CN2783370Y

CN2783370Y - Direct-lighting type backlight source

Info

Publication number: CN2783370Y
Application number: CN 200520041237
Authority: CN
Inventors: 马国恒; 姚志刚
Original assignee: Suzhou BOE Chatani Electronics Co Ltd
Current assignee: Suzhou BOE Chatani Electronics Co Ltd
Priority date: 2005-04-29
Filing date: 2005-04-29
Publication date: 2006-05-24
Anticipated expiration: 2015-04-29

Abstract

The utility model discloses a direct-lighting type backlight source which comprises a box body type backboard, a reflecting piece arranged on the inner side of the backboard, a plurality of U-shaped lamp tubes arranged horizontally in the box body type backboard, and a diffuser plate arranged above the lamp tubes. The utility model is characterized in that the utility model also comprises a plurality of brackets with the number corresponding to that of the lamp tubes, each bracket is composed of a buckling piece on the bottom part, a middle crown pillar positioned above the buckling piece, a side supporting frame which extend towards the left and the right side of the connecting part formed from the buckling piece and the middle crown pillar, the side supporting frame on each side is provided with a bayonet matched with the diameter of each lamp tube and the buckling piece is fixedly connected with the box body type backboard through a hole on the reflecting piece. The stability of the fixed lamp tubes of the utility model is enhanced, bad electrical connection between the lamp tubes and a control circuit is avoided, the diffuser plate is ensured to normally have a diffusive function and the service life of a liquid crystal display is prolonged. The utility model is especially suitable for a liquid crystal display apparatus in large size to use.

Description

Direct-light-type backlight

Technical field

The utility model relates to a kind of lighting device, is specifically related to a kind of light-source structure that illumination is provided for liquid crystal display device.

Background technology

Because liquid crystal itself does not have emitting characteristics, so liquid crystal indicator (as LCD, liquid crystal TV set etc.) need provide illumination by additional light-source structure.Usually, LCD partly comprises liquid crystal panel and backlight module two parts, and backlight module is to provide light source to liquid crystal panel, makes the normally vitals of display image of panel of LCD.

In general, backlight module can be divided into two kinds of straight-down negative and side incident types, wherein the side incident type includes a straight pipe type light source, light guide plate, reflector plate, diffusion barrier and prism film, the straight pipe type light source is located at the side end of light guide plate, light source is entered in the light guide plate by the side, utilize cooperatively interacting of reflector plate, diffusion barrier and prism film, collected light is to the design angle of visibility scope of LCD.Yet, being subjected to the restriction of light guide plate, the fluorescent tube quantity that is placed in side can't increase, and is corresponding when being used in the large scale liquid crystal display device, has the not enough phenomenon of light source deficiency and briliancy; Another kind is a straight-down negative, it includes a box body formula backboard, a plurality of fluorescent tube in the backboard and diffuser plate, blooming etc. of being flat on, because fluorescent tube is flat in the box body formula backboard, for liquid crystal panel provides light source, so the quantity of fluorescent tube can enlarge with the liquid crystal panel size and increase, so that provide sufficient light source to liquid crystal panel.

Yet increase along with the liquid crystal panel size, provide the fluorescent tube of light source also to increase thereupon, only according to the fixed form of lamp tube ends and box body formula backboard sidewall in the past, can not guarantee connection stability, especially the vibration that in the process that transportation, carrying are piled up, produces, anchorage force easily causes the loosening of fixed connection place inadequately, and the reliability that is electrically connected between the fluorescent tube that influences the junction afterwards and the control circuit causes lamp works unusual; In addition, be because the increase of liquid crystal panel equally, the also corresponding increase of diffuser plate, diffuser plate is by supporting its unsettled being arranged on the fluorescent tube around the box body, the transportation and use in easily deform, bending, the optical property of diffuser plate is changed, cause diffusion inequality backlight, even produce diffraction fringe etc., thereby on liquid crystal panel, manifest shade, cause display effect to descend.

Summary of the invention

The utility model purpose provides a kind of backlight that the large scale liquid crystal panel uses that is suitable for, and so that uniform illumination to be provided, and improves the fixing stability of fluorescent tube, increases the service life.

For achieving the above object, the technical solution adopted in the utility model is: a kind of direct-light-type backlight, it includes a box body formula backboard, be positioned at the reflector plate of backboard inboard, a plurality of diffuser plates that are flat on the U-shaped fluorescent tube in the box body formula backboard and are located at the fluorescent tube top, also include a plurality of supports corresponding with the fluorescent tube number, described support is by the fastener of bottom, be positioned at the middle fore-set of fastener top, side stay frame from the both sides expansion to the left and right of the junction of fastener and middle fore-set is formed, described every side stay frame is provided with the bayonet socket that cooperates with tube diameter, and hole and the box body formula backboard of described fastener on reflector plate is chimeric.

In the technique scheme, the left and right distribution of mid point of the relative fluorescent tube length direction of described support, the middle dot spacing of support and fluorescent tube length direction is between 50 millimeters to 80 millimeters, and adjacent stent distributes alternately in the left and right sides of fluorescent tube mid point.

In the technique scheme, be provided with the gap between the top of described fore-set and the diffuser plate, gap length is between 0.3 millimeter to 0.7 millimeter.

For obtaining better illuminating effect, preferred scheme is that the spacing of described fluorescent tube and end reflector plate is in 1 millimeter to 5 millimeters interval; The spacing of described fluorescent tube and diffuser plate bottom is in 6.8 millimeters to 16.8 millimeters intervals.

In the technique scheme, flanging obtuse angle, reflector plate front, described end angle is between 95～130 degree.

The utility model strengthens the supporting role to fluorescent tube by support is set.Though the light of the bayonet socket of support meeting partial occlusion clamping part, adjacent fluorescent tube can play compensating action to its field of illumination, and through after the diffusion of diffuser plate, whole illumination is more even; Be to guarantee the effect of compensation, distribute about can making adjacent supports staggered, and at intervals, yet if hypertelorism, support and fluorescent tube center of gravity are too big apart, the supporting role meeting is not obvious, does not also have the effect of setting off when diffuser plate is out of shape.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1. because the utility model adds support under fluorescent tube, fluorescent tube is played a supportive role, alleviates the fixation pressure of lamp tube ends, improve the fixing stability of fluorescent tube, avoid between fluorescent tube and the control circuit be electrically connected bad.

2. the fore-set in the middle of the support because of pushing or being out of shape under the situation of sinking, supports diffuser plate at diffuser plate, avoids contacting with fluorescent tube, and keeps certain distance, makes diffuser plate normally bring into play the effect of diffusion, the serviceable life of prolongation LCD.

3. owing to above-mentioned improvement, the utility model can increase the lighting area of backlight, is particularly suitable for large-sized liquid crystal indicator and uses.

Description of drawings

Accompanying drawing 1 is the structural representation (removing diffuser plate) of the utility model embodiment one;

Accompanying drawing 2 is the A-A cut-open view of Fig. 1;

Accompanying drawing 3 is the local enlarged diagram of Fig. 2.

Wherein: [1], backboard; [2], reflector plate; [3], fluorescent tube; [4], support; [5], fastener; [6], fore-set; [7], side stay frame; [8], bayonet socket; [9], diffuser plate.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: shown in accompanying drawing 1 to 3, a kind of direct-light-type backlight, it includes a box body formula backboard 1, be positioned at the reflector plate 2 of backboard 1 inboard, a plurality of diffuser plates 9 that are flat on the U-shaped fluorescent tube 3 in the box body formula backboard 1 and are located at fluorescent tube 3 tops, also include a plurality of supports 4 corresponding with the fluorescent tube number, described backboard 1 can adopt the aluminium backboard, described support 4 is by the fastener 5 of bottom, be positioned at the middle fore-set 6 of fastener 5 tops, form from the fastener 5 and the side stay frame 7 of the junction both sides expansion to the left and right of middle fore-set 6, described every side side stay frame 7 is provided with the bayonet socket 8 that cooperates with tube diameter, fixedlys connected with box body formula backboard 1 in the hole of described fastener 5 on reflector plate 2.The left and right distribution of mid point of described support 4 relative fluorescent tube length directions, support 4 is 50 millimeters with the middle dot spacing of fluorescent tube length direction, adjacent stent distributes alternately in the left and right sides of fluorescent tube mid point.Be provided with the gap between the top of described fore-set 6 and the diffuser plate 9,0.4 millimeter of gap length.

In the present embodiment, the spacing of described fluorescent tube and end reflector plate is 4 millimeters, and the spacing of described fluorescent tube and diffuser plate bottom is 8 millimeters; Flanging obtuse angle, reflector plate front, described end angle is 130 degree.

Embodiment two: a kind of direct-light-type backlight, it includes a box body formula backboard, be positioned at the reflector plate of backboard inboard, a plurality of diffuser plate that is flat on the U-shaped fluorescent tube of box body formula backboard and is located at the fluorescent tube top, also include a plurality of supports corresponding with the fluorescent tube number, described support by the fastener of bottom, be positioned at the fastener top middle fore-set, form from the side stay frame of the junction of fastener and middle fore-set both sides expansion to the left and right, described every side side stay frame is provided with the bayonet socket that cooperates with tube diameter, fixedlys connected with box body formula backboard in the hole of described fastener on reflector plate.The left and right distribution of mid point of the relative fluorescent tube length direction of described support, the middle dot spacing of support and fluorescent tube length direction is 80 millimeters, adjacent stent distributes alternately in the left and right sides of fluorescent tube mid point.Be provided with the gap between the top of described fore-set and the diffuser plate, 0.5 millimeter of gap length.

In the present embodiment, the spacing of described fluorescent tube and end reflector plate is 2 millimeters, and the spacing of described fluorescent tube and diffuser plate bottom is 15 millimeters; Flanging obtuse angle, reflector plate front, described end angle is 100 degree.

Claims

1. direct-light-type backlight, it includes a box body formula backboard [1], be positioned at the inboard reflector plate [2] of backboard [1], a plurality of diffuser plates [9] that are flat on the U-shaped fluorescent tube [3] in the box body formula backboard [1] and are located at fluorescent tube [3] top, it is characterized in that: also include a plurality of supports [4] corresponding with the fluorescent tube number, described support [4] is by the fastener [5] of bottom, be positioned at the middle fore-set [6] of fastener [5] top, form from the fastener [5] and the side stay frame [7] of the junction both sides expansion to the left and right of middle fore-set [6], described every side stay frame [7] is provided with the bayonet socket [8] that cooperates with tube diameter, and hole and the box body formula backboard [1] of described fastener [5] on reflector plate [2] is chimeric.

2. direct-light-type backlight according to claim 1, it is characterized in that: described support [4] is the left and right distribution of mid point of fluorescent tube [3] length direction relatively, the middle dot spacing of support [4] and fluorescent tube [3] length direction is between 50 millimeters to 80 millimeters, and adjacent stent [4] distributes alternately in the left and right sides of fluorescent tube [3] mid point.

3. direct-light-type backlight according to claim 1 is characterized in that: be provided with the gap between the top of described fore-set [6] and the diffuser plate, gap length is between 0.3 millimeter to 0.7 millimeter.

4. direct-light-type backlight according to claim 1 is characterized in that: the spacing of described fluorescent tube [3] and end reflector plate [2] is in 1 millimeter to 5 millimeters interval.

5. direct-light-type backlight according to claim 1 is characterized in that: the spacing of described fluorescent tube and diffuser plate bottom is in 6.8 millimeters to 16.8 millimeters intervals.

6. direct-light-type backlight according to claim 1 is characterized in that: flanging obtuse angle, reflector plate front, described end angle is between 95～130 degree.