Patents by Inventor Chih-Li Chang
Chih-Li Chang 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: 7486354Abstract: A cut filter is used in a backlight module or a display device and positioned over the light source to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light. By filtering off the overlapping part of light emitted from the light source to obtain a purer primary color light, the display device equipped with a conventional color filter can attain an improved color gamut.Type: GrantFiled: January 26, 2006Date of Patent: February 3, 2009Assignee: HannStar Display Corp.Inventors: Chih-Li Chang, Chi-Jen Huang, Hung-Chen Kao, Ching-Cherng Sun, Cheng-Chung Lee
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Patent number: 7440045Abstract: A flat panel display including a backlight module, a liquid crystal display panel, and a brightness enhancement diffuser plate (BEDP) is provided. The liquid crystal display panel is disposed on the backlight module, and the BEDP is disposed between the backlight module and the liquid crystal display panel. Furthermore, the BEDP includes a first and a second diffusion layers embedded to each other, wherein the first diffusion layer is disposed near the liquid crystal display panel, the second diffusion layer is disposed near the backlight module, and the first and the second diffusion layers have different refractive indexes, transmittances and haze values, so that optical performance of the flat panel display is optimized.Type: GrantFiled: January 20, 2005Date of Patent: October 21, 2008Assignee: Hannstar Display CorporationInventors: Chi-Jen Huang, Chih-Li Chang
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Publication number: 20080252818Abstract: A backlight module including a frame, a plurality of light guide plates, a plurality of high refractive mediums, and a plurality of light sources is provided. The light guide plates are disposed within the frame and each of the light guide plates has at least one light incident surface and at least one light emitting surface. Additionally, high refractive mediums are disposed between two neighboring light guide plates. Moreover, the light sources are disposed beside the light incident surfaces of the light guide plates.Type: ApplicationFiled: June 8, 2007Publication date: October 16, 2008Applicant: HANNSTAR DISPLAY CORPORATIONInventors: Zhao-Hui Wu, Chih-Li Chang
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Publication number: 20080136997Abstract: A liquid crystal display device has an upper prism sheet and a lower polarizer disposed on the upper prism sheet. The upper prism sheet has a plurality of first parallel ridgelines arranged in a first direction and a light-condensing direction. The first direction of the first parallel ridgelines is substantially perpendicular to the light-condensing direction. The lower polarizer has a first transmissive axis substantially parallel to the light-condensing direction.Type: ApplicationFiled: December 6, 2006Publication date: June 12, 2008Inventors: Chih-Li Chang, Cheng-Chia Wu, Hung-Chen Kao
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Patent number: 7350955Abstract: A back light source module of a liquid crystal device is provided. The back light source module includes a backplate, a light source fixture disposed on the backplate. The back light source module also includes a first light source having a first normal line and disposing on the light source fixture, a second light source having a second normal line and disposing on the light source fixture, and a third light source having a third normal line and disposing on the light source fixture. Among them, a first angle is formed between the second normal line and the first normal line, a second angle is formed between the third normal line and the first normal line, and both the first angle and the second angle are less than 90 degrees.Type: GrantFiled: December 1, 2005Date of Patent: April 1, 2008Assignee: Hannstar Display CorporationInventors: Chih-Li Chang, Hung-Chen Kao
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Publication number: 20080074580Abstract: A liquid crystal display has a light guide plate, a liquid crystal panel disposed on the light guide plate, a frame having a compartment for containing the light guide plate and a frame wall having an opening and a light bar cavity, and a light bar buried in the light bar cavity via the opening.Type: ApplicationFiled: September 21, 2006Publication date: March 27, 2008Inventor: Chih-Li Chang
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Publication number: 20070236634Abstract: A liquid crystal display module with backlight module providing an enhancement coefficient of the brightness enhancement film (BEF) within the range of 0.1 to 0.5. The backlight module is disposed behind the display panel and comprises a bottom diffuser, a brightness enhancement film, and a top diffuser disposed on the brightness enhancement film. A set of polarizers is disposed above and below the liquid crystal display panel. The backlight module meets TCO standards and has improved optical performance.Type: ApplicationFiled: April 7, 2006Publication date: October 11, 2007Inventors: Chih-Li Chang, Hung-Chen Kao, Wei-Chi Lin, Jia-Rung Juang
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Publication number: 20070171186Abstract: A cut filter is used in a backlight module or a display device and positioned over the light source to filter off a part of the light comprising an overlap of at least two of the red light, the green light, and the blue light. By filtering off the overlapping part of light emitted from the light source to obtain a purer primary color light, the display device equipped with a conventional color filter can attain an improved color gamut.Type: ApplicationFiled: January 26, 2006Publication date: July 26, 2007Inventors: Chih-Li Chang, Chi-Jen Huang, Hung-Chen Kao, Ching-Cherng Sun, Cheng-Chung Lee
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Patent number: 7163315Abstract: According to the backlight module in the present invention, a plurality of reflective members is used in this module to reflect light from lamps. Each lamp is arranged between any two adjacent reflective members. These reflective members are respectively arranged between any two adjacent lamps. The reflective members can concentrate the light to avoid the generation of shadows in specific regions on the LCD panel.Type: GrantFiled: August 6, 2004Date of Patent: January 16, 2007Assignee: HannStar Display CorporationInventors: Chih-Li Chang, Yung-Li Huang
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Publication number: 20060285311Abstract: A light-emitting device comprises at least one light source to emit a light and a transparent cap positioned over the light source. The transparent cap has a tapered interior for receiving and refracting the light from the light source and an exterior for refracting the light. The distance of light mixing is shortened conveniently using the light-emitting device.Type: ApplicationFiled: June 19, 2005Publication date: December 21, 2006Inventors: Chih-Li Chang, Chi-Jen Huang, Hung-Chen Kao
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Publication number: 20060215075Abstract: A backlight module of an LCD device includes a plurality of fillisters formed in a reflection sheet and each of the fillisters having a reflection surface and a symmetrical axis. A plurality of point light source generators set in the fillisters, in which lights generated by the point light source generators are reflected by the reflection surfaces of the fillisters and the reflection sheet, and a profile of the point light source generators determines a shape of the fillisters. At least one diffuser plate installed on the reflection sheet for scattering the lights generated by the point light source generators and reflected by the reflection surfaces of the fillisters and the reflection sheet, in which an air space is formed between the diffuser plate and the reflection sheet.Type: ApplicationFiled: March 23, 2005Publication date: September 28, 2006Inventors: Chi-Jen Huang, Chih-Li Chang
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Publication number: 20060209538Abstract: Backlight modules are provided. The backlight module includes a printed circuit board, a plurality of red light emitting diodes, a plurality of blue light emitting diodes, a plurality of green light emitting diodes and a plurality of white light emitting diodes. The plurality of red, blue, green and white light emitting diodes are disposed on the printed circuit board, defining a light emitting area. The plurality of white light emitting diodes is disposed at the periphery of the light emitting area. Wherein both the blue light emitting diodes include a blue light chip and the red light emitting diodes include a red light chip respectively, the green light emitting diodes include a larger green light chip or two equal sized green light chips to the blue and red light chips.Type: ApplicationFiled: April 21, 2006Publication date: September 21, 2006Applicant: Hannstar Display Corp.Inventors: Chih-Li Chang, Hung-Chen Kao
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Publication number: 20060203465Abstract: A back light source module of a liquid crystal device is provided. The back light source module includes a backplate, a light source fixture disposed on the backplate. The back light source module also includes a first light source having a first normal line and disposing on the light source fixture, a second light source having a second normal line and disposing on the light source fixture, and a third light source having a third normal line and disposing on the light source fixture. Among them, a first angle is formed between the second normal line and the first normal line, a second angle is formed between the third normal line and the first normal line, and both the first angle and the second angle are less than 90 degrees.Type: ApplicationFiled: December 1, 2005Publication date: September 14, 2006Applicant: Hannstar Display CorporationInventors: Chih-Li Chang, Hung-Chen Kao
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Publication number: 20060197888Abstract: A flat panel display includes a backlight module, a liquid crystal display panel, and a complex diffuser plate. The liquid crystal display panel is disposed on the backlight module, and the complex diffuser plate including a first and a second diffusion layers is disposed between the backlight module and the liquid crystal display panel. Furthermore, the first diffusion layer is adjacent to the liquid crystal display panel and the second diffusion layer is adjacent to the first diffusion layer. The first and the second diffusion layers have different refractive indexes, transmittances and haze values, so that optical performance of the flat panel display is improved.Type: ApplicationFiled: January 5, 2006Publication date: September 7, 2006Inventors: Chi-Jen Huang, Chih-Li Chang
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Publication number: 20060056201Abstract: Backlight modules are provided. The backlight module includes a printed circuit board, a plurality of red light emitting diode, a plurality of blue light emitting diode, a plurality of green light emitting diode and a plurality of white light emitting diode. The plurality of red, blue, green and white light emitting diodes are disposed on the printed circuit board, defining a light emitting area. The plurality of white light emitting diodes is disposed at the periphery of the light emitting area.Type: ApplicationFiled: November 17, 2004Publication date: March 16, 2006Inventors: Chih-Li Chang, Hung-Chen Kao
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Publication number: 20050275767Abstract: A flat panel display including a backlight module, a liquid crystal display panel, and a brightness enhancement diffuser plate (BEDP) is provided. The liquid crystal display panel is disposed on the backlight module, and the BEDP is disposed between the backlight module and the liquid crystal display panel. Furthermore, the BEDP includes a first and a second diffusion layers embedded to each other, wherein the first diffusion layer is disposed near the liquid crystal display panel, the second diffusion layer is disposed near the backlight module, and the first and the second diffusion layers have different refractive indexes, transmittances and haze values, so that optical performance of the flat panel display is optimized.Type: ApplicationFiled: January 20, 2005Publication date: December 15, 2005Inventors: Chi-Jen Huang, Chih-Li Chang
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Publication number: 20050168969Abstract: According to the backlight module in the present invention, a plurality of reflective members is used in this module to reflect light from lamps. Each lamp is arranged between any two adjacent reflective members. These reflective members are respectively arranged between any two adjacent lamps. The reflective members can concentrate the light to avoid the generation of shadows in specific regions on the LCD panel.Type: ApplicationFiled: August 6, 2004Publication date: August 4, 2005Inventors: Chih-Li Chang, Yung-Li Huang
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Patent number: 5083629Abstract: An automatic working machine which moves forward and turns back with a pre-determined shifted displacement to perform a task in a back and forth manner. The machine comprises sensors for detecting the boundaries of a defined area. The machine moves forward until the sensors detect a boundary or until a specific distance has been traveled, then the machine turns and proceeds forward in the opposite direction. The machine continues to perform in the specific back and forth motion until the task is completed.Type: GrantFiled: March 12, 1990Date of Patent: January 28, 1992Assignee: Industrial Technology Research InstituteInventor: Chih-Li Chang
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Patent number: 4919224Abstract: An automatic working vehicular system comprises a guiding signal device and an automatic working vehicle which has a power source, driving devices, detecting devices and control devices. By means of a guide wire device for limiting the operational area, the vehicle can start at a preset time, travel from a position in a garage to a specific operation site, complete the required range of operation along a parallel reciprocating course of travel, and return to the garage. The vehicle also comprises devices to control the garage door, detect the fuel level, return itself to the garage when raining, adapt to load variations, change speed automatically, warn moving obstacles, detour obstacles, and prevent its theft.Type: GrantFiled: May 9, 1988Date of Patent: April 24, 1990Assignee: Industrial Technology Research InstituteInventors: Jia-Ming Shyu, Chih-Li Chang