摘要:
A touch sensor for a touch display is provided which includes an optical element including at least one electrically conductive layer, the at least one electrically conductive layer being partially reflective and partially transmissive with respect to incident light; and sensing circuitry electrically coupled to the at least one electrically conductive layer to determine positioning of a finger, hand or other type of pointing device relative to the optical element.
摘要:
A broadband optical retardation device, such as may be used for polarisation encoding of display information or in diffractive optical systems, includes a patterned uniform half wave plate retarder in combination with a non-patterned uniform quarter wave plate retarder having an optic axis oriented at 90° to the xz plane. The patterned retarder consists of alternating first and second regions having first and second optic axes at different orientations to a reference axis, for example at +22.5° and −22.5° to the xz plane. Considering light of wavelength &lgr;° incident on the retarder and linearly polarised in the xy plane, such light is differently polarised by the regions, and the light output by the device includes regions in which the light is right circularly polarised and regions in which the light is left circularly polarised. In the case of incident light of wavelengths greater or less than &lgr;°, the output light becomes progressively more linearly polarised as the wavelengths departs to a greater extent from the ideal value, but not to the same extent as would be the case if the device consisted simply of a patterned single layer acting as a quarter plate retarder.
摘要:
A method of making a patterned retarder of the present invention includes the steps of providing an alignment layer rubbing the alignment layer in a first rubbing direction, masking with a mask at least one first region of the alignment layer, to reveal at least one second region of the alignment layer, rubbing the at least one second region through the mask in a second rubbing direction different from the first rubbing direction, removing the mask, disposing on the alignment layer a layer of birefringent material whose optic axis is aligned by the alignment layer, and fixing the optic axis of the birefringent layer.
摘要:
A switched capacitor digital/analog converter is provided for performing non-linear conversion. An input receives an n bit digital word for conversion. The individual bits of the input word control electronic switches which switch the plates of n capacitors between upper and lower reference voltages. The capacitors have values C0, . . . Cn−1 such that Cx
摘要:
A display device and method driving a display device makes use of the dynamic variation in the brightness of a surface mode liquid crystal device cell having a liquid crystal layer with a non-zero twist angle. The liquid crystal layer is switched before the equilibrium value of the brightness has been reached, so as to make use of the non-equilibrium increased brightness and so increase the brightness of the display.
摘要:
An imaging system according to the invention includes: a matrix of light modulating elements including first and second elements for respectively transmitting first and second image components; a polarizing element having a first polarization axis for linearly polarizing light from the first and second elements; a first optical retardation element incorporating at least one first retarder having first and second regions respectively having a first optic axis at a first orientation and a second option axis at a second orientation to the first polarization axis; and a detecting element having first and second detecting parts, each detecting part including respective second optical retardation element incorporating at least one second retarder and an analyzing element having a second polarization axis intended to be disposed at a defined orientation relative to the first polarization axis, at least one second retarder of the first detecting part having an optic axis which is intended to be disposed substantially perpendicularly to the first optic axis and transversely to the second optic axis of the at least one first retarder, and at least one second retarder of the second detecting part having an optic axis which is intended to be disposed substantially perpendicularly to the second optic axis and transversely to the first optic axis of the at least one first retarder. Substantially only light relating to the first image component is transmitted by the first detecting part and substantially only light relating to the second image component is transmitted by the second detecting part.
摘要:
A ferroelectric liquid crystal device includes a layer of ferroelectric liquid crystal material contained between a pair of substrates, a first plurality of electrodes and a second plurality of electrodes defining a plurality of addressable liquid crystal pixels. A driving arrangement is provided for applying a first signal (Strobe) in succession to the first plurality of electrodes and for applying a plurality of second signals (Data) simultaneously to the second plurality of electrodes. The plurality of second signals are arranged to include non-rectangular wave signals which have a lower harmonic content than a rectangular wave. Non-uniform heating of the device as a result of the application of the second signals (Data) is reduced with consequent improvement in device performance.
摘要:
An addressable matrix display comprises an addressable matrix of pixels, a first set of electrode tracks on one side of the matrix and a second set of electrode tracks on the other side of the matrix. The sets of electrode tracks cross one another at the locations of the pixels, and the pixels are switchable by the application of respective switching waveforms to the electrode tracks. Furthermore at least one of the electrode tracks has a resistance which varies along the length of the electrode track in order to provide increased temperature uniformity over the display due to power dissipation during switching by the switching waveforms applied to the electrode tracks. More particularly the resistance in an intermediate section of the electrode track is greater than the resistance in two end sections of the electrode track.
摘要:
A display comprises a parallax optic (2), such as a combined parallax barrier and lens array, and a pixellated display device (1). The pixels of the display device (1) are arranged as groups cooperating with a parallax element (4) of the parallax optic (2). Each group comprises a first pixel (A) aligned with the centre of the parallax element (4), second and third pixels (B, C) on either side of the first pixel (A), and fourth pixels (D) shared with adjacent groups and disposed outside the second pixels (B, C). The parallax elements (4) make the different pixels of each group visible in different viewing regions. A control arrangement selects regions of the display and selects different combinations of the pixels of each group for image display within respective regions so as to provide simultaneously-present different viewing modes having different viewing range characteristics.
摘要:
A display device is provided, including a signal transmission mechanism that makes it possible to reduce the number of pins on an FPC board connected to a TFT substrate or eliminate the necessity for the FPC board, and that can be readily applied to a compact device.The present liquid crystal display device includes light detectors, a receiver circuit, a display control circuit, a video signal line drive circuit, a scanning signal line drive circuit, and a display portion, which are formed on a TFT substrate of a liquid crystal display panel, and it also includes white LEDs, and an LED drive circuit, which are included in a backlight portion. The LED drive circuit drives the white LEDs, each emitting a light (modulation) signal LS in accordance with an externally-provided video signal VS. The receiver circuit generates (demodulates) the video signal VS based on a signal received via the light detector. Such an optical transmission mechanism makes it possible to reduce the number of pins on the FPC board or eliminate the FPC board.