The present application discloses a picture storage method and a display panel. The picture storage method includes inputting a current frame picture into a gray scale judging module; judging a gray scale value of the current frame picture, and outputting the current frame picture to a corresponding data compression module; compressing the current frame picture by the data compression module according to a corresponding data compression ratio parameter; and sending the compressed current frame picture to a memory for storage.

A liquid crystal eWriter device with user adjustable select erase includes a front substrate formed of a flexible, polymeric material. Electrically conductive layers are spaced apart from each other. A dispersion layer includes a dispersion of cholesteric liquid crystal material and polymer disposed between the electrically conductive layers, wherein pressure applied to the front substrate changes a reflectance of the cholesteric liquid crystal material forming an image. Electronic circuitry is adapted to fully and selectively erase the image by applying a full erase voltage waveform and a select erase voltage waveform, respectively, to the electrically conductive layers. The image is select erased by applying the select erase voltage waveform to the electrically conductive layers while applying pressure to the front substrate and tracing a portion of the image. At least one SELECT ERASE actuator is included in the electronic circuitry and enables the user to adjust the select erase voltage waveform so as to adjust select erasing of the image. Also featured is a method of making select erase adjustments on the eWriter.

A driver circuit portion of a display device has a function in which image signals are written to a selected pixel successively so as to display an image on a screen and a function in which writing operation of an image signal is stopped and a transistor is turned off so as to maintain one image written to the screen when the one image is continuously displayed on the screen. Such functions are achieved by a transistor whose off current per micrometer in channel width is reduced to an extremely low value that is lower than 10 zA/?m at room temperature and lower than 100 zA/?m at 85? C.

A display panel driving apparatus and method are provided. The display panel driving apparatus includes a timing control circuit, a memory, a compensation circuit and a data driving circuit. The memory provides at least one coupling-capacitance information between a current pixel and at least one adjacent pixel in a display panel. By using the coupling-capacitance information, the compensation circuit compensates the current pixel data to obtain the compensated pixel data for compensating the voltage offset of the current pixel caused by the coupling voltage of the adjacent pixel. The data driving circuit drives the current pixel according to the compensated pixel data.

An method and apparatus are provided. The method includes, at an apparatus, determining a display mode to present content, selecting, based at least in part on the display mode, a display from a display module comprising a plurality of stacked displays, operatively coupled with the apparatus, and presenting at least a part of the content via the display.

A unit (10; 11; 12; 13) used to control a segment liquid crystal display (15; 16). The segment liquid crystal display (15; 16) includes at least a backplane electrode (20) and at least a front plane electrode (25) both associated with a same segment of the segment liquid crystal display (15; 16). The unit (10; 11; 12; 13) includes a controller (30; 40; 50) in order to generate a pulse-width-modulated control signal (35) that has two voltage levels and a variable duty cycle. The unit (10; 1; 12; 13) further includes an integrator (60; 61) to integrate the pulse-width-modulated control signal (35) and to provide an integrated control signal (90) which has more than two discrete voltage levels corresponding to different variable duty cycle values. An output of the unit (10; 11; 2; 13) supplies the integrated control signal (90) to the at least a backplane electrode (20) or to the at least a front plane electrode (25) so that visibility of the same segment in the segment liquid crystal display (15; 16) can be controlled. By having a pulse-width-modulated control signal (35) with only two voltage levels and different duty cycle values generated by the controller (30; 40; 50), and by having the integrator (60; 61) integrating said pulse-width-modulated control signal (35), more than two different discrete voltage levels are generated to control the at least a backplane electrode (20) or at least a front plane electrode (25) without the need to use an application specific segment liquid crystal interface in the unit (10; 11; 12; 13), thereby abating the cost of implementation of the unit (10; 11; 12; 13).

A driving method of cholesteric liquid crystal display is provided. A liquid crystal driving unit is used to output row driving voltage to multiple row circuit structures. Sequentially column driving voltage is outputted to multiple column circuit structures in a scanning manner. Scanning a column circuit structure takes one scanning time sequence. When starting the Nth time sequence of pixels to present the image, a ghost elimination voltage is applied to eliminate the image of the Mth time sequence and present it at the image position of the Nth time sequence, where M=N+1 and the ghost elimination voltage is applied at T. By doing so, the phenomenon of ghosts appearing on cholesteric liquid crystal displays can be improved, and the imaging quality of cholesteric liquid crystal displays can be improved.

A display device includes a display panel, an optical structure layer, a driving unit, a timing control unit and a light sensing unit. The optical structure layer is disposed on the display panel. The driving unit is electrically connected to the display panel. The timing control unit is electrically connected to the driving unit. The light sensing unit is electrically connected to the timing control unit to provide a light sensing result to the timing control unit. The timing control unit is used to receive a first signal and provides a second signal and a third signal to the driving unit according to the light sensing result, and the driving unit drives the display panel according to the second signal and the third signal.

A cholesteric liquid crystal display device with efficient charging capability and its charging method are provided. The cholesteric liquid crystal display device comprises a cholesteric liquid crystal display unit, a power unit, and a control unit. The power unit comprising a solar cell module and an energy storage module electrically connected to the solar cell module. When the control unit detects the electrical energy stored in the energy storage module is less than a threshold, the control unit drives the cholesteric liquid crystal display unit to display in the FC state, then allowing the solar cell module to charge. When the control unit detects that the electrical energy stored in the energy storage module is greater than the threshold, the control unit drives the cholesteric liquid crystal display unit to display in the PL state, thereby reduces any afterimages issues that may occur during image transitions of the display device.

A drive circuit has a ferroelectric liquid crystal panel that operates at a given switching angle and response speed, a sensor that measures temperature, a drive circuit that supplies driving voltage to the ferroelectric liquid crystal panel, a waveform generation circuit that supplies a waveform signal to the drive circuit, and a control circuit that controls the waveform generation circuit; and in a first frame of the driving voltage, outputs during a first interval, a first voltage that is positive and outputs during a second interval that is longer than the first interval, a second voltage that is positive, and in a second frame, outputs during the first interval, the first voltage that is negative and outputs during the second interval that is longer than the first interval, the second voltage that is negative. The control circuit varies the first voltage and the second voltage according to the measured temperature.