CN103680420B - Display device - Google Patents

Abstract

The invention relates to a display, which includes a display panel, a backlight module and a backlight control circuit. The backlight module is used to provide a backlight source to the display panel, wherein the backlight module includes a first light source for providing a first color light and a second light source for providing a second color light. The backlight control circuit is coupled to the backlight module and is configured to control the backlight module to operate in one of the first display mode and the second display mode. When the backlight module operates in the first display mode, the backlight control circuit controls the first light source to provide the first color light as the backlight source during the picture period. When the backlight module operates in the second display mode, the backlight control circuit controls the first and second light sources to sequentially provide at least one of the first and second color light during the first sub-picture period and the second sub-picture period in the picture period. As a backlight source.

Description

monitor

technical field

The present invention relates to a display, and in particular to a display with switchable color saturation.

Background technique

Liquid Crystal Display (LCD) has gradually become the mainstream of display with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation. Since the liquid crystal display panel does not have the characteristic of self-illumination, a backlight module must be placed under the liquid crystal display panel to provide the light source required by the liquid crystal display panel. Traditional backlight modules can be roughly divided into two categories, one is a backlight module composed of cold cathode fluorescent lamps (CCFL), and the other is a backlight module composed of light emitting diodes (light emitting diodes, LED). Among them, since the LED backlight module can improve the color gamut of the liquid crystal display, most manufacturers now replace the cold-cathode tube backlight module with the LED backlight module.

For the color performance of a liquid crystal display, the color saturation of the display is usually measured by the standards set by the National Television System Committee (NTSC) of the United States. On the other hand, those with ordinary knowledge in the art usually use the sRGB or EBU specification as a reference for color adjustment when adjusting the red saturation, green saturation, and blue saturation of a liquid crystal display.

Generally speaking, in order to improve the color saturation of the display, there are usually two different methods under the current technology: (1) use a color filter layer with high color saturation in the display panel; (2) use high color rendering The light-emitting module is used as a backlight. However, both of the above-mentioned approaches have defects to a certain extent.

Specifically, if the method (1) is adopted, since the transmittance of the color filter layer with high color saturation is quite low, it is necessary to increase the driving power of the light-emitting module to maintain the luminous brightness of the display. If the method (2) is adopted, because it must be doped with a relatively high concentration of phosphors to achieve high color rendering properties, the luminous efficiency of the light-emitting module will be relatively poor, and the process tolerance will also be low. In other words, regardless of the method (1) or method (2), if you want to increase the color saturation of the display, you must face the problem of increased power consumption.

In addition, in some application scenarios (such as document processing), high color saturation image rendering is not necessary. Moreover, watching a picture with high color saturation for a long time may cause eye fatigue of the viewer.

Since the color saturation of the current display cannot be adjusted after design, the two characteristics of the display, such as the color saturation and power consumption performance, cannot be balanced by the current technology.

Contents of the invention

The present invention provides a display that can provide at least two display modes with different color saturation for viewers to choose from.

The display of the present invention includes a display panel, a backlight module and a backlight control circuit. The backlight module is disposed on the lower side of the display panel for providing backlight to the display panel, wherein the backlight module includes a first light source for providing first color light and a second light source for providing second color light. The backlight control circuit is coupled to the backlight module, and is configured to control the backlight module to operate in one of the first display mode and the second display mode. When the backlight module operates in the first display mode, the backlight control circuit controls the first light source to provide the first color light as the backlight during the screen period, and when the backlight module operates in the second display mode, the backlight control circuit controls the first and The second light source provides at least one of the first and second color lights as a backlight during the first sub-picture period and the second sub-picture period of the picture periods in sequence.

Based on the above, an embodiment of the present invention proposes a display that can provide two display modes with different color saturation for viewers to choose from. In a display mode with low color saturation, the backlight module can provide white light with high luminous efficiency as a backlight source to save power consumption of the display. In the display mode with high color saturation, the backlight module can provide corresponding color light as a backlight according to the color sequence of the picture data received by the display panel, thereby improving the color saturation of the display. Based on this, the display according to the embodiment of the present invention can use an appropriate display mode to display images according to the viewer's viewing needs, so as to balance the luminous efficiency and display quality of the display.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a display according to an embodiment of the present invention;

2 is a schematic diagram of a backlight module according to an embodiment of the present invention;

FIG. 3A is a schematic diagram of a backlight module operating in a first display mode according to an embodiment of FIG. 2;

FIG. 3B is a schematic diagram of a backlight driving sequence according to an embodiment of FIG. 3A;

FIG. 3C is a schematic diagram of the emission spectrum of the first color light according to an embodiment of FIG. 3A;

FIG. 4A is a schematic diagram of a backlight module operating in a second display mode according to an embodiment of FIG. 2;

FIG. 4B is a schematic diagram of a backlight driving sequence according to an embodiment of FIG. 4A;

FIG. 4C is a schematic diagram of the emission spectrum of the second color light according to an embodiment of FIG. 4A;

FIG. 4D is a schematic diagram of the emission spectrum of the second color light according to another embodiment of FIG. 4A;

5 is a schematic diagram of a backlight module according to another embodiment of the present invention;

FIG. 6A is a schematic diagram of the backlight driving sequence of the backlight module operating in the first display mode according to an embodiment of FIG. 5;

FIG. 6B is a schematic diagram of the emission spectrum of the third color light according to an embodiment of FIG. 5;

FIG. 7A is a schematic diagram of the backlight driving sequence of the backlight module operating in the second display mode according to an embodiment of FIG. 5;

FIG. 7B is a schematic diagram of the emission spectrum of the first and second color lights according to an embodiment of FIG. 5 .

Among them, reference signs:

100: display

110: display panel

120, 520: backlight module

122a, 522a: first light source

122b, 522b: second light source

124: light guide plate

126: filter unit

130: Backlight control circuit

140: display drive circuit

524: Light conversion layer

B: blue

BL: Backlight

CL1: first shade

CL2: second color light

CL3: third color light

DATA_dp, DATA_RGB: picture data

DATA_R: Red screen data

DATA_G: green screen data

DATA_B: blue screen data

FP: picture period

G: green

LPF: filter characteristic curve

S_mode: mode command

R: red

W: White

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

An embodiment of the present invention proposes a display that can provide two display modes with different color saturation for viewers to choose from, so that viewers can choose an appropriate display mode according to their viewing needs, so as to take into account the light emission of the display efficiency and display quality. In order to make the content of the present invention more comprehensible, the following specific embodiments are taken as examples in which the present invention can indeed be implemented. In addition, wherever possible, elements/components/steps with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts.

FIG. 1 is a schematic diagram of a display according to an embodiment of the present invention. Referring to FIG. 1 , the display 100 includes a display panel 110 , a backlight module 120 , a backlight control circuit 130 and a display driving circuit 140 .

In this embodiment, the display panel 110 is, for example, two correspondingly disposed substrates (not shown), a non-self-luminous display medium layer (not shown), and a color filter layer (not shown). The non-self-luminous display medium layer (not shown) is disposed between two corresponding substrates (not shown), and the color filter layer (not shown) is disposed on any one of the two corresponding substrates. Wherein, the color filter layer (not shown) includes at least red, green, blue, or other suitable colors, and the non-self-luminous display medium layer (not shown) includes a liquid crystal layer, an electrowetting layer, an electrophoretic layer, or other suitable materials. Moreover, in order to be able to actively control the non-self-luminous display medium layer, the display panel 110 further includes an active element (not shown) disposed on any one of the two corresponding substrates, wherein the active element and the color filter layer can be selectively Simultaneously on the same substrate or on different substrates. The present invention takes a liquid crystal display (LCD) panel in which the display panel 110 includes a color filter layer (color filter layer) as an embodiment, but is not limited thereto. The display panel 110 is controlled by the display driving circuit 140 and displays corresponding frames according to the frame data DATA_dp received from the display driving circuit 140 . For example, the display driving circuit 140 may include a timing controller (not shown), a gate driver (not shown), and a source driver (not shown). The timing controller can be used to control the operation timing of the gate driver and the source driver and provide the frame data DATA_dp to the source driver. The gate driver is controlled by the timing controller to sequentially turn on each row of pixels on the display panel 110 at a specific timing. The source driver cooperates with the turn-on timing of each row of pixels on the display panel 110 to provide a corresponding pixel voltage to drive the display panel 110 , so that the display panel 110 displays a picture corresponding to the picture data DATA_dp. Here, the time required for the display panel 110 to display a complete frame according to the frame data DATA_dp can be defined as a frame period.

The backlight module 120 is, for example, a direct-lit backlight module or an edge-lit backlight module disposed on the lower side of the display panel 110 (relative to the display surface of the display panel). The backlight module 120 is controlled by the backlight control circuit 130 to provide the backlight BL required by the display panel 110 . Here, although the display driving circuit 140 and the backlight control circuit 130 are shown as two independent circuits in FIG. 1 , in practical applications, they can be integrated into the same driving chip for implementation, so the present invention is not limited thereto.

In detail, the backlight module 120 includes a first light source 122a for providing the first color light CL1 and a second light source 122b for providing the second color light CL2. Wherein, the backlight control circuit 130 can receive a mode command CMD sent by the user/viewer through a control interface (not shown), and use different driving means to control the first light source 122a according to the received mode command CMD and the lighting sequence of the second light source 122b, wherein the backlight control circuit 130 outputs the first light source control signal BL_122a to control the first light source 122a, and the backlight control circuit 130 outputs the second light source control signal BL_122b to control the second light source 122b, so that The display panel 110 can present image frames with different color saturations based on the needs of viewers.

More specifically, the backlight module 120 is controlled by the backlight control circuit 130 to operate in one of the first display mode and the second display mode. When the backlight module 120 operates in the first display mode, the backlight control circuit 120 controls the first light source 122a to provide the first color light CL1 as the backlight BL during each frame period. When the backlight module 120 operates in the second display mode, the backlight control circuit 130 will control the first light source 122a and the second light source 122b to provide the first At least one of the colored light CL1 and the second colored light CL2 serves as a backlight BL.

Herein, the first sub-picture period can be defined as the time required for the display panel 110 to display the first color part in a complete picture according to the first color picture data in the picture data DATA_dp, and the second sub-picture period It can be defined as the time required for the display panel 110 to display the second color part in a complete picture according to the second color picture data in the picture data DATA_dp, and the combination of the first color picture data and the second color picture data must be Full color screen data. For example, if the first color picture data is red and blue picture data at the same time, the second color picture data is green picture data; if the first color picture data is red picture data, the second color picture data is green and blue picture data. Blue screen data. In other words, the display panel 110 receives the first color picture data during the first sub-picture period of the picture period, and receives the second color picture data during the second sub-picture period of the picture period.

In this embodiment, the first color light CL1 is white light, and the second color light CL2 is green light, cyan light or red light. The color corresponding to the first color picture data is substantially the same as the color of the second color light CL2, in other words, the color corresponding to the first color picture data and the color of the second color light CL2 overlap in their respective spectrums, And the colors corresponding to the first and second color picture data are different from each other. For example, if the second color light CL2 is green light or cyan light, the first color picture data may be, for example, green picture data, and the second color picture data may be, for example, a combination of red picture data and blue picture data.

In another embodiment, the first color light CL1 is white light, and the second color light CL2 is green light. The color corresponding to the second color picture data is the same as the color of the second color light CL2, and the colors corresponding to the first and second color picture data are different from each other. For example, if the second color light CL2 is green light, the second color picture data may be, for example, green picture data, and the first color picture data may be, for example, a combination of red picture data and blue picture data. If the second color light CL2 is red light, the second color frame data may be, for example, red frame data, and the first color frame data may be, for example, a combination of green frame data and blue frame data.

In other words, in the embodiment of the present invention, the color corresponding to one of the first color frame data and the second color frame data received by the display panel 110 is the same as the color of the second color light CL2, and the first color frame data is the same as the second color frame data. The colors corresponding to the two-color picture data are different from each other.

Based on the above picture data DATA_dp and the color and timing matching of the first light source 122a and the second light source 122b, the display 100 of the embodiment of the present invention can provide white light with high luminous efficiency as the backlight source BL in the first display mode to reduce the The power consumption of the display 100, and in the second display mode, the color sequential method (colorsequential) is used to provide color light with better color rendering (for example: red light or green light) during the display period of a specific color picture as The backlight BL is used to improve the color saturation of the overall display 100 . In addition, based on the above-mentioned driving characteristics, the color filter layer of the display panel 110 can be realized by using a material with a relatively high transmittance (for example, a color filter layer material generally used for about NTSC72%, wherein the The color filter layer material can be, for example, PR254/PR177/PG58/PY138/PB15:6 and other pigment (pigment) materials, or v-dye and other dye (dye) materials, the present invention is not limited thereto), so that the display 100 In the second display mode with high color saturation, it can also have the characteristic of high transmittance (compared to the color filter layer with high color saturation).

The first color light CL1 and the second color light CL2 described here are not limited to monochromatic light, and they can also be mixed color light with wavelength components of other colors. For example, if the second light source 122b is a green light source realized by a blue LED chip and a green fluorescent material, although the second color light CL2 emitted by it is called green light in the embodiment of the present invention, it is actually It still contains the wavelength component of blue light, so it can also be called blue-green light, which will be described here first.

The specific structure of the backlight module 120 and the driving configuration, driving timing and emission spectrum of the backlight module 120 in different display modes are further illustrated below with the embodiments of FIG. 2 to FIG. 4D . In this embodiment, for ease of description, the first light source 122a is an example of a white light source (for example, it can be realized by a blue LED chip and a yellow fluorescent material), and the first color light CL1 is, for example, white light (W). The second light source 122 b is an example of a green light source (for example, it can be realized by a blue LED chip and a green fluorescent material), and the second color light CL2 is, for example, green light (G). But the present invention is not limited thereto.

FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the invention. Please refer to FIG. 2 , the backlight module 120 of this embodiment is illustrated by taking a side-light structure as an example. In addition to the first light source 122a and the second light source 122b, it can further include a light guide plate (or called is the light guiding element) 124. In addition, the backlight module 120 of this embodiment can also selectively arrange a filter unit 126 between the second light source 122b and the light guide plate 124 according to the needs of the designer (the difference caused by whether the filter unit 126 is set will be in (further described in subsequent embodiments), wherein the filter unit 126 can be used to filter out specific wavelength components in the second color light CL2, so as to make the color of the second color light CL2 more pure.

In detail, when the backlight module 120 operates in the first display mode (referred to as “low NTSC mode” herein), the driving configuration, driving timing and emission spectrum of the backlight module 120 are shown in FIGS. 3A-3C . Wherein, FIG. 3A is a schematic diagram of the backlight module operating in the first display mode according to an embodiment of FIG. 2 . FIG. 3B is a schematic diagram of a backlight driving sequence according to an embodiment of FIG. 3A . FIG. 3C is a schematic diagram of the emission spectrum of the first color light according to an embodiment of FIG. 3A .

Please refer to FIG. 3A to FIG. 3C at the same time. When the backlight module 120 operates in the low NTSC mode, the first light source 122a will be turned on and the second light source 122b will be turned off, so that the backlight module 120 provides the first color light CL1 (in this paper In the embodiment, for example, white light (W) is used as the backlight BL of the display panel 110 .

Taking the driving sequence of FIG. 3B as an example, when the display panel 110 receives the picture data DATA_RGB corresponding to one display picture within one picture period FP, the first light source 122a will respond to the enabled first light source control signal BL_122a (herein is high level) and is turned on for a period of time in the picture period FP (the length of this period can be designed by the designer), and the period when the first light source 122a is turned on is when the first light source control signal BL_122a is at a high level During the flat period, the second light source 122b is continuously turned off in response to the disabled second light source control signal BL_122b (low level here). Wherein, in the low NTSC mode, the emission spectrum of the backlight BL can be as shown in FIG. 3C .

In this embodiment, since the backlight module 120 operating in the low NTSC mode provides the backlight with a white light source with high luminous efficiency, it only needs to supply lower driving power to maintain the luminous brightness of the backlight module 120, so that The overall power consumption of the display 100 is reduced. Wherein, the color saturation of the display 100 in the low NTSC mode is, for example, about NTSC 72%.

On the other hand, when the backlight module 120 is operating in the second display mode (referred to as “high NTSC mode” herein), the driving configuration, driving timing and emission spectrum of the backlight module 120 are shown in FIGS. 4A˜4D . Wherein, FIG. 4A is a schematic diagram of the backlight module operating in the second display mode according to an embodiment of FIG. 2 . FIG. 4B is a schematic diagram of a backlight driving sequence according to an embodiment of FIG. 4A . FIG. 4C is a schematic diagram of the emission spectrum of the second color light according to an embodiment of FIG. 4A . FIG. 4D is a schematic diagram of the emission spectrum of the second color light according to another embodiment of FIG. 4A . In addition, the low NTSC mode and the high NTSC mode here are relative modes, that is, the low NTSC mode has lower color saturation but higher transmittance than the high NTSC mode.

Please refer to FIGS. 4A and 4B at the same time. When the backlight module 120 operates in the high NTSC mode, the first light source 122a and the second light source 122b are controlled by the backlight control circuit 130 to be turned on according to different driving timings, so that the backlight module 120 provides one of the second color light CL2 (for example, green light (G) in this embodiment) and the first color light CL1 as the backlight BL of the display panel 110 during different sub-frame periods in the frame period.

Taking the driving sequence of FIG. 4B as an example, when the display panel 110 receives the green picture data DATA_G corresponding to the green portion of a display picture in the first sub-picture period SFP1 of the picture period FP, the first light source 122a and the second light source 122b Responding to the enabled first light source control signal BL_122a and the second light source control signal BL_122b respectively, they are simultaneously lit for a period of time in the first sub-picture period SFP1 (the length of this period can also be designed by the designer), so that When the display panel 110 displays a green image, white light (W) and green light (G) are simultaneously provided as the backlight BL. Next, when the display panel 110 receives the picture data DATA_RB corresponding to the red and blue parts of a display picture during the second sub-picture period SFP2 in the picture period FP, the first light source 122a will respond to the enabled first light source The control signal BL_122a is independently turned on for a period of time in the second sub-picture period SFP2. At this time, the second light source 122b is turned off in response to the disabled second light source control signal BL_122b, so that when the display panel 110 displays red and blue pictures , alone provide white light (W) as the backlight BL.

Based on this, since the backlight module 120 provides high color rendering green light (G) as the backlight BL when the display panel 110 displays a green image, the color saturation of the display 100 is improved. Wherein, the color saturation of the display 100 in the high NTSC mode is, for example, about NTSC93%.

In the embodiment of high NTSC mode, the emission spectrum of the first color light CL1 (or the backlight source BL in SFP2 during the second sub-picture period) is the same as that of the embodiment in Fig. 3C, while the second color light CL2 (or the first sub-picture period The emission spectrum of the backlight source BL) in the period SFP1 may be as shown in FIG. 4C or FIG. 4D according to the configuration of the filter unit 126 . Wherein, the thick solid line in FIG. 4C and FIG. 4D represent the emission spectra of the unfiltered and filtered second color light CL2 respectively, and the thin solid line in FIG. 4C represents the filter characteristic curve LPF of the filter unit 126 . In this embodiment, the second color light CL2 has at least a first characteristic peak CP1 and a second characteristic peak CP2, wherein the first characteristic peak CP1 is located in the wavelength range of blue light (for example, about 400-480 nanometers), and the second characteristic peak CP2 Then it is located in the wavelength range of green light (for example, about 480-620 nanometers).

As shown in FIG. 4C , under the framework of the backlight module 120 without the filtering unit 126, the spectral intensity of the first characteristic peak CP1 is greater than the spectral intensity of the second characteristic peak CP2 by about 2.2 times or more (that is, the first characteristic peak CP1 The spectral intensity divided by the spectral intensity of the second characteristic peak CP2 is approximately greater than 2.2). In other words, the color purity of the second color light CL2 emitted by the second light source 122b is low without filtering (because the blue light component is greater than the green light component), so the color display of the display screen may be limited to a certain extent. (However, compared to simply using white light as a backlight, it can still provide higher color saturation).

Therefore, in an exemplary embodiment of the present invention, the backlight module 120 can filter the energy of the second color light CL2 in the blue wavelength range by setting the filter unit 126, so as to make the color purity of the filtered second color light CL2 Can be further improved. Wherein, the wavelength range filtered by the filter unit 126 may be, for example, about 420-500 nm overlapping with the blue light wavelength range, and the maximum filter spectral intensity divided by the minimum filter spectral intensity of the filter unit 126 may be less than 0.7, for example. More specifically, in practical applications, the filtering unit 126 can be, for example, a film made of a small molecule dye with a narrow half-maximum width of the transmission spectrum, wherein the film can be made of polyethylene terephthalate ( Polyethyleneterephthalate, PET) PET film made by injection molding. In addition, the thin film can also be modulated into a photoresist and directly formed on the target substrate by spin coating, but the present invention is not limited thereto.

The emission spectrum of the filtered second color light CL2 can be shown in FIG. 4D , wherein the spectral intensity of the first characteristic peak CP1 of the filtered second color light CL2 divided by the spectral intensity of the second characteristic peak CP2 is less than 0.62. In other words, the color purity of the second color light CL2 emitted by the second light source 122b through the filter unit 126 is higher than that of the unfiltered second color light CL2, that is, the filtered second color light CL2 is within the wavelength range of green light (for example, about 480~ 620 nanometers) has a relatively high content, so the color saturation of the display 100 can be further improved.

Herein, although in the embodiment of FIG. 4B , the backlight driving method of simultaneously turning on the first light source 122 a and the second light source 122 b in the first sub-frame period SFP1 is taken as an example. But in another exemplary embodiment, the backlight control circuit 130 can also turn on the second light source 122b separately in the first sub-frame period SFP1, so as to provide only green light (G) as the backlight in the first sub-frame period SFP1 The source BL can achieve a better high NTSC mode, so the present invention is not limited to the driving sequence shown in FIG. 4B. In other words, as long as the "backlight module 120 is operating in the second display mode (high NTSC mode), at least the second light source 122b is turned on in the first sub-picture period SFP to provide at least the second color light CL2 as a backlight BL, and the first light source 122a being turned on independently in the second sub-picture period SFP2 to provide the first color light CL1 as the driving method of the backlight BL" are within the protection scope of the present invention.

5 to 7B illustrate the specific structure, driving timing and emission spectrum of the backlight module 520 according to another embodiment of the present invention. Please refer to FIG. 5 first. The control method and application environment of the backlight module 520 in this embodiment are generally similar to those of the backlight module 120 in the embodiment in FIG. 1 . The difference between the two is that, in addition to the first light source 522a and the second light source 522b, the backlight module 520 of this embodiment also includes a light conversion layer 524 . Wherein, the colors of the first light source 522 a , the second light source 522 b and the light conversion layer 524 in this embodiment are in one-to-one correspondence with the three primary colors. For example, if the first light source 522a is a red light source and the second light source 522b is a blue light source, the light conversion layer 524 can be implemented with a green fluorescent material. Also, if the first light source 522a is a green light source and the second light source 522b is a red light source, the light conversion layer 524 can be realized by using blue fluorescent materials, and so on.

In this embodiment, for ease of description, the first light source 522a is an example of a blue light source (for example, it can be realized by a blue LED chip), and the first color light CL1 is, for example, blue light (B). The second light source 522b is an example of a red light source (for example, it can be realized by a red LED chip), and the second color light CL2 is, for example, red light (R). The light conversion layer 524 is an example of a green light conversion layer (for example, it can be realized by a green fluorescent material, and the green fluorescent material can be realized by using, for example, a green nitride (greennitride) phosphor, and the wavelength corresponding to its characteristic peak is, for example, 529/ 531/535nm; or, it can also be realized by using common phosphors such as greensulfide phosphors. As long as it is a phosphor that emits light in the green band, it can be used in this embodiment of the invention). When the first color light CL1 and the second color light CL2 are simultaneously incident on the light conversion layer 524 , the third color light CL3 excited by the light conversion layer 524 is, for example, white light (W). But the present invention is not limited thereto.

In detail, when the backlight module 520 is operating in the first display mode (low NTSC mode), the driving timing and emission spectrum of the backlight module 520 are shown in FIGS. 6A and 6B . 6A is a schematic diagram of the backlight driving sequence of the backlight module operating in the first display mode according to an embodiment of FIG. 5 . FIG. 6B is a schematic diagram of the emission spectrum of the third color light according to an embodiment of FIG. 5 .

Please refer to FIG. 5, FIG. 6A and FIG. 6B at the same time. When the backlight module 520 operates in the low NTSC mode, the first light source 522a and the second light source 522b are respectively controlled by the first backlight provided by the backlight control circuit (such as 130). The control signal BL_522a and the second backlight control signal BL_522b are turned on at the same time, so that the light conversion layer 524 simultaneously absorbs the first color light CL1 (blue light (B) in this embodiment) and the second color light CL2 (in this embodiment Red light (R) in the middle) to excite the third color light CL3 (approximately white light (W) in this embodiment), so that the backlight module 520 provides the third color light CL3 as the backlight of the display panel (such as 110 ) Source BL.

Taking the driving sequence of FIG. 6A as an example, when the display panel receives the picture data DATA_RGB corresponding to one display picture within one picture period FP, the first light source 522a and the second light source 522b will respectively respond to the enabled first backlight control The signal BL_522a and the second backlight control signal BL_522b are simultaneously turned on for a period within the frame period FP. Wherein, in the low NTSC mode, the emission spectrum of the backlight BL can be as shown in FIG. 6B .

On the other hand, when the backlight module 520 is operating in the second display mode (high NTSC mode), the driving timing and emission spectrum of the backlight module 520 are shown in FIGS. 7A and 7B . Wherein, FIG. 7A is a schematic diagram of the backlight driving sequence of the backlight module operating in the second display mode according to an embodiment of FIG. 5 . FIG. 7B is a schematic diagram of the emission spectrum of the first and second color lights according to an embodiment of FIG. 5 .

Please refer to FIG. 5, FIG. 7A and FIG. 7B at the same time. When the backlight module 520 operates in the high NTSC mode, the first light source 522a and the second light source 522b are controlled by the backlight control circuit and are turned on according to different driving timings, thereby The backlight module 520 provides at least one of the first color light CL1 , the second color light CL2 and the third color light CL3 as the backlight BL through the light conversion layer 524 during different sub-frame periods in the frame period.

Taking the driving sequence of FIG. 7A as an example, when the display panel receives the blue picture data DATA_B corresponding to the blue part of a display picture in the first sub-picture period SFP1 of the picture period FP, the first light source 522a will respond to The first backlight control signal BL_522a can be turned on for a period of time in the first sub-picture period SFP1 (the length of this period can also be designed by the designer), so as to provide blue light when the display panel displays a blue picture (B ) as the backlight BL (the second light source 522b is turned off in response to the disabled second backlight control signal BL_522b at this time). Next, when the display panel receives the red picture data DATA_R corresponding to the red portion of a display picture in the second sub-picture period SFP2 of the picture period FP, the first backlight control signal BL_522a is switched to disable and the second backlight control signal BL_522b is switched to enable, so that the second light source 522b responds to the enabled second backlight control signal BL_522b and is independently lit for a period of time in the second sub-picture period SFP2 (the length of this period can also be designed by the designer himself) , so as to provide red light (R) as a backlight BL when the display panel displays a red image (the first light source 522 a is turned off in response to the disabled first backlight control signal BL_522 a at this time). Afterwards, when the display panel receives the green picture data DATA_G corresponding to the green part of a display picture in the third sub-picture period SFP3 of the picture period FP, the first light source 522a and the second light source 522b will respectively respond to enabling The first backlight control signal BL_522a and the second backlight control signal BL_522b are simultaneously turned on for a period of time in the third sub-picture period SFP3 (the length of this period can also be designed by the designer) to display a green picture on the display panel When providing white light (W) as a backlight BL. Wherein, in the high NTSC mode, the emission spectrum of the first color light CL1 and the second color light CL2 can be shown in FIG. 7B , and the emission spectrum of the third color light CL3 can be shown in FIG. 6B .

In order to achieve the function of increasing color saturation in high NTSC mode, the colors corresponding to the picture data received by the display panel during each sub-picture period SFP1, SFP2 and SFP3 are the same as the first color light CL1, the second color light CL2 and the third color light There will be a specific correspondence between the colors of CL3. More clearly, the color corresponding to the first color picture data received by the display panel during the first sub-picture period (in this embodiment, the blue picture data is taken as an example) will be substantially the same as the color of the first color light CL1. same. The color corresponding to the second color picture data received by the display panel during the second sub-picture period (the red picture data is taken as an example in this embodiment) is substantially the same as the color of the second color light CL2 . The color corresponding to the third color picture data received by the display panel during the third sub-picture period (the green picture data is taken as an example in this embodiment) is different from the colors of the first color light CL1 and the second color light CL2 .

With the above-mentioned driving method, the backlight module 520 can realize the characteristics and functions similar to those described in the embodiment of FIG. 1 to FIG. 4D , so the same or repeated ones will not be repeated here.

In another exemplary embodiment, when the display panel receives the green picture data DATA_G corresponding to the green part of a display picture in the third sub-picture period SFP3 of the picture period FP, the second sub-picture period can be individually lighted during this picture period. A light source 522a for better green color rendering. In other words, in this exemplary embodiment, according to FIG. 7A , the first light source 522a will be turned on for a period of time in the first sub-picture period SFP1 and SFP3 respectively, and the second light source 522b will be turned on during the second sub-picture period. SFP2 is lit for a period of time alone. That is, the first light source 522a and the second light source 522b are alternately turned on in different sub-picture periods.

The backlight module 520 driven by the above driving sequence can be applied to a general flat panel display or a stereoscopic display. No matter what type of display it is used in, it can provide white light with high luminous efficiency as a backlight in low NTSC mode to save power consumption, and provide corresponding color light in accordance with the color sequence of picture data in high NTSC mode As a backlight supply mechanism for improving the color saturation of the display, the present invention does not limit the type of display to which the backlight module is applied.

To sum up, the embodiment of the present invention provides a display that can provide two display modes with different color saturation for viewers to choose from. In a display mode with low color saturation, the backlight module can provide white light with high luminous efficiency as a backlight source to save power consumption of the display. In the display mode with high color saturation, the backlight module can provide corresponding color light as a backlight according to the color sequence of the picture data received by the display panel, thereby improving the color saturation of the display. Based on this, the display according to the embodiment of the present invention can use an appropriate display mode to display images according to the viewer's viewing needs, so as to balance the luminous efficiency and display quality of the display.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (11)

1. a display, comprising:

One display panel;

One backlight module, is configured at the downside of this display panel, and in order to provide a backlight to give this display panel, wherein this backlight module comprises one first light source providing one first coloured light, and in order to provide a secondary light source of one second coloured light;

One backlight control circuit, couples this backlight module, control through setting this backlight module operate in one first display mode and one second display mode one of them, it is characterized in that,

Wherein, when this backlight module operates in this first display mode, this backlight control circuit controls this first light source provides this first coloured light as this backlight during a picture, and when this backlight module operates in this second display mode, this backlight control circuit control this first with this secondary light source sequentially during this picture in one first sub picture period and one second sub picture period provide this first with this second coloured light at least one of them as this backlight;

When this backlight module operates in this second display mode, at least this secondary light source is lit in this first sub picture period, at least to provide this second coloured light as this backlight, and this first light source is lit separately in this second sub picture period, to provide this first coloured light as this backlight.

2. display according to claim 1, it is characterized in that, when this backlight module operates in this second display mode, this first light source and this secondary light source are lit in this first sub picture period simultaneously, to provide this first coloured light and this second coloured light as this backlight.

3. display according to claim 1, it is characterized in that, when this backlight module operates in this second display mode, this display panel receives one first colored picture data in this first sub picture period, and receives one second colored picture data in this second sub picture period.

4. display according to claim 3, it is characterized in that, this first coloured light is white light, this second coloured light is green glow or ruddiness, this color corresponding to the second colored picture data is identical with the color of this second coloured light, and this first and this color corresponding to the second colored picture data different from each other.

5. display according to claim 1, it is characterized in that, this second coloured light at least has a fisrt feature peak value and a second feature peak value, and this fisrt feature peak value is positioned at a first wave length scope and this second feature peak value is positioned at a second wave length scope; This first wave length scope is 400 ~ 480 nanometers, and this second wave length scope is 480 ~ 620 nanometers.

6. display according to claim 5, is characterized in that, the spectrum intensity of this fisrt feature peak value is greater than 2.2 divided by the spectrum intensity of this second feature peak value.

7. display according to claim 5, is characterized in that, this backlight module also comprises:

One filter unit, in order to the energy of this second coloured light of filtering in a wavelength range, wherein this wavelength range and this first wave length scope overlapped.

8. display according to claim 7, is characterized in that, this wavelength range is 420 ~ 500 nanometers, and the maximum filtered spectrum intensity of this filter unit is less than 0.7 divided by its minimum filtered spectrum intensity.

9. display according to claim 7, is characterized in that, the spectrum intensity of this second feature peak value is less than 0.62 divided by the spectrum intensity of this fisrt feature peak value.

10. display according to claim 1, it is characterized in that, also comprise a light conversion layer, when this backlight module operates in this second display mode, first with this secondary light source through control sequentially during this picture in this first sub picture period, this second sub picture period and one the 3rd sub picture period by this light conversion layer provide this first, this second and one the 3rd coloured light at least one of them as this backlight.

11. displays according to claim 10, it is characterized in that, this first light source is lit separately in this first sub picture period, to be provided this first coloured light as this backlight by this light conversion layer, this secondary light source is lit separately in this second sub picture period, to be provided this second coloured light as this backlight by this light conversion layer, and this first light source and this secondary light source are lit, to be provided the 3rd coloured light as this backlight by this light conversion layer in the 3rd sub picture period simultaneously.