摘要:
A display device (1) comprises two or more groups of display elements having electrophoretic particles (8,9), a pixel electrode (5) and a counter electrode (6). Drive signals (50, (V,t)drive, (V,t)reset) are supplied to the electrodes to bring the display elements in a predetermined optical state. The drive signals are preceded by preset signals (53, (V,t)preset) to release the electrophoretic particles but too low in intensity to enable the particles to change the optical state significantly. The preset signals supplied to the groups show differences in phase. This reduces flicker. The preset and drive signals are, in operation, so supplied that the phase of the preset pulse preceding the drive pulse is, in respect of the drive pulse, substantially the same for all groups. The combination of a drive and preceding preset pulse is then for the groups substantially the same, reducing grey level variations.
摘要:
An electrophoretic display panel (1), comprises drive means (100), for controlling the potential difference of each picture element (2) to be a reset potential difference having a reset value and a reset duration for enabling particles (6) to substantially occupy one of the extreme positions. The reset pulses are applied in two or more pulses separated by a non-zero time interval during a reset period (Preset).
摘要:
The electrophoretic display panel (1) for displaying a picture and a subsequent picture has drive means (100) which are able to control for each pixel (2) the potential difference to have a picture value to provide the pixels (2) with a respective picture appearance being either extreme or intermediate, subsequently to have an inter-picture value to provide the pixels (2) with a respective inter-picture appearance, and subsequently to have a subsequent picture value. For the display panel (1) to be able to provide the pixels (2) with the inter-picture appearances which are in general relatively little visible, the drive means (100) are able to control for each pixel (2) an estimate potential difference as the inter-picture value to provide the pixels (2) with a respective estimate picture appearance as the inter-picture appearance.
摘要:
In a method of driving an electrophoretic display, during an image update period (IUi) wherein the pixels (18) of the display are addressed to refresh an image displayed, a chive waveform (DWi) is supplied (10,16) to an associated one of the pixels (18). The drive waveform (DWi) comprises successively a first pulse (Ri, Si) with a first voltage level (+VM, −VM) and a drive pulse (Di) with second voltage level (VDi). The drive pulse (Di) has a variable voltage level to allow obtaining a desired intermediate optical state of the pixel (18) with a high accuracy. An absolute value of the second voltage level (VDi) of the drive pulse (Di) is smaller than an absolute value of the first voltage level (+VM, −VM) of the first pulse (Ri, Si), to minimize the total image update time.
摘要:
An electrophoretic display has at least one pixel (18) which comprises electrophoretic material (8, 9), a first electrode (6) and a second electrode (5). An addressing circuit (16, 10) addresses the at least one pixel (18) by applying between the first electrode (6) and the second electrode (5): (i) a drive pulse (Vdr) with a level in accordance with an optical state to be reached by the at least one pixel (18), and (ii) a series of shaking pulses (SP) which have an energy content depending on an optical state of the at least one pixel (18).
摘要:
A bi-stable display (100) is driven by supplying (101) voltage waveforms to pixels (18) of the display (100). It is determined (150), based on information to be displayed (DI) on the display (100) during an image update period (IUP), which pixels (18) have to change their optical state during the image update period (IUP). A sub-area of pixels (WI) is determined (151) which has to be updated during this image update period (IUP). The dimensions of the sub-area (W1) are dynamically determined to cover the pixels (18) which have to change their optical state during this image update period (IUP). The drive circuit (101) is controlled (152) to only address the pixels (18) of the sub-area (WI).
摘要:
An electrophoretic display device (1) comprises at least one pixel (10) with an electrophoretic medium, and at least two electrodes (6, 7), as well as drive means (4) via which the pixels can be brought to different optical states comprising an applicator means for applying a voltage difference between the electrodes. The grey levels of the cells are set by providing a steady low voltage to the cells. A pulse voltage may in preferred embodiments be used to bring the grey level close to the intended level.
摘要:
The electrophoretic display panel (1) for displaying a picture, has a first and a second opposed substrate (8,9), an electrophoretic medium (5) between the substrates (8,9), a plurality of pixels (2), a first and a second electrode (3,4) associated with each pixel (2), drive means (100) and a temperature probe (11). The electrophoretic medium (5) has charged particles (6) in a fluid. The first and the second electrode (3,4) are able to receive a potential difference having a duration and a level. The drive means (100) are able to control the potential differences for displaying the picture, and the temperature probe (11) is able to measure a temperature indicative for the medium temperature. For the display panel (1) to be able to have pixels (2) with substantially reproducible appearances requiring relatively little energy independent of the ambient temperature, the drive means (100) are able to receive the measured temperature from the temperature probe (11) and to control the potential differences in dependence of the measured temperature.
摘要:
An electrophoretic display panel (1), comprising a plurality of picture elements (2), an electrophoretic medium (5) having charged particles (6), and first and second electrodes (3,4) associated with each picture element (2) for receiving a potential difference. As the display (1) is addressed, for each picture element (2), the product of voltage and duration of picture voltages is read from a controller (102). After one or more image update periods, there will be a history generated of the total energy seen by each picture element (2). DC balancing is achieved by introducing feedback loop into the controller (102) which attempts to reduce the number stored in the memory (104) to zero, for each picture element (2) by applying one or more high voltage short pulses with a polarity opposite to the number stored in the memory (104).
摘要:
Several possibilities of driving devices (13,14,15) for optical switches, especially displays (1) based on the principle of electrowetting are given. This principle uses optical switches comprising a first fluid (5) and a second fluid (6) immiscible with each other within a space between a first transparent support plate (3) and a second support plate (4), the second fluid being electro˜conductive or polar.