capacitor has a plurality of liquid crystal molecules, and an optical state of the plurality of liquid crystal molecules is determined according to the display voltage.
Abstract:
A driving method of multi-stable display is provided. A first voltage is provided to a scan line of a pixel if a state of the pixel is not changed. If the pixel is set to a bright state, voltages V2 and V4 are provided to the scan line and a data line in a first phase, and voltages V3 and V5 are provided to the scan and the data lines in a second phase. |V2−V4| and |V3−V5| are smaller than a first threshold voltage. If the pixel is set to a dark state, voltages V2 and V5 are provided to the scan and the data lines in the first phase, and voltages V3 and V4 are provided to the scan and the data lines in the second phase. |V2−V5| and |V3−V4| are greater than a second threshold voltage, and the second threshold voltage is greater than the first threshold voltage.
Abstract:
A bi-stable active matrix (AM) display apparatus and a method for driving a display panel thereof are provided. The bi-stable AM display apparatus includes a bi-stable AM display panel, a scan driver, a data driver and a controller. A frame period is divided into a resetting phase and a determining phase. The controller resets pixels on a plurality of scan lines of the bi-stable AM display panel to a homotropic state in the resetting phase through the scan driver and the data driver. The controller writes frame information into the pixels on the scan lines in the determining phase through the scan driver and the data driver.
Abstract:
The disclosure provides an operating method for an active-matrix bistable liquid crystal display (LCD) in which each frame of the LCD is refreshed during a single frame time. The method includes the steps of: driving an external charge voltage to a row of pixels of the LCD; removing the external charge voltage from the row of pixels, and then the row of pixels being driven by an internal storage-capacitor voltage of the row of pixels in the following first time interval; driving an external recharge voltage to the row of pixels; removing the external recharge voltage from the row of pixels, and then the row of pixels being driven by an internal storage-capacitor voltage of the row of pixels in the following second time interval; and driving an external discharge voltage to the row of pixels.
Abstract:
A driving device of a passive matrix (PM) bistable display and a real-time touch input display method thereof are provided. The real-time touch input display method includes following steps. First, a touch event of a touch panel is detected to obtain a touch coordinate. When the touch event occurs, one of a plurality of scan lines of the PM bistable display is selected as a corresponding scan line according to the touch coordinate, and a corresponding pixel on the corresponding scan line is driven according to the touch coordinate.
Abstract:
A power-on management circuit for a memory device is provided. The power-on management circuit comprises a first external power-on voltage detector, a second external power-on voltage detector, a delay unit, a logic circuit, an internal power-on voltage detector, a voltage control circuit, a plurality of first electric pumps and a second electric pump. The first external power-on voltage detector has a first voltage threshold, receives a first external voltage, and generates a first control signal when the first external voltage is higher than the first voltage threshold. The second external power-on voltage detector has a second voltage threshold, receives a second external voltage, and generates a second control signal when the second external voltage is higher than the second voltage threshold.
Abstract:
A power-on management circuit for a memory device is provided. The power-on management circuit comprises a first external power-on voltage detector, a second external power-on voltage detector, a delay unit, a logic circuit, an internal power-on voltage detector, a voltage control circuit, a plurality of first electric pumps and a second electric pump. The first external power-on voltage detector has a first voltage threshold, receives a first external voltage, and generates a first control signal when the first external voltage is higher than the first voltage threshold. The second external power-on voltage detector has a second voltage threshold, receives a second external voltage, and generates a second control signal when the second external voltage is higher than the second voltage threshold.
Abstract:
A voltage providing circuit includes: a first voltage providing circuit, for generating a first voltage; a switch device, for receiving a first voltage; a second voltage providing circuit, for providing a second voltage; a control circuit, for controlling the switch device and the second voltage providing circuit, wherein in a first mode, the control circuit turns off the switch device for allowing a target device to receive the second voltage, and in a second mode, the control circuit turns on the switch device and stops the second voltage providing circuit from providing the second voltage such that the target device can receive the first voltage; and an adjusting circuit, for providing a reference voltage to the first voltage providing circuit according to the first voltage and the second voltage for changing the first voltage, thereby making the first voltage substantially equal to the second voltage.
Abstract:
This invention provides a driving circuit for simultaneously driving three-color bistable liquid crystals, which employs a voltage-shift circuit to provide different-color bistable liquid crystals with respective level-shift voltages. A grey-scale voltage is respectively added to the respective level-shift voltages. By this invention, the whole grey-scale voltages are capable of falling in the voltage ranges for displaying grey scales for the different-color bistable liquid crystals. The grey-scale display can be optimized.
Abstract:
A voltage booster and a memory structure using the same are provided. When a data storage unit in the memory structure is in normal operation, all voltage pumps in the voltage booster are turned on for boosting a supply voltage. However, when the data storage unit is in standby state, in the voltage booster, some voltage pumps are turned on while other voltage pumps are turned off, for boosting the supply voltage. Accordingly, the standby current and power consumption are reduced and the pump efficiency is improved.