Liquid crystal display device for both inputting and outputting information
First Claim
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1. A system for introducing and displaying information comprising:
- a flat panel matrix display unit having a plurality of pixels arranged in a matrix, each of said pixels associated with one of a plurality of common row electrodes, N;
input means for introducing the information into the system;
said input means including a plurality of information receiving elements each corresponding to an individual pixel of said flat panel matrix display;
said input means detecting a portion of said flat panel matrix display unit being inputted upon;
common drive means, responsive to said input means, for sequentially scanning said common row electrodes of said matrix display unit with scan voltage pulses;
said common row electrodes being divided into K common row electrode groups each having N/K common row electrodes and defining a display portion,said common drive means sequentially scanning said common row electrodes of at least one of said common row electrode groups to display the information introduced by said input means thereon;
said common drive means driving said common row electrodes of said portion detected by said input means with a common electrode scan voltage pulse which has a higher duty cycle than the duty cycle 1/N needed to scan all N common row electrodes to improve contrast of the displayed information, thereby operating the system in a partial display mode; and
said common drive means driving said common row electrodes with a common electrode scan voltage pulse which has a duty cycle of 1/N when the system is operable in a fully display mode.
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Abstract
The disclosed is an input and liquid crystal display unit including a flat liquid crystal display unit allowing input of data by manual writing having a plurality of partial display areas which are divisible into multiple units. The display unit overlays a magnetic tablet for inputting the designated data into the unit for display on the partial display areas. The display is driven to only some of said partial display areas to display the input pattern in the information on the partial display areas by applying a high duty cycle scan voltage to the common electrodes of the partial display areas.
31 Citations
10 Claims
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1. A system for introducing and displaying information comprising:
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a flat panel matrix display unit having a plurality of pixels arranged in a matrix, each of said pixels associated with one of a plurality of common row electrodes, N; input means for introducing the information into the system; said input means including a plurality of information receiving elements each corresponding to an individual pixel of said flat panel matrix display; said input means detecting a portion of said flat panel matrix display unit being inputted upon; common drive means, responsive to said input means, for sequentially scanning said common row electrodes of said matrix display unit with scan voltage pulses; said common row electrodes being divided into K common row electrode groups each having N/K common row electrodes and defining a display portion, said common drive means sequentially scanning said common row electrodes of at least one of said common row electrode groups to display the information introduced by said input means thereon; said common drive means driving said common row electrodes of said portion detected by said input means with a common electrode scan voltage pulse which has a higher duty cycle than the duty cycle 1/N needed to scan all N common row electrodes to improve contrast of the displayed information, thereby operating the system in a partial display mode; and said common drive means driving said common row electrodes with a common electrode scan voltage pulse which has a duty cycle of 1/N when the system is operable in a fully display mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification