Abstract:
A lookup table is provided for storing voltage waveforms for transitions between a plurality of discrete pixel states forming a set that can be ordered in consecutive states according to a reflectivity of the pixel. An image controller is programmed to execute, in a consecutive drive phase, repeatedly the steps of retrieving an initial state and update state, matching, when the initial and update states are different, in the ordered set of pixel states of the lookup table, a consecutive state and a corresponding consecutive waveform, the consecutive state forming a path, according to the consecutive drive phase, from the initial state to the update state in the set of pixel states, storing the consecutive state in the memory as new initial state; and controlling a voltage driver to drive the pixel from the initial state to the consecutive state using said consecutive waveform.
Abstract:
The invention relates to display structure comprising a display medium having a first viewing surface, wherein for the same display medium the display structure is provided with a second viewing surface opposed to the first viewing surface. The invention further relates to a method for manufacturing a display structure.
Abstract:
The invention relates to display structure (10) comprising a display medium (6) having a first viewing surface (VI), wherein for the same display medium the display structure is provided with a second viewing surface (V2) opposed to the first viewing surface. The display medium can be a reflective, electro-phoretic medium for displaying monochrome and/or colour images. The display device can be equipped with means (37a, 37b) for interchanging the first and second viewing surfaces, or it can be flexible with means (42) for collapsing and extending the display structure. The invention further relates to a method for manufacturing such a display structure.
Abstract:
A device (B) is described for driving a bistable display (A). The device includes a processor (150) for receiving an input signal indicative for a desired luminance of said at least one pixel. The device also includes a controller (100) for determining a sequence of voltage levels to achieve a transition from a present luminance to the desired luminance. The device further includes a voltage generator (108) for generating the sequence of voltage levels.A portion of the sequence is selected from a plurality of mutually different sequence portions, to achieve mutually different luminance transitions. At least a first and a second of this plurality of sequence portions mutually have a same set of voltage levels and have the voltage levels from that set occurring the same number of times, but have the voltage levels in that set occur in a mutually different order.
Abstract:
During a scan line driving phase, a column driver is controlled to provide a plurality of driving column voltages to the source terminals and the row driver is controlled to provide scanning row selection voltages to the gate terminals for sequentially updating the each pixel having an initial pixel state, voltages with said plurality of driving column voltages to attain, for each initial pixel state (600), an initial common pixel state (608). During a common driving phase the column driver is controlled to provide a uniform column voltage to the source terminals. This voltage is used for updating the plurality of pixel voltages with a uniform column voltage. In addition, the row driver is controlled to provide row select voltages with a gate swing that is lower during the common driving phase than during the row driving phase so as to drive the pixels from a respective the initial common state to a respective final common state. The pixel states may differ from each other at least during a part of the common driving phase or even during the entire common driving phase, so that initial and final common states and intermediate states may differ from pixel to pixel.
Abstract:
The invention relates to a display structure comprising an electrode layer (3) superposed on a sub-layer (5) wherein a surface of the sub-layer facing the electrode layer is roughened. In particular, the display structure may relate to a TFT stack comprising a layer of an electrode metal corresponding to a pixel electrode (3). The pixel pad together with the data line (1) is used for charging of the pixel pad. The gate electrode (4) used is separated from the source and drain electrode (1, 3) by a dielectric layer (6). The structural layers of the TFT may be deposited on a suitable flexible substrate (7). In order to prevent defects in the light modulating layer (9) from being visible, a surface of the sub-layer (5) underlying the electrode layer (3) is roughened. It is desirable to provide such improvement to, among others, electrophoretic-type displays and liquid crystal-type displays.
Abstract:
A stacked display (20b) comprises superposed regions for changing between a reflective color state (R, G, B) and a transparent state, which regions form part of a~bended substrate (20). The substrate (20) may comprise a sequence of portions (1 -6) which forms regions having pre-defined color. Each portion (1-6) is electrically connected to a further portion in the sequence by interconnect regions (b', c', d') which form an oversized loop between the regions (1-2, 3-4, 5-6) when the substrate (20) is bent. The regions (1-2, 3-4, 5-6) are filled with a suitable optoelectronic color material (R, G, B).
Abstract:
The invention relates to display structure (10) comprising a display medium (6) having a first viewing surface (VI), wherein for the same display medium the display structure is provided with a second viewing surface (V2) opposed to the first viewing surface. The display medium can be a reflective, electro-phoretic medium for displaying monochrome and/or colour images. The display device can be equipped with means (37a, 37b) for interchanging the first and second viewing surfaces, or it can be flexible with means (42) for collapsing and extending the display structure. The invention further relates to a method for manufacturing such a display structure.
Abstract:
A display device (500) is disclosed with a plurality of pixels (555), each having a pixel state (P) that is driven by a driving voltage differential (V EP ) between a pixel voltage (Vpx) applied to a pixel terminal (101) of the pixel and a common voltage (V CE ) applied to a common terminal (102) of the pixel. In a first pixel driving state, wherein pixels are driven to a first colour, a common voltage is provided to the common terminals (102) with a first polarity. In a second pixel driving state, wherein pixels are driven to a second colour, a common voltage is provided to the common terminals (102) with a second polarity opposite to the first polarity. An absolute value of the common voltage (V CE ) in the first and second pixel driving state is higher than a maximum absolute value of the column voltage (V col ) in the corresponding pixel driving state.
Abstract:
A lookup table is provided for storing voltage waveforms for transitions between a plurality of discrete pixel states forming a set that can be ordered in consecutive states according to a reflectivity of the pixel. An image controller is programmed to execute, in a consecutive drive phase, repeatedly the steps of retrieving an initial state and update state, matching, when the initial and update states are different, in the ordered set of pixel states of the lookup table, a consecutive state and a corresponding consecutive waveform, the consecutive state forming a path, according to the consecutive drive phase, from the initial state to the update state in the set of pixel states, storing the consecutive state in the memory as new initial state; and controlling a voltage driver to drive the pixel from the initial state to the consecutive state using said consecutive waveform.