Electro static discharge protection for processing active matrix liquid crystal displays
AssigneeHoneywell Inc.
InventorSonia R. Dodd
Life of this patent
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AssigneeHoneywell Inc.
InventorSonia R. Dodd
Estimating the term…
An improved method for providing extended electro static discharge protection of an active matrix liquid crystal display, at the external lead contact areas by using a shorting conductor or bar to short out all row and column contacts or leads on the display, and to protect the electronics during active matrix processing, fabrication, polarizer attachment, and connecting of display leads. The display connection leads and the shorting bar on those leads, are on the front side of the active glass layer of the display. A saw is used to provide an accurate and relatively deep cut on the back side of the active glass layer thereby forming a border within the perimeter of the shorting bar on the front side of the active glass layer. The cut on the back side does not go through the active glass layer but stops several mils from the front side of the active glass layer. This method allows the shorting bar to remain intact with the display's external leads through all of the processing steps, including polarizer installation and the flex connector/driver connection, at least until active matrix liquid crystal display testing is ready to commence. After the polarizers are attached and external connections to the display contacts are made, the edge or border of the active glass layer, incorporating the shorting bar, is broken off at the cut.
A method for removing a shorting conductor situated on lead contacts of a liquid crystal display, the shorting conductor shorting the lead contacts to prevent electrostatic discharge among the lead contacts to the display, the display having first and second planes, each of the first and second planes having approximately parallel first and second surfaces, having a perimeter and having a central area, wherein the lead contacts are situated on the first surface of the first plane of the display, the lead contacts extend from the central area of the first plane toward the perimeter of the first plane, and the lead contacts are for external connections to the display, said method comprising:
A method for removing a shorting conductor connected on lead contacts of a liquid crystal display, the shorting conductor interconnecting the lead contacts to prevent voltage potentials among the lead contacts to the display, the display having first and second layers, each of the first and second layers having approximately parallel first and second surfaces, each surface having a perimeter and having a central area, wherein the lead contacts are situated on the first surface of the first layer of the display, the lead contacts extend from the central area of the first layer toward the perimeter of the first layer, and the lead contacts are for external connections to the display, said method comprising:
A method for removing a shorting conductor which interconnects leads of a liquid crystal display, the shorting conductor and the leads situated on a first surface of a display layer, the display layer having a second surface approximately parallel to the first surface, said method comprising:
A liquid crystal display comprising:
Dependencies are inferred from the claim text.