公开(公告)号：US20130044146A1

公开(公告)日：2013-02-21

申请号：US13647710

申请日：2012-10-09

申请人： Yoshiki KUROKAWA ,  Yukari KATAYAMA ,  Hiroki AWAKURA ,  Naoki TAKADA ,  Yasuyuki KUDO ,  Akihito AKAI ,  Goki TOSHIMA ,  Akihisa AOYAMA ,  Goro SAKAMAKI

发明人： Yoshiki KUROKAWA ,  Yukari KATAYAMA ,  Hiroki AWAKURA ,  Naoki TAKADA ,  Yasuyuki KUDO ,  Akihito AKAI ,  Goki TOSHIMA ,  Akihisa AOYAMA ,  Goro SAKAMAKI

IPC分类号： G09G5/10 ,  G09G5/00

CPC分类号： G09G3/3406 ,  G09G3/3611 ,  G09G2320/0276 ,  G09G2320/064 ,  G09G2320/0646 ,  G09G2320/0653 ,  G09G2320/066 ,  G09G2330/021 ,  G09G2360/145 ,  G09G2360/16

摘要： In a display device and a display driver, when a grayscale of a display image is equal to or lower than a specific grayscale value obtained from a histogram of the display image, a display grayscale is extended with a linear function. On the other hand, when a grayscale of a display image is equal to or higher than the specific grayscale value, histogram equalization of a part higher than the specific grayscale value is performed, and the display grayscale is extended with a non-linear function obtained from the histogram equalization.

摘要翻译： 在显示装置和显示驱动器中，当显示图像的灰阶等于或低于从显示图像的直方图获得的特定灰度值时，以线性函数扩展显示灰度级。 另一方面，当显示图像的灰阶等于或高于特定灰度值时，执行高于特定灰度值的部分的直方图均衡，并且通过获得的非线性函数来扩展显示灰度级 从直方图均衡。

公开(公告)号：US20120139972A1

公开(公告)日：2012-06-07

申请号：US13372814

申请日：2012-02-14

申请人： Yasuyuki KUDO ,  Akihito AKAI ,  Kazuo OOKADO ,  Kazunari KUROKAWA ,  Hiroki AIZAWA

发明人： Yasuyuki KUDO ,  Akihito AKAI ,  Kazuo OOKADO ,  Kazunari KUROKAWA ,  Hiroki AIZAWA

IPC分类号： G09G3/36 ,  G09G5/02 ,  G09G5/10

CPC分类号： G09G3/3607 ,  G09G3/3614 ,  G09G3/3688 ,  G09G3/3696 ,  G09G2310/027 ,  G09G2320/0276 ,  G09G2320/0606 ,  G09G2320/0673

摘要： Display driving arrangements including: generation circuit dividing a reference voltage by variable resistors for plural levels of voltages; a decoder circuit decoding gray scale voltage corresponding to the display data among the levels of voltages; and a register setting variable resisters resistance values to adjust amplitude and gradient of the gamma characteristic curve of the gray scale voltages with respect to the gray scale number, the generation circuit having a group of resistive voltage dividing circuits dividing the reference voltage, a variable resister amplitude adjusting the gamma characteristic curve in accordance with register setting values connected with a side of the reference voltage in series, being closer to the side of the reference voltage than the group of resistive voltage dividing circuits, a variable resister to adjust the gradient of the gamma characteristic curve per the register setting values connected within the group of resistive voltage dividing circuits in series.

摘要翻译： 显示驱动装置包括：通过可变电阻器对多个电压电平分压参考电压的发电电路; 解码器电路，解码与电压电平之间的显示数据相对应的灰度级电压; 并且寄存器设置变量阻止电阻值以调整相对于灰度级数的灰度级电压的伽马特性曲线的幅度和梯度，所述发生电路具有划分参考电压的一组电阻分压电路，可变电阻器 根据与参考电压的一侧串联连接的寄存器设定值来调整伽马特性曲线，其比基于电阻分压电路的组更接近参考电压的一侧;变阻器，用于调整 每个串联的电阻分压电路组内的寄存器设定值的伽马特性曲线。

公开(公告)号：US08059141B2

公开(公告)日：2011-11-15

申请号：US11923970

申请日：2007-10-25

申请人： Hiroki Awakura ,  Akihito Akai ,  Yoshiki Kurokawa ,  Naoki Takada ,  Goro Sakamaki

发明人： Hiroki Awakura ,  Akihito Akai ,  Yoshiki Kurokawa ,  Naoki Takada ,  Goro Sakamaki

IPC分类号： G09G5/10

CPC分类号： G09G3/3406 ,  G09G3/3233 ,  G09G2300/0842 ,  G09G2320/064 ,  G09G2360/144

摘要： A display brightness control circuit of a liquid crystal display device includes a logarithmic-linear converting circuit for converting an illuminance signal having a logarithmic relationship with incident light into a linear signal. When an output of an external light sensor is a logarithmic signal, the logarithmic signal is converted into a linear signal through the logarithmic-linear converting circuit, and when an output of the external light sensor is a linear signal, the logarithmic-linear converting circuit is not involved. The logarithmic-linear converting circuit corresponds to an exponential circuit which is an inverse function of a logarithm log. Further, when even the same logarithmic output illuminance sensor is different in input-output characteristics, setting of the abovementioned exponential circuit can be changed.

摘要翻译： 液晶显示装置的显示亮度控制电路包括对数线性转换电路，用于将具有入射光的对数关系的照度信号转换为线性信号。 当外部光传感器的输出是对数信号时，通过对数线性转换电路将对数信号转换成线性信号，并且当外部光传感器的输出是线性信号时，对数线性转换电路 不参与 对数线性转换电路对应于作为对数日志的反函数的指数电路。 此外，即使相同的对数输出照度传感器在输入输出特性上不同，也可以改变上述指数电路的设定。

公开(公告)号：US20110242139A1

公开(公告)日：2011-10-06

申请号：US12750781

申请日：2010-03-31

申请人： Goki Toshima ,  Yasuyuki Kudo ,  Yoshiki Kurokawa ,  Akihito Akai

发明人： Goki Toshima ,  Yasuyuki Kudo ,  Yoshiki Kurokawa ,  Akihito Akai

IPC分类号： G09G5/10

CPC分类号： G09G3/3406 ,  G09G2320/0646 ,  G09G2330/021 ,  G09G2340/02

摘要： The display driver achieves the balance between the image quality and power-cutting ratio by controlling the backlight dimming ratio to keep the image quality after backlight dimming constant. The display driver uses e.g. MSE (Mean Square Error) as an index of image quality. The reference gradation control unit controls the data decompression and backlight dimming ratios, thereby to keep the image quality after backlight dimming constant. Assuming display data decompression, and backlight dimming, the error calculating unit calculates a decrease of luminance for an input displayed image as MSE based on the decompression and dimming ratios of a preceding frame, in advance. In the case of MSE over a predetermined value, the decompression unit and light-adjustment control unit decrease the decompression and dimming ratios to below those of the preceding frame, respectively. In the case of MSE below the value, the ratios are lowered to below those of the preceding frame.

摘要翻译： 显示驱动器通过控制背光调光比来实现图像质量和功率切换比之间的平衡，以在背光调光之后保持图像质量恒定。 显示驱动器使用例如 MSE（均方误差）作为图像质量的指标。 参考灰度控制单元控制数据解压缩和背光调光比，从而在背光调光恒定后保持图像质量。 假设显示数据解压缩和背光调光，误差计算单元预先基于前一帧的解压缩和调光比来计算输入显示图像的亮度的降低为MSE。 在MSE超过预定值的情况下，解压缩单元和调光控制单元分别将解压缩和调光比降低到前一帧以下。 在MSE低于该值的情况下，比率降低到低于前一帧的比率。

公开(公告)号：US20110242112A1

公开(公告)日：2011-10-06

申请号：US12750794

申请日：2010-03-31

申请人： Yukari KATAYAMA ,  Akihito Akai ,  Yoshiki Kurokawa ,  Takashi Shoji

发明人： Yukari KATAYAMA ,  Akihito Akai ,  Yoshiki Kurokawa ,  Takashi Shoji

IPC分类号： G06T1/00 ,  G06T9/00

CPC分类号： G09G5/36 ,  G09G2340/02 ,  G09G2360/18 ,  H04N19/115 ,  H04N19/154 ,  H04N19/17 ,  H04N19/196 ,  H04N19/198

摘要： The display driver includes: a display data compression circuit; a recording circuit; a display data decompression circuit; and an output circuit. Further, the display driver is provided with a compressibility setting circuit. The display data compression circuit has the function of compressing the display data according to a compressibility set by the compressibility setting circuit. With the display driver arranged like this, the power consumption can be reduced by increasing the compressibility for a displayed image such that the image quality is not noticeably deteriorated even with the compressibility increased. Further, for the displayed image such that the image quality is noticeably deteriorated with the compressibility increased, a sufficient image quality after data decompression can be secured by lowering the compressibility.

摘要翻译： 显示驱动器包括：显示数据压缩电路; 记录电路; 显示数据解压缩电路; 和输出电路。 此外，显示驱动器设置有压缩性设定电路。 显示数据压缩电路具有根据由压缩性设定电路设定的压缩率压缩显示数据的功能。 通过这样布置的显示驱动器，可以通过增加显示图像的压缩率来降低功耗，使得即使压缩率增加，图像质量也不会显着劣化。 此外，对于所显示的图像，使得图像质量在可压缩性增加时显着劣化，可以通过降低压缩性来确保数据解压缩之后的足够的图像质量。

公开(公告)号：US07924252B2

公开(公告)日：2011-04-12

申请号：US11443224

申请日：2006-05-31

申请人： Akihito Akai ,  Yasuyuki Kudo ,  Takuya Eriguchi ,  Kazuo Okado

发明人： Akihito Akai ,  Yasuyuki Kudo ,  Takuya Eriguchi ,  Kazuo Okado

IPC分类号： G09G3/36

CPC分类号： G09G3/3696 ,  G09G3/20 ,  G09G3/3614 ,  G09G3/3688 ,  G09G2310/0297 ,  G09G2320/0219 ,  G09G2320/0276 ,  G09G2320/0673 ,  G09G2330/021 ,  G09G2360/18

摘要： In consideration of the current leakage path of a liquid crystal panel and a signal line voltage fluctuation due to the current leakage path, a γ adjusting function (second driving method) is applied for each divided period in the first driving method. In a signal line driving unit, a gray scale voltage obtained by adding or subtracting a voltage fluctuation value different in each of the output periods of each gray scale is generated, and a gray scale voltage taking the voltage fluctuation value into consideration is applied to a signal line.

摘要翻译： 考虑到液晶面板的电流泄漏路径和由于电流泄漏路径引起的信号线电压波动，在第一驱动方法中，对于每个分割周期应用γ调整功能（第二驱动方法）。 在信号线驱动单元中，生成通过对每个灰度级的每个输出周期不同的电压波动值进行相加或减去而获得的灰度级电压，并且将考虑了电压波动值的灰度级电压应用于 信号线。

公开(公告)号：US20100265242A1

公开(公告)日：2010-10-21

申请号：US12760582

申请日：2010-04-15

申请人： Naoki TAKADA ,  Naruhiko Kasai ,  Takuya Eriguchi ,  Yuki Okada ,  Mitsuru Goto ,  Akihito Akai

发明人： Naoki TAKADA ,  Naruhiko Kasai ,  Takuya Eriguchi ,  Yuki Okada ,  Mitsuru Goto ,  Akihito Akai

IPC分类号： G06F3/038 ,  G05F1/00

CPC分类号： H02M3/156

摘要： A power circuit includes a coil that charges an electric charge of an input voltage, a switch device that controls charging and discharging of the coil, a diode that rectifies the flow of the electric charge from the coil, a capacitor that stabilizes an output voltage when the switch device is turned on, and a driving circuit that controls ON and OFF states of the switch device. The power circuit alternately switches the ON and OFF states of the switch device to control charging and discharging of the coil and the capacitor, and generates and supplies an output voltage higher than the input voltage, and the driving circuit controls the off-period of the switch device according to the on-period of the switch device and the voltage ratio of the output voltage and the input voltage while changing the repetition period of the ON and OFF states of the switch device.

摘要翻译： 电源电路包括对输入电压的电荷进行充电的线圈，控制线圈的充电和放电的开关装置，对来自线圈的电荷的流量进行整流的二极管，稳定输出电压的电容器， 开关装置被接通，以及控制开关装置的ON和OFF状态的驱动电路。 电源电路交替地切换开关器件的导通和截止状态，以控制线圈和电容器的充电和放电，并产生并提供高于输入电压的输出电压，并且驱动电路控制 开关装置根据开关装置的导通周期和开关装置的ON和OFF状态的重复周期，输出电压和输入电压的电压比。

公开(公告)号：US07643042B2

公开(公告)日：2010-01-05

申请号：US11109718

申请日：2005-04-20

申请人： Yasuyuki Kudo ,  Akihito Akai ,  Kazuo Okado ,  Toshimitsu Matsudo ,  Atsuhiro Higa

发明人： Yasuyuki Kudo ,  Akihito Akai ,  Kazuo Okado ,  Toshimitsu Matsudo ,  Atsuhiro Higa

IPC分类号： G09G5/00 ,  G06K9/00

CPC分类号： G09G3/2051 ,  G09G3/2018 ,  G09G3/2092 ,  G09G3/3648 ,  G09G5/02 ,  G09G2330/021 ,  G09G2360/18

摘要： A display driver for outputting gradation voltages corresponding to gradation data from an external device to pixels. The display driver includes a generator for generating a plurality of gradation voltages having a plurality of levels based on a reference voltage, and a selector for selecting at least one gradation voltage corresponding to the gradation data from the plurality of gradation voltages generated by the generator. The gradation data includes multi-bits for each color of red, green and blue, and the generator outputs or stops outputting each gradation voltage according to data for color reduction from the external device. The generator stops outputting at least one gradation voltage that is unnecessary for displaying as a result of the color reduction, when the color of the gradation data is reduced according to the data for color reduction.

摘要翻译： 一种用于将对应于来自外部设备的灰度数据的灰度电压输出到像素的显示驱动器。 显示驱动器包括：发生器，用于基于参考电压产生具有多个电平的多个灰度电压;以及选择器，用于从由发生器产生的多个灰度电压中选择与灰度数据相对应的至少一个灰度电压。 灰度数据包括红色，绿色和蓝色的每种颜色的多位，并且发生器根据来自外部设备的色彩还原的数据输出或停止输出每个灰度电压。 当根据用于减色的数据减少灰度数据的颜色时，发生器停止输出作为减色的结果而不必要显示的至少一个灰度电压。

公开(公告)号：US07616221B2

公开(公告)日：2009-11-10

申请号：US10879047

申请日：2004-06-30

申请人： Yasuyuki Kudo ,  Akihito Akai ,  Takuya Eriguchi ,  Kazuo Okado ,  Hiroki Aizawa

发明人： Yasuyuki Kudo ,  Akihito Akai ,  Takuya Eriguchi ,  Kazuo Okado ,  Hiroki Aizawa

IPC分类号： G09G3/36 ,  G09G5/10 ,  G06F3/038

CPC分类号： G09G3/2011 ,  G09G3/2025 ,  G09G3/3614 ,  G09G3/3688 ,  G09G3/3696 ,  G09G2330/021

摘要： A driving circuit provided by the present invention is characterized in that the driving circuit selects a gray-scale voltage in accordance with high-order bits of display data from a group of gray-scale voltages with their voltage level varying step by step from fractional time period to fractional time period, which are set in advance, and outputs the selected gray-scale voltage during a time period between the start of a scanning period and a time at which a number assigned to a fractional time period matches quantitative information contained in low-order bits of the display data. In addition, the driving circuit provided by the present invention is also characterized in that the time ratio of the first fractional time period is set at a relatively high value while the time ratios of the second and subsequent fractional time periods are each set at a relatively low value.

摘要翻译： 本发明提供的驱动电路的特征在于，驱动电路根据来自一组灰度级电压的显示数据的高位选择灰度电压，其电压电平从分数时间逐步变化 预先设定的时间间隔到分数时间段，并且在扫描周期的开始和分配给分数时间段的时间之间的时间段期间输出所选择的灰度级电压与低包含的定量信息相匹配 显示数据的顺序位。 此外，本发明提供的驱动电路的特征还在于，将第一分数时间段的时间比设定为相对较高的值，同时将第二和后续分数时间段的时间比率设置为相对较高 低价值。

公开(公告)号：US20070257942A1

公开(公告)日：2007-11-08

申请号：US11776158

申请日：2007-07-11

申请人： Yasuyuki KUDO ,  Akihito Akai ,  Kazuo Ookado ,  Kazunari Kurokawa ,  Atsuhiro Higa

发明人： Yasuyuki KUDO ,  Akihito Akai ,  Kazuo Ookado ,  Kazunari Kurokawa ,  Atsuhiro Higa

IPC分类号： G09G5/10

CPC分类号： G09G3/2092 ,  G09G3/20 ,  G09G3/2011 ,  G09G3/3614 ,  G09G3/3688 ,  G09G3/3696 ,  G09G2310/027 ,  G09G2320/0626 ,  G09G2320/066 ,  G09G2320/08 ,  G09G2330/021 ,  G09G2330/028 ,  G09G2360/18 ,  H03F3/347 ,  H03F3/45475

摘要： A generation circuit generates gray scale voltages having a plurality of levels for positive polarity and gray scale voltages having a plurality of levels for negative polarity; wherein said generation circuit, in the mode in which the number of colors to be displayed on a display panel is small, decreases a current flowing into an internal circuit which generates a gray scale voltage of an intermediate level other than two gray scale voltages of a gray scale voltage of the most lowest level and a gray scale voltage of the most highest level among the gray scale voltages of said plurality of levels, in comparison to a current flowing in the other mode; and wherein said selection circuit, in the mode in which the number of colors to be displayed on said display panel is small, selects said gray scale voltage according to said display data, from the two gray scale voltages of said most lowest level gray scale voltage and said most highest level gray scale voltage which are generated from said generation circuit.

摘要翻译： 一代电路产生具有多个电平的灰度级电压，所述多个电平具有用于负极性的多个电平的正极性和灰度级电压; 其中所述产生电路在显示面板上要显示的颜色数量小的模式中，减少流入内部电路的电流，该内部电路产生除了两个灰度级电压之外的中间电平的灰度电压 与在另一模式中流动的电流相比，最低电平的灰度电压和所述多个电平的灰度级电压中最高电平的灰度级电压; 并且其中所述选择电路在要显示在所述显示面板上的颜色数量小的模式中，根据所述显示数据从所述最低级灰度级电压的两个灰度级电压中选择所述灰度级电压 并且表示从所述发电电路产生的最高等级的灰度级电压。