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1. 发明授权

US07176869B2 Drive circuit for use in liquid crystal display, liquid crystal display incorporating the same, and electronics incorporating the liquid crystal display 有权
标题翻译：用于液晶显示器的驱动电路，并入液晶显示器的液晶显示器以及结合了液晶显示器的电子装置
公开(公告)号：US07176869B2
公开(公告)日：2007-02-13
申请号：US09898185
申请日：2001-07-03
申请人： Kouji Kumada , Toshihiro Yanagi , Takashige Ohta
发明人： Kouji Kumada , Toshihiro Yanagi , Takashige Ohta
IPC分类号： G09G3/36
CPC分类号： G09G3/3655 , G09G3/3688 , G09G3/3696 , G09G2310/027 , G09G2320/0204 , G09G2320/0257
摘要： A drive circuit for use in a liquid crystal display supplies source signals from a source driver to pixel electrodes through switching by means of TFTs according to scan signals from a gate driver, includes a reference voltage generator circuit for adjusting potential differences between the pixel electrodes and a common electrode so as to compensate for the effects of variations in drain voltages caused by parasitic capacity in the TFTs and compensate for irregularities in DC voltage caused by asymmetry in properties between an active matrix substrate and an opposite substrate sandwiching a liquid crystal layer. The reference voltage generator circuit is composed of a reference voltage generator circuit for shifting the voltage levels of the source signals supplied by the source driver equally for all the pixel electrodes. Thus, the drive circuit for use in a liquid crystal display is applicable to portable electronics operative without necessarily performing periodical D/A conversions and includes the reference voltage generator circuit running on a reduced power supply.
摘要翻译：用于液晶显示器的驱动电路通过根据来自栅极驱动器的扫描信号的TFT通过TFT的切换来提供源极驱动器到像素电极的源极信号，该参考电压发生器电路用于调整像素电极和公共电极，以补偿由TFT中的寄生电容引起的漏极电压变化的影响，并且补偿由有源矩阵基板和夹持液晶层的相对基板之间的性质的不对称性引起的直流电压的不规则性。参考电压发生器电路由参考电压发生器电路组成，用于将源极驱动器提供的源极信号的电压电平相等于所有像素电极。因此，用于液晶显示器的驱动电路可应用于便携式电子设备，而不需要执行周期性的D / A转换，并且包括在减小的电源上运行的参考电压发生器电路。

2. 发明授权

US07190357B2 Signal line drive circuit, image display device, and portable apparatus 有权
标题翻译：信号线驱动电路，图像显示装置和便携式装置
公开(公告)号：US07190357B2
公开(公告)日：2007-03-13
申请号：US09925909
申请日：2001-08-09
申请人： Takashige Ohta , Toshihiro Yanagi , Kouji Kumada
发明人： Takashige Ohta , Toshihiro Yanagi , Kouji Kumada
IPC分类号： G09G5/00 , G09G3/36
CPC分类号： G09G3/2011 , G09G3/3688 , G09G3/3696 , G09G2310/027 , G09G2330/021 , G09G2340/0428 , G09G2360/16
摘要： The signal line drive circuit is provided with: a reference voltage chooser circuit for choosing one of incoming voltages in accordance with tones represented by an image signal to output the chosen voltage as a signal line drive signal; and a reference voltage line for directly transmitting first reference voltages VB1 (inclusive of a maximum voltage value VB1max and a minimum voltage value VB1min) supplied by an external reference power supply circuit to the reference voltage chooser circuit. The arrangement eliminates the need to provide a buffer circuit to a reference voltage line over which the first reference voltage is directly transmitted, thereby reducing that electric current which would otherwise flow through the buffer circuit.
摘要翻译：信号线驱动电路具有：基准电压选择电路，用于根据由图像信号表示的音调选择输入电压中的一个，以输出所选择的电压作为信号线驱动信号; 以及用于将由外部参考电源电路提供的第一参考电压VB 1（包括最大电压值VB 1 max和最小电压值VB 1min）直接传输到参考电压选择器电路的参考电压线。该布置消除了对直接传输第一参考电压的参考电压线提供缓冲电路的需要，从而减少否则将流过缓冲电路的电流。

3. 发明授权

US06784863B2 Active matrix liquid crystal display and method of driving the same 有权
标题翻译：有源矩阵液晶显示及其驱动方法
公开(公告)号：US06784863B2
公开(公告)日：2004-08-31
申请号：US09977912
申请日：2001-10-04
申请人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta , Katsuya Mizukata
发明人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta , Katsuya Mizukata
IPC分类号： G09G336
CPC分类号： G09G3/3648 , G09G3/3614 , G09G3/3655 , G09G2320/0223
摘要： An active matrix liquid crystal display drives liquid crystal by writing through TFTs, etc. a source signal from a signal line drive circuit to display electrodes in display cells on a matrix substrate and applying a common signal supplied from a common signal generator to common electrodes on an opposite substrate, the common signal changing in polarity in each frame. After scanning is completed for scan lines corresponding to one frame, a controller controls the interval between scan periods and the cycle of change in polarity of the common signal so as to provide a non-scan period that is longer than the scan period. The provision of the non-scan period extends the duration in which a specified voltage is retained by the display cell. This reduces the effects of variations in retained voltages caused by parasitic capacitance which develops in reflective electrode structures in which the display electrodes partly overlook scan lines and signal lines. Thus, in frame inversion drive, differences in brightness between the top and bottom of the display screen are reduced, and display quality is improved.
摘要翻译：有源矩阵液晶显示器通过TFT等写入来自信号线驱动电路的源极信号来驱动液晶，以在矩阵基板上的显示单元中显示电极，并将公共信号发生器提供的公共信号施加到公共电极上相对的基板，每个帧中的公共信号的极性变化。在对应于一帧的扫描线完成扫描之后，控制器控制扫描周期之间的间隔和公共信号的极性变化周期，以提供比扫描周期长的非扫描周期。提供非扫描周期延长了显示单元保持指定电压的持续时间。这减少了由显示电极部分地忽略扫描线和信号线的反射电极结构中产生的寄生电容引起的保持电压变化的影响。因此，在帧反转驱动中，显示屏幕的顶部和底部之间的亮度差异减小，并且显示质量得到改善。

4. 发明授权

US07126595B2 Image display device using a scanning and hold display mode for power saving purposes 有权
标题翻译：图像显示设备使用扫描和保持显示模式进行省电
公开(公告)号：US07126595B2
公开(公告)日：2006-10-24
申请号：US09924698
申请日：2001-08-08
申请人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta
发明人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta
IPC分类号： G09G5/00 , G09G3/36 , G02F1/1343
CPC分类号： H02M3/073 , G09G3/3611 , G09G3/3696 , G09G2300/08 , G09G2330/02 , G09G2330/021 , G09G2330/022 , G09G2330/023
摘要： Adapting to load currents which differ by more than 100 times between a scanning mode and a hold mode, a frequency of pump operation is decided according to the maximum value of the load currents, and circuit elements of a power supply, for example, such as capacitance of a capacitor for pump operation or a smoothing capacitor, element configurations of switching elements, or capacitance or resistance value of a CR oscillator are set based on this frequency, so that a load current detector lowers the frequency of the pump operation under light load to reduce a self-loss of power in the power supply. This realizes a charge-pump power supply which is installed in a liquid crystal display device of a terminal device of a portable phone, with reduced power consumption under light load and a longer standby time.
摘要翻译：适应于在扫描模式和保持模式之间相差大于100倍的负载电流，根据负载电流的最大值和电源的电路元件决定泵运行频率，例如基于该频率设置用于泵运行的电容器的电容或平滑电容器，开关元件的元件配置或CR振荡器的电容或电阻值，使得负载电流检测器降低在轻负载下的泵操作的频率以减少电源中的电力自身损耗。这实现了安装在便携式电话的终端装置的液晶显示装置中的电荷泵电源，其在轻负载下的功耗降低和待机时间更长。

5. 发明授权

US07002541B2 Active matrix type display and a driving method thereof 有权
公开(公告)号：US07002541B2
公开(公告)日：2006-02-21
申请号：US09974297
申请日：2001-10-04
申请人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta , Katsuya Mizukata
发明人： Toshihiro Yanagi , Kouji Kumada , Takashige Ohta , Katsuya Mizukata
IPC分类号： G09G3/36
CPC分类号： G09G3/3655 , G09G3/3614 , G09G3/3648 , G09G3/3688 , G09G2320/0204 , G09G2320/0247 , G09G2330/021
摘要： In an active matrix type display device, a signal voltage is applied from a signal line driving circuit via an active element such as a TFT to display electrodes on a matrix substrate, and a common voltage is applied to a counter electrode on a facing substrate so that the common voltage is shared by respective display cells. A level of the common voltage is switched in every refresh period of a different length. Thus, it is possible to appropriately set a value of the common voltage which is a reference for specifying an effective voltage of positive polarity and an effective voltage of negative polarity according to the refresh periods. As a result, even when the refresh periods of a different length exist in a mixed manner, it is possible to equalize the effective voltage of positive polarity and the effective voltage of negative polarity so as to suppress an occurrence of a flicker.

6. 发明申请

US20080246721A1 Method of driving image display, driving device for image display, and image display 失效
标题翻译：驱动图像显示的方法，用于图像显示的驱动装置和图像显示
公开(公告)号：US20080246721A1
公开(公告)日：2008-10-09
申请号：US12071114
申请日：2008-02-15
申请人： Kouji Kumada , Takashige Ohta , Haruhito Kagawa
发明人： Kouji Kumada , Takashige Ohta , Haruhito Kagawa
IPC分类号： G09G3/36
CPC分类号： G09G3/3685 , G09G3/2014 , G09G3/3614 , G09G3/3648 , G09G2300/08 , G09G2330/021
摘要： An image display according to the present invention includes a driving device which performs pulse width modulation drive, restrains power consumption, and produces a good multi-tone display. The image display makes the difference between the scan line voltage and the signal line voltage equal in positive polarity writing and negative polarity writing by which pixels are AC driven, so as to make the on-resistances of transistors equal. This allows a maximum pulse width, the size of switching elements, etc. to be determined first so that they match positive polarity writing in which the resistances value of the switching elements rise. No high frequency clock is required to produce subtle differences of charge ratio in negative polarity writing in which the resistances of the switching elements fall. Power consumption which depends on the clock frequency drops too.
摘要翻译：根据本发明的图像显示器包括执行脉宽调制驱动的驱动装置，抑制功耗，并产生良好的多色调显示。图像显示使扫描线电压和信号线电压之间的差异在正极性写入和负极性写入中相等，通过该驱动将像素交替驱动，以使晶体管的导通电阻相等。这允许首先确定最大脉冲宽度，开关元件的尺寸等，使得它们匹配开关元件的电阻值上升的正极性写入。不需要高频时钟来产生负极性写入中的电荷比的微妙差异，其中开关元件的电阻下降。取决于时钟频率的功耗也会下降。

7. 发明授权

US07321353B2 Display device method of driving same and electronic device mounting same 有权
标题翻译：显示装置的驱动方法和电子装置安装相同
公开(公告)号：US07321353B2
公开(公告)日：2008-01-22
申请号：US09856926
申请日：2001-04-24
申请人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta
发明人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta
IPC分类号： G09G3/36
CPC分类号： G09G3/3648 , G02F1/133553 , G02F1/133555 , G02F1/136213 , G09G3/2092 , G09G3/3208 , G09G3/3258 , G09G3/3266 , G09G3/3614 , G09G3/3655 , G09G3/3677 , G09G3/3688 , G09G2300/0426 , G09G2300/0819 , G09G2300/0823 , G09G2300/0876 , G09G2310/0254 , G09G2310/027 , G09G2310/065 , G09G2310/08 , G09G2320/0209 , G09G2320/0247 , G09G2330/021 , G09G2360/18
摘要： A liquid crystal panel (2) includes scanning signal lines (31) for supplying scanning signals to gate electrodes (20) of TFTs (14), and data signal lines (32) for supplying data signals to data electrodes (24) of TFTs. The liquid crystal panel further includes auxiliary capacitive electrode pads (27a) for use in forming auxiliary capacitance and an auxiliary capacitive lines (33) so as not to generate a capacitive bond with the scanning signal lines. The liquid crystal panel is driven at a rewriting frequency of a screen of not more than 30 Hz. As a result, the liquid crystal panel can be driven at a low consumption power while maintaining a desirable display quality of the liquid crystal panel.
摘要翻译：液晶面板（2）包括用于向TFT（14）的栅电极（20）提供扫描信号的扫描信号线（31）和用于向TFT的数据电极（24）提供数据信号的数据信号线（32）。液晶面板还包括用于形成辅助电容的辅助电容电极焊盘（27a）和辅助电容线（33），以便不与扫描信号线产生电容性接合。液晶面板以不大于30Hz的屏幕的重写频率被驱动。结果，液晶面板可以以低功耗驱动，同时保持液晶面板的期望的显示质量。

8. 发明授权

US07286108B2 Display device, method of driving same and electronic device mounting same 有权
标题翻译：显示装置，其驱动方法和电子装置安装相同
公开(公告)号：US07286108B2
公开(公告)日：2007-10-23
申请号：US10846180
申请日：2004-05-14
申请人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta
发明人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta
IPC分类号： G09G3/36 , G02F1/1368
CPC分类号： G09G3/3648 , G02F1/133553 , G02F1/133555 , G02F1/136213 , G09G3/2092 , G09G3/3208 , G09G3/3258 , G09G3/3266 , G09G3/3614 , G09G3/3655 , G09G3/3677 , G09G3/3688 , G09G2300/0426 , G09G2300/0819 , G09G2300/0823 , G09G2300/0876 , G09G2310/0254 , G09G2310/027 , G09G2310/065 , G09G2310/08 , G09G2320/0209 , G09G2320/0247 , G09G2330/021 , G09G2360/18
摘要： A liquid crystal panel (2) includes scanning signal lines (31) for supplying scanning signals to gate electrodes (20) of TFTs (14), and data signal lines (32) for supplying data signals to data electrodes (24) of TFTs. The liquid crystal panel further includes auxiliary capacitive electrode pads (27a) for use in forming auxiliary capacitance and an auxiliary capacitive lines (33) so as not to generate a capacitive bond with the scanning signal lines. The liquid crystal panel is driven at a rewriting frequency of a screen of not more than 30 Hz. As a result, the liquid crystal panel can be driven at a low consumption power while maintaining a desirable display quality of the liquid crystal panel.
摘要翻译：液晶面板（2）包括用于向TFT（14）的栅电极（20）提供扫描信号的扫描信号线（31）和用于向TFT的数据电极（24）提供数据信号的数据信号线（32）。液晶面板还包括用于形成辅助电容的辅助电容电极焊盘（27a）和辅助电容线（33），以便不与扫描信号线产生电容性接合。液晶面板以不大于30Hz的屏幕的重写频率被驱动。结果，液晶面板可以以低功耗驱动，同时保持液晶面板的期望的显示质量。

9. 发明授权

US07924276B2 Display device, method of driving same and electronic device mounting same 有权
标题翻译：显示装置，其驱动方法和电子装置安装相同
公开(公告)号：US07924276B2
公开(公告)日：2011-04-12
申请号：US11900497
申请日：2007-09-11
申请人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta , Yutaka Kamezaki , Hitoshi Kamezaki, legal representative , Masano Kamezaki, legal representative
发明人： Kazuhiko Tsuda , Masahiro Shimizu , Hisakazu Nakamura , Kouji Kumada , Takashige Ohta , Yutaka Kamezaki
IPC分类号： G09G5/00
CPC分类号： G09G3/3648 , G02F1/133553 , G02F1/133555 , G02F1/136213 , G09G3/2092 , G09G3/3208 , G09G3/3258 , G09G3/3266 , G09G3/3614 , G09G3/3655 , G09G3/3677 , G09G3/3688 , G09G2300/0426 , G09G2300/0819 , G09G2300/0823 , G09G2300/0876 , G09G2310/0254 , G09G2310/027 , G09G2310/065 , G09G2310/08 , G09G2320/0209 , G09G2320/0247 , G09G2330/021 , G09G2360/18
摘要： A liquid crystal panel (2) includes scanning signal lines (31) for supplying scanning signals to gate electrodes (20) of TFTs (14), and data signal lines (32) for supplying data signals to data electrodes (24) of TFTs. The liquid crystal panel further includes auxiliary capacitive electrode pads (27a) for use in forming auxiliary capacitance and an auxiliary capacitive lines (33) so as not to generate a capacitive bond with the scanning signal lines. The liquid crystal panel is driven at a rewriting frequency of a screen of not more than 30 Hz. As a result, the liquid crystal panel can be driven at a low consumption power while maintaining a desirable display quality of the liquid crystal panel.
摘要翻译：液晶面板（2）包括用于向TFT（14）的栅电极（20）提供扫描信号的扫描信号线（31）和用于向TFT的数据电极（24）提供数据信号的数据信号线（32）。液晶面板还包括用于形成辅助电容的辅助电容电极焊盘（27a）和辅助电容线（33），以便不与扫描信号线产生电容性接合。液晶面板以不大于30Hz的屏幕的重写频率被驱动。结果，液晶面板可以以低功耗驱动，同时保持液晶面板的期望的显示质量。

10. 发明授权

US07098885B2 Display device, drive circuit for the same, and driving method for the same 失效
标题翻译：显示装置，驱动电路及其驱动方法相同
公开(公告)号：US07098885B2
公开(公告)日：2006-08-29
申请号：US10357480
申请日：2003-02-04
申请人： Kouji Kumada , Takashige Ohta , Haruhito Kagawa
发明人： Kouji Kumada , Takashige Ohta , Haruhito Kagawa
IPC分类号： G09G3/36
CPC分类号： G09G3/3614 , G09G3/3688 , G09G2310/0248 , G09G2310/027 , G09G2330/021
摘要： In a signal line drive circuit of an active-matrix type liquid-crystal display which is a voltage-controlled type display with a capacitive load, n selector switches (161 to 16n) are provided between buffer circuits (151 to 15n) to which voltages responsive to an image to be displayed are inputted from reference voltage selection circuits (131 to 13n), and output terminals (T1 to Tn) to which are connected image signal lines. These selector switches (161 to 16n), based on a shorting control signal (Csh) that is at a high level when the polarity is reversed to perform AC drive of the liquid-crystal panel, switch the output signals (OUT1 to OUTn of the image signal line drive circuit between the output signals of the buffer circuits (151 to 15n) and the common electrode signal (Vcom). By doing this, each of the image signal lines is, for a prescribed time only when the polarity is reversed, separated from the buffer circuits (151 to 15n) and shorted to the common electrode. This configuration reduces the power consumption of the signal line drive circuit
摘要翻译：在作为具有电容性负载的电压型显示器的有源矩阵型液晶显示器的信号线驱动电路中，在缓冲电路（151〜15n）之间设置n个选择开关（161〜16n）〜从参考电压选择电路（131〜13 n）输入响应于要显示的图像的电压，以及连接有图像信号线的输出端子（T1〜Tn）。这些选择开关（161〜16n）根据极性反转时的高电平的短路控制信号（Csh）进行液晶面板的交流驱动，将输出信号（OUT 1〜OUT n （151〜15n）的输出信号和公共电极信号（Vcom）之间的图像信号线驱动电路，通过这样做，每个图像信号线仅在极性与缓冲电路（151〜15n）分离并与公共电极短路，这种结构降低了信号线驱动电路的功耗

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