CN201374846Y - A kind of backlight module and its liquid crystal display module - Google Patents

Abstract

The utility model discloses a backlight module and a liquid crystal display module thereof. The backlight module comprises a backlight source, a controller and a drive module, the backlight source is connected to the drive module, and the drive module is connected to the controller. , the drive module drives the backlight under the control of the controller to emit light with adjustable spectral curve; the liquid crystal display module includes the backlight module and the liquid crystal display module, and can make the backlight The module emits light whose spectral curve matches that of the color filter included in the liquid crystal display module. The spectral curve provided by the backlight module provided by the utility model has an adjustable property, so that through a certain adjustment, the spectral curve of the light emitted by the backlight can be made to be opposite to the spectral curve of the color filter included in the liquid crystal display module. Matching, which in turn improves the good reproducibility of its displayed colors.

Description

A kind of backlight module and its liquid crystal display module

【Technical field】

The utility model relates to a backlight module, and also relates to a liquid crystal display module including the backlight module. The liquid crystal display module has good color reproducibility.

【Background technique】

In recent years, liquid crystal display technology has developed rapidly, and liquid crystal displays have also become an important part of people's daily entertainment life. And along with the continuous improvement of people's quality of life, people also put forward higher and higher requirements for the display quality of liquid crystal displays.

Referring to Fig. 3, as we all know, a color liquid crystal display is mainly composed of an upper polarizer 101, a color filter plus an upper glass substrate 102 with ITO electrodes, an upper alignment layer 103, a liquid crystal layer 104, a lower alignment layer 105, and a lower glass substrate coated with ITO electrodes. 106 , a lower polarizer 107 and a backlight module 200 . The color saturation of a color liquid crystal display mainly depends on the matching of the spectral curve of the backlight source and the spectral curve of the color filter. In the state of the color liquid crystal display, the light is emitted by the backlight, and enters the human eye through the color filter. Among them, the wavelength range of light that can be used by the liquid crystal display depends on the backlight source, and the wavelength range of light that can be received by human eyes after passing through the liquid crystal display depends on the color filter. Traditional color liquid crystal displays use a backlight based on blue light-emitting diodes matching yellow phosphors, as shown in Figure 1, a schematic diagram of the spectral curve matching between a backlight based on blue light-emitting diodes matching yellow phosphors and a color filter of a color liquid crystal display , where a represents the spectral curve of the backlight, and b represents the spectral curve of the color filter. The spectral curve of the light emitted by the backlight has two peaks in the wavelength range of about 430nm to 450nm and 560nm to 630nm, while the color liquid crystal display The light transmittance of the color filter in these two wavelength ranges is relatively low, so that the light of some wavelengths cannot pass through the liquid crystal display and be received by the human eye, as shown in the area A in Figure 1, resulting in liquid crystal display The color saturation of the display is low.

At the same time, there have also been backlights in the industry that use blue light-emitting diodes to match red and green phosphors, as shown in Figure 2. Schematic diagram of spectral curve matching, where c represents the spectral curve of the backlight, and d represents the spectral curve of the color filter. The peak of the spectral curve provided by this backlight can be more effectively matched with the peak of the spectral curve of the color filter of the color liquid crystal display , as shown in Figure 2, area B is the light loss area. It can be seen that the use of backlight based on blue light-emitting diodes and yellow phosphors can more effectively improve the color saturation of color liquid crystal displays, but for different spectral curves The color filter of the color liquid crystal display needs to redevelop the backlight source to match it, which makes the matching and debugging of the backlight source and the color filter of the color liquid crystal display very complicated.

【Content of utility model】

An object of the utility model is to provide a backlight module with an adjustable spectral curve provided by it, and its technical solution is:

A backlight module, wherein the backlight module includes a backlight source, a controller, and a drive module, the backlight source is connected to the drive module, the drive module is connected to the controller, and the drive module is connected to the Under the control of the controller, the backlight source is driven to emit light with an adjustable spectral curve.

Compared with the problem that the spectral curve provided by the backlight module in the traditional technology does not have adjustability, the backlight module provided by the utility model provides a controller and a drive module, so that the instructions pre-stored in the controller or temporarily input to the drive The module issues control instructions to drive the backlight source in the backlight module to turn on and off, so as to achieve the purpose of controlling the adjustable spectral curve provided by it.

At the same time, another purpose of this utility model is to provide a liquid crystal display module with good color reproducibility, and its technical solution is:

A liquid crystal display module, the liquid crystal display module includes: a backlight module, and a liquid crystal display module, the liquid crystal display module is arranged above the backlight module, the liquid crystal display module includes a color filter, wherein the The backlight module includes a backlight source, a controller and a drive module, the backlight source is connected to the drive module, the drive module is connected to the controller, and the drive module drives the backlight under the control of the controller A source that emits light whose spectral curve matches that of the color filter.

The liquid crystal display module provided by the utility model is provided with a controller and a drive module, thereby sending a control command to the drive module through a command pre-stored in the controller or temporarily input, thereby driving the backlight in the backlight module Light on and off, so as to achieve the purpose of controlling the adjustable spectral curve provided by it, and extract the spectral curve of the color filter included in the liquid crystal display module by certain means, so that through certain adjustments, the backlight can be made The spectral curve of the emitted light is relatively matched with the spectral curve of the color filter included in the liquid crystal display module, thereby improving the good reproducibility of the displayed color.

The features and advantages of the utility model will be described in detail through embodiments in conjunction with the accompanying drawings.

【Description of drawings】

Fig. 1 is a schematic diagram of spectral curve matching between a backlight source based on a blue light-emitting diode and a color filter of a color liquid crystal display with a yellow phosphor powder;

Fig. 2 is a schematic diagram of spectral curve matching between a backlight source based on a blue light-emitting diode matching red and green phosphors and a color filter of a color liquid crystal display;

Fig. 3 is a schematic structural view of an embodiment of a liquid crystal display module provided by the present invention;

Fig. 4 is a schematic structural view of an embodiment of a backlight provided by the present invention;

Fig. 5 is a structural schematic diagram of an embodiment of the backlight source included in the backlight module provided by the utility model;

FIG. 6 is a schematic diagram of the signal waveform of the control signal provided by the backlight driver module provided by the present invention;

FIG. 7 is a schematic diagram of spectral curve matching between a backlight source based on red, green and blue light-emitting diodes and a color filter in the liquid crystal display module provided by the present invention.

【Detailed ways】

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

One object of the present invention is to provide a backlight module with adjustable spectral curves, and another object is to provide a liquid crystal display module with good color reproducibility, which is described in detail as follows:

Referring to FIG. 4 , a backlight module provided by the present invention includes a backlight 4 , a controller 1 and a drive module 2 , the backlight 4 is connected to the drive module 2 , and the drive module 2 is connected to the controller 1, the drive module 2 drives the backlight 4 under the control of the controller 1 to emit light with an adjustable spectral curve.

As shown in Figure 5, according to an embodiment of the backlight module provided by the utility model, the backlight 4 can be an LED lamp group 5, and the LED lamp group 5 includes a red light-emitting diode, a green light-emitting diode and a The blue light emitting diode, the red light emitting diode, the green light emitting diode and the blue light emitting diode are connected in parallel.

Or according to another embodiment of the backlight module provided by the present utility model, the backlight source includes a plurality of LED lamp groups 5, and each LED lamp group 5 includes a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, respectively. Light-emitting diodes, and the plurality of red light-emitting diodes included in the plurality of LED lamp groups 5 are connected in series to form a first series group, and the plurality of green light-emitting diodes included in the plurality of LED lamp groups 5 are connected in series to form a second series group, the plurality of blue light-emitting diodes included in the plurality of LED lamp groups 5 are connected in series to form a third series group, for example, the first series group is formed by a plurality of red light-emitting diodes in series, and the second series group A plurality of green light emitting diodes are connected in series, the third series group is formed by a plurality of blue light emitting diodes in series, and the first series group, the second series group and the third series group are connected in parallel.

For the above-mentioned two backlight embodiments, the single LED lamp group 5 or multiple LED lamp groups 5 are driven by the drive module 2, and the drive module 2 drives the The LED lamp group 5 is extinguished or illuminated according to a set rule, thereby achieving the purpose of controlling the adjustable spectral curve of the light emitted by the backlight source 4 . In a specific implementation process, the driving module 2 is preferably a diode current control chip, and the diode current control chip has at least one of an I ² C data interface or a serial data interface for data transmission.

The backlight module provided by the utility model is provided with a controller 1 and a drive module 2, thereby sending a control command to the drive module 2 through an instruction pre-stored in the controller 1 or temporarily input, thereby driving the backlight module described in the backlight module. The lighting and extinguishing of the backlight source 4 can achieve the purpose of controlling the adjustable spectral curve provided by it.

And in the actual situation, the LED lamp group 5 generates a large amount of heat during the process of emitting light, so that the temperature of the LED lamp group 5 changes, so that the spectral curve of the light emitted by it will slightly change. At this time, if the temperature sensor is not used for compensation control, the final mixed "white light" will deviate, and there will be color casts such as white and yellowish. In order to compensate the white color coordinate value at different temperatures, the backlight module provided by the utility model also includes a temperature sensor 3, as shown in Figure 4, the temperature sensor 3 is placed on the backlight 4 for sensing The real-time temperature of the LED lamp group 5 included in the backlight, and connected to the drive module 2, is used to feed back the sensed real-time temperature information to the drive module 2, and the temperature information is processed by the controller 1 Afterwards, it is used as a reference value for compensating the white color coordinate value.

The utility model provides a liquid crystal display module, the liquid crystal display module includes: a backlight module, and a liquid crystal display module, the liquid crystal display module is arranged above the backlight module, and the liquid crystal display module includes a color filter sheet, wherein the backlight module includes a backlight 4, a controller 1 and a driving module 2, the backlight 4 is connected to the driving module 2, the driving module 2 is connected to the controller 1, and the driving The module 2 drives the backlight source 4 under the control of the controller 1 to emit light whose spectral curve matches that of the color filter.

Similarly, as shown in Figure 5, the backlight can include one or more LED lamp groups 5, and when the included LED lamp group 5 is one, the LED lamp group 5 includes a red light-emitting diode, a green light-emitting diode and a blue light emitting diode, the red light emitting diode, the green light emitting diode and the blue light emitting diode are connected in parallel.

When the backlight includes a plurality of LED lamp groups 5, each LED lamp group 5 includes a red light emitting diode, a green light emitting diode and a blue light emitting diode, and the plurality of LED lamp groups 5 include A plurality of red light-emitting diodes are connected in series to form a first series group, and a plurality of green light-emitting diodes included in the plurality of LED lamp groups 5 are connected in series to form a second series group. The blue light-emitting diodes are connected in series to form a third series group, and the first series group, the second series group and the third series group are connected in parallel. In the specific implementation process, the driving module 2 is preferably a diode current control chip, and The diode current control chip has at least one of an I ² C data interface or a serial data interface for data transmission.

The liquid crystal display module provided by the utility model is provided with a controller 1 and a driving module 2, so as to send control instructions to the driving module 2 through instructions pre-stored in the controller 1 or temporarily input, thereby driving all the components in the backlight module. The lighting and extinguishing of the above-mentioned backlight source 4, so as to achieve the purpose of controlling the adjustable spectral curve provided by it, and extract the spectral curve of the color filter included in the liquid crystal display module by certain means, so that through certain adjustments, The spectral curve of the light emitted by the backlight source 4 can be relatively matched with the spectral curve of the color filter included in the liquid crystal display module, thereby improving the good reproducibility of the displayed color.

In addition, in a specific actual process, under different temperature conditions, a temperature sensor is used to compensate the white color coordinate value, so as to keep the white color coordinate value of the backlight source consistent at different temperatures. As shown in Figure 4, the controller 1 is connected to the drive module 2, the drive module 2 is connected to the backlight 4, and the temperature sensor 3 is placed on the backlight 4 and connected to the drive Module 2. The controller 1 transmits the programs or instructions pre-stored in the controller 1 or input to the controller 1 in real time through the ^I2C /SPI data interface to the drive module 2, and the drive module 2 provides The command and the signal fed back by the temperature sensor 3 output three voltage control signals R_OUT, G_OUT, and B_OUT to control the red, green, and blue light-emitting diodes respectively.

As shown in FIG. 6 , the signal waveforms of the three voltage control signals R_OUT, G_OUT, and B_OUT are all rectangular square waves. When the output of the control signal is at a high level, the light-emitting diode is turned on and emits light; when the output of the control signal is at a low level, the light-emitting diode is turned off and does not emit light. And each signal period T of the control signal remains unchanged, as long as the ratio of the output high level time to the output low level time within one signal period T is controlled, the light emitting time of the light emitting diode can be controlled. Simultaneously control the three voltage control signals of R_OUT, G_OUT, and B_OUT to obtain light with different red, green, and blue components, which can be combined to obtain output light with different spectral curves, and finally to control the spectrum of the light emitted by the backlight The purpose of the curve, thus by collecting the spectral curve of the color filter, such as using a spectrophotometer, the spectral curve can be matched reasonably, so that the saturation of the color displayed by the liquid crystal display module can be obtained. improved.

As shown in Figure 7, a backlight based on red, green, and blue light-emitting diodes is used as the backlight of the color liquid crystal display module. By adjusting the output of the diode current control chip, the peak value of the spectral curve of the light emitted by the backlight can be made The wavelength range is close to the wavelength range where the transmittance of the spectral curve of the color filter is relatively high (the dotted line in the figure represents the spectral curve of the backlight source, and the solid line represents the spectral curve of the color filter). Since the three colors of red, green, and blue are ternary colors, all the colors that can be recognized by human eyes in nature can be obtained through the combination of these three colors, so that the three primary colors of red, green, and blue can be used more effectively. Through the liquid crystal display, the number of colors that can be combined to form the liquid crystal display is greatly increased, and the number of colors that can be received by the human eye is also greatly increased, so that the color saturation of the color liquid crystal display can be effectively improved .

In order to better illustrate the advantages of the backlight module or liquid crystal display module provided by the utility model, a group of comparison methods and comparative data are provided here, as follows:

Select two identical LCD modules, and only use different backlight modules during the test to form two different LCD modules. The first group of LCD modules uses backlight based on blue light-emitting diodes and yellow phosphors. module, the second group of liquid crystal display modules adopts the backlight module provided by the utility model.

During the test, the BM-7 chromaticity tester was used to test the color saturation of the two groups of liquid crystal display modules, and the international CIE1931 chromaticity system (color mixing system calibrated by the International Commission on Illumination in 1931), which is widely used in display related industries, is used. Representation method) describes the test results. The color saturation test data of the two color liquid crystal display modules are shown in the table below:

It can be obtained from the test data in the table that the color saturation of the liquid crystal display module adopting the utility model is greatly improved compared with the color saturation of the traditional color liquid crystal display module.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A backlight module, characterized in that the backlight module includes a backlight source, a controller and a drive module, the backlight source is connected to the drive module, the drive module is connected to the controller, and the drive module The module drives the backlight source under the control of the controller to emit light with an adjustable spectral curve. 2. The backlight module according to claim 1, wherein the backlight source comprises an LED light group, and the LED light group comprises a red light-emitting diode, a green light-emitting diode and a blue light-emitting diode, the The red light emitting diode, the green light emitting diode and the blue light emitting diode are connected in parallel. 3. The backlight module according to claim 1, wherein the backlight source comprises a plurality of LED light groups, and each LED light group comprises a red light-emitting diode, a green light-emitting diode and a blue light-emitting diode respectively. Diodes, and the plurality of red light emitting diodes included in the plurality of LED lamp groups are connected in series to form a first series group, and the plurality of green light emitting diodes included in the plurality of LED lamp groups are connected in series to form a second series group, so The plurality of blue light-emitting diodes included in the plurality of LED lamp groups are connected in series to form a third series group, and the first series group, the second series group and the third series group are connected in parallel. 4. The backlight module according to any one of claims 1 to 3, further comprising a temperature sensor, the temperature sensor is placed on the backlight and connected to the driving module. 5. The backlight module according to claim 4, wherein the driving module is a diode current control chip, and the diode current control chip has at least one of an I ² C data interface or a serial data interface. 6. A liquid crystal display module, the liquid crystal display module includes: a backlight module, and a liquid crystal display module, the liquid crystal display module is arranged above the backlight module, the liquid crystal display module includes a color filter, and its features In that, the backlight module includes a backlight source, a controller, and a drive module, the backlight source is connected to the drive module, the drive module is connected to the controller, and the drive module is under the control of the controller The backlight source is driven to emit light whose spectral curve matches the spectral curve of the color filter. 7. The liquid crystal display module according to claim 6, wherein the backlight source includes an LED lamp group, and the LED lamp group includes a red light-emitting diode, a green light-emitting diode and a blue light-emitting diode, The red light emitting diodes, green light emitting diodes and blue light emitting diodes are connected in parallel. 8. The liquid crystal display module according to claim 6, wherein the backlight source includes a plurality of LED light groups, and each LED light group includes a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode. color light emitting diodes, and the plurality of red light emitting diodes included in the plurality of LED lamp groups are connected in series to form a first series group, and the plurality of green light emitting diodes included in the plurality of LED lamp groups are connected in series to form a second series group The plurality of blue light-emitting diodes included in the plurality of LED lamp groups are connected in series to form a third series group, and the first series group, the second series group and the third series group are connected in parallel. 9. The liquid crystal display module according to any one of claims 6 to 8, further comprising a temperature sensor, the temperature sensor is placed on the backlight and connected to the driving module. 10. The liquid crystal display module according to claim 9, wherein the driving module is a diode current control chip, and the diode current control chip has at least one of an I ² C data interface or a serial data interface kind.

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