发明名称 |
DISPLAY DEVICE PROVIDED WITH COORDINATE INPUT MECHANISM |
摘要 |
<p>PURPOSE:To efficiently detect an X coordinate by applying voltage pulses to X electrodes in a specific pattern and successively converging a position area in contact with a detector. CONSTITUTION:During a vertical blanking interval coordinate detection circuit 111 supplies data for applying voltages to the X electrodes x0 to xm-1 in the different patterns for respective line periods through a selector 112 to an X electrode driving circuit 103. That is, the X electrodes x0 to xm-1 are successively equalized into line period number multiples 2 and the voltage is applied to the X electrode of the area on a very right side and the X electrodes of every other present area from the area. For instance, the detection voltage of a pen 104 in contact with the X electrode x2 becomes a voltage level higher for the voltage applying pulse of an (N-1)-th line period (m=2N) and detection data become '1'. By making the detection data and bit data successively correspond to each other in the coordinate detection circuit 111, it is detected that the X coordinate is 2.</p> |
申请公布号 |
JPH07134632(A) |
申请公布日期 |
1995.05.23 |
申请号 |
JP19940199714 |
申请日期 |
1994.08.24 |
申请人 |
HITACHI LTD;HITACHI GAZO JOHO SYST:KK |
发明人 |
IKEDA MAKIKO;FURUHASHI TSUTOMU;MANO HIROYUKI;NISHITANI SHIGEYUKI;TAKITA ISAO;TSUNEKAWA SATORU;HAMADA TATSUZO;KITAJIMA MASAAKI;SUZUKI TETSUYA |
分类号 |
G06F3/041;G06F3/033;(IPC1-7):G06F3/033 |
主分类号 |
G06F3/041 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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