WO2012064116A2

WO2012064116A2 - Test tray for testing light-emitting diodes

Info

Publication number: WO2012064116A2
Application number: PCT/KR2011/008542
Authority: WO
Inventors: 이기현; 심규열; 홍성민; 방지원; 임정호; 송준성
Original assignee: 강우테크 주식회사
Priority date: 2010-11-10
Filing date: 2011-11-10
Publication date: 2012-05-18
Also published as: WO2012064116A3; KR101030033B1

Abstract

The present invention relates to a test tray for testing light-emitting diodes (hereinafter, referred to as "LEDs"), which enables a plurality of LEDs to be mounted simultaneously in the test tray and tested while moving between processes in a final process that automatically tests the performance of LEDs produced in a manufacturing process. A plurality of produced LEDs (approximately 60 to 240 LEDs) are placed into a main body of the test tray such that the lenses of the LEDs are exposed downwardly via respective through-holes communicating with respective insertion spaces, and an optical test is accurately performed while safely protecting the lenses when transferring the LEDs between processes. To this end, a plurality of insertion spaces (18) for accommodating LEDs (1) are formed in the upper surface of a main body (17) of a test tray (16) for testing LEDs (1), and through-holes (19) communicating with the bottom of the main body (17) are formed in the bottoms of the respective insertion spaces (18) such that a test on LEDs (1) can be performed with the lenses (L) of the LEDs (1) accommodated in the respective insertion spaces (18) being exposed downwardly via the through-holes (19).

Description

Test tray for LED test

The present invention is equipped with a plurality of LEDs in the final process to automatically test the performance of the LED produced in the manufacturing process (hereinafter referred to as "LED") at the same time the test tray for the LED test to perform the test while moving between processes ( test tray).

Recently, researches on flat panel displays have been actively conducted. The flat panel displays include a liquid crystal display device (LCD), a field emission display device (FED), an electro-luminescence display device (ELD), and a PDP. (Plasma Display Panels).

Among these, liquid crystal display devices have a large contrast ratio, are suitable for gray scale display or moving image display, and have low power consumption. Therefore, the area of the liquid crystal display device is gradually expanding to notebook PCs, desktop monitors, and liquid crystal TVs.

However, since the liquid crystal display itself is non-luminous, it requires a separate external light source for irradiating light.

In particular, in the case of a transmissive liquid crystal display, a back light, which is a separate dimming device for emitting and guiding light on the back of the LCD panel, is necessarily required.

The backlight is divided into an edge type and a direct type according to a method of projecting light.

Among these, the edge type backlight is provided with a tubular light emitting lamp (hot cathode or cold cathode) on the side of the liquid crystal panel, and uses a transparent light guide plate to project the light from the light emitting lamp to be uniformly distributed over the entire liquid crystal panel screen. The direct type backlight is a method in which light from a light emitting lamp selectively mounted on a lower portion of the liquid crystal panel is diffused by a convincing sheet provided between the light emitting lamp and the liquid crystal panel and distributed throughout the liquid crystal panel screen.

However, the edge type backlight uses a hot cathode fluorescent lamp or a cold cathode fluorescent lamp, so that the thickness of the backlight is not only high, but the lifetime of the fluorescent lamp is short and power consumption is large. Edge type backlights are drawing attention.

In particular, in the case of a notebook backlight unit, the demand for LEDs is increasing as a backlight light source of a liquid crystal display device due to advantages such as low power, high lifespan, and miniaturization.

The LED array used as a light source of the edge type backlight for a liquid crystal display device is a plurality of light emitting diodes arranged in a row on a flexible printed circuit board (FPCB), and the plurality of light emitting diodes emit light from the plurality of light emitting diodes. Light is fastened to the backlight unit to be incident on one side of the light guide plate.

As shown in FIG. 1, the backlight LED array of the liquid crystal display device may improve the image quality of the liquid crystal display device only when light of a constant brightness is emitted from the lens L of each LED 1, which is a light emitting diode. Therefore, in order to apply the LED array to the backlight of the liquid crystal display, it is necessary to inspect the optical characteristics through the lens L as well as the electrical characteristics of the produced LED 1. .

Figure 2 is a longitudinal cross-sectional view for explaining a conventional LED test method, Figure 3 is a plan view of Figure 2 and Figures 4a to 4e is a process diagram for explaining the operating state according to the test of the LED, the finished LED (1) is The LED feeder 10 is provided on one side of a bowl feeder (not shown) packed in a bulk type, and the LEDs are sequentially transferred when the finished LEDs are randomly contained in the bowl feeder. It moves to the tester side (not shown) via the apparatus 10 and sorts the good and defective items.

The LED conveying apparatus 10 which transfers the LED which escaped from the bowl feeder to the tester side in this way is the linear feeder 8 which has the supply path 9 which supplies LED1a, 1b, 1c on a straight line, The turntable 2 provided on the outer circumference of the LED housing recess 2a, which is installed at one side of the linear feeder 8 and accommodates the

LEDs

1a, 1b and 1c supplied from the linear feeder 8, is provided on the outer periphery. Consists of.

The straight feeder 8 and the turntable 2 are respectively arranged on the base 11, and the recesses 2a of the straight feeder 8 and the turntable 2 are covered by the cover 12. As shown in FIG.

In addition, a suction port for sucking

LEDs

1a, 1b and 1c supplied from the straight feeder 8 into the recess 2a of the turntable 2 to the base 11 positioned below the turntable 2. (4) is provided, and the suction port 4 is always kept in a vacuum state by a vacuum apparatus (not shown).

In addition, the base 11 positioned below the supply passage 9 formed in the straight feeder 8 has a stopper 3 for controlling the transfer of the LED 1a positioned at the top of the LEDs positioned in the supply passage 9. ) Is installed so as to move up and down, and the separator pin (5) for pushing and stopping the LED (1b) located in the second position to the cover (12) located at the upper part of the supply path (9) is installed so as to move up and down. In the vicinity of the separator pin 5, the push pin 7 for pressing the third position LED 1c in the supply path 9 toward the front (second LED 1b side) and stopping the light is stopped. It is installed so that you can move back and forth in the photo state.

On the other hand, between the supply path 9 and the turntable 2, the passage of the

LEDs

1a, 1b and 1c is detected and the drive control device 15 stops the stopper 3, the separator pin 5 and the push. A light transmitting portion 6a and a light receiving portion 6b are provided to control the operation of the pin 7. The light transmitting portion 6a is provided on the base 11 side, and the light receiving portion 6b is a cover 12. It is installed on the side.

Therefore, as described above, when the finished LED (1) is put into the bowl Peter as a bulk type (bulk type) and the bowl feeder is operated, the LEDs randomly contained in the bowl feeder are aligned in a constant direction to supply the LED conveying apparatus 10. Transferred to the furnace (9).

When the

LEDs

1a, 1b, and 1c to be tested are transferred through the supply path 9 in turn, the stopper 3 is moved from the base 11 to the supply path 9 side by the drive control device 15. The protruding LED 1a positioned at the top end is caught by the stopper 3, and the transfer is stopped. At this time, even if the vacuum is continuously applied to the suction port 4, the LED 1a at the top end is stopped. ) Is not supplied to the turntable 2 side.

As described above, in the process of supplying the LED to be tested through the supply path 9, the separator pin 5 and the push pin 7 are located at the top dead center, and the LED 1a positioned at the top is shown in FIG. 4A. As shown in FIG. 3, when the light receiving part 6a and the light receiving part 6b detect the same and the separator pin 5 is lowered by the drive control device 15 to hold the LED 1b positioned secondly. Done.

Then, as shown in FIG. 4B, when the stopper 3 descends to the base 11 side by the drive control device 15, the LED 1a, which is located at the uppermost end, is attracted by the suction port 4 Is sucked by the turntable 2 side, and is accommodated in the recessed part 2a.

When the LED 1a at the uppermost end is received in the recess 2a of the turntable 2, the light emitted from the light transmitting part 6a is received by the light receiving part 6b and sent to the drive control device 15. Therefore, the drive control device 15 determines that the LED 1a at the uppermost end is accommodated in the recess 2a and rotates the turntable 2 by one pitch.

After the turntable 2 rotates one pitch as described above, the stopper 3 is protruded again by the drive control device 15 to the supply path 9 as shown in FIG. 4C, and then the drive control device 15 as shown in FIG. 4D. The separator pin 5 is pulled into the cover 12 side to release the latch of the LED 1b located at the second position. In this case, the LED 1b floats due to the vacuum pressure, causing the separator pin 5 to rise. Since it is attached to the bottom of the), it can not be separated from the separator pin (5).

In this state, as shown in FIG. 4E, when the push pin 7 pushes the LED 1c on the third position to the LED 1b side on the second position by the drive control device 15, the LED located on the third position ( Since 1c is pushed to the turntable 2 side by the LED 1b which is 2nd-positioned, the 2nd-positioned LED 1b is isolate | separated from the separator pin 5 and at the same time by the suction force from the suction port 4 It is sent to the side (2) and caught by the stopper 3, whereby the LED can be continuously stored in the recess 2a of the turntable 2 by the above-described operation.

As the LED 1 to be tested is sequentially stored in the recess 2a of the turntable 2, the turntable 2 rotates and moves toward the test unit (not shown). In addition to the electrical characteristics, the optical characteristics of the lens are tested to determine whether they are good or bad.

However, the test method of the LED using such a conventional device has a number of problems as follows.

First, the LED with the lens is randomly placed in the bowl feeder to be moved to the supply path by vibration, so that the lens is hit by another LED or is scratched, causing scratches on the lens. Has a defect.

Second, the LEDs transferred through the supply path are pressed to the separator pins and the push pins to control or separate the transfers, thereby causing a risk of damaging the lens positioned above the LEDs.

Third, the LED is transferred by the vacuum pressure acting through the suction port, so that the LED hits the recess or the stopper during the transfer of the LED, causing damage to the LED, thereby deteriorating the electrical characteristics.

Fourth, in the process of testing the optical characteristics of the LED is to emit light in the state that the lens is exposed to the outside, the light emitted is not focused and diffused to the outside, the quality of the optical test is deteriorated.

The present invention has been made in order to solve such a conventional problem, by placing a plurality of (about 60 to 240) LEDs produced in the main body of the test tray through the through-hole formed through the lens insertion space The objective is to ensure accurate optical testing while protecting the lens in the process of transferring it to the lower part and transferring it between processes.

According to an aspect of the present invention for achieving the above object, in the test tray for the LED test formed with a plurality of insertion spaces containing the LED on the upper surface of the body, by forming a through hole through the bottom of the respective insertion spaces A test tray for LED testing is provided, wherein the LED is tested in a state in which the lens of the LED contained in the insertion space is exposed downward through the through hole.

The present invention has several advantages over the conventional method as follows.

First, since several LEDs are put in a test tray and tested by the test unit, it is possible to fundamentally solve a phenomenon in which scratches are generated on the lenses of the LEDs.

Second, since the LED is safely transferred to the test tray between processes, damage to the lens as well as damage due to the LED transfer is prevented.

Third, in the process of testing the optical characteristics of the LED is condensed through the hole formed to be through the insertion space and is not diffused to the outside can improve the quality of the optical test.

1 is a perspective view showing the structure of a typical LED

Figure 2 is a longitudinal cross-sectional view for explaining a conventional LED test method

3 is a plan view of FIG.

4a to 4e is a process chart for explaining the operating state according to the test of the LED

5 is a perspective view showing the structure of a test tray of the present invention;

6 is a bottom perspective view of FIG.

Figure 7 is a longitudinal cross-sectional view of the LED is contained in the test tray of the present invention

8 is a perspective view showing a customer tray for loading or unloading an LED to be tested in a test tray of the present invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 5 to 8 as an embodiment.

Figure 5 is a perspective view showing the structure of the test tray of the present invention, Figure 6 is a bottom perspective view of Figure 5 and Figure 7 is a longitudinal cross-sectional view of the LED contained in the test tray of the present invention, the present invention is a test tray 16 There is a plurality of insertion spaces 18 into which the LEDs 1 are contained on the upper surface of the main body 17, and a through hole 19 through the lower portion is formed on the bottom of each of the insertion spaces 18. When the LED 1 is contained in the space 18, the lens L of the LED 1 is exposed to the lower portion through the through hole 19 so that the test of the LED 1 is performed.

The through hole 19 formed to pass through the insertion space 18 formed in the main body 17 is the lens L formed in the LED 1 when the lens L is inserted into the insertion space 18 so as to face downward. ) May be exposed downward through the through hole 19, but it is more preferable to form a vertically lowered inclined surface 19a and a vertical surface 19b perpendicular to the inclined surface.

This means that when the light is emitted from the lens L during the optical test process of the LED 1, the emitted light is diffused to the vertically lowered inclined surface 19a and condensed by the vertical surface 19b. It is to help improve the quality of the.

However, it is understood that the through hole 19 may be applied only to the upper and lower sloped slopes 19a as necessary.

On the other hand, the test portion of the tester by directly containing the LED (1) so that the lens (L) is exposed to the lower portion through the through hole 19 to the insertion space 18 formed in the main body 17 of the test tray (16) In the production process of the LED 1, the LED 1 is placed in the insertion space 22 of the custom tray 21 shown in FIG. Since the LED is contained facing upwards, it is advantageous to realize the automation of the tester by moving the LED 1 contained in the customer tray 21 to the test tray 16 and then loading it into the test section.

Therefore, in order to move the LED 1 contained in the insertion space 22 of the customer tray 21 to the insertion space 18 of the test tray 16, cover the test tray 16 on the upper surface of the customer tray 21 upside down. The customer tray 21 and the test tray 16 are simultaneously inverted by 180 도록 so that the LED 1 in the insertion space 22 of the customer tray 21 is contained in the insertion space 18 of the test tray 16. do.

In this way, to safely and accurately transfer the LED (1) contained in the customer tray 21 to the test tray 16, or to move the LED (1), which is contained in the test tray 16, the test is completed to the customer tray 21 More preferably, the alignment means 20 is provided outside the insertion space 18 formed on the upper surface of the main body 17 constituting the test tray.

In one embodiment of the present invention, the aligning means 20 is formed as an integral insertion groove along the edge of the main body 17. However, if necessary, the alignment means 20 is inserted independently of the edge of the main body 17. At least two grooves (not shown) may be formed and applied.

However, when the alignment means 20 is formed as an inserting projection, as opposed to an embodiment of the present invention, it is a matter of course that an insertion groove is formed along the edge of the customer tray 21 shown in FIG. 8.

The alignment means 20 is shown as an insertion groove in the test tray 16 of FIG. 5 as an embodiment of the present invention, and the customer tray 21 shown in FIG. 8 is shown as an insertion protrusion 23.

Referring to the process of testing using the test tray 16 of the present invention configured as described above in more detail as follows.

First, the worker manually works in the process of loading the customer tray 21 containing the plurality of LEDs 1 in the insertion space 18 to the loading unit (not shown) so that the lens L faces upward. The customer tray 21 containing the LED 1 may be loaded into the loading unit one by one, but a plurality of customer trays 21 including the LED 1 in the loading unit may be stacked to realize automation of expensive equipment. More preferably, the customer trays are separated and supplied one by one.

If the customer tray 21 located at the top or bottom of the customer tray 21 stacked on the loading unit is automatically separated one by one and transferred to a loading position using a known transfer means (not shown), the loading is performed. The transfer transfer is holding the test tray 16 so that the through hole 19 formed in the test tray 16 faces upward, and then covers the test tray 16 on the customer tray 21 and then the customer tray 21. ) And the test tray 16 are simultaneously held and inverted by 180 °, so that the LED 1 contained in the insertion space 22 of the customer tray 21 is moved to the insertion space 18 of the test tray 16. Since the lens L faces downward, the lens L is exposed downward through the through hole 19 formed through the insertion space 18 as shown in FIG. 8.

At this time, the customer tray 21 and the test tray 16 coincide with each other in the right position by the alignment means 20 formed on the upper surface of the main body 17 of the test tray 16.

After moving the LED 1 contained in the customer tray 21 to the test tray 16 in this manner, the loading transfer moves the two

trays

16 and 21 to the test unit (not shown). By removing only the customer tray 21 located in the upper portion, the test unit tests the electrical and optical characteristics of the LED 1 contained in the insertion space 18 of the test tray 16.

As described above, through the test of the electrical characteristics by using the terminal (not shown) of the terminal of the LED 1 exposed to the upper portion of the test tray 16 in the process of testing the LED (1) 19 Through the lens (L) facing downward through the light will be emitted according to the application of power.

Since the light emitted from the lens L diffuses along the inclined surface 19a of the through hole 19 and is focused on the vertical surface 19b, more accurate optical test of the lens L is performed.

On the other hand, after the test of the LED (1) contained in the insertion space 18 of the test tray 16 for a predetermined time is made, by unloading the test tray 16 from the test unit inserting space of the test tray 16 ( The LED 1 contained in 18) is moved to the insertion space 22 of the customer tray 21. Since this process is performed in the opposite manner as described above, a detailed description thereof will be omitted.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiments are for the purpose of description and not of limitation.

In addition, it will be understood by those skilled in the art that various changes can be made within the scope of the technical idea of the present invention.

Claims

In the LED test tray having a plurality of insertion spaces 18 in which the LEDs 1 are contained on the upper surface of the main body 17 constituting the test tray 16, the through hole 19 in each of the insertion spaces 18 LED test tray, characterized in that the test of the LED (1) is made in a state in which the lens (L) of the LED (1) contained in the insertion space 18 is exposed through the through hole (19) .
The method according to claim 1,

The through hole (19) is characterized in that the upper and lowered inclined surface (19a) and the vertical test (19b) perpendicular to the inclined surface characterized in that the LED test tray.
The method according to claim 1,

Led test tray, characterized in that the alignment means 20 is provided on the outside of the insertion space (18) formed on the upper surface of the main body (17).
The method according to claim 3,

LED alignment tray characterized in that the alignment means 20 is formed integrally along the edge of the main body (17).
The method according to claim 3 or 4,

LED test tray, characterized in that the alignment means 20 is an insertion protrusion or insertion groove.