Wide Viewing Angle Transflective Liquid Crystal Displays
First Claim
1. A transflective liquid crystal display device comprising:
- a plurality of pixel circuits sandwiched between a first substrate and a second substrate, each pixel circuit comprising;
a reflective region comprising a first portion of a liquid crystal layer and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization;
a transmissive region comprising a second portion of the liquid crystal layer;
at least one transparent common electrode formed on the inner surface of one of the first and second substrate; and
at least one transparent pixel electrode formed on an outer surface of the same substrate as the common electrode, the at least one common electrode and at least one pixel electrode insulated by a passivation layer therebetween;
the liquid crystal molecules in the reflective and transmissive regions are substantially aligned along a direction parallel to the first and second substrate when no voltage is applied to the at least one common and at least one pixel electrodes, and horizontal electric fields that are substantially parallel to the first and second substrate are generated in the liquid crystal layer to rotate liquid crystal molecules substantially in a plane parallel to the first and second substrate, when a high voltage is applied to the pixel electrode.
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Abstract
Apparatus, methods and systems for a transmissive liquid crystal display including a plurality of pixel circuits, each pixel circuit including a reflective region and a transmissive region. The reflective region includes a polarization dependent reflector for reflecting ambient light. The reflective and transmissive regions include an initially homogeneously aligned liquid crystal layer sandwiched between a first and a second substrate. Each pixel further includes at lease one first transparent electrode as the common electrode and at least one second transparent electrode as the pixel electrode both formed on one of the same first and second substrates, wherein substantial fringe fields with rich horizontal electric fields are generated in the liquid crystal layer when voltage is applied to the pixel electrode, making the liquid crystal molecules rotate mainly in the horizontal direction to achieve wide viewing angle.
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Citations
23 Claims
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1. A transflective liquid crystal display device comprising:
a plurality of pixel circuits sandwiched between a first substrate and a second substrate, each pixel circuit comprising; a reflective region comprising a first portion of a liquid crystal layer and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization; a transmissive region comprising a second portion of the liquid crystal layer; at least one transparent common electrode formed on the inner surface of one of the first and second substrate; and at least one transparent pixel electrode formed on an outer surface of the same substrate as the common electrode, the at least one common electrode and at least one pixel electrode insulated by a passivation layer therebetween;
the liquid crystal molecules in the reflective and transmissive regions are substantially aligned along a direction parallel to the first and second substrate when no voltage is applied to the at least one common and at least one pixel electrodes, and horizontal electric fields that are substantially parallel to the first and second substrate are generated in the liquid crystal layer to rotate liquid crystal molecules substantially in a plane parallel to the first and second substrate, when a high voltage is applied to the pixel electrode.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for fabricating each pixel region of a transmissive liquid crystal display comprising the steps of:
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forming a polarization dependent reflector in a first region of a first substrate, the first region corresponding to a reflective region of a pixel of the transmissive liquid crystal display; forming a thin-film-transistor in the same pixel region of a display on one of the first substrate and a second substrate; forming a gate line connected with a gate of the thin-film-transistor; forming a data line connected with one of a drain and a source end of the thin-film-transistor; forming a first counter plane electrode on one of the first and second substrate; forming a passivation layer covering the first counter plane electrode; forming a second electrode with at least one of straight, curved, and piecewise linear shaped electrode strips on the passivation layer on the same substrate with the first electrode; connecting the first electrode to a first reference voltage; connecting the second electrode to the other end of the thin-film-transistor as to the data line; and sandwiching a liquid crystal layer between an interior surface of the first and second substrates; - View Dependent Claims (22, 23)
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Specification