CN113012627B - Constant current drive circuit and display panel - Google Patents
Constant current drive circuit and display panel Download PDFInfo
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- CN113012627B CN113012627B CN202011108239.2A CN202011108239A CN113012627B CN 113012627 B CN113012627 B CN 113012627B CN 202011108239 A CN202011108239 A CN 202011108239A CN 113012627 B CN113012627 B CN 113012627B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The invention relates to a constant current driving circuit and a display panel. Through the selection unit arranged between the constant current source and the light emitting diodes, the driving current of the constant current source can be switched to the light emitting diodes of different output channels, so that the driving current of each light emitting diode is balanced, the problems of uneven gray scale color blocks and color cast caused by brightness difference in the display panel are reduced, and the display effect is improved.
Description
Technical Field
The invention relates to the field of semiconductor devices, in particular to a constant current driving circuit and a display panel.
Background
Light Emitting Diodes (LEDs) are a new generation of display technology, have higher photoelectric efficiency, higher brightness, higher contrast and lower power consumption than liquid crystal displays in related technologies, can be combined with flexible panels to realize flexible displays, and are widely applied in related fields. In the application of the existing Light Emitting Diode, the Mini LED (Light Emitting Diode) has the advantages of small volume, power saving, wide color gamut, long service life and the like, and with the mature manufacturing process and the reduction of price, the Mini LED direct display and backlight products are more and more. Such as direct-lit LCD backlights, large-screen video displays, and the like. Particularly, in the direct display field, the requirements for the display effect of the LED are increasing with the expansion of the application range. The driving of the LEDs is of the current-driven type, and the accuracy of the current directly affects the brightness and chromaticity of the display. At present, the Mini LED is limited by the manufacturing process, and basically can only be driven in a passive mode, namely a PM-Mini LED. The current driving IC of the PM-Mini LED is influenced by the manufacturing process, and the driving current with the same size has the difference which cannot be eliminated for different constant current sources, so that the brightness and the chroma of the LED lamps driven by different channels have the difference, and the display problems of uneven gray scale color blocks, color cast and the like are caused.
Therefore, it is an urgent need to solve the problem of reducing the display brightness difference of the LED lamps in the display panel and reducing the color block unevenness and color cast of the display gray scale of the display panel.
Disclosure of Invention
In view of the above-mentioned deficiencies of the related art, an object of the present invention is to provide a constant current driving circuit and a display panel, which are used to solve the problems of color block unevenness and color cast of the display gray scale of the display panel in the related art.
A constant current driving circuit comprises a plurality of constant current sources, a plurality of selection units and a plurality of output channels, wherein the output end of each constant current source is connected with one selection unit, and the output end of each selection unit is connected with at least two output channels; each output channel comprises at least one output end, each output end of the output channel is connected with a light emitting diode in the display panel, and different output ends of the same output channel are connected with the light emitting diodes in different scanning units;
the input end of the constant current source is used for receiving a control signal and outputting a driving current corresponding to the control signal to the selection unit connected with the constant current source through the output end of the constant current source;
the selection unit is used for determining a target output channel from at least two output channels connected with the selection unit according to the control signal and outputting the driving current to the corresponding light emitting diode through the output end of the target output channel.
According to the constant current driving circuit, the selection unit arranged between the constant current source and the light emitting diodes can switch the driving current of the constant current source to the light emitting diodes of different output channels, so that the driving current of each light emitting diode is balanced, the problems of uneven gray scale and color cast caused by brightness difference in the display panel are reduced, and the display effect is improved.
Based on the same inventive concept, the invention also provides a display panel, which comprises a plurality of light emitting diodes and the constant current driving circuit.
The display panel comprises the constant current driving circuit, so that the problems of uneven gray scale color blocks and color cast caused by brightness difference in the display panel are reduced, and the display effect is improved.
Drawings
Fig. 1 is a schematic diagram of a constant current driving circuit according to an embodiment of the present invention;
fig. 2 is a detailed composition schematic diagram of a constant current driving circuit provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a selecting unit structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a selecting unit structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a selecting unit structure according to an embodiment of the present invention;
fig. 7 is a schematic diagram of timing control signal input according to an embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the existing scheme, the driving current of each light emitting diode on the display panel is realized by a connected constant current source; generally speaking, a constant current source is fixed to provide a driving current for one led in one scanning unit, and the gray scale brightness of different leds is different due to the unavoidable difference between the constant current sources, the display of the display panel is not uniform, and the display effect is poor.
Based on this, the present invention intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.
In the constant current driving circuit illustrated in the present embodiment, the constant current driving circuit includes a plurality of constant current sources 20, a plurality of selection units 30, and a plurality of output channels 40, an output end of each constant current source 20 is connected to one selection unit 30, and an output end of each selection unit 30 is connected to at least two output channels 40; each output channel 40 includes at least one output end, each output end of the output channel is connected with a light emitting diode in the display panel, and different output ends of the same output channel are connected with light emitting diodes in different scanning units;
the input end of the constant current source is used for receiving a control signal and outputting a driving current corresponding to the control signal to a selection unit connected with the constant current source through the output end of the constant current source;
and the selection unit is used for determining a target output channel from the at least two output channels connected with the selection unit according to the control signal and outputting the driving current to the corresponding light-emitting diode through the output end of the target output channel.
In the constant current drive circuit in the present embodiment, it includes a constant current source 20 for outputting a drive current and a selection unit 30 for further controlling an object of output of the constant current source 20, and an output channel 40 connecting the selection unit 30 with a corresponding light emitting diode. The constant current source 20 is a power source for constant current output, and can input a driving current of a specified magnitude to a specific light emitting diode under the control of a control signal, and the driving current can cause the corresponding light emitting diode to emit light according to a set brightness; the plurality of light emitting diodes on the display panel can make the display panel present a desired display effect under the driving of the corresponding driving current.
For display panels, especially for led direct display, the display principle is basically implemented by scanning frame by frame and line by line. Specifically, the frame-by-frame scanning is a refresh rate of a screen for a display panel, and is refreshed several times in 1 second; in general, the screen refresh rate may be 24Hz, 48Hz, 60Hz, 90Hz, 120Hz, 144Hz, etc., which respectively represent that the display screen is refreshed 24 times, 48 times, 60 times, 90 times, 120 times, and 144 times within 1 second. The leds in the display panel are arranged in a horizontal-vertical array, and usually include RGB leds, and in a display panel, the number of leds included in the display panel is tens of thousands or hundreds of thousands according to the difference of the display resolution, and obviously, if the constant current source 20 corresponds to the number of leds, the cost is too high, and it is difficult to implement. Therefore, the scanning is usually performed line by line, that is, for the leds arranged in the horizontal and vertical array, a string of the leds arranged in the vertical array is driven by the same constant current source 20, which is implemented by: in the display of each frame, scanning is further performed row by row, and the constant current source 20 drives only the light emitting diodes corresponding to the scanned row during each row scanning. That is, one scanning unit corresponds to one row of light emitting diodes. The output channel 40 in this embodiment corresponds to a plurality of leds connected in the same row, and the leds in different rows are regarded as different scanning units and can be driven by the same constant current source 20.
In this embodiment, the selection unit 30 switches the driving current of the constant current source 20 between different output channels 40, that is, the switching between different light emitting diodes in the same scanning unit can be realized. This is because, in the prior art, although one constant current source 20 can drive different leds, it is aimed at driving leds in different scanning units, i.e. different rows and columns, and cannot switch to driving other leds in the same scanning unit. In view of this, the selecting unit 30 in the embodiment of the present invention may switch the output target of the driving current output by the constant current source 20 between different light emitting diodes in the same scanning unit, please refer to fig. 2, where fig. 2 shows an arrangement manner of the selecting unit 30, the constant current source 20 takes 16 output channels as an example, each constant current source 20 is connected to one selecting unit 30 (from the selecting unit 301 to the selecting unit 3016) for being connected to the driving current output by the constant current source 20, the selecting unit 30 receives the Data signal (i.e., the driving current) output by the constant current source 20, and selectively outputs the Data signal to one Out channel to drive the corresponding light emitting diode.
Since there is a natural difference in current magnitude between different constant current sources 20, even if the difference is very small, the difference still causes the display effect of the display panel, and there is a difference between different display areas. For example, for the two constant current sources 20A and B, which respectively input driving currents for the light emitting diodes a and B, assuming that a current 0.1mA is also outputted, the current outputted by the constant current source 20A may be 0.097mA, and the current outputted by the constant current source 20B may be 0.103mA, which are different by 0.006mA, but there is a certain brightness difference for the light emitting diodes, which results in a brightness difference between the light emitting diodes a and B. In the present embodiment, by setting the selection unit 30, the driving current outputted by the constant current source 20A can be supplied to the light emitting diode B, and the driving current outputted by the constant current source 20B can be supplied to the light emitting diode a, so that the luminance display between the two is balanced, and the luminance difference between the two is correspondingly reduced in a period of time. Moreover, this is just a switch between two leds, switching between more leds, which has a better effect on the gray scale display averaging of the display panel.
Specifically, the control signal in the embodiment of the present invention may include a driving control signal and a timing control signal, the driving control signal is used to control the magnitude of the driving current output by the constant current source 20, and the timing control signal is used to control the selection unit 30 to determine the target output channel. The control signal includes at least two components, which are a driving control signal for controlling the magnitude of the driving current output by the constant current source 20 and a timing control signal for controlling the selection unit 30 to select a target output channel. In other words, the control signal has two functions, namely controlling the brightness of the led and controlling the assigned led. The two components of the control signal may be sent to the constant current source 20 at one time, and the constant current source 20 may directly determine the magnitude of the driving current and the target output channel based on the control signal, or may be divided into two parts according to the driving control signal and the timing control signal to control the constant current source 20 and the selection unit 30, respectively.
In some embodiments, the light emitting diodes in the display panel are common anode driven or common cathode driven. Referring to fig. 3, a light emitting diode lamp block with a 16 × 8 matrix is shown, which includes a driving circuit, a scanning circuit, and a light emitting diode array, where S1-S8 are scanning signals and are connected to the anodes of the light emitting diodes; the driving current signal Out1-Out16 is connected to the cathode of the LED; the common cathode driving is opposite to the common anode driving, the common cathode driving is that the cathode of the light emitting diode is connected with the scanning unit to perform progressive scanning control, and the anode is connected with the constant current source 20 to receive the driving current of the constant current source 20.
In some embodiments, the display panel is a direct display panel which performs display by directly emitting light through the light emitting diodes, or a backlight panel in which the light emitting diodes serve as a backlight. The direct display panel is the self-luminous characteristic of the light-emitting diode, and directly leads the light-emitting diode to be used as a pixel point for displaying and emitting light; the backlight panel uses the light emitting diodes as a backlight source to display.
In some embodiments, a driving input unit 10 for outputting a control signal may be further included, wherein the control signal output by the driving input unit 10 includes a controlled object and a controlled magnitude of a driving current, wherein the controlled object represents a controlled light emitting diode, and the magnitude of the driving current is to control the brightness of the light emitting diode according to an effect of contents to be displayed.
The driving input unit 10 specifically includes a signal input unit and a digital-to-analog conversion unit; the signal input unit is used for inputting digital signals, and the digital-to-analog conversion unit is used for converting the digital signals into control signals in the form of analog signals and controlling the corresponding constant current source 20 and the selection unit 30. The digital signal inputted by the signal input unit may be data and control signals such as DI/DCLK/LAT/GCLK, and the digital-to-analog conversion unit converts the digital signal into an analog signal to control the constant current source 20 to output a corresponding driving current to a designated light emitting diode.
In some embodiments, the selection unit 30 includes a plurality of switch circuits, and at most one output channel 40 is connected to the corresponding constant current source 20 at the same time through the open-close connection of each switch circuit, and the connected output channel 40 is the target output channel, please refer to fig. 4. The selecting unit 30 is used to switch the output of one constant current source 20 between different leds at different times, and at the same time, the constant current source 20 only provides a driving current for one led, and in a special case, such as a black screen display, or when only the corresponding led does not emit light, the constant current source 20 does not provide the driving current for the corresponding led. And the selection unit 30 may be composed of a plurality of switching circuits in order to realize the function of the selection unit 30. In each switching circuit, the constant current source 20 can be connected with the single output channel 40 through reasonable opening and closing, so that the constant current source can output driving current to the light emitting diode.
Specifically, the switch circuit in the selection unit 30 may include at least two stages, each stage of the switch circuit includes a plurality of single-pole double-throw switch circuits, and the first stage of the switch circuit includes a single-pole double-throw switch circuit and is directly connected to the output terminal of the constant current source 20, the number of the single-pole double-throw switch circuits in the other stages of the switch circuits increases in sequence, the input terminal of the single-pole double-throw switch circuit is connected to one of the output terminals of the first stage of the single-pole double-throw switch circuit, and the output terminals of the single-pole double-throw switch circuit are respectively connected to the input terminals of two next stage of the single-pole double-throw switch circuit, please refer to fig. 5. The term "single-pole double-throw switch circuit" means that the circuit has a characteristic that when one of the lines is connected, the other line is correspondingly disconnected, and please refer to fig. 5, wherein each dashed box in fig. 5 represents a single-pole double-throw switch circuit. In this case, if the first stage switching circuit includes a single pole double throw switching circuit (e.g., a single pole double throw switching circuit composed of M1 and M2 as shown in fig. 6), then at least half of the line continuity potential is reduced when connecting one of the lines, regardless of how many stages the subsequent single pole double throw switching circuit has. And the subsequent single-pole double-throw switch circuit is correspondingly opened and closed, so that at most one passage between the constant current source 20 and the light emitting diode can be realized at the same time. For example, selection unit 30, shown in FIG. 5, indicates that Out1 is on and the other outputs are not.
Furthermore, each single-pole double-throw switch circuit may include two Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs) in pairs, one of the MOSFETs being P-type and the other being N-type, and a timing control signal of the control signal is simultaneously input to the two MOSFETs through the gates; the timing control signal comprises high and low levels, and the opening and the closing of the metal oxide semiconductor field effect transistors in the pair are controlled by the high and low levels. As shown in fig. 6, a circuit diagram of a selection unit 30 shown in fig. 5 is specifically shown, which corresponds to the output of a constant current source 20 and can switch between 16 leds (or 16 leds on a column line).
Alternatively, the present embodiment selection unit 30 includes 30 MOSFETs. The timing control signals are k1, n1 to n2, m1 to m4, and v1 to v8 for each stage of MOSFET, respectively, for the driving current Data m output by the constant current source 20, the corresponding light emitting diode can be turned on by controlling the MOSFET through the timing control signals, and it is known from the setting manner of the MOSFET in the selection unit 30 that at most one path can appear at the same time, and two or more paths cannot appear, so that the normal display effect can be ensured. For example, the driving circuit designed in the present scheme realizes the signal flow direction indication that the driving current signal Data1 of the constant current source 20 is output to the Out13 channel, at this time, the output timing diagram of the timing control signals k1, n1 to n2, M1 to M4, and v1 to v8 is shown in fig. 7, in the time period t1 to t2 when Data1 is output to the Out13, k1 is at a low level, then the corresponding M1 is closed, and M2 is opened; n2 is low, then the corresponding M6 is on, M3 → M5 is off; m4 is high, then the corresponding M13 is on, M7 → M12 is off, M14 is off; v7 is high, then the corresponding M27 is open, M15 → M26 is closed, and M28 → M30 is closed. The other timing control signals n1, m2 to m4, v1 to v6 and v8 may be of any level, and may be all pulled high or low.
In some embodiments, the display panel includes a plurality of led blocks, the led blocks include a plurality of leds arranged in an array, and in each led block, the output end of the single selection unit 30 is connected to all the leds of the same color in the same scanning unit. In this embodiment, the display panel may be divided into a plurality of led blocks according to regions, and in each led block, the number of the corresponding constant current sources 20 may be set according to the number of leds in a single scanning unit; specifically, in the light emitting diode lamp block, the number of the constant current sources 20 is equal to the number of light emitting diodes in the same scanning unit. Correspondingly, the number of the selection units 30 corresponds to the number of the constant current sources 20 one by one, and one constant current source 20 is connected with one selection unit 30; the selection unit 30 can select the larger number of the connected leds, the better the screen display effect is improved, and the output end of the selection unit 30 can be connected to all the same-color leds in the same scanning unit, or all the leds in the same scanning unit. Assuming that 16 light emitting diodes are included in the same scanning unit, the selection unit 30 can switch the driving current of one constant current source 20 among the 16 light emitting diodes.
As can be seen, the constant current driving circuit provided in the embodiment of the present invention can switch and input the driving current of the constant current source 20 to different light emitting diodes through the selection unit 30 disposed between the constant current source 20 and the light emitting diodes, so that the driving currents of the light emitting diodes are balanced, the problems of uneven gray scale color blocks and color cast caused by luminance differences in the display panel are reduced, and the display effect is improved.
The embodiment of the invention also provides a display panel which comprises a plurality of light emitting diodes and the constant current driving circuit in the embodiment of the invention.
The display panel in the embodiment of the invention comprises a plurality of light emitting diode lamp blocks, wherein each light emitting diode lamp block comprises a plurality of light emitting diodes arranged in an array, a scanning array is arranged in the transverse direction, and a driving array is arranged in the longitudinal direction; the scanning array comprises a plurality of scanning units, and the light emitting diodes in the same scanning unit are controlled by the driving currents of different constant current sources at the same time; and the output end of the constant current driving circuit is connected to the light emitting diode and provides driving current for the light emitting diode.
The display panel comprises the constant current driving circuit, wherein the light emitting diode in the display panel is driven by the driving current provided by the constant current driving circuit, so that the problems of uneven gray scale color blocks and color cast caused by brightness difference in the display panel are reduced, and the display effect is improved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (8)
1. The constant current driving circuit is characterized by comprising a plurality of constant current sources, a plurality of selection units and a plurality of output channels, wherein the output end of each constant current source is connected with one selection unit, different constant current sources are connected with different selection units, and the output end of each selection unit is connected with at least two output channels; each output channel comprises at least one output end, each output end of the output channel is connected with a light emitting diode in the display panel, and different output ends of the same output channel are connected with the light emitting diodes in different scanning units;
the input end of the constant current source is used for receiving a control signal and outputting a driving current corresponding to the control signal to the selection unit connected with the constant current source through the output end of the constant current source;
the selection unit is used for determining a target output channel from at least two output channels connected with the selection unit according to the control signal and outputting the driving current to the corresponding light-emitting diode through the output end of the target output channel;
the selection unit comprises a plurality of switch circuits and is connected through the switch in each switch circuit; the switching circuit in the selection unit comprises at least two stages, each stage of switching circuit comprises a plurality of single-pole double-throw switching circuits, the first stage of switching circuit comprises a single-pole double-throw switching circuit and is directly connected with the output end of the constant current source, the number of the single-pole double-throw switching circuits in other stages of switching circuits is sequentially increased, the input end of the single-pole double-throw switching circuit is connected with one output end of the upper stage of single-pole double-throw switching circuit, and the output ends of the single-pole double-throw switching circuits are respectively connected with the input ends of two lower stage of single-pole double-throw switching circuits.
2. The constant current drive circuit according to claim 1, wherein the light emitting diodes in the display panel are driven in common anode or in common cathode.
3. The constant current drive circuit according to claim 1, wherein the display panel is a direct display panel in which display is performed by direct light emission of a light emitting diode, or a backlight panel in which a light emitting diode is used as a backlight.
4. The constant current drive circuit according to claim 1, wherein the control signal includes a drive control signal for controlling a magnitude of the drive current output from the constant current source, and a timing control signal for controlling the selection unit to determine the target output channel.
5. The constant current driving circuit as claimed in claim 1, wherein each of said single-pole double-throw switch circuits comprises two mos transistors sharing a common gate in a pair, one of which is P-type and the other of which is N-type, and a timing control signal of said control signals is inputted to both of the mos transistors through the gates; the timing control signal comprises high and low levels, and the opening and the closing of the metal oxide semiconductor field effect transistors in the pair are controlled through the high and low levels.
6. The constant current drive circuit according to any one of claims 1 to 4, wherein the display panel includes a plurality of light emitting diode lamp blocks including a plurality of light emitting diodes arranged in an array, and in each light emitting diode lamp block, the output terminal of a single selection unit is connected to all the same color light emitting diodes in the same scanning unit.
7. A display panel comprising a plurality of light emitting diodes, and the constant current driving circuit according to any one of claims 1 to 6.
8. The display panel of claim 7, wherein the display panel comprises a plurality of led light blocks, each of the led light blocks comprises a plurality of leds arranged in an array, and wherein each of the led light blocks has a scan array in a horizontal direction and a drive array in a vertical direction; the scanning array comprises a plurality of scanning units, and the light emitting diodes in the same scanning unit are controlled by the driving currents of different constant current sources at the same time; and the output end of the constant current driving circuit is connected to the light emitting diode and provides driving current for the light emitting diode.
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| TW201220942A (en) * | 2010-11-02 | 2012-05-16 | Chunghwa Picture Tubes Ltd | Backlight module and driving citcuit |
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| JP5608394B2 (en) * | 2010-03-09 | 2014-10-15 | 株式会社ジャパンディスプレイ | Liquid crystal display |
| CN109559676A (en) * | 2018-12-18 | 2019-04-02 | 深圳市奥拓电子股份有限公司 | LED display driver circuit and LED display |
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| TW200828213A (en) * | 2006-12-22 | 2008-07-01 | Coretronic Suzhou Corp | Backlight module and light-emitting diode driving circuit thereof |
| TW201220942A (en) * | 2010-11-02 | 2012-05-16 | Chunghwa Picture Tubes Ltd | Backlight module and driving citcuit |
| CN103247279A (en) * | 2013-05-13 | 2013-08-14 | 深圳市华星光电技术有限公司 | Light source driving circuit of light emitting diode and backlight module |
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