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Liquid Crystal Display Device Configuration

IP.com Disclosure Number: IPCOM000077295D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Gladstone, GL: AUTHOR [+2]

Abstract

An improved display device configuration is proposed whose design overcomes several of the difficulties inherent in the current configuration. The configuration of a typical current display device is shown in Figs. 1 and 2. In this device, in the "off" mode voltage is not applied to any of the feeder lines and the appearance of the cell is that of a uniform mirror plane. In the "on" mode, a voltage is applied to one or more of the electrodes through the feeder line or lines. The appearance then changes to one of bright bars due to light scattering at the driver electrodes. In the design of Figs. 1 and 2, the mirror plane is grounded and the voltage applied may be DC or preferably AC, with an amplitude of 5 to 15 volts. Problems with the Current State of the Art:.

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Liquid Crystal Display Device Configuration

An improved display device configuration is proposed whose design overcomes several of the difficulties inherent in the current configuration. The configuration of a typical current display device is shown in Figs. 1 and 2. In this device, in the "off" mode voltage is not applied to any of the feeder lines and the appearance of the cell is that of a uniform mirror plane. In the "on" mode, a voltage is applied to one or more of the electrodes through the feeder line or lines. The appearance then changes to one of bright bars due to light scattering at the driver electrodes. In the design of Figs. 1 and 2, the mirror plane is grounded and the voltage applied may be DC or preferably AC, with an amplitude of 5 to 15 volts. Problems with the Current State of the Art:.

Two major difficulties with the above-outlined scheme are: (1) difficulty of making connection to the driving electronics; and (2) the need for careful masking of the numeric characters to eliminate from view those areas of fluid which are directly beneath the feeder lines and exhibit strong light scattering. Improved Device Configuration:.

The difficulties of the prior design identified above are overcome by utilizing the configuration shown in Figs. 3A and 3B. The upper transparent electrode is grounded. The lower electrode consists of mirror electrode segments which exit through the rear of the lower plane. This electrode pattern is separated and insulated f...