TW201109794A - Manufacturing method of backlight plate with series LED assembly and the displayer thereof - Google Patents

Abstract

A manufacturing method of backlight plate with series LED assembly comprises an energy supplying device, a series LED assembly, and a liquid crystal module. Wherein, the energy supplying device can enable at least two strings of the series LED assemblies connected in parallel, and the liquid crystal module for the backlight source. The series LED assembly is proximate to the product of composed of substantially amounts of serially connected LED, such that the supply voltage is the average voltage and the LED, thereby easing the problem of the difference of the necessary forward voltage and lowering the cost of screening LED. The backlight plate further comprises a homogeneous light device. Wherein, the front reflection object is disposed between a homogeneous light plate and the series LED assembly, and the rear reflection object is disposed away from the side of the homogeneous light plate. Two of these reflection objects alternatively project and homogenize the light from the series LED assembly to achieve the effect of lower the manufacturing cost and improve the yield rate.

Description

201109794 VI. Description of the Invention: [Technical Field] The present invention relates to a "backlight panel, in particular, an LED backlight panel with reduced riding conditions and a wire by a large-light-emitting diode (hereinafter referred to as LED) group (4) [Previous technology] The application field of LED has become wider and wider, and it has been gradually accepted as the mainstream by the backlight panel and display field. However, it is limited to 7 degrees of individual LEDs. Therefore, as shown in the figure - several LEDs are used. After the components are connected in series, they are driven by a single DC power source 12, for example, as a backlight of a notebook computer. The biggest advantage of the technology of serially connecting multiple LEDs is that the LED driving device is simplified, and a larger power can be used. And the smaller current provides enough electric power to drive multiple LEDs, and the cost of the power supply is smaller, thus achieving lower cost. However, on the one hand, the size of the display is becoming more and more large, and the current size of the notebook computer is ^ _ can not load the demand of the party's large size Φ board; especially the _^LED_ other forward drive voltage range must be limited to a small range, otherwise the DC according to the predetermined circuit design The source, when flowing through the string of LED components, the drive current will change greatly with the original design, resulting in a large variation in brightness of the entire string of LED components. However, in the process of manufacturing LED components, the wafer is first divided into one wafer. For example, a batch of 20,000 LED dies are packaged into LED components one by one. In the process of wafer fabrication and segmentation, some individual differences may occur. To avoid excessive differences in product performance, the entire batch of LED dies is generally The beta type is measured and classified according to its forward driving electric dust (Bin_s〇rjing), that is, each led die is at a certain fixed driving current' according to the value of the positive working voltage across the two poles of the LED die. And the illuminance brightness is screened, and the forward driving voltage required to illuminate the crystal grains is too far from the average value, for example, when it exceeds 50 mV, it is classified into another classification, thereby ensuring that the forward voltage of the produced crystal grains is matched. In the narrow range, on the other hand, this classification usually needs to eliminate about 10% of the grain first, and the cost increases accordingly. 201109794 Then, in the case of 70 pieces, it may be due to various processes. A few individual differences in the same batch of discarded LED components, as shown in Figure 2 'The same drive current If (such as the above current is 2G mA) T forward drive voltage Vf is still - Wei, and the range may be In the middle of 4.0V, and the Vf value probability distribution (7), this is the basic uti〇n) p(Vf) is the inverted clock scale in the figure's position _ facet is close to the distribution of a normal function Normal Distribution' The distribution function P(Vf) can be written as equation (1): P(v〇= ΔΥ-ν/2^ 2ΔΥ2 (1)

The average forward bias value of the whole batch of LED components is Vav = 3 5 she, * and the 'quasi-difference Δν distribution of the whole batch of components is about 0.2, which is fine, that is, about 30% of the components of the township are subject to When the driving current is on, the 3 5V difference of the positive solution is more than G 2V. ^ The whole batch of LED components in the same __ process will measure the forward voltage % under the same forward current, so as to calculate The function of the probability distribution of the batch of LED elements, ie p(Vf) = - 1 e ~(Vf -Vav)2, basin AV^/ϊπ 2AV2 ^ Ύ

Vf represents the forward bias of each LED element under the forward current Is. In order to make the product performance easy to expect and control, the fabricated LED components will be classified according to their respective forward bias, illuminance and uniformity, and the classification is finer, the classification accuracy requirements are more, and the cost of classification is performed. The higher the cost of collection and processing, in general, the positive bias gap of 0.1V is often a sub-category, so all products need to be divided into 10 categories as described above. However, with a forward bias error of 0.1 V, generally about 20% of the current error can be caused by the blue or green light of the RGB illumination module, and thus about 20% of the luminance error is generated. For a backlight that requires high uniformity, there is still a need for improvement. According to the above, the average forward driving voltage is 3.5V when the driving current is detected at 2〇πΑ before the LED components are in trouble. If not classified, generally, for example, one white LED component is selected in series. In the circuit design, the required total drive voltage Vcc is designed to be 35V. However, 201109794 is actually 'unless specifically screened, (d), when the number of components is small, the forward bias actually required to provide a normal drive current is easily deviated from the theoretical average. Referring to the typical (iv) read ι-ν curve in Figure 3, the higher the % value is, the higher the current If is; and the current (10) illuminance B is as shown in Figure 4, after exceeding the basic drive current. The luminance of the light increases substantially linearly with the current value. Once the sum of the forward driving voltages of the 10 LED elements is greater than the theoretical value of 35V and falls, for example, at 38V, the driving current flowing through the whole string component may suddenly drop to 12 mA by the predetermined Vcc=35V. The driving conditions will cause the brightness of the entire string of LEDs to differ from the original juiceless value by 40%, resulting in an unacceptable lack of brightness. In particular, the current large-size LCD displays require a large number of coffee chips, and in the case of a 42 (four) LCD TV, about 3 or so white light coffee (9) - or 3 00 · group RGB LEDs are required. If a string of led components is slaughtered in each string, then the entire backlight is about f 100 _. Even if the ship is classified in the above manner, it is not only forced to be classified into more than ten categories, resulting in reclining classification, storage management, and cost-making; once the series of different classifications are used in parallel, under the condition of crane voltage marriage, The problem of uneven illumination of multiple strings between the four (four) components is generated, resulting in partial _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ All belong to the same category. At present, another conventional technique is shown in FIG. 5, which uses a higher DC voltage* to drive 'an additional current source Is' to confirm that the forward current & County f traffic. If the LED component of the LED component has a Vf distribution of 3.0V to 4.0V, the maximum dust demand is 4V, multiplied by 3 components to be driven. The DC voltage source Vcc above the biliary is added to calculate the voltage drop of the current source k, so that the actually required Vcc is raised to about 122V. The current source Is is used to provide a current that is significantly higher than the highest demand, and the _ series LED description is illuminated as expected. However, the use of this method has the following disadvantages: 1. The power supply efficiency is low. · Because the power exceeding the actual demand cannot correspond to the light of the 201109794 device, the actual light is connected with the voltage according to the previous example. When the LED components are equal, the former classification method will only consume about π% of the power of the mode; 2. The combination of the current source using the fixed output current and the power source deliberately applying the higher voltage, according to the description s Corresponding to driving 100 strings of LEDs, one high-voltage current source Is must be provided in one display, and the manufacturing cost is greatly increased. 3. If the backlight is formed by RGB three-color crystal grains, the number of high-voltage resistant current sources is The cost needs to be more than three times. Therefore, the present invention provides a plurality of series-connected LED assemblies, increasing the number thereof, and controlling the number of the series of connections to be large enough to distinguish the forward bias from the normal driving current to an average level. In addition to precision classification of LED components, it reduces the need for classification and management costs. On the other hand, it only needs to use high-power _ low-current source, no need to deliberately choose the south-voltage current source that can control the current value. In particular, it can be matched with the homogenizing technology possessed by the towel, and the uneven brightness of the light between the various LED components and the particles in the serial LED assembly can be completely masked and the surface is greatly reduced. When the display is on, the 卩m selected by several LEDs in the backlight board is the dual effect of the lowest cost and the highest power supply efficiency. SUMMARY OF THE INVENTION The purpose of the present invention is to provide a backing wire with a splicing component, which is sufficient for a plurality of ED components to be connected in series, so that the driving voltage is substantially driven when the series is connected to the driving current. The average batch of LED components is multiplied by the number of particles to eliminate the need for precise classification of LEDs. The second aspect of the invention is to provide a backlight board with a series of LED components, which uses a sufficient number of LED elements to be connected in series, so that the serially connected strings need to be driven to meet the expected expectations, thereby eliminating the high price fixing. Current value current source requirements. Another object of the present invention is to provide a tandem LED assembly, wherein the backlight panel is connected in series with a plurality of LED elements so that the serialized series is driven by a driving current. Substantially conforms to the average of the entire batch of LED components multiplied by the number of particles, in order to eliminate the need for (4) the classification of the components; and to make the required driving dust of the serialized _ column meet the expectations, so that the fixed current value of the high price is excluded by 201109794 The need for current sources, which significantly reduces manufacturing costs. Another object of the present invention is to provide a display with a series of LED components, which utilizes front and rear two reflective sheets to reflect and illuminate the Φ-connected LED components in the backlight panel multiple times between the front and rear reflectors, and only Part of the light is emitted from the front reflector, so that the light source is completely homogenized, which further obscures the uneven illumination of the LED components, thereby allowing the LED element screening threshold to be greatly reduced. It is still another object of the present invention to provide a backlight manufacturing method having a tandem LED assembly which eliminates the need for precise classification of LED elements, thereby drastically reducing manufacturing costs. The re-invention of Luben--the purpose is to provide a kind of fine front and rear reflections>, so that the light emitted by the tandem LED assembly is reflected and multi-resoned between the front and rear reflectors to cover the uneven illumination of the series components. A backlight board method for serially connecting LE:D components. A backlight board with a series LED assembly, a method for manufacturing the same, and a display having the same, mainly comprising a set of energy supply devices, at least one set of serial LED components and a set of liquid crystal modules, wherein the s... The utility model provides a power material-connected LED component and a liquid crystal age, and the device is connected to the device for supplying power, and the serial Led component is composed of a plurality of LED components connected in series, through the string The connection method can achieve the power consumption of the LED components connected in series, and the ship crystal module is powered by the power supply provided by the energy supply device, and is not shown, and is connected to the LED component (four) light. a liquid crystal mode (four) light source; and the backlight board can be further used with a set of light homogenizing devices, the light homogenizing device mainly comprises a light homogenizing sheet, a front reflecting member and a rear reflecting member 'the front reflecting member is disposed on the light homogenizing sheet Between the series and the Le) assembly, and the rear reflector is disposed away from the side of the uniform light, wherein the reflectance of the rear reflector is nearly completely reflected, and the reflectance of the front reflector is higher than the transmittance thereof. Less than the reflectance of the rear reflector, the uniformity Different then transmitted through the front reflector with a reflectivity of the back reflector member, a light source of illumination may be cascaded LED assembly is increased, the power to achieve the purpose of effective utilization of the light source and uniform. [Embodiment] FIG. 6 is a block diagram showing a structure of a backlight board having a series connected LED assembly, which mainly includes a backlight board 30 and a liquid crystal module 36; and a backlight unit 3 includes an energy supply device 32 and At least two sets of LED assemblies 34 are connected in series with each other in parallel. The supply device 32 is configured to provide, for example, two strings of parallel LED assemblies 34 and liquid crystal modules 36 in parallel with each other; and as shown in FIG. 7, each of the series LED assemblies 34 includes a plurality of serially connected to each other. The LED elements 340' and the LED elements 34 are disposed in the same direction on the light emitting side; the liquid pickled peppers and 36 are disposed corresponding to at least two sets of the tandem LED assemblies 34, and are backlit by the tandem LED assemblies 34. illuminate.

The I-v curve of a typical LED component generally has a higher value of %, and the current If is larger, wherein for the same LED element 'current If and the luminance of the light 8, after exceeding the basic driving current, the light emission redundancy is The current value increases approximately linearly. However, with the slight difference in various conditions in the process, even the LED components manufactured by the same company, even the components encapsulated by the LED dies on the same wafer, each have their JV curves. difference. Therefore, if N LED elements manufactured in the same batch are connected in series, the total forward bias of the total series in the forward current If is · · · · Vf(N), as shown in Figure 8, according to Normal Distribution The mathematical theory, the probability distribution function P(Vfp) of the forward bias νίχ after series connection can be written as:

P(Vfr)=(Δντ) ▲ e (2) where VavT = NxVa...(3) AVt=VnxAV (4) The LED component distribution of the above example is an example, if 100 After the LED elements are connected in series, the theoretical value of the forward total bias voltage Vfr is (Vfr)av = 100 X 3.5 = 350Volts as shown in equation (3), and its standard deviation: Δντ = = Vi and X 0.2 = 2.0Volts, compared to the probability distribution diagram P(Vf) shown in Figure 2, the average forward bias of individual LED components is 3.5V, and the standard deviation is 0.2V. It can be found that the forward direction of the entire string of LED components after series connection The theoretical value of the bias voltage (Vfr) av = 350V 〇lts, still a 201109794, 70 theoretical values are fine (four) the number of components; but the ground reduction, (4) the forward bias deviation of the LED components ^^.OVolts is obviously better than The value of 〇.2V X 1〇〇 is reduced, that is, although the LED assembly according to the present disclosure (4) is not subjected to the classification process of the led component before manufacture, and the sum of the forward bias is distributed. It is still significantly smaller than the distribution ratio of the original single. It can be concluded from the above formula that if there are (10) excitation elements connected in series, the distribution range can be reduced to the original thin | times, that is, Φ is connected to 1 GG without the LED components, and the forward components of the series components can be biased. The shop is the original theoretical value and (4) the number is multiplied by -. For example, in the first preferred embodiment, there is a tandem LED cultivating series, and the distribution range of Vf can be reduced to the original *=5%. Even with four standard deviations as the boundary, the minimum value of Vfr is about 35〇_(4χ2 〇) = 342V〇丨匕, and the maximum value is about 350+(4X2.0)=358V〇lts, between multiple LED components. The forward bias gap is only 358V - 342V = 16V, which is still smaller than the dispersion of the original unclassified single LED component; however, the standard deviation of four times means that all the serial LED components produced Among them, more than 99% are in this range, especially when the number of LED elements in series is increased, the concentration of positive phase bias of the whole string of LED components can be more obvious. Using the above principle, the second preferred embodiment of the present invention will take a 42-hour LCD τν backlight panel as an example to calculate the actual situation: here, the brightness of the backlight panel is 6 〇〇〇cd/m 2 , and the backlight The area of the board is about 54.54m2, so the total brightness of the required LED is 3200cd. When the white LED component is at the forward current If = 2〇mA, the average brightness of each LED is 丨cd, then the backlight needs The number of white LEDs is 3,200. Considering the general high voltage and low current power supply cost lower voltage and high current cost, so the same 400 Watls power supply, if the 5 Volts, 80 A power supply cost will be much higher than 1000 Volts, 0.4 A power supply cost. Because the current high-voltage low-current power supply has been widely used in the original 201109794 CCFL cold cathode tube backlight board 1 this is a fortune, also as a general cold cathode tube inverter (Ι·_ for power supply, but the invention is not Limiting the use of other power supplies is a high-voltage, high-frequency AC power supply. Therefore, a bridge rectifier and a ferroelectric grid can be added to the output to become a -bias voltage DC power supply. However, other high-voltage DC power supplies are used. DC_DC·α>ην_ converts the _ Buek. c_rter circuit into a high-voltage DC. In this example, it needs to use 3200 white-red EDs, and the more LEDs are used in series through the principle described above. 'It can reduce the variation range of its total forward bias. Therefore, as shown in Figure 9 in this example, select the side LED elements in series as an example. Each string of LED components has - LED components, and the light source in the backlight. It consists of 8 strings of LED components such as ST8. If the average forward voltage (under current) of each single white LED component is 3.5Volts, and the single LED The forward bias distribution range is 3 〇ν〇^~4 〇, then *(8) LEDs in series with SLED components, the total forward voltage of each component is theoretically the value of the job, and (4) the total forward bias of the LED components is shown in Figure 10, which will be limited to Do not 〇 Volts ~ 1410 Volts. As shown in Figure 10 - hemp, the eight groups of _ connected to the LED component M, the positive electrode is completely combined with the voltage of the Volts power supply Vw 'the serial connection of the LED components π grounding and connected to - The contact resistance Rs ' is used as the backup voltage Vs of the operating current Ιτ, and the regulated voltage of the power supply*. Since the direct/machine power supply Vcc is selected as 14〇〇v〇its, the possible distribution range is better than the ideal total. The forward bias value 'error is only within 1%, because the difference of forward dust between each _ LED component is very small, the following will prove that even if the eight series of LED components are used from full parallel, only a single power supply The device enables 'applying the same voltage Vcc to the series of LED components from the series of led components, 201109794. The difference in luminous intensity between each other is extremely limited and cannot be easily observed. Due to the total forward bias of each string of LED components The pressure value Vt(i) = Vi(i) +v miscellaneous ___ force (1), and LED components! — V curves are different, so that the actual total forward bias of each string of components is different when the drive current is fixed. If the total (four) forward voltage* is selected at 1400 Volts ' The relationship between the total forward bias %(1) and the current j of each string of LED components is shown in FIG.

Where 'when the fixed current is 20 mA', the total polarization needs to be 141 〇v of the string LK) component, the forward current If at Vcc^MOO V, will be slightly estimated as bu = i9 mA; relatively, forward current 2〇mA total bias is 139〇v of the group of components, in

The forward current at Vcc=1400 V is “1 + 1400-1390' ~200~~.

: 20 mA = 21 mA can be seen, according to the manufacturing method of the present invention, even in the first step, the LED τ οο 3*' is not connected in series without a detailed selection, when the number of serially connected LED elements is sufficiently large, in the second In the step, at least two sets of LED components 34 are connected in series, in parallel, to a single-group power supply*, and the driving current of each series-connected LED component 34' is close to the originally predetermined ideal driving current If 20 mA. 'It can be determined that the total operating current flowing through ^ is still quite close to the ideal value ι6 〇 μ (2 〇 rnA χ 8) ' and the difference in forward current between the series connected LED components 34' is also limited to 5%. Progressively, since the brightness of the LED is approximately proportional to the current, the average brightness difference of each of the serially connected LED components is also within 5%. If you want to adjust the brightness of the backlight, you can adjust the Vcc voltage to, for example, 13〇〇v〇lts (3.25V x 400 LEDs), then the forward current w15mA of each string of LED components 34, Using the relationship between the luminance of the light emitted in Fig. 13 and the current Iv_If, it can be seen that the luminance B of the light is about 75% of that of the aforementioned 11 201109794 20 mA. Therefore, as long as the voltage of Vcc is modulated, the brightness of the LEDs 34 of the series of LEDs can be controlled. Since the eight strings of LED components are driven by the same forward current, the forward bias of each other may be only about 1%; therefore, when the same voltage is applied in parallel, the individual forward current error will be limited to 5%. . As shown in the previous embodiment, when a string of LED components is actually connected in series with 4 LED elements, and the forward voltage across each LED component is about 3.5 v, the potential difference between the head and the tail of a string of LED components will be 1400 V, once the engineer of the design circuit does not check, the whole series of LED components are mistakenly folded into a “u” shape design. When the distance between the two ends is insufficient, the risk of short-circuiting and short-circuiting of the voltage across the LED components will be raised. In order to improve the security, the present invention has a second preferred embodiment of the backlight assembly for the LED assembly. The LED distribution of the backlight panel will be arranged as shown in FIG. 14 and the ST1 is disposed at the uppermost portion as shown in the figure. Step by step, set ST2, ... ST8' and set the 8-string LED components ST1, ST2, ... ST8 to ten times for each string of LED components, so that each "reflex" will be connected to 5 (4) element. Therefore, the potential difference is only 35v between the ends of the first array and the second array. The series connection of this method can reduce the voltage difference between the LEDs and the security of the miscellaneous PCB board. Of course, as can be easily understood by those skilled in the art, although the above embodiments are all based on white LED components, 'there is no need to use the RGB three-color coffee components to make the coffee backlight board. 'R, G, B only The positive bias voltages of the color LED elements are not the same, so the LED 7L pieces of each color must be self-contained into a plurality of strings of components ' and driven at different voltages according to the respective colors. For example, in the above example, a 42-hour backlight panel requires 3200 sets of R, G, and B LED components to be combined, and if each 4 〇 0 LED elements are connected in series to form a series of monochromatic LED components, each color led The components need 8 strings of 'the same color - 8 series of LEDs can be supplied by the same high-voltage DC power supply, so three different cage power supplies are needed. When it is necessary to adjust the color temperature, it can also be fine machine ^,

VccG, VccB three power supply voltages, you can individually adjust the red, green, and blue colors of different supply 12 201109794 current, thus producing the required brightness ratio to achieve any color temperature required. Further discussion, due to the difference in the manufacturing process of the LED components, although the LED components are driven by the same current, the output brightness of the LED components may reach ±2〇%. If the most economical structure is to be achieved and the need for classification screening is reduced, such brightness differences must be uniformized to avoid viewers immediately discovering differences in brightness between such LED components. Therefore, when the backlight panel of the present invention is formed into a display, a preferred embodiment of the display of the present invention is as shown in FIG. 15 , after the backlight panel is completed, a set of light-collecting devices 38 ′′ are disposed at the corresponding backlight panel. The light homogenizing device 38 of the present embodiment includes two front and rear counter-reflecting members having different viewing rates, which are exemplified as front reflection sheets and rear reflection sheets 382, 384, and rear reflection sheets 384 in this example. The reflectance is planned to be 100% fully reflective, with only the front reflector 382 being partially transmissive. Thereby, the light emitted by the LED 70 member 340' is substantially reflected whether it is irradiated to the front reflection sheet 382 or the rear reflection sheet 384, and is continuously moved back and forth between the two reflection sheets, and finally to the front reflection sheet 382. After passing through the homogenizer 386', it is finally irradiated to the liquid crystal module 36. In this way, a highly reflective partially transmissive reflector is used, and the total reflection of the bottom surface forms a multi-reflection optical resonant cavity to increase the tandem LED assembly 34, and the illumination line is uniformized. With this technique, if a partial reflection film (partial Lum Tmsmissi〇n Films) with 10% transmission and 9〇% reflection is used as the material of the front reflector, the uniformity of the LED element can be increased by 10 times according to the experimental results. That is to say, even if the original LED elements have a difference in luminance of ±2〇%, after the structure is homogenized, the unevenness of the structure is at most ±2%. Moreover, according to the foregoing analysis in the present case, each series is connected. The difference in luminance between LED components is less than 5%. Thereby, the advantages of the knife-type LED elements are completely exerted to the utmost, and the uneven brightness of the illuminating brightness of the unclassified LED elements is concealed to the point where it is difficult to observe. As can be seen from the above description, by using a plurality of LED elements in series, not only the difference in forward bias between the series of LED components can be reduced, so that a plurality of LED modules of the same function can be driven in parallel and driven by a group of power sources. Moreover, the screen pinch of the difference in forward voltage and brightness of each LED element can be greatly reduced, and the cost can be greatly reduced to make a very economical backlight. Of course, the number of serially connected LEDs is familiar to those skilled in the art. As long as it can reach, for example, 36, the deviation of the 'va forward bias voltage of the LED assembly can be made smaller than that of the single LED component. The product of the offset value and the total number of LED elements is reduced by a factor of six, such that, for example, a 12-inch panel can be connected in parallel, for example, with two sets of low-level components. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications according to the scope of the invention and the description of the invention are still It is within the scope of the patent of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the illumination of a plurality of serially connected LED elements driven by a single DC power supply; FIG. 2 is a probability distribution diagram of a forward driving voltage Vf value of a conventional LED element at a driving current of 20 mA; Figure 3 is a graph showing the relationship of the iv of a general LED element; Figure 4 is a graph showing the relationship between the current If and the luminance B of the LED-like element; Figure 5 is a conventional use of the current source Is to enable the lighting connection A schematic diagram of the LED, indicating that the voltage Vcc is required to exceed the maximum required voltage of a single LED multiplied by the number of connected LEDs; FIG. 6 is a block diagram of a first preferred embodiment of a backlight panel having a serial LED assembly according to the present invention; FIG. 6 is a schematic diagram showing the structure of the embodiment of FIG. 6; FIG. 8 is a graph showing the probability distribution of the total forward bias voltage Vfr of the tandem LED assembly used in the driving current of FIG. 6; FIG. FIG. 10 is a schematic diagram showing a relationship between a plurality of sets of LED components in a backlight panel on a backlight board; FIG. 10 is a distribution diagram of a total forward bias IV relationship of each of the series LED assemblies in FIG. 6 at a driving current of 2 mA; FIG. Figure 6 embodiment of the backlight circuit The intention is to explain the relationship between the energy supply device and each series of LED components. Figure 12 is the relationship between the current I and the total forward bias when the same forward voltage Vcc is applied to each series of LED components in Figure 11. Figure 13 is a graph showing the relationship between the luminance and current Iv_If of the embodiment of Fig. 6, illustrating the control mode for adjusting the brightness of the backlight 201109794; Figure 14 is the second preferred embodiment of the backlight panel having the LED assembly of the present invention. In the embodiment, a reciprocating series arrangement diagram of the serially connected LED components; and FIG. 15 is a schematic structural view of the first preferred embodiment of the display of the present invention, illustrating the structural relationship of the uniform light-emitting backlight panel. , and [Main component symbol description] 10 LED components 12 Lu 30 32 34, 34, 340, 340, DC power supply Backlight panel Energy supply device Serial LED components LED components 36, 36' 38 382,

384, 386' LCD Module Dodger Front Reflector Back Reflector Uniform 15

Claims (1)

201109794 VII. Patent application scope: 1. A backlight board having a series LED assembly, comprising: a set of energy supply devices; and at least two groups connected in parallel with each other, being energized by the energy supply device, and respectively comprising a plurality of strings Connected to the LED component, the number of the serial LEDs is such that when the at least two sets of LED components are illuminated, the entire string of the at least two sets of LED components is enabled The difference between the voltage minus the product of the average enable voltage of the LED elements in the component and the number of LEDs in the component is less than the statistical standard deviation of the individual enable voltages of the LED components in the component and the LEDs in the component The product of the number of components is a predetermined multiple; whereby the individual differences in the LED elements affect the degree of influence of the enabling voltage provided by the energizing device' by a predetermined multiple. 2. The backlight of claim 1, wherein the difference is less than one sixth of the product of the standard deviation of the number of LED elements in the component. 3. The backlight of claim 1, wherein the difference is less than one tenth of a product of the standard deviation and the number of the LED elements in the component. 4. The backlight of claim </ RTI> wherein the light-emitting sides of the at least two of the series of LED components are disposed in the same direction. 5. A backlight unit as claimed in item i, 2, 3 or 4 of the patent scope, further comprising a set of light homogenizing means. 6. The backlight unit of claim 5, wherein the group of light homogenizing devices comprises: a light homogenizing sheet; a set of front reflecting members respectively disposed between the light homogenizing sheet and the at least two sets of tandem LED assemblies, And a rear reflection member disposed on the side of the at least two sets of LED components away from the light homogenizer; wherein the reflectance of the rear reflector is near complete reflection, and the reflectance of the front reflector is higher than the transmittance thereof. Less than the reflectance of the rear reflector. 7. A display having a backlight assembly of LED components, comprising: a set of backlights having serial LED components, comprising: 16 201109794 a set of energizing devices; and at least two groups comprising a plurality of LEDs connected in series and subject to The energy-supplied device enables the illuminating series-connected LED assembly to have the number of the series-connected LEDs such that when the at least two-site serially-connected LED assembly is illuminated, the enabling voltage of the at least two sets of series-connected LED components is subtracted The difference between the average enable voltage of the LEDs in the component and the number of LEDs in the component is less than the product of the statistical standard deviation of the individual enable voltages of the LEDs in the at least two components and the number of such LEDs in the component. Reaching a predetermined multiple; thereby, the difference in the LEDs affects the degree of influence of the enabling voltage provided by the energizing device is reduced by the predetermined multiple; and a group corresponding to at least two sets of tandem LED components Set the LCD module. 8. The display of claim 7, wherein the at least two sets of tandem LED components are arranged to face the liquid crystal module. 9. The display of claim 7 wherein the difference is less than one tenth of the product of the standard deviation of the number of LEDs in the component. 10. The display of claim 7, wherein the backlight further comprises a set of hooking means. 11. The display of claim 1, wherein the group of light homogenizing devices comprises a light homogenizing sheet; and one set of the light homogenizing sheets respectively disposed on the light homogenizing sheet without at least two sets of LED components _ front reflecting members, and The at least two sets of LED components are away from the rear reflector of the light homogenizer side; wherein the rear anti-fresh anti-fresh system is nearly completely reflective, and the reflectivity of the shooter is higher than the transmittance but less than the back reflection Reflectivity. 12. A method of fabricating a backlight having a series LED assembly, comprising the steps of: a) planning at least two sets of tandem LED assemblies each comprising a plurality of LED elements connected in series; and b) providing an energizing device, Providing the parallel connection and illuminating the at least two sets of tandem LED components; wherein the number of the LEDs is such that when the at least one set of LED components is illuminated, the at least two sets of LED components are connected in series The whole string of enable voltages of either one is subtracted from the component. 2011 2011794 The difference between the average enable voltage of the LED components and the LEDs in the component is less than the enable voltage of the LEDs on the side of the device. The statistical standard deviation of the product of the number of LED elements in the component is a predetermined multiple; whereby the individual differences of the LED elements affect the degree of influence of the enabling voltage provided by the energizing device, which is reduced The predetermined multiple. 13. The method of manufacturing a backlight having a series-connected LED assembly according to claim 12, further comprising the step c) of providing a group of light-shaping devices, wherein the group of light-shaping devices comprises: a light-shading sheet; a front reflective member disposed between the light homogenizing sheet and the at least two sets of serially connected LED components, and a rear reflective member disposed on the side of the at least two sets of serially connected LED components away from the light homogenizing sheet; wherein the rear reflective member has a reflectivity The system is nearly completely reflective, and the reflectance of the front reflector is higher than its transmittance but less than the reflectance of the rear reflector.