TWI503812B - Display - Google Patents

Description

monitor

This invention relates to a display, and more particularly to a display that can switch color saturation.

Liquid crystal displays (LCDs) with superior image quality, good space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of displays. Since the liquid crystal display panel does not have self-luminous characteristics, a backlight module must be placed under the liquid crystal display panel to provide a light source required for the liquid crystal display panel. The conventional backlight module can be roughly divided into two types, one is a backlight module composed of cold cathode fluorescent lamps (CCFL), and the other is a light emitting diode (LED). The backlight module is composed. Among them, since the light-emitting diode backlight module can enhance the color gamut of the liquid crystal display, most manufacturers today replace the cold cathode tube backlight module with a light-emitting diode backlight module.

For the color performance of a liquid crystal display, the color saturation of the display is usually measured by a standard set by the National Television System Committee (NTSC). On the other hand, there is a pass in the field. Frequently, when adjusting the red saturation, green saturation, and blue saturation of a liquid crystal display, the sRGB or EBU specification is usually used as a reference for color adjustment.

In general, in order to improve the color saturation of the display, there are usually two different methods under the current technology: (1) using a color filter layer with high color saturation in the display panel; (2) using high color rendering. The lighting module is used as a backlight. However, both of these practices have some drawbacks.

Specifically, if the method (1) is adopted, since the transmittance of the color filter layer having high color saturation is relatively low, it is necessary to maintain the luminance of the display by increasing the driving power of the light-emitting module. If the method (2) is adopted, since it is necessary to incorporate a higher concentration of phosphor powder to achieve high color rendering properties, the luminous efficiency of the light-emitting module is relatively poor, and the process tolerance is also low. In other words, regardless of the practice (1) or practice (2), if you want to increase the color saturation of the display, it is bound to face the problem of increased power consumption.

In addition, in some application scenarios (such as when processing documents), high color saturation screen rendering is not necessary. Moreover, watching the 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 characteristics of the color saturation and power consumption of the display are inevitably balanced by the current technology.

The present invention provides a display that provides at least two display modes having different color saturations for use by a viewer.

The display of the present invention includes a display panel, a backlight module, and a backlight control circuit. The backlight module is disposed on a lower side of the display panel for providing a backlight 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 is operated in the first display mode, the backlight control circuit controls the first light source to provide the first color light as a backlight during the screen, and the backlight control circuit controls when the backlight module operates in the second display mode. The first and second light sources provide 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 in the picture period.

Based on the above, the embodiment of the present invention provides a display that can provide two display modes with different color saturations for the viewer to select for use. In the low color saturation display mode, the backlight module can provide white light with high luminous efficiency as a backlight to save power consumption of the display. In the high color saturation display mode, 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. Therefore, the display of the embodiment of the present invention can display the screen by using an appropriate display mode according to the viewing requirements of the viewer, thereby achieving both the luminous efficiency and the display quality of the display.

The above described features and advantages of the invention will be apparent from the following description.

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 color light

CL2‧‧‧Second shade

CL3‧‧‧ third color light

DATA_dp, DATA_RGB‧‧‧ screen data

DATA_R‧‧‧Red picture material

DATA_G‧‧‧Green picture material

DATA_B‧‧‧Blue screen data

FP‧‧‧ screen period

G‧‧‧Green

LPF‧‧‧Filter characteristic curve

S_mode‧‧‧ mode command

R‧‧‧Red

W‧‧‧White

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 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 backlight driving timing in accordance with an embodiment of FIG. 3A.

3C is a schematic diagram of an emission spectrum of a first color light in accordance with an embodiment of FIG. 3A.

4A is a schematic diagram of a backlight module operating in a second display mode in accordance with an embodiment of FIG. 2. FIG.

4B is a schematic diagram of backlight driving timing in accordance with an embodiment of FIG. 4A.

4C is a schematic diagram of an emission spectrum of a second color light in accordance with an embodiment of FIG. 4A.

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

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

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

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

7A is a diagram of a backlight module operating in a second display mode according to an embodiment of FIG. Schematic diagram of the backlight driving timing under the equation.

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

The embodiment of the invention provides a display, which can provide two display modes with different color saturations for the viewer to select, so that the viewer can select an appropriate display mode according to the viewing requirements, thereby achieving the luminous efficiency of the display. And display quality. In order to make the disclosure of the present disclosure easier to understand, the following specific embodiments are examples of the disclosure that can be implemented. In addition, wherever possible, the same elements, components, and steps in the drawings and embodiments are used to represent the same or similar components.

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, a corresponding substrate (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 correspondingly disposed substrates (not shown), and the color filter layer (not shown) is disposed on any of the two correspondingly disposed substrates. 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. Furthermore, in order to be able to actively control the non- The self-luminous display medium layer, the display panel 110 further includes an active component (not shown) disposed on any of the corresponding substrates, wherein the active component and the color filter layer are selectively simultaneously on the same substrate or different. On the substrate. The present invention is based on the liquid crystal display (LCD) panel of the display panel 110 including a color filter layer, but is not limited thereto. The display panel 110 is controlled by the display driving circuit 140, and displays a corresponding picture in accordance with the picture material DATA_dp received from the display driving circuit 140. For example, the display driving circuit 140 can include, for example, 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 picture data DATA_dp to the source driver. The gate driver is controlled by the timing controller to sequentially turn on each column of pixels on the display panel 110 in a particular timing sequence. The source driver cooperates with the on timing of each column of pixels on the display panel 110 to provide a corresponding pixel voltage to drive the display panel 110, thereby causing the display panel 110 to display a screen corresponding to the picture material DATA_dp. Here, the time required for the display panel 110 to display a complete picture according to the picture material DATA_dp may be defined as one frame period.

The backlight module 120 is, for example, a direct-lit backlight module or a side-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 a backlight BL required by the display panel 110. Here, the display driving circuit 140 and the backlight control circuit 130 are shown as two independent circuits in FIG. In the application, the two can be integrated into the same driving chip, and 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. The backlight control circuit 130 can receive a mode command CMD issued by the user/viewer through the 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 timing 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, thereby The display panel 110 can present image images having different color saturations based on the needs of the viewer.

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 is operated 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 picture. When the backlight module 120 is operated in the second display mode, the backlight control circuit 130 controls the first light source 122a and the second light source 122b to sequentially provide the first sub-picture period and the second sub-picture period during each picture period. At least one of the primary color CL1 and the second color light CL2 serves as the backlight BL.

Here, the first sub-picture period may be defined as a time required for the display panel 110 to display a first color portion in a complete picture according to the first color picture material in the picture material DATA_dp, and the second sub-picture period Can be defined as explicit The display panel 110 displays the time required for the second color portion of a complete picture according to the second color picture data in the picture data DATA_dp, and the first color picture data and the second color picture data must be combined into a full color picture data. . For example, if the first color picture data is both red and blue picture data, 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 material. In other words, the display panel 110 receives the first color picture material during the first sub-picture period of the picture period and receives the second color picture material during the second sub-picture period of the picture period.

In the present 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 material 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 the respective spectrums. And the colors corresponding to the first and second color picture materials are different from each other. For example, if the second color light CL2 is green or cyan light, the first color picture material may be, for example, green picture material, and the second color picture material may be, for example, a composition of red picture material and blue picture material.

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 material is the same as the color of the second color light CL2, and the colors corresponding to the first and second color picture materials are different from each other. For example, if the second color light CL2 is green light, the second color picture material may be, for example, a green picture material, and the first color picture material may be, for example, a red picture material. Composition of materials and blue screen materials. If the second color light CL2 is red light, the second color picture data may be, for example, red picture material, and the first color picture data may be, for example, a composition of green picture data and blue picture material.

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

The display 100 of the embodiment of the present invention can realize white light that provides high luminous efficiency in the first display mode as the backlight BL to reduce the color and timing of the image data DATA_dp and the first light source 122a and the second light source 122b. The power consumption of the display 100, and in the second display mode, the color sequential driving method is used to provide color-changing color light (for example, red light or green light) during the display period of the specific color picture. The backlight BL is used to increase the color saturation of the overall display 100. In addition, based on the driving characteristics described above, the color filter layer of the display panel 110 can be implemented by using a material having a higher transmittance (for example, a color filter layer material generally used for about NTSC 72%). The color filter layer material may be, for example, a pigment material such as PR254/PR177/PG58/PY138/PB15:6, or a dye material such as v-dye, which is not limited thereto, so that the display 100 It can also have high transmittance characteristics in the second display mode of high color saturation (compared to a color filter layer using high color saturation).

The first color light CL1 and the second color light CL2 described herein are not limited to only Monochromatic light, which can also be a 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 with a green fluorescent material, the second color light CL2 emitted by the second light source 122b is called green light in the embodiment of the present invention, but the actual It still contains the wavelength component of blue light, so it can also be called blue-green light.

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

2 is a schematic diagram of a backlight module according to an embodiment of the invention. Referring to FIG. 2 , the backlight module 120 of the present embodiment is illustrated by using a lateral light-input architecture. In addition to the first light source 122 a and the second light source 122 b , the backlight module 120 may further include a light guide plate (or It is called a light guiding element 124. In addition, the backlight module 120 of the present embodiment can also selectively provide a filtering 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 the filter unit 126 being set or not) Further illustrated in the subsequent embodiments, wherein the filtering unit 126 can be used to filter out specific wavelength components in the second color light CL2 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 herein as “low NTSC mode”), the driving configuration, driving timing, and illuminating spectrum of the backlight module 120 are as shown in FIGS. 3A-3C. . 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 backlight driving timing in accordance with an embodiment of FIG. 3A. 3C is a schematic diagram of an emission spectrum of a first color light in accordance with an embodiment of FIG. 3A.

Referring to FIG. 3A to FIG. 3C simultaneously, when the backlight module 120 is operated in the low NTSC mode, the first light source 122a is illuminated and the second light source 122b is turned off, so that the backlight module 120 provides the first color light CL1 ( In the present 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 in one picture period FP, the first light source 122a is reflected by the enabled first light source control signal BL_122a (here) It is a high level) and is illuminated for a period of time during the picture period FP (the length of the period can be designed by the designer), wherein the first light source control signal BL_122a is located at the high level during the period in which the first light source 122a is illuminated. During the bit period, the second light source 122b is continuously turned off in response to the disabled second light source control signal BL_122b (here, low level). Wherein, in the low NTSC mode, the light 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 a backlight with a white light source having high luminous efficiency, the luminance of the backlight module 120 can be maintained only by supplying a lower driving power. Thereby making the display The overall power consumption of 100 is reduced. 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 operates in the second display mode (referred to herein as "high NTSC mode"), the driving configuration, driving timing, and illuminating spectrum of the backlight module 120 are as shown in FIGS. 4A-4D. . 4A is a schematic diagram of the backlight module operating in the second display mode according to an embodiment of FIG. 2. 4B is a schematic diagram of backlight driving timing in accordance with an embodiment of FIG. 4A. 4C is a schematic diagram of an emission spectrum of a second color light in accordance with an embodiment of FIG. 4A. 4D is a schematic diagram of an emission spectrum of a 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 than the high NTSC mode but has higher transmittance.

4A and 4B, when the backlight module 120 is operated 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 illuminated according to different driving timings, thereby making the backlight The 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-pictures in the picture period. .

Taking the driving sequence of FIG. 4B as an example, when the display panel 110 receives the green screen material DATA_G corresponding to the green portion of one display screen during the first sub-picture period SFP1 in the picture period FP, the first light source 122a and the second light source 122b The first light source control signal BL_122a and the second light source control signal BL_122b, which are enabled, are respectively illuminated during the first sub-picture period SFP1 for a period of time. (The length of the period can also be designed by the designer) to provide white light (W) and green light (G) as the backlight BL when the display panel 110 displays a green screen. Next, when the display panel 110 receives the picture data DATA_RB corresponding to the red and blue portions of one display picture during the second sub-picture period SFP2 in the picture period FP, the first light source 122a is reflected by the enabled first light source. The control signal BL_122a is separately illuminated during the second sub-picture period SFP2, and the second light source 122b is turned off in response to the disabled second light source control signal BL_122b to display red and blue pictures on the display panel 110. When the white light (W) is separately provided as the backlight BL.

Therefore, since the backlight module 120 provides high color rendering green light (G) as the backlight BL when the display panel 110 displays a green screen, the color saturation of the display 100 is improved. Among them, the color saturation of the display 100 in the high NTSC mode is, for example, about NT% 93%.

In the embodiment of the high NTSC mode, the light emission spectrum of the first color light CL1 (or the backlight BL in the second sub-picture period SFP2) is the same as the foregoing embodiment of FIG. 3C, and the second color light CL2 (or the first sub-picture) The light emission spectrum of the backlight BL) during the period SFP1 may be as shown in FIG. 4C or FIG. 4D according to the configuration of the filtering unit 126. The thick solid line portions of FIG. 4C and FIG. 4D respectively represent the light-emitting spectrum of the unfiltered and filtered second color light CL2, and the thin solid line portion of FIG. 4C represents the filter characteristic curve LPF of the filtering 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 in the blue wavelength range (for example, about 400 to 480 nm), and the second characteristic peak is CP2 is located in the green wavelength range (for example, about 480~620 nm).

As shown in FIG. 4C, in the backlight module 120 structure in which the filtering unit 126 is not disposed, 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 (that is, the first characteristic peak CP1). The spectral intensity divided by the second characteristic peak CP2 has a spectral intensity greater than about 2.2). In other words, the second color light CL2 emitted by the second light source 122b has a lower color purity (because the blue light component is larger than the green light component) in an unfiltered condition, and thus may cause a certain degree of limitation on the color display of the display screen. (But it provides higher color saturation than white light alone as a backlight).

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 filtering unit 126, so that the color of the filtered second color light CL2 is filtered. Purity can be further improved. The wavelength range filtered by the filtering unit 126 may be, for example, about 420-500 nm overlapping the blue wavelength range, and the maximum filtered spectral intensity of the filtering unit 126 divided by its minimum filtered spectral intensity may be, for example, less than about 0.7. More specifically, in practical applications, the filtering unit 126 can be, for example, a film made of a small molecule dye having a half-width and a narrow width of the penetrating spectrum, wherein the film can utilize polyethylene terephthalate ( Polyethylene terephthalate (PET) is realized by a PET film produced by injection molding. In addition, the film may be formed on the target substrate directly by spin coating by means of modulation into a photoresist, but the invention is not limited thereto.

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

Here, in the embodiment of FIG. 4B, the backlight driving method in which the first light source 122a and the second light source 122b are simultaneously illuminated in the first sub-screen period SFP1 is taken as an example. However, in another exemplary embodiment, the backlight control circuit 130 may also separately illuminate the second light source 122b during the first sub-picture period SFP1 to provide only green light (G) as backlight in the SFP1 during the first sub-picture period. The source BL can achieve a better high NTSC mode, so the present invention is not limited to the driving sequence illustrated 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 illuminated during the first sub-picture period SFP to provide at least the second color light CL2 as a backlight. The source BL and the first light source 122a are individually illuminated in the second sub-picture period SFP2 to provide the first color light CL1 as the backlight BL", without departing from the scope of the present invention.

The specific architecture, driving timing, and illuminating spectrum of the backlight module 520 according to another embodiment of the present invention are illustrated below with reference to FIGS. 5-7B. Referring to FIG. 5, the backlight module 520 of the present embodiment is substantially similar to the control mode and application environment of the backlight module 120 of the foregoing FIG. The difference between the two is that the backlight module 520 of the embodiment includes the first light source 522a and the second light source 522b. It further includes a light conversion layer 524. The colors of the first light source 522a, the second light source 522b, and the light conversion layer 524 of the present embodiment are respectively 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 using a green fluorescent material. Moreover, 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 implemented using a blue fluorescent material, and so on.

In the present embodiment, for convenience of explanation, the first light source 522a is exemplified by a blue light source (for example, 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 exemplified by a red light source (for example, 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 exemplified by a green light conversion layer (for example, can be realized by a green fluorescent material, which can be realized by, for example, green nitride fluorescent powder, the wavelength corresponding to the characteristic peak. For example, it is 529/531/535 nm; or it can be realized by using common fluorescent powder such as green sulfide fluorescent powder. Any fluorescent powder that emits light in the green wavelength band can be applied to the implementation of the invention. In the example). 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). However, the invention is not limited to this.

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

Referring to FIG. 5, FIG. 6A and FIG. 6B, when the backlight module 520 is operated in the low NTSC mode, the first light source 522a and the second light source 522b are respectively controlled by the backlight control circuit (such as 130). The backlight control signal BL_522a and the second backlight control signal BL_522b are simultaneously illuminated, 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) In the example, it is red light (R)) to excite the third color light CL3 (in this embodiment, about white light (W)), so that the backlight module 520 provides the third color light CL3 as a display panel (such as 110). The backlight BL.

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

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

Referring to FIG. 5, FIG. 7A and FIG. 7B simultaneously, when the backlight module 520 is operated in the high NTSC mode, the first light source 522a and the second light source 522b are controlled by the backlight. The control circuit is illuminated according to different driving timings, so that the backlight module 520 provides the first color light CL1, the second color light CL2, and the third color light CL3 through the light conversion layer 524 during different sub-picture periods in the picture period. One is used as the backlight BL.

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 portion of one display picture during the first sub-picture period SFP1 in the picture period FP, the first light source 522a reacts The first backlight control signal BL_522a can be individually illuminated during the first sub-picture period SFP1 (the length of the period can also be designed by the designer) 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). Then, when the display panel receives the red picture material DATA_R corresponding to the red portion of one display picture during the second sub-picture period SFP2 in the picture period FP, the first backlight control signal BL_522a is switched to be disabled and the second backlight control signal is disabled. The BL_522b is switched to enable the second light source 522b to be separately illuminated during the second sub-picture period SFP2 in response to the enabled second backlight control signal BL_522b (the length of the period can also be designed by the designer) The red light (R) is provided as the backlight BL when the display panel displays a red screen (the first light source 522a is turned off in response to the disabled first backlight control signal BL_522a). Thereafter, when the display panel receives the green screen material DATA_G corresponding to the green portion of one display screen in the third sub-screen period SFP3 in the screen period FP, the first light source 522a and the second light source 522b respectively react to enable First backlight control signal BL_522a and second back The light control signal BL_522b is simultaneously illuminated during the third sub-picture period SFP3 (the length of the period can also be designed by the designer) to provide white light (W) as a backlight when the display panel displays a green screen. BL. Wherein, in the high NTSC mode, the light emission spectrums of the first color light CL1 and the second color light CL2 may be as shown in FIG. 7B, and the light emission spectrum of the third color light CL3 may be as shown in FIG. 6B.

In order to realize the function of improving the color saturation in the high NTSC mode, the color corresponding to the picture data received by the SFP1, SFP2, and SFP3 during the respective sub-picture periods is combined with 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 specifically, the color corresponding to the first color picture data received by the display panel during the first sub-picture (in the embodiment, the blue picture data is taken as an example) and the color of the first color light CL1 is substantially the same. The color corresponding to the second color picture data (in the embodiment, the red picture data in this embodiment) received by the display panel during the second sub-picture 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 (in the embodiment, the green picture data is taken as an example) is different from the colors of the first color light CL1 and the second color light CL2.

The backlight module 520 can implement the features and functions similar to those described in the foregoing embodiments of FIG. 1 to FIG. 4D, and therefore the same or overlapping points are not described herein again.

In another exemplary embodiment, when the display panel receives the green screen material DATA_G corresponding to the green portion of one display screen in the third sub-screen period SFP3 in the screen period FP, it may be separately illuminated during the screen period. a light source 522a for better green color rendering. In other words, in this exemplary embodiment, as seen in FIG. 7A, the first light source 522a is separately illuminated during the first sub-picture period SFP1 and SFP3, and the second light source 522b is during the second sub-picture period. SFP2 is lit separately for a period of time. That is, the first light source 522a and the second light source 522b are alternately illuminated during different sub-picture periods.

The backlight module 520 driven by the above driving timing can be applied to a general flat display or a stereoscopic display. Regardless of the type of display, it can realize white light with high luminous efficiency as a backlight in low NTSC mode as a backlight to save power, and provide corresponding color light according to the color sequence of the picture data in high NTSC mode. As a backlight to improve the color saturation of the display, the present invention does not limit the type of display to which the backlight module is applied.

In summary, the embodiment of the present invention provides a display that can provide two display modes with different color saturations for the viewer to select for use. In the low color saturation display mode, the backlight module can provide white light with high luminous efficiency as a backlight to save power consumption of the display. In the high color saturation display mode, 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. Therefore, the display of the embodiment of the present invention can display the screen by using an appropriate display mode according to the viewing requirements of the viewer, thereby achieving both the luminous efficiency and the display quality of the display.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of the present invention It is subject to the definition of the scope of the patent application attached.

100‧‧‧ display

110‧‧‧ display panel

120‧‧‧Backlight module

122a‧‧‧first light source

122b‧‧‧second light source

130‧‧‧Backlight control circuit

140‧‧‧Display drive circuit

BL‧‧‧Backlight

BL_122a‧‧‧First light source control signal

BL_122b‧‧‧Second light source control signal

CL1‧‧‧First color light

CL2‧‧‧Second shade

DATA_dp‧‧‧ screen material

S_mode‧‧‧ mode command

Claims (10)

A display device includes: a display panel; a backlight module disposed on a lower side of the display panel for providing a backlight to the display panel, wherein the backlight module includes a first color light a first light source, and a second light source for providing a second color light; a backlight control circuit coupled to the backlight module, configured to control the backlight module to operate in a first display mode and a second display One of the modes, wherein when the backlight module is operated in the first display mode, the backlight control circuit controls the first light source to provide the first color light as the backlight during a picture, and when the backlight When the module is operated in the second display mode, the backlight control circuit controls the first and the second light sources to provide the first and second sub-picture periods during the first sub-picture period and the second sub-picture period. At least one of the second color lights is used as the backlight. When the backlight module is operated in the second display mode, at least the second light source is illuminated during the first sub-picture period to provide at least the first two As the backlight light, the first light source and the second period in the sub-picture alone is illuminated, to provide the first color light as the backlight. The display device of claim 1, wherein when the backlight module is operated in the second display mode, the first light source and the second light source are simultaneously illuminated during the first sub-picture to provide the The first color light and the second color light are used as the backlight. The display of claim 1, wherein the display panel receives during the first sub-picture when the backlight module is operated in the second display mode a first color picture material, and receiving a second color picture material during the second sub-picture. The display of claim 3, wherein the first color light is white light, the second color light is green light or red light, and the color corresponding to the second color picture material is the same as the color of the second color light. And the colors corresponding to the first and the second color picture materials are different from each other. A display device includes: a display panel; a backlight module disposed on a lower side of the display panel for providing a backlight to the display panel, wherein the backlight module includes a first color light a first light source, and a second light source for providing a second color light; a backlight control circuit coupled to the backlight module, configured to control the backlight module to operate in a first display mode and a second display One of the modes, wherein when the backlight module is operated in the first display mode, the backlight control circuit controls the first light source to provide the first color light as the backlight during a picture, and when the backlight When the module is operated in the second display mode, the backlight control circuit controls the first and the second light sources to provide the first and second sub-picture periods during the first sub-picture period and the second sub-picture period. At least one of the second color lights is used as the backlight, wherein the second color light has at least a first characteristic peak and a second characteristic peak, the first characteristic peak is located in a first wavelength range and the Wherein two peaks located within a second wavelength range. The display of claim 5, wherein the first wavelength is The circumference is 400 to 480 nm, and the second wavelength range is 480 to 620 nm, and the spectral intensity of the first characteristic peak divided by the spectral intensity of the second characteristic peak is greater than 2.2. The display module of claim 5, wherein the backlight module further comprises: a filtering unit for filtering energy of the second color light in a third wavelength range, wherein the third wavelength range is The first wavelength ranges overlap each other, wherein the third wavelength range is 420-500 nm, and the maximum filtered spectral intensity of the filtering unit is divided by its minimum filtered spectral intensity by less than 0.7. The display of claim 7, wherein the first wavelength range is 400 to 480 nm, the second wavelength range is 480 to 620 nm, and the spectral intensity of the second characteristic peak is divided by the first The spectral intensity of a characteristic peak is less than 0.62. A display device includes: a display panel; a backlight module disposed on a lower side of the display panel for providing a backlight to the display panel, wherein the backlight module includes a first color light a first light source, and a second light source for providing a second color light; a backlight control circuit coupled to the backlight module, configured to control the backlight module to operate in a first display mode and a second display One of the modes, wherein when the backlight module is operated in the first display mode, the backlight control circuit controls the first light source to provide the first color light as the backlight during a picture, and when the backlight When the module is operated in the second display mode, the backlight control circuit controls the first and the second light sources to sequentially follow a first sub-picture of the picture period Providing at least one of the first and second color lights as the backlight during a second sub-picture period, the display further comprising a light conversion layer, when the backlight module is operated in the second display mode, The first and the second light source are controlled to sequentially provide the first, the first through the light conversion layer during the first sub-picture period, the second sub-picture period, and a third sub-picture period At least one of the second and a third color light is used as the backlight. The display device of claim 9, wherein the first light source is separately illuminated during the first sub-picture period to provide the first color light as the backlight through the light conversion layer, the first The two light sources are separately illuminated during the second sub-picture period to provide the second color light as the backlight through the light conversion layer, and the first light source and the second light source are in the third sub-picture period. At the same time, it is illuminated to provide the third color light as the backlight through the light conversion layer.