News Column

Patent Issued for Touch Display Device

May 7, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- A patent by the inventors Chien, Chih-Wei (Taoyuan County, TW); Tsai, Shau-Yu (Taipei, TW), filed on January 13, 2011, was published online on April 22, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8704802 is assigned to Au Optronics Corporation (Hsinchu, TW).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The invention relates to a touch display device. More particularly, the invention relates to an optical touch display device.

"The increasing progress of display technologies brings about great conveniences to people's daily lives, and the demands for light and compact display devices contribute to the development of flat panel displays (FPDs) as mainstream displays. Among various FPDs, liquid crystal displays (LCDs) characterized by great space utilization, low power consumption, non-radiation, and low electromagnetic interference are prevailing.

"With advancement of information technology, wireless mobile communication, and information appliances, input devices of various information products including conventional key boards or mice have been replaced by touch panels in order to comply with requirements for portability, compactness, and user-friendly interfaces, and the touch panels are integrated with displays to form touch display devices. At present, the touch panels can be generally categorized into resistive touch panels, capacitive touch panels, optical touch panels, acoustic wave touch panels, electromagnetic touch panels, and so on. Since the touch-sensing mechanisms of the optical touch panels are suitable for the large-sized display panels, the display panels with large size often achieve the touch-sensing function by applying the optical touch-sensing mechanisms.

"FIG. 1A is a schematic cross-sectional view illustrating a conventional LCD. With reference to FIG. 1, the LCD 100 includes a device housing 110 and a liquid crystal display module (LCM) 120, and the LCM 120 is configured within the device housing 110. In general, the LCM 120 is formed by assembling a front bezel 121, an LCD panel 123, a frame 125, an optical thin film 127, a light guide plate 129, a backlight source 131, and a back bezel 133. However, the display surface of the LCM 120 and the surface of the device housing 110 are not at the same horizontal level, which poses a negative impact on visual effects.

"FIG. 1B is a schematic cross-sectional view illustrating a conventional touch display device. With reference to FIG. 1B, in the touch display device 101, an optical touch module 140 is configured between the device housing 110 and the LCM 120. The optical touch module 140 includes a light source 141, a photo sensor 143, and a reflector 145. However, after the optical touch module 140 is additionally formed in the touch display device 101, the level difference between the display surface 120D of the LCM 120 and the surface 110S of the device housing 110 becomes more significant, which further leads to unpleasant visual effects.

"FIG. 1C is a schematic view illustrating a back bezel in a bent state or not in a bent state in a conventional optical touch module. With reference to FIG. 1C, the optical touch module 150 includes a light source 151, a photo sensor 153, and a back bezel 155. When the back bezel 155 is not bent yet, the photo sensor 153 can receive light from the light source 151, and the light receiving range of the photo sensor 150 is between the straight line L1 and the straight line L2. After the back bezel 155 is bent, the light source 151 is located beyond the light receiving range of the photo sensor 153, such that the photo sensor 153 is unlikely to receive the light from the light source 151, and that erroneous touch points are detected."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "The invention is directed to a touch display device in which an optical touch module and a cover lid are integrated, so as to improve visual effects of the touch display device and provide optical touch-sensing functions.

"The invention provides a touch display device that includes a device housing, a display module, and an optical touch module. The display module is located within the device housing and has a display region and a peripheral region surrounding the display region. The optical touch module is configured on the display module. The optical touch module includes a light guide element, a light source, and a photo sensor. The light guide element has a top surface and includes a light guide portion located on the display region and an outer frame portion extending from an edge of the light guide portion. The outer frame portion is connected to the device housing. The light source supplies light to the light guide portion and is covered by the outer frame portion. The photo sensor receives the light from the light guide portion and is covered by the outer frame portion.

"According to an embodiment of the invention, the display module includes an LCM.

"According to an embodiment of the invention, the LCM includes a backlight source, a frame, an LCD panel, a back bezel, and a front bezel. The frame accommodates the backlight source. The LCD panel is configured on the frame and located above the backlight source. The back bezel holds the frame and the backlight source. The front bezel is assembled to the back bezel, the frame, and the LCD panel.

"According to an embodiment of the invention, the light source and the photo sensor are configured on the front bezel.

"According to an embodiment of the invention, the front bezel has a groove that accommodates the light source and the photo sensor.

"According to an embodiment of the invention, the LCM includes a backlight source, a frame, and an LCD panel. The LCD panel is configured on the frame and located above the backlight source. The frame holds and accommodates the backlight source and the LCD panel.

"According to an embodiment of the invention, the light source and the photo sensor are configured on the frame.

"According to an embodiment of the invention, the frame has a groove that accommodates the light source and the photo sensor.

"According to an embodiment of the invention, the outer frame portion extends beyond the peripheral region and extends above the device housing to connect the device housing.

"According to an embodiment of the invention, the light guide portion and the outer frame portion are integrally formed.

"According to an embodiment of the invention, a thickness of the light guide portion is greater than a thickness of the outer frame portion.

"According to an embodiment of the invention, a sidewall of the light guide portion includes a lateral light emitting surface, a lateral light incident surface, and a plurality of reflective surfaces. The light source is configured next to the lateral light incident surface. The photo sensor is configured next to the lateral light emitting surface. The optical touch module further includes a plurality of reflectors configured on the reflective surfaces, so as to reflect the light from the light source back to the lateral light emitting surface.

"According to an embodiment of the invention, the lateral light emitting surface is a plane or a curved surface.

"According to an embodiment of the invention, a sidewall of the light guide portion includes a lateral light emitting surface and at least one lateral light incident surface. The photo sensor is configured next to the lateral light emitting surface. The light source is configured next to the at least one lateral light incident surface and includes a light guide pillar and a light emitting element. Light supplied by the light emitting element is transmitted from the at least one lateral light incident surface to the light guide portion through the light guide pillar.

"According to an embodiment of the invention, the light source, the photo sensor, and the outer frame portion are configured on the peripheral, region.

"According to an embodiment of the invention, the top surface is a flat surface.

"According to an embodiment of the invention, the light guide portion covers the display region and a portion of the peripheral region.

"According to an embodiment of the invention, the device housing has a groove accommodating the light source and the photo sensor.

"Based on the above, the light guide element in the touch display device of the invention serves as the cover lid, and the light guide portion of the light guide element transmits the light supplied by the light source of the optical touch module. Thereby, visual effects of the touch display device can be improved, and erroneous operation of the optical touch module can be precluded.

"In order to make the aforementioned and other features and advantages of the invention more comprehensible, several embodiments accompanied with figures are described in detail below."

URL and more information on this patent, see: Chien, Chih-Wei; Tsai, Shau-Yu. Touch Display Device. U.S. Patent Number 8704802, filed January 13, 2011, and published online on April 22, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=64&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=3175&f=G&l=50&co1=AND&d=PTXT&s1=20140422.PD.&OS=ISD/20140422&RS=ISD/20140422

Keywords for this news article include: Electronics, Electromagnet, Au Optronics Corporation.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Electronics Newsweekly


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