Patent Publication Number: US-9420364-B2

Title: Display device with sound generation regions having different areas

Description:
FIELD 
     The subject matter herein generally relates to display devices, and particularly to a display device having a sound generation structure. 
     BACKGROUND 
     Nowadays, most electrical devices, for example cell phones, tablet computers, and MP 3  players, include internal speakers. The speakers generally apply vibration diaphragms to vibrate, so as to generate sound waves. However, the electrical devices have variable internal structures, and the speakers with the vibration diaphragms can be bulky. As such, the speakers with the vibration diaphragms may not be easily received in the variable internal structures. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures, wherein: 
         FIG. 1  is an isometric view illustrating an embodiment of an electrical device. 
         FIG. 2  is a cross-sectional view illustrating the electrical device, taken along line II-II of  FIG. 1 . 
         FIG. 3  is a block diagram illustrating the electrical device of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features. The description is not to be considered as limiting the scope of the embodiments described herein. 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “substantially” is defined to be essentially conforming to the particular dimension, shape or other word that substantially modifies, such that the component need not be exact. For example, substantially cylindrical means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like. 
     Referring to  FIGS. 1-2 , an embodiment of a display device  1  is shown. The display device  1  can be used in an electrical device  100 . The electrical device  100  can be a mobile phone, a tablet computer, or music player. The display device  1  includes a display panel  10 , a housing  20 , a vibration glass layer  30 , a fastening frame  40 , and a protective glass  50 . The protective glass  50  is fixed to the housing  20 . The protective glass  50  and the housing  20  cooperatively defines a receiving cavity  23 . The display panel  10 , the vibration glass layer  30 , and the fastening frame  40  are received in the receiving cavity  23 . In one embodiment, the display panel  10  is a touch panel. 
     The housing  20  includes a back cover  21  and a front frame  22 . The protective glass  50  is fixed to the front frame  22 . The display panel  10  is positioned on the back cover  21 . The front frame  22  can be made of metal material and the back cover  21  can be made of plastic material, wood material or ceramic material. 
     The vibration glass layer  30  is positioned between the display panel  10  and the protective glass  50 . The vibration glass layer  30  includes a transparent portion  31  and a sound generation portion  32 . The transparent portion  31  is positioned on the display panel  10 . The sound generation portion  32  extends from sides of the transparent portion  31  to the front frame  22 . 
     The fastening frame  40  is positioned on the vibration glass layer  30  and positioned between the vibration glass layer  30  and the protective glass  50 . In one embodiment, the fastening frame  40  is attached on the vibration glass layer  30  through adhesive. The fastening frame  40  is made of metal material or plastic material. The fastening frame  40  includes a base portion  41  and a plurality of rib portions  42 . The base portion  41  is surrounding the transparent portion  31 . The rib portions  42  extend from the base portion  41  to the front frame  22 . 
     In the illustrated embodiment, the plurality of rib portions  42  includes four rib portions  42 . The four rib portions  42  divide the sound generation portion  32  into five sound generation regions  320 . The five sound generation regions  320  are independent from each other and have different areas. Each sound generation region  320  is corresponding to a respective frequency response range. The sound generation region  320  having a greater area is corresponding to a lower frequency response range. The sound generation region  320  having a smaller area is corresponding to a higher frequency response range. In details, the five sound generation regions  320  include one biggest sound generation region  3202 , two middle sound generation regions  3204 , and two smallest sound generation regions  3206 . The biggest sound generation region  3202  is corresponding to a frequency response range of 200 Hz-2 kHz. The two middle sound generation regions  3204  are corresponding to a frequency response range of 2 kHz-20 kHz. The two smallest sound generation regions  3206  are corresponding to a frequency response range greater than 20 kHz. 
     The base portion  41  includes a filling layer  410 . The filling layer  410  is filled with glass material and configured to fill a gap defined between the transparent portion  31  and the protective glass  50 . In other embodiments, the filling layer  410  can be molded integrally with the protective glass  50 . 
     Each sound generation region  320  is connected to an oscillator  322 . The oscillator  33  is positioned on a central portion of each sound generation region  320 . 
     The sound generation portion  32 , the display panel  10 , and the back cover  21  cooperatively define resonance cavities  300 . When one sound generation region  320  is vibrating, sound pressure generates at two sides of the vibration glass layer  30  and the resonance cavities  300  amplify the sound pressure. In the illustrated embodiment, each sound generation region  320  defines a through hole  321 . The through hole  321  is in communication with a respective one of the resonance cavities  300  and configured to balance the pressure of exterior and interior of the respective resonance cavity  300 . 
     Referring to  FIG. 3 , the electrical device  100  includes the display device  1 , a processer  101 , an A/D converter  102 , an audio amplifier  103 , and a woofer  104 . The processer converts an audio signal from the electrical device  100  into a mechanical vibration signal. The A/D converter converts the mechanical vibration signal into an analogical signal. The audio amplifier  102  amplifies the analogical signal. The oscillator  322  receives the amplified analogical signal and vibrates the sound generation region  320 , such that the sound generation region  320  generates sound wave. 
     The woofer  104  is positioned on the front frame  22  and is close to a side of the transparent portion  31  where there is no sound generation portion  32 . The woofer  104  works in a frequency response range less than 200 Hz and is configured to produce a low frequency sound less than 200 Hz for the electrical device  100 . 
     The embodiments shown and described above are only examples. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including, the full extent established by the broad general meaning of the terms used in the claims.