Abstract:
A character display module comprises a character organic light emitting diode panel, a printed circuit which is electrically connected to the character organic light emitting diode panel, a drive controller which is disposed on the printed circuit board to drive and control the character organic light emitting diode panel, and a frame which is used to position the character organic light emitting diode panel on the printed circuit board. Therefore, such an arrangement provides a lighter, thinner, high quality, cost-saving and energy-saving character display module.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a display module; and more particularly to a character organic light emitting diode display module. 
         [0003]    2. Description of the Prior Art 
         [0004]    Liquid crystal display (LCD) is considered to be the mainstream of flat panel display (FPD). Although the LCD is widely used, the LCD panel must use a backlight module as a light source, and enough space must be reserved on the LCD for installation of the backlight module, thus increasing the thickness and weight of the LCD. In addition, the backlight module causes additional power consumption while increasing cost. The existing LCDs all suffer from the disadvantages of narrow viewing angle and low response speed, which are likely to induce image sticking problem. 
         [0005]    The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
       SUMMARY OF THE INVENTION 
       [0006]    The primary objective of the present invention is to provide a character organic light emitting diode display module, which can save cost and space because of no need for backlight module, and can further save energy due to direct photoelectric conversion, and can improve the image quality and response speed, wide the viewing angle, and enhance contrast so as to wide the application range by means of a character organic light emitting diode panel. 
         [0007]    The secondary objective of the present invention is to provide a character organic light emitting diode display module, which comprises a character generator read-only memory, a character generator random-access memory, a reset integrated circuit, and a power supplying circuit. The character generator read-only memory is interiorly provided with a multi-language character database, and the character generator random-access memory is interiorly provided with a plotting function. The reset integrated circuit is employed to provide a reset function. The power supplying circuit is employed to supply a working power. Such an arrangement can improve drive convenience and perfect functions. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is an exploded of a character display module in accordance with the present invention; 
           [0009]      FIG. 2  is a perspective view of the character display module in accordance with the present invention; 
           [0010]      FIG. 3  is a block diagram showing how a drive controller cooperates with a character organic light emitting diode panel in accordance with the present invention; 
           [0011]      FIG. 4  is a first combination view of a printed circuit board and a frame in accordance with the present invention; 
           [0012]      FIG. 5  is a second combination view of the printed circuit board and the frame in accordance with the present invention; 
           [0013]      FIG. 6  is a cross-sectional view of the character display module in accordance with the present invention; and 
           [0014]      FIG. 7  is an operative view of the character organic light emitting diode panel in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0015]    The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention. 
         [0016]      FIGS. 1-7  show a character display module in accordance with a preferred embodiment of the present invention. 
         [0017]    Referring to  FIGS. 1-5 , the character display module in accordance with the present invention comprises a character organic light emitting diode panel  10 , a polarizing film  20 , a printed circuit board  30 , a drive controller  40 , two conductive components  50 , and a frame  60 . 
         [0018]    The organic light emitting diode panel  10  is of 5×8 or 5×10 (preferably 5×8) dot-matrix display, wherein each character consists of 5×8 or 5×10 dots. The characters of the organic light emitting diode panel  10  are arranged in an array ranging: from 4(rows)×1(column)-100×1 to 4×10-100×10, preferably 8×1, 8×2, 16×1, 16×1, 16×2, 16×4, 20×1, 20×2, 20×4, 40×1, 40×1, 40×2 or 40×4. 
         [0019]    The organic light emitting diode panel  10  has a thickness between 0.4 mm and 5 mm, preferably 0.4 mm, 0.5mm, 0.55 mm, 0.7mm, 1.0 mm, 1.1 mm, 1.4 mm or 2.0 mm, a chromaticity coordinate of X: from 0.1 to 0.8 and Y: from 0.1 to 0.8, a luminous efficiency ranging from 0.65 to 65 lm/W, and a service life from 20 k to 2000 k hours and more. 
         [0020]    The organic light emitting diode panel  10  is oppositely provided with a first connecting portion  11  and a second connecting portion  12 . 
         [0021]    As compared to the character LCD panel, the character organic light emitting diode panel  10  has the following advantages: 
         [0022]    1. Self-luminous: the character organic light emitting diode panel  10  is a photoelectric component to convert electric energy into light. 
         [0023]    2. Direct-current low voltage drive (lower than 16 v). 
         [0024]    3. High power efficiency: only the self-luminous pixels consume electric power, so that the power consumption of the character organic light emitting diode panel  10  is lower than the cathode ray tube (CRT) and the thin film transistor liquid crystal display (TFT-LCD), and since the character organic light emitting diode panel  10  is a self-luminous component, there is no need for the backlight module with high power consumption disadvantage, thus further saving electric power. 
         [0025]    4. High brightness: high quality image with the features of the CRT and the TFT-LCD, the brightness exceeds 100000 cd/m 2 , and in a low brightness environment, 5 cd/m 2  is bright enough to clearly display the information. 
         [0026]    5. Fast response time: the unit of the response time of the character organic light emitting diode panel  10  is expressed in μsec, the unit of the response time of the LCD is expressed in msec and the response time of the character organic light emitting diode panel  10  of the present invention is over 1000 times faster than the response time of TFT-LCD, which is 50 msec, and the response time of super twisted nematic liquid crystal display, which is 100 msec, thus making the image tend to be more true. 
         [0027]    6. Light weight &amp; slime: since the backlight module is unneeded, the thickness of the panel can be reduced to be smaller than 2 mm. 
         [0028]    7. High reliability: with the brightness of 100 cd/m 2 , the character organic light emitting diode panel  10  of the present invention has a service life longer than 100000 hrs, and due to simple configuration, the character organic light emitting diode panel  10  of the present invention is more durable, thus being applicable to the field of high impact and great temperature change. 
         [0029]    8. Full viewing angle: the upper, lower, left and right viewing angles are all more than 175 degrees. 
         [0030]    9. Excellent uniformity. 
         [0031]    10. High effective contrast ratio. 
         [0032]    The polarizing film  20  is a 1/10-to-½ (preferably  1 / 4 ) wavelength type film, namely the wavelength of the light passing through the polarizing film  20  is from 1/10 to ½ of the wavelength of the light entering the polarizing film  20 , and the wavelength of the light entering the polarizing film  20  ranges from 400 nm to 700 nm. The polarizing film  20  is disposed on a light emission path of the character organic light emitting diode panel  10 , thus improving the contrast ratio of the character organic light emitting diode panel  10 , and further utilizing the polarizing film  20  with different wave lengths to filter light to change the emitting color. 
         [0033]    The thickness of the printed circuit board  30  ranges from 0.2 mm to 10 mm (preferably, 0.4 mm, 0.6 mm. 0.8 mm, 1.0 mm or 1.6 mm). 
         [0034]    The printed circuit board  30  is oppositely provided on one side thereof with a first assembling portion  31  and a second assembling portion  32 . The first assembling portion  31  is defined with three insertion holes  311  and a through hole  312 , and the second assembling portion  32  is also defined with three insertion holes  321  and a through hole  322  corresponding to the first assembling portion  31 . The first assembling portion  31  is provided at an inner side thereof with a first connecting portion  33  in alignment with the first connecting portion  11  of the character organic light emitting diode panel  10 , and the second assembling portion  32  is provided with at an inner side thereof with a second connecting portion  34  in alignment with the second connecting portion  12  of the character organic light emitting diode panel  10 . The printed circuit board  30  is electrically connected to a resistor which is used to adjust the brightness, the power consumption (limiting current and improving voltage conversion efficiency can reduce the power consumption), and the pre-charging time. 
         [0035]    Referring to  FIG. 3 , the drive controller  40  includes a panel control unit  41  and a panel drive unit  42 . 
         [0036]    The panel control unit  41  is provided with a micro control integrated circuit  411 , a character generator read-only memory  412 , a character generator random-access memory  413  and a reset integrated circuit  414 . The micro control integrated circuit  411  includes a 4/8-bit 6800/8080-series parallel interface or serial interface. The character generator read-only memory  412  is electrically connected to the micro control integrated circuit  411  and interiorly provided with a 64×8 bit multi-language character database. The character generator random-access memory  413  is electrically connected to the micro control integrated circuit  411  and interiorly provided with a 100×16 plotting function. The reset integrated circuit  414  is electrically connected to the micro control integrated circuit  411  to provide a reset function. 
         [0037]    The resolution of the panel drive unit  42  is set to 5×8 or 5×10 correspondingly to the character organic light emitting diode panel  10 . The panel drive unit  42  is electrically connected to the character generator read-only memory  412  and the character generator random-access memory  413 , respectively. The panel drive unit  42  is provided with a common drive circuit  421 , a section control circuit  422  which is electrically connected to the common drive circuit  421 , and a power supplying circuit  423  which is electrically connected to the section control circuit  422 . The common drive circuit  421  and the section control circuit  422  are operatively connected the character organic light emitting diode panel  10 , respectively. The power supplying circuit  423  supplies a working power to the panel drive unit  42  by means of DC/DC (direct current) conversion. 
         [0038]    The respective conductive components  50  are made of a liquid, solid or colloid elastic conductive material (preferably conductive rubber, silver adhesive, carbon powder, anisotropic conductive film, or flexible flat cable). The respective conductive components  50  are disposed between the character organic light emitting diode panel  10  and the printed circuit board  30  in such a manner that one of the two conductive components  50  is abuttingly connected to the first connecting portion  33  of the printed circuit board  30  and the first connecting portion  11  of the character organic light emitting diode panel  10 , and the other of the two conductive components  50  is abuttingly connected to the second connecting portion  34  of the printed circuit board  30  and the second connecting portion  12  of the character organic light emitting diode panel  10 , so that the character organic light emitting diode panel  10  can be controlled and driven by the drive controller  40 . 
         [0039]    The frame  60  is made of metal (iron or stainless steel) or non-metal. The frame  60  is provided at both sides thereof with a first positioning portion  61  in alignment with the first assembling portion  31  of the printed circuit board  30 , and a second positioning portion  62  in alignment with the second assembling portion  32  of the printed circuit board  30 . The first positioning portion  61  is provided with four positioning protrusions  611 , three of which each include a flexible end  612 , and the second positioning portion  62  is provided with four positioning protrusions  621 , three of which each include a flexible end  622 . The positioning protrusions  611  of the first positioning portion  61  can be inserted into the insertion holes  311  and the through hole  312  of the first assembling portion  31  and engaged to the printed circuit board  30  by the flexible ends  612 , and the second positioning protrusions  621  of the second positioning portion  62  can be inserted into the insertion holes  321  and the through hole  322  of the second assembling portion  32  and engaged to the printed circuit board  30  by the flexible ends  622 , so that the character organic light emitting diode panel  10  can be positioned on the printed circuit board  30  by the frame  60 . 
         [0040]    While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.