TWI384441B - Driving-control device and method of backlight module - Google Patents

Description

Driving control device and driving control method of backlight module

The invention relates to a driving control device and a driving control method for a backlight module, in particular to a driving control device and a driving control method for a backlight module having a sequential flash function.

At present, the use of liquid crystal display devices is more and more common. In addition to being used as a general computer monitor, it can also be used as a touch screen for human-machine interface, and can also be used as a television in combination with a video system. However, although liquid crystal displays are becoming more and more popular, there are some technical problems that need to be further solved, such as wide viewing angle problems, contrast problems, color saturation problems, and reaction time speeds.

With the development of technology, the above problems have gradually improved significantly, but there is still room for improvement in terms of reaction time speed. The reason why the industry is vigorously developing new technologies in response time speed is that the liquid crystal display device has an animated display effect of a cathode ray tube (CRT) display device. However, the conventional liquid crystal display device cannot achieve the animation display effect of the CRT. In addition to the limitation of the reaction time speed, another important factor is that the image display mode of the CRT display device belongs to the pulse type display mode (impulse-type). Display), and the image display mode of the conventional liquid crystal display device belongs to a hold-type display.

The pulse type display mode does not obscure the blurring phenomenon caused by moving the object in the screen due to the human eye. In the continuous display mode, when the animation is displayed, the display is blurred due to the human eye tracking the moving object on the screen.

In order to solve the blur phenomenon, recently, some industry experts have proposed Sequential Flashing technology to solve the phenomenon of picture blur. The sequential flash technology sequentially clicks and turns off the light-emitting units that are the backlights of the liquid crystal display device in a frame time, and simulates the pulse-type display mode in a flashing manner by the light-emitting unit.

However, the conventional method generally performs an action of phase shifting a driving signal for driving the illumination of each of the light-emitting units in an analog circuit manner, which requires a large number of, for example, resistors, capacitors, diodes, transistors, and comparisons. Electronic components such as an amplifier or an operational amplifier can be realized. More specifically, the effect of phase shifting is achieved by using a relatively large number of electronic components to form a complex array phase delay loop, so as to increase the wiring density or the required area of the driver circuit board for generating the driving signal. In addition, it also causes the complexity of circuit design.

In view of the above, how to provide a driving control device and a driving control method for a backlight module capable of simplifying circuit design to reduce the image blurring phenomenon of the liquid crystal display device is one of the current important topics.

In view of the above problems, an object of the present invention is to provide a drive control device and a drive control method for a backlight module that can simplify circuit design.

In order to achieve the above object, a driving control device for a backlight module according to the present invention receives a digital pulse signal, and the driving control device includes an activation signal generating unit, a counting unit, a memory unit, and a Comparison unit and a drive unit. The start signal generating unit generates a digital start signal according to the first digital pulse signal; the counting unit is electrically connected to the start signal generating unit, and sequentially generates a count value according to the digital start signal; the memory unit stores at least one target The counting unit is electrically connected to the counting unit and the memory unit respectively. When the counting unit count value is equal to the memory unit storage target counting value, a trigger signal is generated; the driving unit is electrically connected to the comparing unit, and respectively The trigger signal sequentially outputs a sequential delay drive signal.

In addition, in order to achieve the above object, a driving control method for a backlight module according to the present invention includes: generating a digit start signal according to a digital pulse signal; sequentially generating a count value according to the digital enable signal; comparing the count value with at least a target count value, in order to generate a trigger signal; and sequentially output a sequential delay drive signal according to the trigger signal.

According to the above, the driving control device and the driving control method of the backlight module according to the present invention use the comparing unit to compare the count value generated by the counting unit with the target count value stored in the memory unit to sequentially generate the delay driving. The signal, therefore, when the plurality of light-emitting units of the backlight module are driven by the delayed driving signal, the light-emitting unit can be sequentially illuminated, so that the light-emitting unit turns on and turns off in turn, in other words, the backlight module according to the present invention The drive control device and the drive control method can simulate the pulse type display mode with a simple digital circuit design, thereby reducing the occurrence of blurring.

Hereinafter, a drive control device and a drive control method of a backlight module according to a preferred embodiment of the present invention will be described with reference to related drawings.

Referring to FIG. 1 and FIG. 2, the driving control device 2 of the backlight module of the preferred embodiment of the present invention includes an activation signal generating unit 21, a counting unit 22, a memory unit 23, a comparing unit 24, and a Drive unit 25. The driving control device 2 receives a first digital pulse signal Bs1 and outputs a sequential delay driving signal group Ps to a plurality of light emitting units 3, wherein the light emitting unit 3 can be a cold cathode fluorescent lamp. A hot cathode fluorescent lamp or a light emitting diode or the like. In the present embodiment, the drive control device 2 is exemplified by driving six light-emitting units 3.

In this embodiment, the enable signal generating unit 21 generates the digital enable signal Ss1 according to one of the first digital pulse signals Bs1 to start the trigger edge Ed1 (as shown in FIG. 2), and according to one of the first digital pulse signals Bs1. The trigger edge Ed2 is ended to generate a digital off signal Ss2.

The counting unit 22 is electrically connected to the activation signal generating unit 21, and the counting unit 22 starts counting after receiving the digital activation signal Ss1, wherein the counting value is Cv. For example, if the counting unit 22 is 4 bits, it can be sequentially counted up to 1111 by 0000. If the counting unit 22 is 2 bits, the counting can be started from 00 to 11. In this embodiment, a 2-bit counting unit is taken as an example. In addition, when the counting unit 22 receives the digital off signal Ss2, it also starts counting. In the present embodiment, the counting unit 22 can also be implemented using a timer.

The memory unit 23 stores at least one target count value TCv. If the counting unit 22 is 4 bits, the target count value TCv may be between 0000 and 1111. If the counting unit 22 is 2 bits, the target count value TCv may be Between 00 and 11.

The comparison unit 24 is electrically connected to the counting unit 22 and the memory unit 23, respectively. When the count value Cv is equal to the target count value TCv, the comparison unit 24 sequentially generates a trigger signal Tr. After the trigger signal Tr is generated, the counting unit 22 is then reset to zero, that is, after the counting unit 22 receives the trigger signal Tr output by the comparing unit 24, it starts counting again from 00. In this example, the driving of the six lighting units 3 is taken as an example, so the trigger signal Tr includes six start trigger signals Tr1 to Tr6 and six off trigger signals Tr7 to Tr12.

The driving unit 25 is electrically connected to the comparing unit 24, and outputs a sequential delay driving signal group Ps according to the trigger signal Tr, wherein each of the delayed driving signals has a time difference. The driving unit 25 sequentially outputs six delayed driving signals Ps1 to Ps6, and drives the six light emitting units 3 respectively, so that the light emitting unit 3 is turned on and off.

The driving unit 25 starts the delayed driving signal Ps1 after receiving the start trigger signal Tr1, and then sequentially receives the start trigger signals Tr2 to Tr6, sequentially starts a plurality of delayed driving signals Ps2 to Ps6, and then drives the unit. After receiving the close trigger signal Tr7, the 25 series ends the delayed drive signal Ps1, and then sequentially receives the close trigger signals Tr8 to Tr12, and sequentially terminates the delayed drive signals Ps2 to Ps6.

Referring to FIG. 3 again, the driving unit 25 of the driving control device 2 of the backlight module of the preferred embodiment of the present invention further includes a set of register groups 251 and a logic gate array 252. The register group 251 is electrically connected to the logic gate array 252. The register group 251 sequentially outputs a second digital pulse signal Bs2 according to the trigger signal Tr, and the logic gate array 252 is based on the second digital pulse signal Bs2 and a digital pulse width modulation signal (PWM) S _PWM. To generate a sequential delay driving signal group Ps. The frequency of the second digital pulse signal Bs2 is less than the frequency of the digital pulse width modulation signal S _PWM . For example, the frequency of the second digital pulse signal Bs2 is 120 Hz, and the frequency of the digital pulse width modulation signal S _PWM is 50 kHz.

Referring to FIG. 4, the logic gate array 252 comprises six AND gate _{(AND gate) G 1 ~ G} 6, the second digital pulse train signal Bs2 register group 251 are input to the output of the AND gate G ₁ ~ G ₆ , and the digital pulse width modulation signal S _{PWM is} also input to the gates G ₁ ~ G _{6 respectively} , and the gates G ₁ ~ G ₆ can be based on the second digital pulse signal Bs2 and the digital pulse width modulation signal S _PWM The phase shift drive signal group Ps is output.

Referring to FIG. 5 and FIG. 6 , another aspect of the driving control device of the backlight module according to the preferred embodiment of the present invention includes the startup signal generating unit 21 , the counting unit 22 , the memory unit 23 , and the like, Comparison unit 24 and drive unit 25. The driving unit 25 further receives the first digital pulse signal Bs1, and the trigger signal Tr output by the comparing unit 24 only includes the start trigger signals Tr1 Tr Tr6 (as shown in FIG. 5 ), and the driving unit 25 receives the signals in sequence. After the trigger signals Tr1 to Tr6 are started, the second and second digital pulse signals Bs1 are sequentially output according to the trigger signals Tr1 to Tr6. Digital pulse signal Bs2.

Referring to FIG. 7 again, the driving control method of the backlight module according to the preferred embodiment of the present invention includes the following steps: Step S01 is based on a first digital pulse signal to generate a digital start signal; step S02 According to the digital start signal, a count value is sequentially generated; step S03 is to compare the count value with at least one target count value TCv to sequentially generate a trigger signal; step S04 is to sequentially output a sequential delay drive signal according to the trigger signal.

The detailed driving control method and the changing manner have been described in the above embodiments, and thus will not be further described herein.

In summary, the driving control device and the driving control method of the backlight module according to the present invention use the comparing unit to compare the count value generated by the counting unit with the target count value stored in the memory unit to sequentially generate the delay driving. The signal, therefore, when the plurality of light-emitting units of the backlight module are driven by the delayed driving signal, the light-emitting unit can be sequentially illuminated, so that the light-emitting unit turns bright and dark.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

2. . . Driving control device for backlight module

twenty one. . . Start signal generation unit

twenty two. . . Counting unit

twenty three. . . Memory unit

twenty four. . . Comparison unit

25. . . Drive unit

251. . . Scratchpad group

252. . . Logic gate array

3. . . Light unit

Bs1. . . First digital pulse signal

Bs2. . . Second digit pulse signal

G ₁ ~G ₆ ‧‧‧ and gate

Ss1‧‧‧ digital start signal

Ss2‧‧‧ digital turn off signal

S _PWM ‧‧‧ digital pulse width modulation signal

Ed1‧‧‧Starting trigger edge

Ed2‧‧‧End trigger edge

Cv‧‧‧ count value

TCv‧‧‧ target count value

Tr‧‧‧ trigger signal

Tr1~Tr6‧‧‧ start trigger signal

Tr7~Tr12‧‧‧ Turn off the trigger signal

Ps‧‧‧Sequence Delay Drive Signal Group

Ps1~Ps6‧‧‧delay drive signal

S01~S04‧‧‧Driver control method flow of backlight module

1 is a schematic diagram showing a backlight module driving control device according to a preferred embodiment of the present invention; FIG. 2 is a timing diagram showing signals of the backlight module driving control device according to FIG. 1; FIG. 4 is a schematic diagram showing a logic gate array of the driving unit of FIG. 3; FIG. 5 is a schematic diagram showing a driving gate of a backlight module according to a preferred embodiment of the present invention; FIG. FIG. 6 is a timing diagram showing signals of the backlight module driving control device according to FIG. 5; and FIG. 7 is a view showing a signal according to a preferred embodiment of the present invention. A flow chart of a driving control method for a backlight module.

2. . . Driving control device for backlight module

twenty one. . . Start signal generation unit

twenty two. . . Counting unit

twenty three. . . Memory unit

twenty four. . . Comparison unit

25. . . Drive unit

3. . . Light unit

Bs1. . . First digital pulse signal

Ss1. . . Digital start signal

Cv. . . Count value

TCv. . . Target count value

Tr. . . Trigger signal

Ps. . . Sequential delay drive signal group

Claims (19)

A driving control device for a backlight module, which receives a first digital pulse signal, the driving control device includes: an activation signal generating unit, which generates a digital activation signal according to the first digital pulse signal; a counting unit, And the activation signal generating unit is electrically connected, and sequentially generates a count value according to the digital start signal; a memory unit stores at least one target count value; and a comparison unit is respectively associated with the counting unit and the memory The unit is electrically connected, and sequentially generates a trigger signal according to the count value and the target count value; and a driving unit is electrically connected to the comparing unit, and sequentially outputs a sequential delay according to the trigger signal Drive signal. The drive control device of claim 1, wherein each of the delayed drive signals has a time difference. The driving control device of claim 1, wherein the counting unit is electrically connected to the comparing unit, and receives the trigger signal to reproduce the counting value in sequence. The driving control device of claim 1, wherein the driving unit comprises: a register group, sequentially outputting a second digital pulse signal according to the trigger signals; and a logic gate array, The system is electrically connected to the register group, and according to the second digital pulse signal and a digital pulse width modulation signal, The delayed drive signal is generated. The drive control device of claim 4, wherein the logic gate array comprises a plurality of gates. The driving control device of claim 4, wherein the frequency of the second digital pulse signal is less than the frequency of the digital pulse width modulation signal. The driving control device according to claim 1, further comprising a plurality of light emitting units, wherein the driving units sequentially transmit the delayed driving signals to the light emitting units. The driving control device of claim 7, wherein the lighting unit is a cold cathode fluorescent lamp, a hot cathode fluorescent lamp or a light emitting diode. The driving control device of claim 1, wherein the trigger signal comprises a start trigger signal and a turn-off trigger signal. The driving control device of claim 9, wherein the driving unit activates a delayed driving signal according to the start trigger signal, and ends the delayed driving signal according to the closing trigger signal. The driving control device of claim 1, wherein the driving unit sequentially generates the delayed driving signal according to the trigger signal and the first digital pulse signal. A driving control method for a backlight module, comprising: generating a digit start signal according to a first digital pulse signal; And generating a count value according to the digital start signal; comparing the count value with the at least one target count value to sequentially generate a trigger signal; and sequentially outputting a sequential delay drive signal according to the trigger signals. The driving control method according to claim 12, wherein the trigger signal is generated when the count value is equal to the target count value. The driving control method according to claim 12, further comprising the step of re-sequencing the counting value according to the trigger signal. The driving control method according to claim 12, further comprising the step of sequentially outputting a second digital pulse signal according to the trigger signals. The driving control method of claim 15, further comprising the step of sequentially generating the delayed driving signal according to the second digital pulse signal and a digital pulse width modulation signal. The driving control method of claim 12, wherein the trigger signal comprises a start trigger signal, and a delayed drive signal is activated accordingly. The driving control method of claim 12, wherein the trigger signal comprises a shutdown trigger signal, and a delayed drive signal is terminated accordingly. The driving control method according to claim 12, further comprising the step of sequentially transmitting the delayed driving signals to the plurality of light emitting units.