TWI547931B - Method for controlling display - Google Patents

Description

Method of controlling a display

The present invention relates to a method of controlling a display, and more particularly to a method of controlling an RGBW (red, green, blue and white) liquid crystal display.

With the advancement of display technology, liquid crystal displays have been widely used in mobile devices such as notebook computers, tablet computers, and smart phones. These mobile devices typically require lower power consumption to be used without charging for long periods of time. Since the transmittance of the liquid crystal panel of the RGB (red, green, and blue) liquid crystal display is relatively low, it can only penetrate 5 to 10% of the luminous intensity of the backlight, and the energy cannot be fully utilized. Therefore, it is necessary to consider changing the pixel design to increase penetration. Rate, so that the LCD display will consume less power when displaying the picture.

In addition, head-up displays for vehicles typically require high backlight brightness to allow images to be clearly projected onto the windshield in front of the driver's seat. However, the energy conversion rate of the conventional liquid crystal display is extremely low, and the liquid crystal panel can only penetrate 5 to 10% of the light intensity of the backlight panel, and the optical system leads the optical path to cause energy loss, so the energy cannot be fully utilized. Compared with RGB (red, green, and blue) liquid crystal displays, RGBW (red, green, blue and white) liquid crystal displays have a higher penetration rate of white sub-pixels, so the transmittance of RGBW liquid crystal displays can be greatly improved and consumed. The advantage of lower power. However, for a head-up display with low NTSC, simple picture composition, and no need to recognize small-letter text resolution, the conventional RGBW liquid crystal display driving method does not consider these characteristics of the head-up display. Therefore, it is not suitable for improving the display effect of the head-up display.

Embodiments of the present invention disclose a method for controlling a display. Above display The pixel unit includes a plurality of pixel units, and each pixel unit includes two red sub-pixels, two green sub-pixels, two blue sub-pixels, and a white sub-pixel. The method includes: receiving, by the display, image data of the first pixel and the second pixel; performing a first brightness conversion process to convert the red data value, the green data value, and the blue data value of the first pixel into the first pixel respectively Red adjusts the brightness value, the first green adjustment brightness value, and the first blue adjustment brightness value, and obtains the first white brightness value; performs a second brightness conversion process to change the red data value and the green data value of the second pixel And the blue data values are respectively converted into a second red adjusted brightness value, a second green adjusted brightness value, and a second blue adjusted brightness value, and the second white brightness value is obtained; the first white brightness value and the second white brightness value are obtained Adding values to obtain an additive white luminance value; determining whether the added white luminance value is greater than a critical value, determining a final white luminance value and a first compensation luminance value; and adjusting the first red luminance value and the first green color adjustment The brightness value, the first blue adjustment brightness value, the second red adjustment brightness value, the second green adjustment brightness value, and the second blue adjustment brightness value are respectively added to the first compensation brightness value to obtain the first a final red luminance value, a first final green luminance value, a first final blue luminance value, a second final red luminance value, a second final green luminance value, and a second final blue luminance value; the first final red luminance value, The first final green brightness value, the first final blue brightness value, the second final red brightness value, the second final green brightness value, the second final blue brightness value, and the final white brightness value are respectively converted into the first red output data value a first green output data value, a first blue output data value, a second red output data value, a second green output data value, a second blue output data value, and a white output data value; and the first red output data The value and the second red output data value drive the two red sub-pixels of the first pixel unit of the plurality of pixel units, and drive the first pixel unit according to the first green output data value and the second green output data value. The two green sub-pixels drive the two blue sub-pixels of the first pixel unit according to the first blue output data value and the second blue output data value, and output the data value according to the white color A first movable unit pixel white sub-pixel.

The invention can correct the shortcomings of the traditional RGBW liquid crystal display through the newly developed RGBW four primary color algorithm and the design of the new pixel unit, such as the saturated color picture is dark, unsaturated The color brightness is excessive, so the transmittance of the liquid crystal panel can be greatly improved without affecting the image quality. Furthermore, the two sets of RGB (red, green and blue) sub-pixels of the present invention share a white sub-pixel. Therefore, by the method of the present invention, the transmittance of the display when displaying a solid color or a white picture is higher than that of the conventional RGBW (red, green, blue and white) display. Therefore, the method of the present invention is very suitable for driving a head-up display for a head-up display having a low NTSC, a simple picture composition, and no need to recognize a small font resolution.

100A, 100B‧‧‧RGBW LCD

110A, 110B‧‧‧ pixel unit

120R‧‧‧Red sub-pixel

120G‧‧‧Green sub-pixel

120B‧‧‧Blue sub-pixel

120W‧‧‧White sub-pixel

500, 600‧‧‧ drive circuit

512, 572‧‧ Query Form

540‧‧‧Adder

550‧‧‧critical unit

570‧‧‧ Grayscale conversion unit

5101, 5102‧‧‧ gamma conversion unit

5201, 5202‧‧‧ minimum selection unit

5301, 5302‧‧‧ Subtraction unit

5601, 5602‧‧ Addition unit

(R ₁ , G ₁ , B ₁ ) ‧ ‧ image data of the first pixel

(R ₂ , G ₂ , B ₂ ) ‧ ‧ image data of the second pixel

Α‧‧‧adjustment parameters

Th‧‧‧ threshold

R ₁ , R ₂ ‧‧‧ red data values

G ₁ , G ₂ ‧ ‧ green data values

B ₁ , B ₂ ‧‧‧ blue data values

R _O1 ‧‧‧first red brightness value

G _O1 ‧‧‧First green brightness value

B _O1 ‧‧‧First blue brightness value

R _O2 ‧‧‧second red brightness value

G _O2 ‧‧‧second green brightness value

B _O2 ‧‧‧second blue brightness value

R _O1' ‧‧‧First red adjustment brightness value

G _O1' ‧‧‧First green adjustment brightness value

B _O1' ‧‧‧First blue adjustment brightness value

R _O2' ‧‧‧Second red adjustment brightness value

G _O2' ‧‧‧Second green adjustment brightness value

B _O2' ‧‧‧Second blue adjustment brightness value

W _O1 ‧‧‧first white brightness value

W _O2 ‧‧‧second white brightness value

W ₁₂ ‧‧‧Addition white brightness value

W _O ‧‧‧Final white brightness value

W _SUB ‧‧‧First compensation brightness value

R _F1 ‧‧‧first final red brightness value

G _F1 ‧‧‧First final green brightness value

B _F1 ‧‧‧First final blue brightness value

R _F2 ‧‧‧second final red brightness value

G _F2 ‧‧‧second final green brightness value

B _F2 ‧‧‧second final blue brightness value

R _F1' ‧‧‧ updated first final red brightness value

G _F1' ‧‧‧ updated first final green brightness value

B _F1' ‧‧‧Updated first final blue brightness value

R _F2' ‧‧‧Updated second final red brightness value

G _F2' ‧‧‧Updated second final green brightness value

B _F2' ‧‧‧Updated second final blue brightness value

W _O' ‧‧‧Updated final white brightness value

R _D1 ‧‧‧first red output data value

G _D1 ‧‧‧First green output data value

B _D1 ‧‧‧First blue output data value

R _D2 ‧‧‧second red output data value

G _D2 ‧‧‧second green output data value

B _D2 ‧‧‧second blue output data value

W _D ‧‧‧White output data value

L‧‧‧ Straight line

C _R1 , C _R2 , C _G1 , C _G2 , C _B1 , C _B2 , C _W ‧ ‧ center point

C _R , C _G , C _B ‧‧‧ midpoint

L1‧‧‧ first straight line

L2‧‧‧Second straight line

L3‧‧‧ third straight line

L4‧‧‧ fourth straight line

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

Fig. 2 is a schematic view showing the pixel unit of the RGBW liquid crystal display of Fig. 1.

FIG. 3 is a schematic diagram of an RGBW liquid crystal display according to another embodiment of the present invention.

Figure 4 is a schematic diagram of the pixel unit of the RGBW liquid crystal display of Figure 3.

Figure 5 is a schematic diagram of the drive circuit of the display of Figure 1 and/or Figure 3.

Figure 6 is a schematic diagram of another drive circuit of the display of Figure 1 and/or Figure 3.

FIG. 7 is a flow chart of a method for controlling a display according to an embodiment of the present invention.

In order to further improve the transmittance of the RGBW (red, green, blue and white) liquid crystal display, the present invention provides a new RGBW (red, green, blue and white) liquid crystal display, the two sets of RGB (red, green and blue) sub-pixels will share one White sub-pixels. Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic diagram of an RGBW liquid crystal display 100A according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a pixel unit 110A of the RGBW liquid crystal display 100A of FIG. 1 . The RGBW liquid crystal display 100A includes a plurality of pixel units 110A, each of the pixel units 110A including two red sub-pixels 120R, two green sub-pixels 120G, two blue sub-pixels 120B, and one white sub-pixel 120W. . Two center points C _R1 and C _R2 of the two red sub-pixels 120R of each pixel unit 110A, two center points C _G1 and C _{G2 of the} two green sub-pixels 120G, and two of the two blue sub-pixels 120B The center points C _B1 and C _B2 and the center point C _{W of the} white sub-pixel 120W will be on the same straight line L. In the present embodiment, the area of each of the red sub-pixels 120R, each of the green sub-pixels 120G, each of the blue sub-pixels 120B, and each of the white sub-pixels 120W is substantially equal. Each pixel unit 110A of the RGBW liquid crystal display 100A is equivalent to two pixels of a conventional RGB display, and when any of the pixel units 110A of the RGBW liquid crystal display 100A is driven, the RGBW liquid crystal display 100A receives the first pixel. Image data (R ₁ , G ₁ , B ₁ ) and second pixel image data (R ₂ , G ₂ , B ₂ ), wherein the image data (R ₁ , G ₁ , B ₁ ) and (R _{2 )} , G ₂ , B ₂ ) is used to drive two adjacent pixels of the same column (ie, coupled to the same scan line) in the conventional RGB display, and in the present embodiment, the image data of the first pixel (R) ₁ , G ₁ , B ₁ ) and the second pixel image data (R ₂ , G ₂ , B ₂ ) are used to drive one of the pixel units 110A in the RGBW liquid crystal display 100A.

Please refer to FIG. 3 and FIG. 4, FIG. 3 is a schematic diagram of an RGBW liquid crystal display 100B according to another embodiment of the present invention, and FIG. 4 is a schematic diagram of a pixel unit 110B of the RGBW liquid crystal display 100B of FIG. The RGBW liquid crystal display 100B includes a plurality of pixel units 110B, each of the pixel units 110B including two red sub-pixels 120R, two green sub-pixels 120G, two blue sub-pixels 120B, and one white sub-pixel 120W. . The two center points C _R1 and C _R2 of the two red sub-pixels 120R of each pixel unit 110B are on the first line L1, and the two center points C _G1 and C _{G2 of the} two green sub-pixels 120G are on the second line L2. on two blue sub-pixel two center points C and C _{Bl B2} on a third straight line L3, and the midpoint of the two center points C C _R 120B _Rl and _R2 is a C, C _Gl and two center points C _G2 midpoint C _G, two center points C _R1 and C _R2 C _R midpoint 120W white sub-pixel on the center point C _W fourth straight line L4, wherein a first straight line L1, the second straight line L2 and the second The three straight lines L3 are parallel to each other, and the fourth straight line L4 is perpendicular to the first straight line L1, the second straight line L2, and the third straight line L3. In the present embodiment, the area of each of the red sub-pixels 120R, each of the green sub-pixels 120G, each of the blue sub-pixels 120B, and each of the white sub-pixels 120W is also substantially equal. Each pixel unit 110B of the RGBW liquid crystal display 100B is also equivalent to two pixels of a conventional RGB display, and when any of the pixel units 110B of the RGBW liquid crystal display 100B is driven, the RGBW liquid crystal display 100B receives the first pixel. Image data (R ₁ , G ₁ , B ₁ ) and second pixel image data (R ₂ , G ₂ , B ₂ ), wherein the above image data (R ₁ , G ₁ , B ₁ ) and (R ₂ , G ₂ , B ₂ ) in the conventional RGB display is used to drive two adjacent pixels of the same row (ie, coupled to the same data line), and in the embodiment, the image data of the first pixel (R) ₁ , G ₁ , B ₁ ) and the second pixel image data (R ₂ , G ₂ , B ₂ ) are used to drive one of the pixel units 110B in the RGBW liquid crystal display 100B.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of the driving circuit 500 of the RGBW liquid crystal display 100A and/or 100B of FIG. 1 and/or FIG. When the driving circuit 500 controls a certain pixel unit 110A or 110B, the gamma conversion units 5101 and 5102 of the driving circuit 500 respectively receive the image data (R ₁ , G ₁ , B ₁ ) of the first pixel described above. Image data with the second pixel (R ₂ , G ₂ , B ₂ ). The image data (R ₁ , G ₁ , B ₁ ) of the first pixel includes the red data value R ₁ , the green data value G ₁ and the blue data value B ₁ of the first pixel, and the image of the second pixel The data (R ₂ , G ₂ , B ₂ ) includes the red data value R ₂ , the green data value G ₂ and the blue data value B _{2 of} the second pixel described above. In an embodiment of the invention, the first red luminance value R _O1 , the first green luminance value G _O1 , the first blue luminance value B _O1 , the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the first The two blue luminance values B _O2 are respectively gray levels, but the invention is not limited thereto. The gamma conversion unit 5101 converts the red data value R ₁ , the green data value G _{1 ,} and the blue data value B ₁ into a first red luminance value R _O1 , a first green luminance value G _{O1 ,} and a first blue luminance value, respectively. B _O1 , and the gamma conversion unit 5102 converts the red data value R ₂ , the green data value G _{2 ,} and the blue data value B ₂ into a second red luminance value R _O2 , a second green luminance value G _{O2 ,} and a second Blue brightness value B _O2 . In an embodiment of the invention, the first red luminance value R _O1 , the first green luminance value G _O1 , the first blue luminance value B _O1 , the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the first The two blue luminance values B _O2 can be expressed as: R _O1 = (R ₁ / 255) ^2.2 (1)

G _O1 =(G ₁ /255) ^2.2 (2)

B _O1 = (B ₁ / 255) ^2.2 (3)

R _O2 =(R ₂ /255) ^2.2 (4)

G _O2 = (G ₂ / 255) ^2.2 (5)

B _O2 = (B ₂ / 255) ^2.2 (6)

In other words, the gamma conversion unit 5101 divides the red data value R ₁ , the green data value G _{1 ,} and the blue data value B _{1 of the} first pixel by 255, and then performs a power of 2.2, respectively. A first red luminance value R _O1 , a first green luminance value G _{O1 ,} and a first blue luminance value B _{O1 are obtained} ; similarly, the gamma conversion unit 5102 converts the red data value R ₂ and the green data value of the second pixel. After dividing G ₂ and the blue data value B ₂ by 255, respectively, performing a power of 2.2 to obtain a second red luminance value R _O2 , a second green luminance value G _{O2 ,} and a second blue luminance value. B _O2 .

In an embodiment of the present invention, the gamma conversion units 5101 and 5102 may respectively have a lookup table 512, and the gamma conversion unit 5101 may be based on the red data value R ₁ , the green data value G _{1 ,} and the blue data value B. ₁ Find the corresponding first red luminance value R _O1 , the first green luminance value G _{O1 ,} and the first blue luminance value B _O1 from the lookup table 512 . Similarly, the gamma conversion unit 5102 can find the corresponding second red luminance value R _O2 and the second green luminance value G from the lookup table 512 according to the red data value R ₂ , the green data value G _{2 ,} and the blue data value B _{2 . O2} and the second blue luminance value B _O2 .

Further, the drive circuit 500 further has minimum value selecting units 5201 and 5202. The minimum value selecting unit 5201 is configured to set a half of the minimum value among the first red luminance value R _O1 , the first green luminance value G _{O1 ,} and the first blue luminance value B _O1 as the first white luminance value W _O1 , and the minimum The value selecting unit 5202 is configured to set a half of the minimum value among the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the second blue luminance value B _O2 as the second white luminance value W _O2 . The minimum value among the first red luminance value R _O1 , the first green luminance value G _{O1 ,} and the first blue luminance value B _{O1 is} represented by min[R _O1 , G _O1 , B _O1 ], and the second red luminance value R is The minimum value among _O2 , the second green luminance value G _O2 and the second blue luminance value B _{O2 is} represented by min[R _O2 , G _O2 , B _O2 ], then: W _O1 =min[R _O1 , G _O1 , B _O1 ]/2 (7)

W _O2 =min[R _O2 , G _O2 , B _O2 ]/2 (8)

In addition, the drive circuit 500 further has subtraction units 5301 and 5302. The subtraction unit 5301 is configured to subtract the first white luminance value W _O1 from the first red luminance value R _O1 , the first green luminance value G _O1 and the first blue luminance value B _O1 to obtain the first red luminance adjustment value. R _{O1 '} , the first green adjustment brightness value G _{O1 '} and the first blue adjustment brightness value B _{O1 '} . Similarly, the subtracting unit 5302 is configured to subtract the second white luminance value W _O2 from the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the second blue luminance value B _O2 to obtain the second red color. Adjusting the brightness value R _{O2 '} , the second green adjusting brightness value G _{O2 '} and the second blue adjusting brightness value B _{O2 '} . In other words, the first red adjustment brightness value R _{O1 '} , the first green adjustment brightness value G _{O1 '} , the first blue adjustment brightness value B _{O1 'the} second red adjustment brightness value R _{O2 '} , the second green adjustment brightness value G _{O2 '} And the second blue adjustment brightness value B _O2' can be expressed as: R _O1' = R _{O1 -} W _O1 (9)

G _O1' =G _O1 -W _O1 (10)

B _O1' =B _O1 -W _O1 (11)

R _O2' =R _O2 -W _O2 (12)

G _O2' =G _O2 -W _O2 (13)

B _O2' =B _O2 -W _O2 (14)

In addition, since the human eye feels that the ratio of light to dark of solid color and white is different from that of LCD with NTSC of 72%, the present invention can further understand the ratio of brightness of pure color (such as pure yellow) to white by human experiment. Qualitative influence. In an embodiment of the present invention, in order to make the image quality of the RGBW liquid crystal display 100A and/or 100B more suitable for the viewer's needs through actual human factors experiments, the first red adjusted brightness value R _{O1 ' is obtained} . Before a green adjustment brightness value G _{O1 ′} and a first blue adjustment brightness value B _{O1 ′} , the gamma conversion unit 5101 respectively sets the first red brightness value R _O1 , the first green brightness value G _O1 and the first blue brightness The value B _{O1 is} multiplied by the adjustment parameter α to update the first red luminance value R _O1 , the first green luminance value G _O1 and the first blue luminance value B _O1 , and the gamma conversion unit 5102 respectively sets the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the second blue luminance value B _{O2 are} multiplied by the adjustment parameter α to update the second red luminance value R _O2 , the second green luminance value G _{O2 ,} and the second blue luminance value B _O2 . That is, the above formulas (1) to (6) can be rewritten into the formula (15) to the formula (20): R _O1 = R _O1 × α = (R ₁ / 255) ^2.2 × α (15)

G _O1 =G _O1 ×α=(G ₁ /255) ^2.2 ×α (16)

B _O1 =B _O1 ×α=(B ₁ /255) ^2.2 ×α (17)

R _O2 =R _O2 ×α=(R ₂ /255) ^2.2 ×α (18)

G _O2 =G _O2 ×α=(G ₂ /255) ^2.2 ×α (19)

B _O2 =B _O2 ×α=(B ₂ /255) ^2.2 ×α (20)

In an embodiment of the present invention, the adjustment parameter α is set to be between 1.0 and 1.4 based on actual human factors experiments, so that the brightness when the RGBW liquid crystal display 100A and/or 100B displays a pure white picture is when the pure yellow picture is displayed. The brightness is 1.0 times to 1.4 times, which makes the image quality of the RGBW liquid crystal display 100A and/or 100B more suitable for the viewer.

In addition, the driving circuit 500 further includes an adder 540 for adding the first white luminance value W _O1 and the second white luminance value W _O2 to obtain an additive white luminance value W ₁₂ . That is, the addition white luminance value W ₁₂ can be expressed as follows: W ₁₂ = W _O1 + W _O2 (21)

The driving circuit 500 further includes a threshold value unit 550 for determining the final white luminance value W _O and the first compensation luminance value W _SUB by determining whether the addition white luminance value W ₁₂ is greater than the threshold value Th. In the present embodiment, the threshold value Th is set to 1, but the invention is not limited thereto. When the addition white luminance value W _{12 is} greater than or equal to the threshold value Th, the final white luminance value W _O will be equal to the threshold value Th, and the first compensation luminance value W _SUB will be equal to the addition white luminance value W ₁₂ and the threshold value Th One-half of the difference between the two; when the additive white luminance value W _{12 is} less than the threshold Th, the final white luminance value W _O will be equal to the additive white luminance value W ₁₂ , and the first compensated luminance value W _SUB will be equal to 0. In other words, the final white luminance value W _O and the first compensation luminance value W _SUB can be expressed as follows:

The purpose of setting the threshold value Th is to prevent the brightness of the white sub-pixel 120W driven by the driving circuit 500 from being too bright, and the first compensation brightness value W _SUB is used to enhance the same picture with the white sub-pixel 120W. The brightness of the other color sub-pixels in the prime unit 110A or 110B compensates for the overall luminance loss of the pixel unit 110A or 110B caused by the white luminance value W ₁₂ exceeding the critical value Th. In detail, the drive circuit 500 further includes addition units 5601 and 5602. The adding unit 5601 is configured to add the first red adjusted brightness value R _{O1 ′} , the first green adjusted brightness value G _{O1 ′,} and the first blue adjusted brightness value B _{O1 ′} to the first compensated brightness value W _SUB , respectively, to obtain The first final red luminance value R _F1 , the first final green luminance value G _{F1 ,} and the first final blue luminance value B _F1 . Similarly, the adding unit 5602 is configured to add the second red adjusted brightness value R _{O2 ′} , the second green adjusted brightness value G _{O 2 ′,} and the second blue adjusted brightness value B _{O 2 ′} to the first compensated brightness value W _SUB , respectively. A second final red luminance value R _F2 , a second final green luminance value G _{F2 ,} and a second final blue luminance value B _{F2 are obtained} . a first final red luminance value R _F1 , a first final green luminance value G _F1 , a first final blue luminance value B _F1 , a second final red luminance value R _F2 , a second final green luminance value G _{F2 ,} and a second final blue The color luminance value B _F2 can be expressed as follows: R _F1 =R _O1' +W _SUB (23)

G _F1 =G _O1' +W _SUB (24)

B _F1 =B _O1' +W _SUB (25)

R _F2 =R _O2' +W _SUB (26)

G _F2 =G _O2' +W _SUB (27)

B _F2 =B _O2' +W _SUB (28)

The driving circuit 500 further has a gray scale converting unit 570 for the first final red luminance value R _F1 , the first final green luminance value G _F1 , the first final blue luminance value B _F1 , the second final red luminance value R _F2 , The second final green luminance value G _F2 , the second final blue luminance value B _{F2 ,} and the final white luminance value W _O are respectively converted into a first red output data value R _D1 , a first green output data value G _D1 , and a first blue The output data value B _D1 , the second red output data value R _D2 , the second green output data value G _D2 , the second blue output data value B _{D2 ,} and the white output data value W _D . In detail, the grayscale conversion unit 570 is configured to perform inverse gamma conversion to convert the first final red luminance value R _F1 representing the luminance value, the first final green luminance value G _F1 , and the first final blue. The luminance value B _F1 , the second final red luminance value R _F2 , the second final green luminance value G _F2 , the second final blue luminance value B _{F2 ,} and the final white luminance value W _O are respectively converted into a first red representing a grayscale value. Output data value R _D1 , first green output data value G _D1 , first blue output data value B _D1 , second red output data value R _D2 , second green output data value G _D2 , second blue output data value B _D2 and white output data value W _D . Further, the grayscale conversion unit 570 will first map the first final red luminance value R _F1 , the first final green luminance value G _F1 , the first final blue luminance value B _F1 , and the second final red luminance value R _F2 , The second final green luminance value G _F2 , the second final blue luminance value B _{F2 ,} and the final white luminance value W _O are respectively subjected to a calculation of 2.2 minutes, and then multiplied by 255, respectively. In other words, the first red output data value R _D1 , the first green output data value G _D1 , the first blue output data value B _D1 , the second red output data value R _D2 , the second green output data value G _D2 , the second The blue output data value B _D2 and the white output data value W _D can be expressed as: R _D1 = (R _F1 ) ^{1 / 2.2} × 255 (29)

G _D1 = (G _F1 ) ^1/2.2 × 255 (30)

B _D1 = (B _F1 ) ^1/2.2 × 255 (31)

R _D2 =(R _F2 ) ^1/2.2 ×255 (32)

G _D2 = (G _F2 ) ^1/2.2 × 255 (33)

B _D2 = (B _F2 ) ^1/2.2 × 255 (34)

W _D1 = (W _O ) ^1/2.2 × 255 (35)

After that, the driving circuit 500 drives the two red sub-pixels 120R of the pixel unit 110A or 110B to be driven according to the first red output data value R _F1 and the second red output data value R _F2 , and outputs data according to the first green color. The value G _F1 and the second green output data value G _F2 drive the two green sub-pixels 120G of the pixel unit 110A or 110B to be driven, and according to the first blue output data value B _F1 and the second blue output data value B _F2 drives the two blue sub-pixels 120B of the pixel unit 110A or 110B to be driven, and the white sub-pixel 120W of the pixel unit 110A or 110B to be driven in accordance with the white output data value W _D .

In an embodiment of the invention, the grayscale conversion unit 570 can have a lookup table 572, and the grayscale conversion unit 570 can be based on the first final red luminance value R _F1 , the first final green luminance value G _F1 , and the first final blue. The brightness value B _F1 , the second final red brightness value R _F2 , the second final green brightness value G _F2 , the second final blue brightness value B _{F2 ,} and the final white brightness value W _{O are found} from the lookup table 572 to correspond to the first Red output data value R _D1 , first green output data value G _D1 , first blue output data value B _D1 , second red output data value R _D2 , second green output data value G _D2 , second blue output data Value B _D2 and white output data value W _D .

Please refer to FIG. 6. FIG. 6 is a schematic diagram of another driving circuit 600 of the display of FIG. 1 and/or FIG. The biggest difference between the driving circuit 600 and the driving circuit 500 is that the driving circuit 600 further includes a brightness compensation unit 610. The purpose of setting the brightness compensation unit 610 is to prevent the brightness of the red sub-pixel 120R, the green sub-pixel 120G, and/or the blue sub-pixel 120B driven by the driving circuit 600 from being too bright. The brightness compensation unit 610 determines the second compensation by determining whether the maximum value among the first final red brightness value R _F1 , the first final green brightness value G _{F1 ,} and the first final blue brightness value B _F1 is greater than the threshold value Th described above. Brightness value. It is assumed that the second compensated luminance value is represented by V, and the maximum value among the first final red luminance value R _F1 , the first final green luminance value G _F1 and the first final blue luminance value B _F1 is max[R _F1 , G _F1 , B _F1 ] indicates that the second compensated luminance value V can be expressed by the following formula:

After the second compensated luminance value V is obtained, the luminance compensation unit 610 subtracts the first final red luminance value R _F1 , the first final green luminance value G _{F1 ,} and the first final blue luminance value B _F1 , respectively. Second, the brightness value V is compensated to update the first final red brightness value R _F1 , the first final green brightness value G _F1 and the first final blue brightness value B _F1 , that is, the updated first final red brightness value R _{F1 ′} The first final green luminance value G _{F1 ′} and the first final blue luminance value B _{F1 ′} can be expressed as: R _F1′ = R _F1 −V (37)

G _F1' =G _F1 -V (38)

B _F1' = B _F1 -V (39)

In addition, the brightness compensation unit 610 updates the final white brightness value W _O by adding the final white brightness value W _{O to} the second compensation brightness value V. In other words, the updated final white luminance value W _{O '} can be expressed as: W _O' = W _O + V (40)

Furthermore, the brightness compensation unit 610 can also be used to determine whether the maximum value among the second final red brightness value R _F2 , the second final green brightness value G _F2 and the second final blue brightness value B _F2 is greater than the above threshold value. Th, determines the third compensation brightness value. It is assumed that the third compensated luminance value is represented by U, and the maximum of the second final red luminance value R _F2 , the second final green luminance value G _F2 and the second final blue luminance value B _F2 is max[R _F2 , G _F2 , B _F2 ] indicates that the third compensated luminance value U can be expressed by the following formula: (41)

After the third compensated luminance value U is obtained, the luminance compensation unit 610 subtracts the second final red luminance value R _F2 , the second final green luminance value G _{F2 ,} and the second final blue luminance value B _F2 , respectively. Thirdly compensating the brightness value U to update the second final red brightness value R _F2 , the second final green brightness value G _F2 and the second final blue brightness value B _F2 , that is, the updated second final red brightness value R _{F2 ′} The second final green luminance value G _{F2 ′} and the second final blue luminance value B _{F2 ′} can be expressed as: R _F2′ = R _F2 −U (42)

G _F2' =G _F2 -U (43)

B _F2' = B _F2 -U (44)

In addition, the brightness compensation unit 610 updates the final white brightness value W _O by adding the final white brightness value W _{O to} the second compensation brightness value V and the third compensation brightness value U. In other words, the above formula (41) can be corrected as follows: W _O' = W _O + V + U (45)

Since the brightness compensation unit 610 has updated the first final red brightness value R _F1 , the first final green brightness value G _F1 , the first final blue brightness value B _F1 , the second final red brightness value R _F2 , and the second final green brightness The value G _F21 , the second final blue luminance value B _{F2 ,} and the final white luminance value W _O , so that the above equations (29) to (35) can be rewritten into equations (46) to (52): R _D1 = (R _F1' ) ^1/2.2 × 255 (46)

G _D1 = (G _F1' ) ^1/2.2 × 255 (47)

B _D1 = (B _F1' ) ^1/2.2 × 255 (48)

R _D2 =(R _F2' ) ^1/2.2 ×255 (49)

G _D2 = (G _F2' ) ^1/2.2 × 255 (50)

B _D2 = (B _F2' ) ^1/2.2 × 255 (51)

W _D1 = (W _O' ) ^1/2.2 × 255 (52)

For convenience of description, the driving circuit 500 converts the red data value R ₁ , the green data value G ₁ and the blue data value B ₁ into the first by the gamma conversion unit 5101, the minimum value selection unit 5201, and the subtraction unit 5301, respectively. The program for adjusting the brightness value R _{O1 ′} , the first green color adjustment brightness value G _{O1 ′,} and the first blue color adjustment brightness value B _{O1 ′} and obtaining the first white brightness value W _O1 may be referred to as “first brightness conversion program”. The driving circuit 500 converts the red data value R ₂ , the green data value G _{2 ,} and the blue data value B ₂ into the second red adjusted brightness value R by the gamma conversion unit 5102, the minimum value selecting unit 5202, and the subtraction unit 5302, respectively. _{O2 ',} a second green luminance adjustment value G _O2' to adjust the brightness and the second blue value B _{O2 'and} the luminance value obtained by the second white W _O2 program may be referred to as "second brightness conversion process." Please refer to FIG. 7. FIG. 7 is a flow chart of a method for controlling a display according to an embodiment of the present invention. In this embodiment, the method for controlling the display includes the following steps: Step S710: the display receives the image data (R ₁ , G ₁ , B ₁ ) of the first pixel and the image data of the second pixel (R ₂ , G ₂ , B ₂ ); Step S720: performing the first brightness conversion process and the second brightness conversion process described above; Step S730: adding the first white brightness value W _O1 and the second white brightness value W _O2 to obtain Adding white luminance value W ₁₂ ; Step S740 : determining the final white luminance value W _O and the first compensation luminance value W _SUB by determining whether the addition white luminance value W ₁₂ is greater than the threshold value Th; step S750: first red Adjusting the brightness value R _{O1 '} , the first green adjustment brightness value G _{O1 '} , the first blue adjustment brightness value B _{O1 '} , the second red adjustment brightness value R _{O2 '} , the second green adjustment brightness value G _{O2 '} and the second The blue adjustment brightness value B _{O2 ′ is} respectively added with the first compensation brightness value W _SUB to obtain the first final red brightness value R _F1 , the first final green brightness value G _F1 , the first final blue brightness value B _F1 , second final luminance value of red R _F2, second final green luminance value and the second final blue G _F2 Value B _F2; Step S760: the first final luminance value of red R _F1, first final green luminance value G _F1, first final blue luminance value B _F1, a second red luminance value of the final R _F2, a second final green The luminance value G _F2 , the second final blue luminance value B _{F2 ,} and the final white luminance value W _O are respectively converted into a first red output data value R _D1 , a first green output data value G _D1 , and a first blue output data value B _D1 , second red output data value R _D2 , second green output data value G _D2 , second blue output data value B _D2 and white output data value W _D ; and step S770: output data value R _D1 according to the first red And the second red output data value R _D2 drives the two red sub-pixels 120R of the first pixel unit in the pixel unit, and drives the first according to the first green output data value G _D1 and the second green output data value G _D2 The two green sub-pixels 120G of the pixel unit drive the two blue sub-pixels 120B of the first pixel unit according to the first blue output data value B _D1 and the second blue output data value B _D2 , and according to white W _D output data values of the first pixel driving unit white Pixel 120W.

The invention can correct the shortcomings of the traditional RGBW liquid crystal display through the newly developed RGBW four primary color algorithm and the design of the novel pixel unit, such as the saturated color picture is dark and the unsaturated color is excessive in brightness, so the penetration of the liquid crystal panel can be greatly improved. The rate does not affect the image quality. Furthermore, the two sets of RGB (red, green and blue) sub-pixels of the present invention share a white sub-pixel. Therefore, by the method of the present invention, the transmittance of the display when displaying a solid color or a white picture is higher than that of the conventional RGBW (red, green, blue and white) display. Therefore, the method of the present invention is very suitable for driving a head-up display for a head-up display having a low NTSC, a simple picture composition, and no need to recognize a small font resolution.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

500‧‧‧ drive circuit

512, 572‧‧ Query Form

540‧‧‧Adder

550‧‧‧critical unit

570‧‧‧ Grayscale conversion unit

5101, 5102‧‧‧ gamma conversion unit

5201, 5202‧‧‧ minimum selection unit

5301, 5302‧‧‧ Subtraction unit

5601, 5602‧‧ Addition unit

Α‧‧‧adjustment parameters

Th‧‧‧ threshold

R ₁ , R ₂ ‧‧‧ red data values

G ₁ , G ₂ ‧ ‧ green data values

B ₁ , B ₂ ‧‧‧ blue data values

R _O1 ‧‧‧first red brightness value

G _O1 ‧‧‧First green brightness value

B _O1 ‧‧‧First blue brightness value

R _O2 ‧‧‧second red brightness value

G _O2 ‧‧‧second green brightness value

B _O2 ‧‧‧second blue brightness value

R _O1' ‧‧‧First red adjustment brightness value

G _O1' ‧‧‧First green adjustment brightness value

B _O1' ‧‧‧First blue adjustment brightness value

R _O2' ‧‧‧Second red adjustment brightness value

G _O2' ‧‧‧Second green adjustment brightness value

B _O2' ‧‧‧Second blue adjustment brightness value

W _O1 ‧‧‧first white brightness value

W _O2 ‧‧‧second white brightness value

W ₁₂ ‧‧‧Addition white brightness value

W _O ‧‧‧Final white brightness value

W _SUB ‧‧‧First compensation brightness value

R _F1 ‧‧‧first final red brightness value

G _F1 ‧‧‧First final green brightness value

B _F1 ‧‧‧First final blue brightness value

R _F2 ‧‧‧second final red brightness value

G _F2 ‧‧‧second final green brightness value

B _F2 ‧‧‧second final blue brightness value

R _D1 ‧‧‧first red output data value

G _D1 ‧‧‧First green output data value

B _D1 ‧‧‧First blue output data value

R _D2 ‧‧‧second red output data value

G _D2 ‧‧‧second green output data value

B _D2 ‧‧‧second blue output data value

W _D ‧‧‧White output data value

Claims (11)

A method for controlling a display, the display comprising a plurality of pixel units, each pixel unit comprising two red sub-pixels, two green sub-pixels, two blue sub-pixels, and a white sub-pixel, The method includes: receiving, by the display, image data of a first pixel and image data of a second pixel; performing a first brightness conversion process to convert a red data value and a green data value of the first pixel and Converting a blue data value into a first red adjustment brightness value, a first green adjustment brightness value, and a first blue adjustment brightness value, and obtaining a first white brightness value; performing a second brightness conversion process, Converting a red data value, a green data value, and a blue data value of the second pixel into a second red adjusted brightness value, a second green adjusted brightness value, and a second blue adjusted brightness value, respectively. And determining a second white brightness value; adding the first white brightness value to the second white brightness value to obtain an added white brightness value; determining whether the added white brightness value is greater than a critical value Value a final white brightness value and a first compensation brightness value; the first red adjustment brightness value, the first green adjustment brightness value, the first blue adjustment brightness value, the second red adjustment brightness value, the second The green adjustment brightness value and the second blue adjustment brightness value are respectively added to the first compensation brightness value to obtain a first final red brightness value, a first final green brightness value, and a first final blue brightness value. a second final red luminance value, a second final green luminance value, and a second final blue luminance value; the first final red luminance value, the first final green luminance value, and the first final blue luminance The value, the second final red luminance value, the second final green luminance value, the second final blue luminance value, and the final white luminance value are respectively converted into a first red output data value, a first green output data value, a first blue output data value, a second red Outputting a data value, a second green output data value, a second blue output data value, and a white output data value; and driving the pixel units according to the first red output data value and the second red output data value Two red sub-pixels of a first pixel unit, driving two green sub-pixels of the first pixel unit according to the first green output data value and the second green output data value, according to the first blue The color output data value and the second blue output data value drive the two blue sub-pixels of the first pixel unit, and drive the white sub-pixel of the first pixel unit according to the white output data value. The method of claim 1, wherein the first brightness conversion program comprises: converting the red data value, the green data value, and the blue data value of the first pixel into a first red brightness value, respectively a first green luminance value and a first blue luminance value; obtaining the first white luminance value according to the first red luminance value, the first green luminance value, and the first blue luminance value; and the first And subtracting the first white brightness value from the red brightness value, the first green brightness value, and the first blue brightness value to obtain the first red adjusted brightness value, the first green adjusted brightness value, and the first The blue brightness adjustment program includes: converting the red data value, the green data value, and the blue data value of the second pixel into a second red brightness value and a second green color, respectively. a brightness value and a second blue brightness value; obtaining the second white brightness value according to the second red brightness value, the second green brightness value, and the second blue brightness value; and the second red brightness value The second green brightness And the second blue brightness value is subtracted from the second blue brightness value to obtain the second red adjusted brightness value, the second green adjusted brightness value, and the second blue adjusted brightness value. The method of claim 2, wherein the first brightness conversion program further comprises: before determining the first red adjusted brightness value, the first green adjusted brightness value, and the first blue adjusted brightness value, respectively The first red brightness value, the first green brightness value, and the first blue brightness value are multiplied by an adjustment parameter to update the first red brightness value, the first green brightness value, and the first blue brightness The second brightness conversion program further includes: respectively, before determining the second red adjusted brightness value, the second green adjusted brightness value, and the second blue adjusted brightness value, respectively, the second red brightness value, The second green brightness value and the second blue brightness value are multiplied by the adjustment parameter to update the second red brightness value, the second green brightness value, and the second blue brightness value. The method of claim 3, wherein the adjustment parameter is between 1.0 and 1.4. The method of claim 2, 3 or 4, wherein the red data value, the green data value, and the blue data value of the first pixel are respectively converted into the first red luminance value, the first green The brightness value and the first blue brightness value include: dividing the red data value, the green data value, and the blue data value of the first pixel by 255, respectively, and performing a power of 2.2; Converting the red data value, the green data value, and the blue data value of the second pixel into the second red brightness value, the second green brightness value, and the second blue brightness value respectively: The red data value, the green data value, and the blue data value of the second pixel are respectively divided by 255, and then the operation of 2.2 is performed separately. The method of claim 1, wherein the first final red luminance value, the first final green luminance value, the first final blue luminance value, the second final red luminance value, the second most The final green luminance value, the second final blue luminance value, and the final white luminance value are respectively converted into the first red output data value, the first green output data value, the first blue output data value, and the second The red output data value, the second green output data value, the second blue output data value, and the white output data value include: the first final red luminance value, the first final green luminance value, the first final The blue luminance value, the second final red luminance value, the second final green luminance value, the second final blue luminance value, and the final white luminance value are respectively subjected to a calculation of 2.2 minutes, and then separately Multiply by 255. The method of claim 1, wherein the obtaining the first white luminance value according to the first red luminance value, the first green luminance value, and the first blue luminance value comprises: the first red luminance value, The first green brightness value and a half of the minimum value of the first blue brightness value are set as the first white brightness value; wherein the second red brightness value, the second green brightness value, and the second blue brightness are determined according to the second red brightness value And obtaining the second white luminance value includes: setting the half of the second red luminance value, the second green luminance value, and the minimum value of the second blue luminance value to the second white luminance value. The method of claim 1, wherein the first compensated luminance value is equal to one-half of a difference between the additive white luminance value and the threshold value, provided that the additive white luminance value is greater than the threshold value. . The method of claim 1, further comprising: determining whether the first final red luminance value, the first final green luminance value, and the maximum value of the first final blue luminance value are greater than the threshold value a second compensated brightness value; by the first final red brightness value, the first final green brightness value, and the first final blue The color luminance values are respectively subtracted from the second compensation luminance values to update the first final red luminance value, the first final green luminance value, and the first final blue luminance value; and by adding the final white luminance value The second compensated brightness value is added to update the final white brightness value. The method of claim 1, wherein two center points of the two red sub-pixels of each pixel unit, two center points of the two green sub-pixels, and two of the two blue sub-pixels The center point and the center point of the white sub-pixel are on the same line. The method of claim 1, wherein the two center points of the two red sub-pixels of each pixel unit are on a first line, and the two center points of the two green sub-pixels are in a second On the straight line, the two center points of the two blue sub-pixels are on a third line, and the midpoints of the two center points of the two red sub-pixels, and the two center points of the two green sub-pixels a midpoint, a midpoint of two center points of the two blue sub-pixels, and a center point of the white sub-pixel on a fourth line, wherein the first line, the second line, and the third line are parallel to each other And the fourth line is perpendicular to the first line, the second line, and the third line.