CN101995005A - Back light module and liquid crystal display system using same - Google Patents
Back light module and liquid crystal display system using same Download PDFInfo
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- CN101995005A CN101995005A CN200910164088XA CN200910164088A CN101995005A CN 101995005 A CN101995005 A CN 101995005A CN 200910164088X A CN200910164088X A CN 200910164088XA CN 200910164088 A CN200910164088 A CN 200910164088A CN 101995005 A CN101995005 A CN 101995005A
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Abstract
The invention discloses a back light module with even luminance and a liquid crystal display system using the same. The back light module comprises a pulse width fine tuning circuit, a light source driver and a light source module which are electrically connected, wherein the light source driver is used for driving the light source module to give out light; the pulse width fine tuning circuit comprises a first inverting element, an RC lowpass filtering circuit and a second inverting element which are successively connected, wherein the RC lowpass filtering circuit comprises an adjustable resistor; when a pulse modulating signal is input to the pulse width fine tuning circuit, the resistance value of the adjustable resistor is adjusted to reduce the pulse width of the pulse modulating signal; and the pulse modulating signal adjusted by the pulse width fine tuning circuit is transferred to the light source driver so as to adjust the luminance of the light source module.
Description
Technical field
The present invention relates to a kind of module backlight, relate in particular to a kind of even brightness module backlight and use the liquid crystal display systems of this module backlight.
Background technology
Continuous development along with electronic technology, at present, LCD (Liquid Crystl Display, LCD) because have the little and lightweight advantage of volume, gradually, replace the comparatively huge cathode-ray tube of traditional volume (Cathode Ray Tube, CRT), and then used by society at large, be widely used in electronic products such as monitor, notebook computer, digital camera and projector especially.The LCD module generally comprises a display panels, a module backlight and a printed circuit board (PCB) (PCB).Wherein, module backlight is the important component part of LCD, and therefore, the demand that the market demand of LCD will inevitably drive module backlight continues to grow up.
In module backlight, because of Light-Emitting Diode (light-emitting diode, LED) backlight has life-span length, colored expressive ability reaches advantages such as environmental protection by force, makes the LED-backlit module have huge market prospects, also will become the main flow trend of LCD module backlight gradually.Existing LED-backlit module comprises that a led array and at least one LED drive chip.Because the influence of LED self parameter and the factors such as environment of dispatching from the factory thereof, the phenomenon of brightness disproportionation can appear in LED-backlit module usually.
As shown in Figure 1, existing one module 100 backlight comprises that the PWM output control module 11, the LED that electrically connect successively drive chip 12 and led array module 13.Enable (EN) that described PWM output control module 11 is connected to LED driving chip 12 holds, and described LED drives the output (V of chip 12
Out) end and feedback (FB) end connect the anode and the negative electrode of described led array module 13 respectively.The negative electrode of described led array module 13 couples a load resistance RL, this load resistance RL ground connection.In the use, described PWM output control module 11 drives the pwm signal of chip 12 input one specific pulsewidths (is 25% as dutycycle) to LED, then flows through respectively to go here and there electric current I in the LED loop
L1Pulsewidth can be consistent with the pulsewidth of formerly importing pwm signal, still dutycycle is 25%, and can not adjust, and every string peak point current can be controlled adjustment, this peak point current is by FB terminal voltage V
FB/ resistance (R
L) obtain.
Generally, the uniformity adjustment of LED luminosity can be divided into the two kinds of methods of pulse bandwidth and adjustment amplitude size that flow through the LED electric current of adjusting.Yet the electric current pulse bandwidth that flows through LED is decided by system's input size, and used chip still can not be adjusted.In addition, amplitude size to the LED electric current of flowing through is adjusted, because following factor, exact value is conditional: on the one hand, the FB terminal voltage VFB that LED drives chip 12 has ± 1.5% error, the resistance of its setting has ± 1% error, and this peak point current that will cause led array module 13 to be set not is just the same to all settings backlight; On the other hand, the relation of injection peak point current and colourity also can influence accuracy.
As seen, the effect that prior art is adjusted the luminance uniformity of LED-backlit module is very limited, yet, the brightness uniformity coefficient substantial connection of LED-backlit module performance and the market prospects of LCD, therefore, the luminance uniformity adjustment problem of LED-backlit module becomes one of problem that must solve of each big LCD manufacturer.
Summary of the invention
The objective of the invention is to, provide a kind of even brightness module backlight.
In addition, also provide a kind of liquid crystal display systems with this module backlight.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.
A kind of module backlight that is used for electronic installation, it comprises a pulse width trimming circuit, a light source drive and a light source module of electric connection.It is luminous that this light source drive is used to drive this light source module.This pulse width trimming circuit comprises one first negater, a RC low-pass filter circuit and one second negater that connects successively.Described RC low-pass filter circuit comprises an adjustable resistance, when a pulse-width signal inputs to the pulse width trimming circuit, reduce the pulsewidth of this pulse-modulated signal by the resistance of adjusting described adjustable resistance, transfer to described light source drive through the adjusted pulse-modulated signal of pulse width trimming circuit, to adjust the brightness of light source module.
In the above-mentioned module backlight, described light source module is a led array module.
Above-mentioned module backlight also comprises a pulse-width signal output control module, and this pulse-width signal output control module and pulse width trimming circuit electrically connect, and are used to export described pulse-width signal to the pulse width trimming circuit.Described pulse-width signal exports the pulse width trimming circuit to by electronic apparatus system.
In the above-mentioned module backlight, described first negater and second negater are a not gate.
In the above-mentioned module backlight, described light source drive comprises an Enable Pin, an output and a feedback end, import from Enable Pin through the adjusted pulse-modulated signal of pulse width trimming circuit, export the light source module to from output, described feedback end connects the load resistance of a ground connection, and the electric current of this load resistance of flowing through is relevant with the high-high brightness of light source module.
Described module backlight is adjusted the resistance value of RC low-pass filter circuit in this PWM trimming circuit by connecting a PWM trimming circuit, and the pwm signal that system is imported carries out the pulsewidth fine setting.Under the prerequisite that does not change the LED-backlit high-high brightness, brightness is evenly adjusted to LED-backlit, thereby the brightness that realizes module backlight is even.
The module backlight that the present invention also provides another kind to be used for electronic installation, it comprises a pulse width trimming circuit, with two or more light source drives and two or more light source modules of described pulse width trimming circuit electric connection.These two or more light source drives are to should two or more light source modules and to drive corresponding light source module luminous.This pulse width trimming circuit comprises one first negater, a RC low-pass filter circuit and one second negater that connects successively.Described RC low-pass filter circuit comprises an adjustable resistance, when a pulse-width signal inputs to the pulse width trimming circuit, reduce the pulsewidth of this pulse-modulated signal by the resistance of adjusting described adjustable resistance, the pulse width trimming circuit is exported adjusted pulse-modulated signal to described two or more light source drives, to adjust the brightness of described two or more light source modules.
In the above-mentioned module backlight, described two or more light source modules are the led array module.
Above-mentioned module backlight also comprises a pulse-width signal output control module, and this pulse-width signal output control module and pulse width trimming circuit electrically connect, and are used to export described pulse-width signal to the pulse width trimming circuit.Described pulse-width signal exports the pulse width trimming circuit to by electronic apparatus system.
In the above-mentioned module backlight, described first negater and second negater are a not gate.
In the above-mentioned module backlight, described each light source drive includes an Enable Pin, an output and a feedback end, import from Enable Pin through the adjusted pulse-modulated signal of pulse width trimming circuit, export the light source module to from output, described feedback end connects the load resistance of a ground connection, and the high-high brightness of the light source module that the electric current of this load resistance of flowing through and this light source drive are corresponding is relevant.
Described module backlight is adjusted the resistance value of RC low-pass filter circuit in this PWM trimming circuit by connecting a PWM trimming circuit, and the pwm signal that system is imported carries out the pulsewidth fine setting.Under the prerequisite that does not change the LED-backlit high-high brightness, brightness is evenly adjusted to LED-backlit, thereby the brightness that realizes module backlight is even.
A kind of liquid crystal display module, it comprises a display panels and the described module backlight of above-mentioned any one scheme, described display panels electrically connects with this module backlight.
The module backlight of described liquid crystal display systems is adjusted the resistance value of RC low-pass filter circuit in this PWM trimming circuit by connecting a PWM trimming circuit, and the pwm signal that system is imported carries out the pulsewidth fine setting.Under the prerequisite that does not change the LED-backlit high-high brightness, brightness is evenly adjusted to LED-backlit, thereby the brightness that realizes module backlight is even.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the module diagram of module backlight of the prior art.
Fig. 2 is the Organization Chart of the better embodiment of module backlight of the present invention.
Fig. 3 is the circuit diagram of PWM trimming circuit shown in Figure 2.
Fig. 4 is a pwm signal through being denoted as the oscillogram of 4 of A1, B1, C1, D1 among Fig. 3.
Fig. 5 is the Organization Chart of another better embodiment of module backlight of the present invention.
Fig. 6 is the another kind of connection diagram of module backlight shown in Figure 5.
100,200: module 11 backlight, 21:PWM output control module
12,22:LED drives chip 13,23:LED array module
221:LED drives chip A 223:LED and drives chip B
232:LED array module first area 232 234:LED array module second areas
241: the first negaters of 24:PWM trimming circuit
243: the second negaters
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, module backlight that foundation the present invention is proposed and the liquid crystal display systems that uses this module backlight, its specific embodiment, structure, feature and effect thereof, describe in detail as after.
See also Fig. 2 and shown in Figure 3, a preferred embodiment of module backlight of the present invention is applied to a liquid crystal display systems, and this module 200 backlight comprises a PWM trimming circuit 24, a light source drive and a light source module that electrically connects successively.In the present embodiment, this light source module comprises a led array module 23, and this light source drive comprises that a LED drives chip 22.It is luminous that described LED driving chip 22 is used for driving LED array module 23.
Enable (EN) that described PWM trimming circuit 24 is connected to LED driving chip 22 holds, and described LED drives the output (V of chip 22
Out) end and feedback (FB) end connect the anode and the negative electrode of described led array module 23 respectively.The negative electrode of described led array module 23, also promptly the FB end of this LED driving chip 22 couples a load resistance R
L, and this load resistance R
LGround connection.
As shown in Figure 3, described PWM trimming circuit 24 comprises one first negater 241, a RC low-pass filter circuit and one second negater 243 that electrically connects successively.In the present embodiment, this first and second negater 241,243 is a not gate.Described RC low-pass filter circuit comprises the capacitor C of an adjustable resistance R and a ground connection, when PWM output control module 21 is exported a pwm signal to PWM trimming circuit 24, can reduce the pulsewidth of this pwm signal by the resistance of adjusting described adjustable resistance, transfer to described LED through PWM trimming circuit 24 adjusted pwm signals and drive chip 22, to adjust the brightness of led array module 23.Said PWM output control module 21 can be the system of electronic installations such as notebook computer.
Please further consult Fig. 4, be the waveform of pwm signal among Fig. 34 of A1, B1, C1, D1.At first, PWM output control module 21 outputs one PWM pulse wave signal is at the A1 point, and this pulse wave signal is earlier reverse through first negater 241, forms the waveform that B1 is ordered; Make the rising/trailing edge of this pulse wave that delay phenomenon be arranged via the RC low-pass filter circuit again, form the waveform that C1 is ordered; The last adjustment that produces the inside reduction of PWM pulse wave again through second negater 243 forms the waveform output that D1 is ordered.The waveform that the waveform that this D1 is ordered is ordered with respect to A1, the adjustment of contracting in the pulsewidth generation a little, and amplitude is constant.
The waveform of being ordered by C1, A1 and D1 among Fig. 4 contrasts as can be seen, it is the waveform trailing edge delay of being ordered by C1 that the PWM waveform of output is adjusted, this signal delay is that the generation time that discharges and recharges by the RC circuit postpones and causes, therefore, the relation of resistance and electric capacity can be expressed as equation T=RC in time delay T and the RC circuit.That is, the value of adjustment resistance R can make and allow the pulsewidth of pwm signal that trimming movement is arranged.
With one group of experimental data technique effect of the present invention is described, importing a dutycycle is 50%, frequency is the pwm signal of 200Hz, output duty cycle is respectively 49%, 48%, 47% signal, be that dutycycle reduces at 1%, 2%, 3% o'clock, the value of T time delay that experimental measurement obtains, resistance R, capacitor C is as shown in the table:
| Dutycycle reduces ratio | T(μs) | R(ohm) | C(nf) |
| 1％ | 56 | 400 | 140 |
| 2％ | 119 | 812 | 146 |
| 3％ | 172 | 1.195K | 143 |
The pwm signal of said PWM trimming circuit 24 outputs exports led array module 23 from the EN end input that LED drives chip 22 to from the Vout end.The adjustment of contracting in taking place a little via the pulsewidth of the electric current I L1 of every row LED with respect to the pulsewidth of the pwm signal of PWM output control module 21 outputs, and amplitude remains unchanged, by FB terminal voltage V
FB/ resistance (R
L) obtain.Therefore, the high-high brightness of LED-backlit is constant, and the brightness of fine-tuning led array module 23 zoness of different, thereby makes the brightness of led array module 23 even.
See also shown in Figure 5ly, another embodiment of module 200 backlight of the present invention comprises that a plurality of LED drive chips, and these a plurality of LED drive chips and are respectively applied for the LED-backlit that drives zones of different.Drive chip with two LED and illustrate, but module backlight 200 of the present invention is not subjected to these two LED to drive the restricted number of chip, can also be plural other numbers.
This module 200 backlight comprises a PWM trimming circuit 24, drives chip A 221 and LED driving chip B 223 with this PWM trimming circuit 24 LED that are connected arranged side by side, drive the led array module first area 232 that chip A 221 is connected with LED, and drive the led array module second area 234 that chip B 223 is connected with LED.
Enable (EN) that described PWM trimming circuit 24 is connected to LED driving chip A 221 and LED driving chip B 223 holds, and described LED drives the output (V of chip A 221
Out) end and feedback (FB) end connect the anode and the negative electrode of described led array module first area 232 respectively.The negative electrode of described led array module first area 232, also promptly the FB end of this LED driving chip A 221 couples a load resistance R
LA, and this load resistance R
LAGround connection.Described LED drives the output (V of chip B 223
Out) end and feedback (FB) end connect the anode and the negative electrode of described led array module second area 234 respectively.The negative electrode of described led array module second area 234, also promptly the FB end of this LED driving chip B 223 couples a load resistance R
LB, and this load resistance R
LBGround connection.
When PWM output control module 21 is exported a pwm signal to PWM trimming circuit 24, can reduce the pulsewidth of this input pwm signal by the resistance of adjusting described adjustable resistance, transfer to described LED through PWM trimming circuit 24 adjusted pwm signals and drive chip A 221 and LED driving chip B 223, to adjust the brightness of led array module 23.The pwm signal of said PWM trimming circuit 24 outputs is imported from the EN end that LED drives chip A 221 and LED driving chip B 223, and the Vout end that drives chip A221 from LED exports led array module first area 232 to, via every electric current I that is listed as LED
LA1The pulsewidth adjustment of contracting in taking place a little with respect to the pulsewidth of the pwm signal of PWM output control module 21 output, and amplitude I
LABy FB terminal voltage V
FB/ resistance (R
LA) obtain, remain unchanged; Simultaneously, the pwm signal of PWM trimming circuit 24 outputs exports led array module second area 234 to from the Vout end that LED drives chip B 223, via the electric current I of every row LED
LB1The pulsewidth adjustment of contracting in taking place a little with respect to the pulsewidth of the pwm signal of PWM output control module 21 output, and amplitude I
LBBy FB terminal voltage V
FB/ resistance (R
LB) obtain, remain unchanged.Therefore, the high-high brightness of LED-backlit is constant, and the brightness of fine-tuning led array module first area 232 and second area 234, thereby makes the overall brightness of LED-backlit even.
Seeing also shown in Figure 6ly, is that LED drives the another kind of connected mode that chip A 221 and LED drive chip B 223 and led array module 23 among Fig. 5.LED shown in Fig. 6 drives chip A 221 and LED drives the different LED string that chip B 223 is connected in same led array module 23, to realize the subregion driving to led array module 23.
Fig. 5 and embodiment shown in Figure 6 are applicable to large scale liquid crystal display floater (as 17 " more than), and when needing a plurality of LED to drive chips the led array module is driven, the specification error that drives chip because of each LED makes I
LAWith I
LBHaving peak point current difference causes LED to drive the luminosity difference of chip A 221 and LED driving chip B 223 drivings, can finely tune the electric current pulse bandwidth by the way, come the difference of compensated peak electric current, thereby make the LED-backlit brightness of zones of different even.
In addition, the present invention also provides a kind of liquid crystal display systems with above-mentioned module backlight, and it comprises a display panels (figure does not show), and described display floater and described module backlight electrically connect.Described liquid crystal display systems is implemented in the electronic installation, and this electronic installation is a mobile phone, a digital camera, a personal digital assistant, a notebook computer, a TV, a vehicle-mounted screen or a portable media player.
In sum, the module backlight of preferred embodiment of the present invention and liquid crystal display systems with this module backlight are by connecting a PWM trimming circuit 24, adjust the resistance value of RC low-pass filter circuit in this PWM trimming circuit 24, the pwm signal that system is imported carries out the pulsewidth fine setting.Under the prerequisite that does not change the LED-backlit high-high brightness, brightness is evenly adjusted to LED-backlit, thereby the brightness that realizes module backlight is even.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (13)
1. module backlight that is used for electronic installation, it comprises a light source drive and a light source module of electric connection, it is luminous that this light source drive is used to drive this light source module, it is characterized in that: this module backlight also comprises a pulse width trimming circuit, this pulse width trimming circuit and described light source drive electrically connect, this pulse width trimming circuit comprises one first negater that connects successively, one RC low-pass filter circuit and one second negater, described RC low-pass filter circuit comprises an adjustable resistance, when a pulse-width signal inputs to the pulse width trimming circuit, reduce the pulsewidth of this pulse-modulated signal by the resistance of adjusting described adjustable resistance, transfer to described light source drive through the adjusted pulse-modulated signal of pulse width trimming circuit, to adjust the brightness of light source module.
2. module backlight according to claim 1 is characterized in that: described light source module is a led array module.
3. module backlight according to claim 1, it is characterized in that: described module backlight also comprises a pulse-width signal output control module, this pulse-width signal output control module and pulse width trimming circuit electrically connect, and are used to export described pulse-width signal to the pulse width trimming circuit.
4. module backlight according to claim 1 is characterized in that: described pulse-width signal exports the pulse width trimming circuit to by electronic apparatus system.
5. module backlight according to claim 1 is characterized in that: described first negater and second negater are a not gate.
6. module backlight according to claim 1, it is characterized in that: described light source drive comprises an Enable Pin, an output and a feedback end, import from Enable Pin through the adjusted pulse-modulated signal of pulse width trimming circuit, export the light source module to from output, described feedback end connects the load resistance of a ground connection, and the electric current of this load resistance of flowing through is relevant with the high-high brightness of light source module.
7. module backlight that is used for electronic installation, it comprises two or more light source drives and two or more light source modules of electric connection, these two or more light source drives are to should two or more light source modules and to drive corresponding light source module luminous, it is characterized in that: this module backlight also comprises a pulse width trimming circuit, this pulse width trimming circuit and described two or more light source drives electrically connect, this pulse width trimming circuit comprises one first negater that connects successively, one RC low-pass filter circuit and one second negater, described RC low-pass filter circuit comprises an adjustable resistance, when a pulse-width signal inputs to the pulse width trimming circuit, reduce the pulsewidth of this pulse-modulated signal by the resistance of adjusting described adjustable resistance, the pulse width trimming circuit is exported adjusted pulse-modulated signal to described two or more light source drives, to adjust the brightness of described two or more light source modules.
8. module backlight according to claim 7 is characterized in that: described two or more light source modules are the led array module.
9. module backlight according to claim 7, it is characterized in that: described module backlight also comprises a pulse-width signal output control module, this pulse-width signal output control module and pulse width trimming circuit electrically connect, and are used to export described pulse-width signal to the pulse width trimming circuit.
10. module backlight according to claim 7 is characterized in that: described pulse-width signal exports the pulse width trimming circuit to by electronic apparatus system.
11. module backlight according to claim 7 is characterized in that: described first negater and second negater are a not gate.
12. module backlight according to claim 7, it is characterized in that: described each light source drive includes an Enable Pin, an output and a feedback end, import from Enable Pin through the adjusted pulse-modulated signal of pulse width trimming circuit, export the light source module to from output, described feedback end connects the load resistance of a ground connection, and the high-high brightness of the light source module that the electric current of this load resistance of flowing through and this light source drive are corresponding is relevant.
13. a liquid crystal display systems, it comprises a display panels and a module backlight that electrically connects with this display panels, and it is characterized in that: this module backlight is the described module backlight of arbitrary claim in the claim 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910164088XA CN101995005A (en) | 2009-08-10 | 2009-08-10 | Back light module and liquid crystal display system using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910164088XA CN101995005A (en) | 2009-08-10 | 2009-08-10 | Back light module and liquid crystal display system using same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403769A (en) * | 2011-11-22 | 2012-04-04 | 华为技术有限公司 | Charging device |
| CN102800283A (en) * | 2012-08-24 | 2012-11-28 | 深圳市易事达电子有限公司 | LED drive chip |
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| CN108490716A (en) * | 2018-03-21 | 2018-09-04 | 上海艾为电子技术股份有限公司 | A kind of screen light filling circuit and electronic equipment |
| CN115484703A (en) * | 2022-10-31 | 2022-12-16 | 歌尔股份有限公司 | Remote controller backlight control method and device, remote controller and medium |
-
2009
- 2009-08-10 CN CN200910164088XA patent/CN101995005A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403769A (en) * | 2011-11-22 | 2012-04-04 | 华为技术有限公司 | Charging device |
| CN102800283A (en) * | 2012-08-24 | 2012-11-28 | 深圳市易事达电子有限公司 | LED drive chip |
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| US9892690B2 (en) | 2015-10-12 | 2018-02-13 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Control circuit for backlight, a control method and a liquid crystal display device |
| CN108490716A (en) * | 2018-03-21 | 2018-09-04 | 上海艾为电子技术股份有限公司 | A kind of screen light filling circuit and electronic equipment |
| CN115484703A (en) * | 2022-10-31 | 2022-12-16 | 歌尔股份有限公司 | Remote controller backlight control method and device, remote controller and medium |
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Application publication date: 20110330 |