# US 2014/0152933 A1 · Resistor Meshes for Display Heating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152933 A1 - Document ID: US20140152933A1 - Status: Published application - Kind: A1 - Application number: 14/080,497 - Filed: 2013-11-14 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Kopin Corporation - Applicants: Kopin Corporation - Inventors: Chompoonoot Anupongongarch; Frederick P. Herrmann; Wen-Foo Chern - Web page: https://patentgrep.com/patent/US20140152933A1 ## CPC - G02F 1/133382: {Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell} - G02F 1/136213: {Storage capacitors associated with the pixel electrode} - G02F 1/136286: {Wiring, e.g. gate line, drain line} - G02F 2202/104: poly-Si - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 2300/0426: Layout of electrodes and connections - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The display apparatus of claim 1, wherein the heater driver further controls a source voltage applied to a terminal of the resistor heating mesh, independently of voltages applied to control the row select and column lines, enabling heat to be applied directly to the display element while the display element is actively operating to display information. ### Claim 3 (depends on 1) The display apparatus of claim 1, wherein the heater driver is further coupled to at least one first and second horizontal line node and arranged to supply at least a first and second horizontal common line voltage to the at least one first and second horizontal node, respectively, the first horizontal common line voltage supplied at the first horizontal node and the second horizontal common line voltage supplied at the second horizontal node producing a horizontal voltage difference and a current flowing through the horizontal common voltage line, and thereby heating the display elements couple thereto. ### Claim 4 (depends on 1) The display apparatus of claim 1, wherein the heater driver further includes a voltage divider arranged to supply voltage continuity between the at least one first vertical line node and the first horizontal line node. ### Claim 5 (depends on 1) The display apparatus of claim 1, wherein the horizontal and vertical common voltage lines of the resistor heating mesh are formed of polysilicon. ### Claim 6 (depends on 1) The display apparatus of claim 1, wherein the vertical common voltage lines are metal-strapped vertical common voltage lines and the horizontal common voltage lines are formed of polysilicon. ### Claim 7 (depends on 1) The display apparatus of claim 1, wherein the horizontal common voltage lines are metal-strapped horizontal common voltage lines and the vertical common voltage lines are formed of polysilicon. ### Claim 8 (depends on 1) The display apparatus of claim 1, wherein the row select lines are metal row lines. ### Claim 9 (depends on 1) The display apparatus of claim 1, wherein the resistor heating mesh reduces horizontal crosstalk and provides a resistance level from one point in the array of display elements to an edge of the array that is much less than a corresponding resistance level from one corresponding point in horizontal-only common heater line array of display elements to an edge of the horizontal-only common heater line array. ### Claim 10 (depends on 1) The display apparatus of claim 1, wherein the resistor heating mesh is disposed adjacent to each of the transistor and pixel electrode in each display element. ### Claim 11 (depends on 1) The display apparatus of claim 1, wherein each horizontal and vertical common voltage line is located in a plane beneath an active layer of the pixel elements. ### Claim 12 (depends on 1) The display apparatus of claim 1, wherein the display elements are used in at least one of: a digital camera, digital Single Lens Reflex (SLR) camera, night vision display, handheld video game display, mobile telephone, or video eyewear device. ### Claim 13 (depends on 1) The display apparatus of claim 1, wherein at least one of the row select line or column line is controlled by a low power shift register. ### Claim 14 (depends on 13) The display apparatus of claim 13, wherein the low power shift register includes a stage circuit, the stage circuit including a single voltage node driven by a single transistor. ### Claim 15 (depends on 1) The display apparatus of claim 1, further including an active pixel electrode layer disposed between the resistor heating mesh and liquid crystal material layer. ### Claim 16 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.