公开(公告)号：EP0571215B1

公开(公告)日：1998-07-15

申请号：EP93303946.3

申请日：1993-05-20

申请人： SHARP KABUSHIKI KAISHA

发明人： Tagawa, Takao ,  Inazu, Shinsuke ,  Okamura, Kazunari

IPC分类号： G06K11/16

CPC分类号： G06F3/0412

公开(公告)号：EP0843278A3

公开(公告)日：1998-08-26

申请号：EP98100532.5

申请日：1993-05-21

申请人： SHARP KABUSHIKI KAISHA

发明人： Tagawa, Takao ,  Takahama, Kengo ,  Okamura, Kazunari ,  Kako, Noritoshi

IPC分类号： G06K11/16

CPC分类号： G06F3/0412

摘要： A detection and hold circuit (24) outputs a reference signal having a level proportional to an x-coordinate detection pulse input from an X-coordinate signal amplifier (23). A delay element (25) delays the reference signal. An adder (26) adds the x-coordinate detection pulse from the X-coordinate signal amplifier (23) and a delayed signal from the delay element (25). Comparators (27) and (30) obtain a coordinate detection pulse making a detection signal from another detection and hold circuit (33) for an LCD voltage inversion pulse serve as a reference signal. Thus noise following the x-coordinate detection pulse is removed to generate a coordinate detection pulse with a reference value corresponding to the level of the LCD voltage inversion pulse to allow a stable coordinate detection to be achieved. A correction signal generation circuit (4) reads out correction data stored in an internal memory and transmits the data as a correction signal to a correction voltage generation circuit (5) in an x-coordinate detection period when the segment electrode (X) placed in the lower position is scanned. The correction voltage generation circuit (5) generates a correction voltage (V 1 ') for canceling a voltage induced at the common electrode (Y) placed in the upper position based on the input correction signal and a bias power source (V 1 ) input from a DC power supply circuit (6).

摘要翻译： 检测和保持电路（24）输出具有与从X坐标信号放大器（23）输入的x坐标检测脉冲成比例的电平的基准信号。 延迟元件（25）延迟参考信号。 加法器（26）将来自X坐标信号放大器（23）的x坐标检测脉冲和来自延迟元件（25）的延迟信号相加。 比较器（27）和（30）获得使来自用于LCD电压反转脉冲的另一个检测和保持电路（33）的检测信号作为参考信号的坐标检测脉冲。 因此，除去x坐标检测脉冲之后的噪声被去除以产生具有与LCD电压反转脉冲的电平对应的参考值的坐标检测脉冲，以实现稳定的坐标检测。 校正信号生成电路（4）读出存储在内部存储器中的校正数据，并且当放置在分段电极（X）中时在x坐标检测时段中将该数据作为校正信号发送到校正电压生成电路（5） 扫描较低的位置。 校正电压生成电路（5）基于输入的校正信号和从第一输入端输入的偏置电源（V1），生成校正电压（V1'），用于抵消在位于较高位置的公共电极（Y）感应的电压 直流电源电路（6）。

公开(公告)号：EP0843278A2

公开(公告)日：1998-05-20

申请号：EP98100532.5

申请日：1993-05-21

申请人： SHARP KABUSHIKI KAISHA

发明人： Tagawa, Takao ,  Takahama, Kengo ,  Okamura, Kazunari ,  Kako, Noritoshi

IPC分类号： G06K11/16

CPC分类号： G06F3/0412

摘要： A detection and hold circuit (24) outputs a reference signal having a level proportional to an x-coordinate detection pulse input from an X-coordinate signal amplifier (23). A delay element (25) delays the reference signal. An adder (26) adds the x-coordinate detection pulse from the X-coordinate signal amplifier (23) and a delayed signal from the delay element (25). Comparators (27) and (30) obtain a coordinate detection pulse making a detection signal from another detection and hold circuit (33) for an LCD voltage inversion pulse serve as a reference signal. Thus noise following the x-coordinate detection pulse is removed to generate a coordinate detection pulse with a reference value corresponding to the level of the LCD voltage inversion pulse to allow a stable coordinate detection to be achieved. A correction signal generation circuit (4) reads out correction data stored in an internal memory and transmits the data as a correction signal to a correction voltage generation circuit (5) in an x-coordinate detection period when the segment electrode (X) placed in the lower position is scanned. The correction voltage generation circuit (5) generates a correction voltage (V 1 ') for canceling a voltage induced at the common electrode (Y) placed in the upper position based on the input correction signal and a bias power source (V 1 ) input from a DC power supply circuit (6).

摘要翻译： 检测和保持电路（24）输出具有与从X坐标信号放大器（23）输入的x坐标检测脉冲成比例的电平的参考信号。 延迟元件（25）延迟参考信号。 加法器（26）将来自X坐标信号放大器（23）的x坐标检测脉冲和来自延迟元件（25）的延迟信号相加。 比较器（27）和（30）获得坐标检测脉冲，从LCD电压反转脉冲的另一个检测和保持电路（33）起作为参考信号的检测信号。 因此，除去x坐标检测脉冲之后的噪声，以产生具有与LCD电压反转脉冲的电平相对应的参考值的坐标检测脉冲，以实现稳定的坐标检测。 校正信号生成电路（4）读出存储在内部存储器中的校正数据，并且，当分割电极（X）放置在X坐标检测周期中时，将数据作为校正信号发送到校正电压生成电路（5） 扫描较低的位置。 校正电压产生电路（5）根据输入的校正信号和偏置电源（V1）产生用于消除在上位置的公共电极（Y）感应的电压的校正电压（V1'）， 直流电源电路（6）。

公开(公告)号：EP0843278B1

公开(公告)日：2002-10-23

申请号：EP98100532.5

申请日：1993-05-21

申请人： SHARP KABUSHIKI KAISHA

发明人： Tagawa, Takao ,  Takahama, Kengo ,  Okamura, Kazunari ,  Kako, Noritoshi

IPC分类号： G06K11/16

CPC分类号： G06F3/0412

公开(公告)号：EP0571215A1

公开(公告)日：1993-11-24

申请号：EP93303946.3

申请日：1993-05-20

申请人： SHARP KABUSHIKI KAISHA

发明人： Tagawa, Takao ,  Inazu, Shinsuke ,  Okamura, Kazunari

IPC分类号： G06K11/16

CPC分类号： G06F3/0412

摘要： A display-integrated tablet apparatus of electrostatic induction type having a liquid crystal panel (11) shields a radiofrequency field generated from a backlight source for the liquid crystal panel such as a fluorescent lamp (40) and a backlight drive mechanism. A coating (54) of nickel, copper, or other metal is provided on the surface of a lamp holder (52) for the fluorescent lamp (40) provided at the periphery of the liquid crystal panel (11), and the metallic coating (54) is grounded, effectively shielding the radiofrequency field emitted from the fluorescent lamp (40) towards an input panel (34) of the tablet. As a result, an induction voltage, which would be caused by the radiofrequency field, is prevented from being induced to a detection pen (18) placed at the input panel (34) of the tablet, and coordinate detection errors are prevented.
Alternatively, the lamp may be switched off during coordinate detection periods or the lamp drive frequency may be chosen such that harmonics lie outside the range of frequencies responded to by the coordinate detection circuit.

摘要翻译： 具有液晶面板（11）静电感应型的显示一体型输入板装置从屏蔽用于液晶面板的背光源所产生的射频场：如荧光灯（40）和背光源驱动机构。 镍，铜，或其它金属的涂层（54）提供了一种灯座（52），用于在液晶面板（11）的周围设置的荧光灯（40）的表面和金属涂层（上 54）被接地，有效屏蔽朝从荧光灯（40发射的射频场）在片剂的输入面板（34）。 其结果，在感应电压，这将通过射频场引起的，从被诱导以在片剂的输入面板（34）放置在检测笔（18）阻止，并且坐标检测误差防止。 备选地，灯可以在坐标检测期间或灯驱动频率可被选择的搜索没有谐波位于外的频率范围由所述坐标检测电路回覆被关断。