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US 2014/0152933 A1Published application
Resistor Meshes for Display Heating
AssigneeKopin Corporation
InventorsChompoonoot Anupongongarch, Frederick P. Herrmann, Wen-Foo Chern
Life of this patent
Estimating the term…
Abstract
An improved Liquid Crystal Display (LCD) heating system is provided. Resistor meshes, in particular VCOM resistor heating meshes, in the pixel array improve capacity of the display heater (heating system) so that the display is heated faster from low temperatures. The resistor mesh design provides much lower resistance from one point in the pixel array to an edge than pixel-to-pixel horizontal VCOM resistance, thus reducing horizontal crosstalk. Further, the approach permits the display to be active during the warm-up process.
Claims16
A display apparatus comprising:
- a two dimensional array of display elements disposed on a common semiconductor substrate, each display element comprising at least a pixel transistor, a storage capacitor (Cst) and a pixel electrode,
- each transistor being arranged to control an operation state of the pixel, and having at least a gate, a drain, and a source terminal, the drain being coupled to a first plate of the storage capacitor;
- a plurality of row select lines distributed to control a first plurality of gate terminals;
- a plurality of column lines distributed to pass video voltages to the pixel electrode through the pixel transistor;
- a resistor heating mesh including a plurality of horizontal common voltage lines and a plurality of vertical common voltage lines;
- each horizontal common voltage line being arranged in an orientation parallel to the row select lines and independent of both the row select and column lines, and being coupled to and integral with two or more display elements at least at a second plate of the storage capacitor in each display element, each horizontal common voltage line further including two horizontal terminals providing a first horizontal node and a second horizontal node;
- and
- each vertical common voltage line being arranged in an orientation parallel to the column lines and independent of both the row select and column lines, and being coupled to the horizontal common voltage line to form a mesh, each vertical common voltage line further including two vertical terminals providing a first vertical line node and a second vertical line node;
- and
- a heater driver coupled to at least one first and second vertical line node and arranged to supply at least a first and second vertical common line voltage to the at least one first and second vertical line node, respectively, the first vertical common line voltage supplied at the first vertical node and the second vertical common line voltage supplied at the second vertical node producing a vertical common line voltage difference and a vertical common line current flowing through the vertical common voltage line, and thereby heating the display elements coupled thereto.
7 more elements
A method of heating a display comprising:
- disposing a two dimensional array of display elements on a common semiconductor substrate, each display element comprising at least a pixel transistor, a storage capacitor (CST) and a pixel electrode,
- each transistor being arranged to control an operation state of the pixel, and having at least a gate, a drain, and a source terminal, the drain being coupled to a first plate of the storage capacitor;
- having a plurality of row select lines distributed to control a first plurality of gate terminals;
- having a plurality of column lines distributed to pass video voltages to the pixel electrode through the pixel transistor;
- providing a resistor heating mesh including a plurality of horizontal common voltage lines and a plurality of vertical common voltage lines;
- each horizontal common voltage line being arranged in an orientation parallel to the row select lines and independent of both the row select and column lines, and being coupled to and integral with two or more display elements at least at a second plate of the storage capacitor in each display element, each horizontal common voltage line further including two horizontal terminals providing a first horizontal node and a second horizontal node;
- and
- each vertical common voltage line being arranged in an orientation parallel to the column lines and independent of both the row select and column lines, and being coupled to the horizontal common voltage line to form a mesh, each vertical common voltage line further including two vertical terminals providing a first vertical line node and a second vertical line node;
- and
- coupling a heater driver to at least one first and second vertical line node and arranged to supply at least a first and second vertical common line voltage to the at least one first and second vertical line node, respectively, the first vertical common line voltage supplied at the first vertical node and the second vertical common line voltage supplied at the second vertical node producing a vertical common line voltage difference and a vertical common line current flowing through the vertical common voltage line, and thereby heating the display elements coupled thereto.
7 more elements
Dependencies are inferred from the claim text.