Patents by Inventor Chao-Hui Wu
Chao-Hui Wu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8922500Abstract: A projective capacitive touch sensor includes a substrate, a plurality of electrode layers and a plurality of dielectric layers. The electrode layers are arranged on the substrate along a first direction. At least one dielectric layer is formed on each electrode layer and the dielectric layer has different widths along a second direction.Type: GrantFiled: October 7, 2010Date of Patent: December 30, 2014Assignee: Hannstar Display Corp.Inventors: Yi Chung Juan, Chao Hui Wu, Hung Chang Chang
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Patent number: 8854566Abstract: The present invention provides a method for forming a pixel element. The method comprises: forming a first patterned metal layer within the pixel area; forming an insulation layer on the first patterned metal layer; forming a semiconductor layer on the insulation layer; patterning the semiconductor layer to form bend seed generation portion; and forming a second metal layer to connect the semiconductor layer.Type: GrantFiled: January 19, 2012Date of Patent: October 7, 2014Assignee: Hannstar Display Corp.Inventors: Tsu-Chiang Chang, Po-Yang Chen, Chao-Hui Wu, Po-Sheng Shih
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Patent number: 8804076Abstract: The present invention provides a liquid crystal display device including a liquid crystal panel. The liquid crystal panel has a plurality of pixel regions, and the liquid crystal panel includes a first substrate, a second substrate, a liquid crystal layer, and a light-absorbing layer. The second substrate and the first substrate are disposed opposite to each other, and the liquid crystal layer is disposed between the first substrate and the second substrate. The light-absorbing layer is disposed between the first substrate and the second substrate in the pixel regions, and the light-absorbing layer is configured to absorb a light having a wavelength within a range between 380 nm and 560 nm.Type: GrantFiled: June 26, 2012Date of Patent: August 12, 2014Assignee: HannStar Display Corp.Inventors: Chih-Pin Lin, Chao-Hui Wu
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Patent number: 8779666Abstract: A compensation circuit for keeping luminance intensity of a diode. The compensation circuit comprises a stabilization unit, a first transistor, a second transistor, a third transistor, a fourth transistor and an organic light emitting diode (OLED). The stabilization unit comprises a photodiode and a compensation capacitor. The second transistor is used to control the input time of data. In the operation of the OLED, the third transistor discharges or charges a node of the stabilization unit continuously to keep a voltage equal to VSS or VDD, so as to maintain the luminance intensity of the OLED.Type: GrantFiled: January 19, 2012Date of Patent: July 15, 2014Assignee: Hannstar Display CorporationInventors: Chien-Chaun Ko, Chao-Hui Wu
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Patent number: 8704800Abstract: A photo element includes a capacitor, a switch thin film transistor (TFT), a charge thin film transistor, and a photo thin film transistor. A voltage is charged to the capacitor through the charge TFT, and the output voltage of the capacitor is read through the readout line. The photo-induced current will affect the output voltage of the capacitor; therefore it is employed to determine whether the photo element is touched. Later, a reverse-biased voltage is applied to the photo TFT, such that the threshold voltage and sensitivity of the photo TFT can be maintained.Type: GrantFiled: April 30, 2010Date of Patent: April 22, 2014Assignee: Hannstar Display Corp.Inventors: Hung-Chang Chang, Yi-Chung Juan, Chao-Hui Wu
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Patent number: 8604705Abstract: A compensation circuit of organic light emitting diode comprising a first capacitor, a second capacitor, a stabilizer unit, a third transistor, an organic light emitting diode and a driver unit. The stabilizer unit comprises a first transistor, a second transistor and a photodiode. The driver unit comprises a fourth transistor, a fifth transistor and a sixth transistor. The fifth transistor is used for driving the organic light emitting diode. The first transistor, the second transistor, the third transistor, the fourth transistor and the sixth transistor are used as switches. The first capacitor is used as a compensation capacitor. The second capacitor is used for storing a data voltage. By controlling a voltage of a node in the circuit, the current of the organic light emitting diode can be increased to maintain a stable brightness of the organic light emitting diode.Type: GrantFiled: January 26, 2012Date of Patent: December 10, 2013Assignee: Hannstar Display CorporationInventors: Chien-Chuan Ko, Chao-Hui Wu
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Patent number: 8542328Abstract: A pixel structure of a liquid crystal display panel includes a substrate, a first metallic layer, a light shielding element, a second metallic layer and a pixel electrode. The first metallic layer and the light shielding element are disposed above the substrate. The second metallic layer is disposed above the light shielding element, and includes first and second data lines. The first data line is disposed along the light shielding element, and is partially overlapped with the light shielding element. The second data line is parallel to the first data line. A first portion of the pixel electrode is overlapped with the first data line, and is not overlapped with the light shielding element. A second portion of the pixel electrode is overlapped with the light shielding element, and is not overlapped with the first data line.Type: GrantFiled: March 24, 2010Date of Patent: September 24, 2013Assignee: Hannstar Display Corp.Inventors: Tsu Chiang Chang, Chao Hui Wu
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Publication number: 20130177128Abstract: Shift register and method thereof are provided. The proposed shift register includes a first to a third transistors, each of which has a first terminal, a second terminal and a control terminal, wherein the second terminal of the first transistor, the control terminal of the second transistor and the first terminal of the third transistor are electrically connected to a node, and the first terminal of the first transistor is electrically connected to the control terminal of the first transistor.Type: ApplicationFiled: June 18, 2012Publication date: July 11, 2013Applicant: HANNSTAR DISPLAY CORP.Inventors: Chien-Chuan Ko, Chao-Hui Wu
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Publication number: 20130176514Abstract: The present invention provides a pixel structure of a display apparatus. The pixel structure is disposed on a substrate of the display apparatus. The pixel structure comprises pixel electrode and at least one switching element electrically connected to the pixel electrode. The switching element comprises a first electrode including an opening, and a second electrode including a bend extension portion, wherein the bend extension portion extends into the opening of the first electrode. The present invention can improve the problems existing in a conventional optically compensated birefringence (OCB) mode liquid crystal display.Type: ApplicationFiled: July 19, 2012Publication date: July 11, 2013Applicant: HANNSTAR DISPLAY CORPORATIONInventors: Ko-ruey Jen, Chao-hui Wu
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Publication number: 20130063398Abstract: An optical touch display panel and a touch sensing method thereof are provided. The optical touch display panel includes a scan line, a readout line, and a photosensing unit. The photosensing unit is activated in response to a scan signal received by the scan line, and reacts a photosensing current on the readout line according to the scan signal and a reference level.Type: ApplicationFiled: December 19, 2011Publication date: March 14, 2013Applicant: HANNSTAR DISPLAY CORPORATIONInventors: Chien-Chuan Ko, Chao-Hui Wu
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Publication number: 20130063683Abstract: The present invention provides a liquid crystal display device including a liquid crystal panel. The liquid crystal panel has a plurality of pixel regions, and the liquid crystal panel includes a first substrate, a second substrate, a liquid crystal layer, and a light-absorbing layer. The second substrate and the first substrate are disposed opposite to each other, and the liquid crystal layer is disposed between the first substrate and the second substrate. The light-absorbing layer is disposed between the first substrate and the second substrate in the pixel regions, and the light-absorbing layer is configured to absorb a light having a wavelength within a range between 380 nm and 560 nm.Type: ApplicationFiled: June 26, 2012Publication date: March 14, 2013Inventors: Chih-Pin Lin, Chao-Hui Wu
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Publication number: 20130043796Abstract: A compensation circuit of organic light emitting diode comprising a first capacitor, a second capacitor, a stabilizer unit, a third transistor, an organic light emitting diode and a driver unit. The stabilizer unit comprises a first transistor, a second transistor and a photodiode. The driver unit comprises a fourth transistor, a fifth transistor and a sixth transistor. The fifth transistor is used for driving the organic light emitting diode. The first transistor, the second transistor, the third transistor, the fourth transistor and the sixth transistor are used as switches. The first capacitor is used as a compensation capacitor. The second capacitor is used for storing a data voltage. By controlling a voltage of a node in the circuit, the current of the organic light emitting diode can be increased to maintain a stable brightness of the organic light emitting diode.Type: ApplicationFiled: January 26, 2012Publication date: February 21, 2013Applicant: HANNSTAR DISPLAY CORP.Inventors: Chien-Chuan Ko, Chao-Hui Wu
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Patent number: 8368633Abstract: A pixel data preprocessing method includes the steps of: inputting a first frame data into a timing controller; performing a differential operation on the first frame data to generate a first frame differential data; writing the first frame differential data into a frame memory with the timing controller; reading a second frame differential data from the frame memory with the timing controller; performing an inverse differential operation on the second frame differential data to generate a second frame data; comparing the first frame data and the second frame data; and outputting a driving data with the timing controller according to a comparison result of comparing the first frame data and the second frame data. The present invention further provides a pixel data preprocessing circuit.Type: GrantFiled: December 11, 2009Date of Patent: February 5, 2013Assignee: Hannstar Display Corp.Inventors: Tai Shun Liao, Po Sheng Shi, Chao Hui Wu
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Publication number: 20130009550Abstract: A compensation circuit for keeping luminance intensity of a diode. The compensation circuit comprises a stabilization unit, a first transistor, a second transistor, a third transistor, a fourth transistor and an organic light emitting diode (OLED). The stabilization unit comprises a photodiode and a compensation capacitor. The second transistor is used to control the input time of data. In the operation of the OLED, the third transistor discharges or charges a node of the stabilization unit continuously to keep a voltage equal to VSS or VDD, so as to maintain the luminance intensity of the OLED.Type: ApplicationFiled: January 19, 2012Publication date: January 10, 2013Applicant: HANNSTAR DISPLAY CORP.Inventors: Chien-Chuan Ko, Chao-Hui Wu
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Publication number: 20120242712Abstract: The gate of the first TFT in the present invention is discharged through the first TFT and the OLED in the compensation and data writing stage operation. As in cases that the usage time of the display pixel extends and the threshold voltage of the first TFT increases and the mobility thereof decreases, the voltage of the OLED increases, or the size of the display becomes larger to induce IR drop, the present invention enables to reduce the discharge voltage (charge current) to raise the gate voltage of the first TFT for compensating the OLED current drop. Meanwhile, the fifth TFT has characteristic of the threshold voltage increase. As the threshold voltage of the fifth TFT increases with usage time, the compensation of the OLED luminous efficiency drop can be realized.Type: ApplicationFiled: February 3, 2012Publication date: September 27, 2012Applicant: Hannstar Display CorporationInventors: CHIEN-CHUAN KO, Chao-hui Wu
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Patent number: 8264629Abstract: The present invention provides a method for forming a pixel element. The method comprises: forming a first patterned metal layer within the pixel area; forming an insulation layer on the first patterned metal layer; forming a semiconductor layer on the insulation layer; patterning the semiconductor layer to form bend seed generation portion; and forming a second metal layer to connect the semiconductor layer.Type: GrantFiled: October 16, 2009Date of Patent: September 11, 2012Assignee: Hannstar Display Corp.Inventors: Tsu-Chiang Chang, Po-Yang Chen, Chao-Hui Wu, Po-Sheng Shih
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Patent number: 8179349Abstract: A pixel structure includes a first sub-pixel and a second sub-pixel. The first sub-pixel includes a first switching transistor and a first liquid crystal capacitor, wherein when the first switching transistor is turned on, the first liquid crystal capacitor is biased to a first gray level voltage. The second sub-pixel includes a second switching transistor, a second liquid crystal capacitor, a third switching transistor, a charge sharing capacitor and a fourth switching transistor, wherein when the second switching transistor is turned on, the second liquid crystal capacitor is biased to the first gray level voltage; when the fourth switching transistor is turned on, the charge sharing capacitor is reset to a predetermined voltage; and when the third switching transistor is turned on, the second liquid crystal capacitor and the charge sharing capacitor are charge-shared to a second gray level voltage through the third switching transistor.Type: GrantFiled: January 18, 2010Date of Patent: May 15, 2012Assignee: Hannstar Display Corp.Inventors: Tai Shun Liao, Po Sheng Shi, Chao Hui Wu
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Publication number: 20120115264Abstract: The present invention provides a method for forming a pixel element. The method comprises: forming a first patterned metal layer within the pixel area; forming an insulation layer on the first patterned metal layer; forming a semiconductor layer on the insulation layer; patterning the semiconductor layer to form bend seed generation portion; and forming a second metal layer to connect the semiconductor layer.Type: ApplicationFiled: January 19, 2012Publication date: May 10, 2012Inventors: Tsu-Chiang Chang, Po-Yang Chen, Chao-Hui Wu, Po-Sheng Shih
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Publication number: 20120081639Abstract: A liquid crystal display device includes a first polarization plate, a first birefringent film atop the first polarization plate, an optically compensated bend mode (OCB-mode) cell atop the first birefringent film, a refractive film atop the OCB-mode cell, a second birefringent film atop the refractive film, and a second polarization plate atop the second birefringent film. With this structure, any phase retardation of polarized light occurred during the propagation of the polarized light from the first polarization plate to the second polarization plate is compensated by the first birefringent film, the refractive film, and the second birefringent film and a substantially cross-shaped radiation pattern of full viewing angle is obtained in an actual measurement at the light outgoing surface of the liquid crystal display device, proving the liquid crystal display device has effectively improved the problem of restricted viewing angle and provides good optical performance.Type: ApplicationFiled: September 26, 2011Publication date: April 5, 2012Inventors: Guang-Shiung Chao, Feng-Weei Kuo, Li-Chao Chien, Ra-Bin Li, Cheng-Chia Wu, Chao-Hui Wu
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Patent number: 8125594Abstract: A pixel structure of a liquid crystal display includes a substrate, a light shielding element, a first data line, a second data line and a pixel electrode. The light shielding element is formed on the substrate. The first and second data lines are formed along the light shielding element, and the second data line overlaps with portions of the light shielding element. The pixel electrode overlaps with portions of the first data line and the light shielding element without overlapping with the second data line.Type: GrantFiled: December 30, 2008Date of Patent: February 28, 2012Assignee: Hannstar Display Corp.Inventors: Tsu Chiang Chang, Po Sheng Shih, Po Yang Chen, Chao Hui Wu