TWI423245B - Color gamut controlling method - Google Patents

Description

Color gamut control method

The present invention relates to a color gamut control method and a light source device using the color gamut control method; in particular, the present invention relates to a color gamut control method for a display and a light source device using the display device of the color gamut control method .

Display has become an indispensable product in modern life. As small as mobile phones, personal digital assistants (PDAs), MP3 players, as large as computers, TV screens, and projectors, they belong to the field of displays.

Taking a liquid crystal display (LCD) as an example, a conventional spatial color filter (SCF) technology has a single pixel (Pixel) composed of three sub-pixels (Sub-Pixel). The amount of light passing through the sub-pixel is determined by the electric field intensity controlled by a Thin Film Transistor (TFT) corresponding to each sub-pixel. The amount of light of each sub-pixel is modulated by the primary color filter corresponding to each sub-pixel, and the amount of each primary color of each sub-pixel is obtained. Among them, the common primary colors include red, green and blue. Finally, due to the persistence of vision, the human body visually perceives that the primary colors of the sub-pixels are mixed into the color that the pixel wants to express. Among them, the light source of the conventional SCF liquid crystal display technology must be white, such as a Cold Cathode Fluorescent Lamp (CCFL) or a white LED light source.

On the other hand, Field Sequential Liquid Crystal Display (FS-LCD), or Color Sequential LCD (CS-LCD), can improve system color gamut and saturation, and reduce The advantages of material cost and improved electro-optic conversion efficiency have also received increasing attention. The field sequential technology does not use color filters, and the color is formed by relying on the primary colors in the backlight module, and matching the liquid crystal pixel transmittance during the display time of each primary color light source to match the relative colors of the primary colors. The amount of light is then integrated by the visual system to the light stimulus to form and detect the color. The field sequential technology described herein can also be applied to a Light Emitting Diode (LED), an Organic Light-Emitting Diode, and a laser projector.

According to the display principle including the spatial color filter technology and the field sequential technology described above, the display color gamut of the conventional display is determined by the primary color light output by the light source. When the light source is selected, the display color gamut is fixed. However, the display color gamut of the display is often larger than the original set color gamut of the image to be displayed on the display. For example, the RGB display color gamut commonly used in displays is larger than the NTSC color gamut commonly used in images. The original color gamut of the image is not the same as the display color gamut of the display, which is likely to cause distortion of the color displayed on the display. There is room for improvement in the display mode described above.

The main object of the present invention is to provide a color gamut control method that can adjust the display color gamut.

Another object of the present invention is to provide a color gamut control method for improving the realism of image display colors.

Another object of the present invention is to provide a light source device that can adjust the color gamut of the output light.

Another object of the present invention is to provide a light source device having a more realistic light output color gamut.

The color gamut control method of the present invention comprises: sequentially outputting at least three primary color rays, and outputting the first primary color light according to the color gamut signal in the first primary color output period, and selectively outputting the primary color light other than the first primary color light; The output period outputs the second primary color light while selectively outputting the primary color light other than the second primary color light; and outputs the third primary color light during the third primary color output period while selectively outputting the primary color light other than the third primary color light.

The primary color light is continuous and cyclically output. The gamut control method further includes analyzing the display signal to generate a color gamut signal. The output of the primary color light other than the first primary color light is less than the output of the first primary color light. The output time of the primary color light other than the first primary color light is less than the first primary color output period.

The light source device of the present invention comprises at least three light sources for sequentially outputting primary color light and a control module. The control module receives the color gamut signal, and causes the first light source to output the first primary color light according to the color gamut signal in the first primary color output period, and selectively causes the light source other than the first light source to output the primary color light other than the first primary color light; And causing, by the second primary color output period, the second light source to output the second primary color light while selectively outputting the light source other than the second light source to the primary color light other than the second primary color light; and outputting the third primary color to the third primary color in the third primary color output period Light, while selectively causing a light source other than the third source to output a primary light other than the third primary light.

The light source is continuous and cyclically outputs primary color rays. The light source device further includes a signal analysis module that analyzes the display signal to generate a color gamut signal. The light source device further includes a color gamut selection module, the color gamut selection module has a color gamut menu, and the color gamut menu is available for the user to select, so that the color gamut selection module generates the color gamut signal. The light source is a red light source, a green light source, and a blue light source. In various embodiments, the light source is a red light source, a green light source, a blue light source, a cyan light source, and a yellow light source.

The present invention provides a color gamut control method and a light source device using the color gamut control method. In particular, in a preferred embodiment, the color gamut control method of the present invention is used in a field sequential display, that is, the light source device of the field sequential display uses the color gamut control method of the present invention. The display includes a liquid crystal display or a projector using a light emitting diode, an organic light emitting diode or a laser as a light source.

The light source device of the present invention comprises at least three light sources and a control module that sequentially and preferably continuously and cyclically output primary color light. FIG. 1 is a block diagram showing the circuit structure of the light source device of the present invention. In the preferred embodiment, the light source device 100 of the present invention includes a first light source 501 that outputs light of a first primary color, and a second light source that outputs light of a second primary color. 502 and a third light source 503 that outputs light of a third primary color and a control module 300. Specifically, in the preferred embodiment, the first, second, and third primary color light rays are red, green, and blue primary color rays, respectively. The first light source 501 outputs a red primary color light in a first primary color output period, the second light source 502 outputs a green primary color light in a second primary color output period, and the third light source 503 outputs a blue primary color light in a third primary color output period. The first primary color output period, the second primary color output period, and the third primary color output period have the same length of time, and are sequentially connected in a loop. In other words, the formation of the image is to display a full-color picture into three primary colors of red, green and blue, and use the principle of human vision to re-create the color in the human brain to form a full-color picture. In a preferred embodiment, the first light ray 501, the second light ray 502, and the third light ray 503 are primary color rays emitted by the light emitting diode, the organic light emitting diode, or the laser. Wherein, in the organic light emitting diode display, the display unit and the light source unit refer to the same object. However, in different embodiments, the first light 501, the second light 502, and the third light 503 may also be formed after the light generated by the backlight module passes through the color filter.

As shown in the circuit block diagram of the preferred embodiment of FIG. 1, the control module 300 receives the color gamut signal 201, and causes the first light source 501 to output red primary color light according to the color gamut signal 201 during the first primary color output period, and is selective. The light source other than the first light source 501 outputs the primary color light other than the red primary color light; the second light source 502 outputs the green primary color light during the second primary color output period, and selectively causes the light source other than the second light source 502 to output the green primary light. And the primary light source; and the third light source 503 outputs the blue primary light during the third primary color output period, and selectively causes the light source other than the third light source 503 to output the primary light other than the blue primary light. The control module 300 preferably directly adjusts the intensity of each primary color light in different time periods. However, in different embodiments, the control module 300 controls the arrangement of the liquid crystal molecules by adjusting the output voltage to change the intensity of the output primary color light.

In other words, the control module 300 instructs the first light source 501, the second light source 502, and the third light source 503 to output light according to the received color gamut signal 201. When the first light source 501 accepts the control module 300 to output the red primary color light during the first primary color output period, the second light source 502 and the third light source 503 can respectively receive the control module 300 to output or not output the green and blue primary color rays. . When the second light source 502 accepts the control module 300 to output the green primary color light during the second primary color output period, the first light source 501 and the third light source 503 can respectively receive the control module 300 to indicate whether to output the red or blue primary color light. . When the third light source 503 is instructed by the control module 300 to output the blue primary color light during the third primary color output period, the first light source 501 and the second light source 502 may respectively receive the control module 300 to indicate whether to output the red or green primary color light. .

Further, the above control module 300 instructs the first light source 501, the second light source 502, and the third light source 503 to output light according to the received color gamut signal 201 to cause the light source device 100 of the present invention to produce an effect. As shown in FIG. 2, the color gamut and the primary color light output are compared. In the preferred embodiment, the light source device includes a first light source, a second light source, and a third light source to output red, green, and blue primary colors. The relationship between the intensity of light and time is shown by L _R , L _G and L _B in the figure, respectively. Since only one primary color light source outputs primary color light in a time interval, the color gamut of the original output of the light source device should be the corresponding G1 point when purely outputting the red primary color light, the corresponding G1 point when purely outputting the green primary color light, and the pure output blue. The area enclosed by the B1 point corresponding to the primary color light.

As shown in FIG. 3, the color gamut and the primary color light output are compared, and if the first light source, the second light source, and the third light source are in the first and third primary color output periods, the light output mode remains unchanged, and the control module is The received color gamut signal indicates that the second light source outputs the green primary color light when the second primary color output period indicates that the second light source outputs the green primary color light, and indicates that the third light source does not output the red primary color light. Originally, the G1 point corresponding to the pure primary color light is output, and the light mixing effect is generated by the presence of the red primary color light output by the first light source, and the G2 point is changed. In other words, the color gamut change of the output of the light source device becomes a region surrounded by R1, G2, and B1. That is to say, by the above method, the effect of adjusting the color gamut can be achieved.

The effect of the light mixing can be controlled by controlling the amount of light of the different primary colors used to mix the light. For example, in this embodiment, if the time when the first primary light source outputs the blue primary color light in the second primary color output period is constant but the intensity is large, the G1 point changes to the G3 point as shown in FIG. 4; When the blue primary color light is outputted in the second primary color output period and the intensity is unchanged from FIG. 3 but the time is short, the G1 point changes to the G4 point as shown in FIG.

Further, in this embodiment, the control module instructs the first light source to output the blue primary color light according to the received color gamut signal and instructs the third light source to also output the red primary color light. The G1 point corresponding to the purely pure green primary light will be changed to the G5 point due to the presence of the blue primary color light output by the first light source and the red primary color light output by the third light source, so that the light source device outputs The gamut change becomes a region surrounded by R1, G5, and B1 as shown in FIG.

On the other hand, as shown in FIG. 7 , the color gamut and the primary color light output are compared, and if the first light source, the second light source, and the third light source remain in the first primary color output period, the light output mode remains unchanged, and the control is performed. The module instructs the first light source to output the blue primary color light according to the received color gamut signal during the second primary color output period, and indicates that the first light source outputs the blue primary color light and indicates that the third light source does not output the red primary color light; and the third primary color output period When the third light source is instructed to output the red primary color light, the first light source is instructed to output the blue primary color light and the second light source is instructed to output the green primary color light. Originally, the G1 point corresponding to the pure primary color light will be changed to become the G2 point due to the presence of the blue primary color light output by the first light source; the original R1 point corresponding to the pure primary color light will be The presence of the blue primary color light output by the first light source and the green primary color light output by the second light source causes a light mixing effect to be changed to point R2. At this time, the color gamut change output from the light source device becomes a region surrounded by R1, G2, and B2. In addition, in various embodiments, the light source may further be a light source of cyan, yellow, or other colors other than red, green, and blue light sources, and matched with each other.

A block diagram of a circuit structure of a different embodiment as shown in FIG. In the different embodiments, the light source device 100 further includes a signal analysis module 700 for analyzing the display signal 211 to generate the color gamut signal 201. Specifically, the display signal 211 includes an image signal of a television or a video recording medium, or a digital signal sent by a computer or a multimedia player. The display signal 211 can be an image signal of the built-in gamut signal 201. The color gamut signal 201 can be separated from the display signal 211 by the analysis of the signal analysis module 700. On the other hand, the display signal 211 can also be an image signal including a color gamut signal 201 and a pure video signal. The signal analysis module 700 can directly receive the color gamut signal 201 therein. In other words, the light source device 100 can analyze the color gamut signal 201 generated by the image signal including the television or the video recording medium by the signal analysis module 700 to perform color gamut adjustment, so that the light source device 100 outputs the color gamut of the light and the television or video recording medium. The original color gamut of the image is the same or similar, that is, it has a more realistic light output color gamut, thereby improving the realism of the image display color.

A block diagram of a circuit structure of a different embodiment as shown in FIG. The light source device further includes a color gamut selection module 900. The color gamut selection module 900 has a color gamut menu, and the color gamut menu is selectable by the user, so that the color gamut selection module 900 generates the color gamut signal 201. In other words, the user can achieve the effect of changing the color gamut by selecting the color gamut menu of the color gamut selection module 900.

FIG. 10 is a flowchart of a preferred embodiment of a color gamut control method according to the present invention. The color gamut control method of the present invention includes:

Step 1001 is to continuously and cyclically output at least three primary colors of light. In a preferred embodiment, the first light source 501 outputs the red primary color light during the first primary color output period, and the second light source 502 outputs the green primary color light during the second primary color output period, so that the third light source 503 is in the third primary color. The output color period outputs blue primary color rays. The first primary color output period, the second primary color output period, and the third primary color output period have the same length of time, and are sequentially connected in a loop.

Step 1003a is to output the first primary color light according to the color gamut signal in the first primary color output period, and selectively output the primary color light other than the first primary color light; step 1003b is to output the second primary color light in the second primary color output period, and select at the same time The primary color light other than the second primary color light is outputted in a normal manner; step 1003c is to output the third primary color light in the third primary color output period while selectively outputting the primary color light other than the third primary color light. The output of the primary color light other than the first primary color light may be smaller than the output of the first primary color light. The output time of the primary color light other than the first primary color light may be less than the first primary color output period.

In a preferred embodiment, the control module instructs the first light source, the second light source, and the third light source to output light according to the received color gamut signal. When the first light source receives the control module to instruct the output of the red primary color light during the first primary color output period, the second light source and the third light source respectively receive the control module to indicate output or not to output the green and blue primary color light. When the second light source accepts the control module to output the green primary color light during the second primary color output period, the first light source and the third light source respectively receive the control module to indicate whether to output or not to output red and blue primary color light. When the third light source receives the control of the blue primary color light in the third primary color output period, the first light source and the second light source may respectively receive the control module to indicate output or not to output red and green primary color light.

As shown in FIG. 11, the color gamut control method of the present invention, the color gamut control method of the present invention further comprises the step of analyzing the display signal to generate a color gamut signal. Specifically, the display signal includes an image signal of a television or a video recording medium. The display signal can be an image signal of the built-in gamut signal. The gamut signal can be separated from the display signal by analysis of the signal analysis module. On the other hand, the display signal can also be an image signal including a color gamut signal and a pure image signal. The signal analysis module can directly receive the gamut signal in it.

While the foregoing description of the preferred embodiments of the invention, the embodiments of the invention The spirit and scope of the principles of the invention. Modifications of many forms, structures, arrangements, ratios, materials, components and components can be made by those skilled in the art to which the invention pertains. Therefore, the embodiments disclosed herein are to be considered as illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and the legal equivalents thereof are not limited to the foregoing description.

100. . . Light source device

300. . . Control module

501. . . First light source

502. . . Second light source

503. . . Third light source

700. . . Signal analysis module

900. . . Color gamut selection module

1 is a block diagram showing the circuit structure of a preferred embodiment of the present invention;

2 to FIG. 7 are comparison diagrams of color gamut and primary color light output according to different embodiments of the present invention;

Figure 8 is a block diagram showing the circuit structure of different embodiments of the present invention;

Figure 9 is a block diagram showing the circuit structure of different embodiments of the present invention;

10 is a flow chart of a preferred embodiment of a color gamut control method according to the present invention;

11 is a flow chart of a preferred embodiment of a color gamut control method of the present invention.

Claims (10)

A color gamut control method includes: analyzing a display signal to generate a color gamut signal; sequentially outputting at least three primary color rays; and adjusting according to the color gamut signal, comprising: outputting a first primary color light in a first primary color output period, Simultaneously outputting primary ray rays other than the first primary color ray; outputting a second primary ray in a second primary color output period while selectively outputting primary ray rays other than the second primary ray; and outputting in a third primary color The third primary color light is outputted during the time period, and the primary color light other than the third primary color light is selectively outputted. The color gamut control method according to claim 1, wherein the primary color light rays are continuously and cyclically output. The color gamut control method according to claim 1, wherein the output of the primary color light other than the first primary color light is smaller than the output of the first primary color light. The color gamut control method according to claim 1, wherein an output time of the primary color light other than the first primary color light is smaller than the first primary color output period. A light source device includes: a signal analysis module that analyzes a display signal to generate a color gamut signal; at least three sequentially outputs a light source of primary color light; and a control module that receives the color gamut signal and according to the control signal: Disposing a first light source to output a first primary color light during a first primary color output period, and selectively causing a light source other than the first light source to output a primary color light other than the first primary color light; And causing a second light source to output a second primary color light during a second primary color output period, and selectively causing the light source other than the second light source to output the primary color light other than the second primary color light; and A third light source outputs a third primary color light, and selectively causes the light source other than the third light source to output the primary color light other than the third primary color light. The light source device of claim 5, wherein the light sources continuously and cyclically output primary color rays. The light source device of claim 5, further comprising a color gamut selection module, wherein the color gamut selection module has a color gamut menu, the color gamut menu is selectable by a user, and the color gamut selection module generates the color gamut Signal. The light source device of claim 5, wherein the light sources are a red light source, a green light source, and a blue light source. The light source device of claim 5, wherein the light sources are a red light source, a green light source, a blue light source, a cyan light source, and a yellow light source. The light source device of claim 5, the light source device can be applied to a light emitting diode (LED) light source liquid crystal display (LCD), a light emitting diode light source projector, and an organic light emitting diode Multi-primary display such as Organic Light-Emitting Diode display, laser projector, etc.