摘要:
This invention relates to an non-emissive display device which is arranged to operate using electro-optical modes, said display device comprising at least one individually addressable pixel (1,10), wherein at least one of scattering and absorption of light is arranged to occur within said pixel. The device comprises means for monitoring a grey scale level (8b,8c,8d,8e,15) within said at least one pixel (1,10), means for adjusting the grey scale level (20,21) of said pixel (1,10) and means for feeding grey scale information from said monitoring means to said adjusting means in order to control said adjusting means. The invention also relates to a method of driving a pixel of such a non-emissive display device.
摘要:
The electrophoretic display panel (1) for displaying a picture corresponding to image information has drive means (100) which are able to control for each picture element (2) the potentials, thereby being able to change the position of the particles (6) based on the image information. Furthermore, the display panel (1) has monitoring means (101) which are able to generate for each picture element (2) actual position information indicative for the actual position of the particles (6), and control means (103) which are able to control for each picture element (2) the drive means (100) in dependence of the actual position information and the image information to reduce a difference between the position of the particles (6) and the position off the particles (6) corresponding to the image information. For the display panel (1) to be able to provide a picture of relatively high quality even at relatively low or nonuniform intensities of the ambient light, the monitoring means (101) comprise electrical means (102) which are able to generate for each picture element (2) the actual position information based on an electrical property of the respective picture element (2).
摘要:
This invention relates to an in-plan switching electrophoretic display device (IPS-EPD), comprising a layer of electrophoretic material (2), being sandwiched between a first and a second substrate (3, 4), a pixel of said display further comprising a first and a second electrode (5, 6) for locally controlling the material of said electrophoretic layer. The first and second electrodes (5, 6) are positioned on essentially the same distance from said first substrate, so that an essentially lateral field is generated in said electrophoretic layer (2) when a signal is applied over said electrodes (5, 6), in order to enable transflective operation. The display device may further comprise an optionally patterned reflector (8), and a light schielding layer (7).
摘要:
A touch sensitive matrix display senses touch input during a sense period (TS) in a separate sense area (A1) which is selected to be non-overlapping with a display area (A2) in which information is displayed dependent on the touch position which is sensed in the sense area (A1). During the sense period (TS), the sense area (A1) is not addressed. The non-address period of time (TR) occurring between two successive sense area addressing periods (TA2) of the sense area (A1) lasts at least as long as, but preferably substantially longer than, the display area address period (TA1,i) required to address the complete display area (A2). The data displayed in the sense area (A1) is refreshed by addressing the sense area (A1) during the sense area address periods (TA2) in-between the sense periods (TS). The data displayed in the sense area (A1) will not be disturbed by the sensing and will be present between two successive sense area addressing periods (TA2, TA2′) because the pixels 10 of the matrix display have an optical state which, when not addressed, is maintained longer than the non-address period (TR).
摘要:
The electrophoretic multi-color display device has a plurality of cells (10, 10′, 10″, . . . ) with an electrophoretic medium (14) and pixel electrodes (11, 11, 11″, . . . ) for selecting a subgroup of cells. A color filter array (13) is associated with the pixel electrodes. The color filter array (13) and the pixel electrodes (11, 11′, 11, . . . ) are provided at the same side of the electrophoretic medium (14). Preferably, the cells (10, 10′, 10″, . . . ) of the color filter array (13) are arranged according to a matrix and are disposed along lines registering with the pixel electrodes (11, 11, 11″, . . . ). Preferably, an insulating material (17) with a relatively low refractive index is provided between the pixel electrodes (11, 11, 11″ . . . ) and the color filter array (13). Preferably, the insulating material (17) is selected from the group formed by a fluor-polymer, a low-dielectric inorganic film and a low-dielectric nano-porous film.
摘要:
The invention relates to an electro-optically active display device, comprising at least one individually addressable pixel, each pixel being provided with an obstructing element (3), such as a reservoir light shield, a black matrix or a mirror element. According to the invention, a portion of at least one component is positioned beneath the obstructing element in such a way that the portion is not visible for a viewer of the display device.
摘要:
A touch sensitive matrix display senses touch input in sense periods (SP) which are selected to occur non-concurrently with data (DA) written to the pixels (10) of the matrix display during the addressing period (AP). As now, no data (DA) is written to the display while the sensing is performed during the sense periods (SP), the sensing will be less complicated. The sense periods (SP) are selected to occur in-between successive addressing periods (AP) because the display has pixels (10) of which the optical state is maintained substantially longer than the addressing period (AP) lasts. Such a hold period (HP) which lasts substantially longer than the addressing period (AP) is for example available in bistable displays such as electrophoretic displays.
摘要:
An electrophoretic display (1) comprising an electrophoretic medium (5) comprising a plurality of negatively charged black particles (6) and a plurality of positively charged white particles (6) in fluid. The average dc value of the drive voltages is arranged to be non-zero, so as to maximise brightness or contrast ratio of the displayed image, as required. If the average dc value of the drive voltages has a positive polarity, such that a small positive voltage is applied to the pixel electrode (3), although the white level may be less bright, the black level becomes darker, thereby increasing the contrast ratio during the driving sequence, which is obviously advantageous if the contrast ratio is the most important display parameter. If, on the other hand, maintaining or increasing a maximum brightness level is of key importance, then a drive sequence where the average dc value of all drive waveforms has a negative polarity is applied, so as to apply a small, controlled negative voltage to the pixel electrode (3). In this case, although the black level may become less dark, the white level becomes significantly brighter, such that the brightness is increased during the driving sequence, which is obviously advantageous if brightness is the most important display parameter.
摘要:
An electrophoretic display device (1) comprising one pixel (10) with an electrophoretic medium (13), electrodes (6, 7), as well as drive means (4) by which the pixels can be brought into different optical states. Some time (thold) after the application of an addressing pulse (Paddress) for setting the brightness level (Rw, Rb) of a pixel (10), a restore pulse voltage (Prestore) is applied between the electrodes (6,6′,7) for restoring the brightness level of a pixel to the set level (Rw, Rb). The restore pulse may be a set of consecutive pulses to bring the drifted brightness level even more smoothly (i.e. less perceivably) back to the original brightness level.
摘要:
The electro-optical display device has a translucent front wall (12) and at least one pixel (10) with an electro-optical medium, a scattering medium (14) and a switching electrode (6) associated with the front wall (12), and drive means via which the pixel (10) can be brought to different optical states. According to the invention, the pixel (10) comprises a low-refractive index C material (21) with a refractive index nt in the range from 1.0≦1.4.4. Preferably, the low-refractive index material (21) is provided between the switching electrode (6) and the electro-optical medium. Preferably, the electro-optical medium is an electro-phoretic medium or an electro-chromic medium. The electro-optical display device combines a high brightness with a wide viewing angle.