Light source portion for backlight module, backlight module using the same, and connection structure of backlight module
a technology of backlight module and light source portion, which is applied in the direction of lighting and heating apparatus, mechanical equipment, instruments, etc., can solve the problems of reducing the thickness of the backlight module and hence the size of portable equipment, limiting the reduction and the rigidity of the light source portion circuit board b
Inactive Publication Date: 2005-07-28
ROHM CO LTD
View PDF3 Cites 15 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Hence, there is a limit to a reduction of the light source portion 2 in thickness, which makes it impossible to reduce the backlight module in thickness and hence the portable equipment in size.
However, for example, when the light source portion circuit board 21 is made as thin as 0.15 to 0.2 mm, the rigidity of the light source portion circuit board 21 is deteriorated considerably, and it becomes difficult to handle the light source portion circuit board 21 when the light source portion 2 is assembled.
In other words, a special jig has to be used to maintain the shape of the light source portion circuit board 21, which complicates the assembly work of the light source portion 2.
As a result, the productivity is reduced.
However, increasing an area of the mounting circuit board 3 is not acceptable particularly in portable equipment with which a reduction in size is a crucial problem.
In addition, according to the connection structure using a connector or a solder joint, it takes time to assemble a backlight module; moreover, the backlight module cannot be assembled automatically.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049]FIG. 1 is an exploded perspective view showing an arrangement of a cellular phone as an example of portable electronic equipment to which a backlight module according to one embodiment of the invention is applied. The cellular phone includes a mounting circuit board 4, a backlight module 5 that emits light upon feeding of electricity from the mounting circuit board 4, a liquid crystal display panel 6 superposed on the backlight module 5, and a front cover 7. The front cover 7 is provided with a display window 7A, and the liquid crystal display panel 6 is placed in accordance with the display window 7A.
[0050] The mounting circuit board 4 is provided with electronic components forming circuits that perform control related to telephone calls and transmission of incoming and outgoing electronic mails, display control of the liquid crystal display panel 6, and control of the feeding of electricity to the backlight module 5. The mounting circuit board 4 is provided with a pair of f...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| brightness | aaaaa | aaaaa |
Login to View More
Abstract
A light source portion for a backlight module that emits light to be incident on an end face of an optical waveguide. The light source portion includes a circuit board having a mounting surface, and a light emitting device having a lead terminal to be connected to the mounting surface of the circuit board and emitting light in a direction parallel to the circuit board. The light emitting device is mounted on the circuit board in such a manner that a plate thickness of the circuit board falls within a range of a thickness of the light emitting device.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a backlight module used to emit light from behind a liquid crystal display panel or the like and a light source portion used for the backlight module as well as a connection structure of the backlight module and a mounting circuit board. [0003] 2. Description of Related Art [0004] Generally, a backlight module for improving visibility is placed behind the liquid crystal display panel. For example, a backlight module is provided to a display portion of portable equipment, such as a cellular phone, so that satisfactory visibility is ensured in circumstances where the brightness of surroundings is insufficient (at night, for example). [0005] As shown in FIG. 8, the backlight module includes an optical waveguide 1, a light source portion 2 that emits light to be incident on the end face of the optical waveguide 1, and a mounting circuit board 3 provided behind the optical waveguide 1 and...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): F21V8/00G02F1/13357F21Y101/02G02B6/00H01L33/60
CPCG02B6/0055G02B6/009G02B6/0083G02B6/0073
Inventor OSAWA, HIDEHARU
Owner ROHM CO LTD