TWI688945B - Display device and driving method - Google Patents

Abstract

A driving method includes: displaying a first color field, a second color field and a third color field in sequence to constitute a first frame; displaying the second color field, the third color field and the first color field in sequence to constitute a second frame; displaying the third color field, the first color field and the second color field in sequence to constitute a third field; and repeating displaying the first frame, the second frame and the third frame to constitute an output image.

Description

Display device and driving method

The present disclosure relates to a display device and driving method, and in particular to a field sequential liquid crystal display device (Field Sequential Color Liquid Crystal Display, FSC-LCD) and driving method.

With the development of technology, the demand for high-resolution panels is becoming more and more extensive. The field sequential liquid crystal display can not only improve the development bottleneck of the traditional LCD display in terms of resolution, thereby improving the color gamut and saturation of the system, reducing the material cost, etc., but also greatly improving the electro-optical conversion performance of the display panel. Therefore, it is quite competitive for the technical requirements of flat display with wide color gamut, high resolution and low power consumption.

However, with the movement of the display object or the line of sight of the human eye, a color breakup (CBU) phenomenon is formed at the edge of the object in the image of the field sequential liquid crystal display. Therefore, how to improve color separation is the current design consideration and challenge.

An embodiment of this disclosure relates to a driving method The method includes: displaying the first color field, the second color field and the third color field in sequence to form the first frame of the picture; then displaying the second color field, the third color field and the first color field in sequence to form the second Frame picture; then display the third color field, the first color field and the second color field in order to form the third frame picture; and repeatedly display the first frame picture, the second frame picture and the third frame picture in order to form the output image.

Another embodiment of the present disclosure relates to a display device including a backlight element and a first driver. The backlight element includes a plurality of backlight areas. The backlight area includes a first area, a second area, and a third area. The first driver is coupled to the backlight element. The first driver is used to perform the following operations: drive the first area to display the first color, the second area to display the second color, and the third area to display the third color to form the first color field; drive the first area to display the second color, The second area displays a third color, the third area displays a first color to form a second color field; the first area is driven to display a third color, the second area displays a first color, and the third area displays a second color to form A third color field; and driving the backlight element to sequentially display the first color field, the second color field, and the third color field to form a first frame of image.

100‧‧‧Display device

120‧‧‧Memory

140, 140a, 140b ‧‧‧ driver

160‧‧‧Backlight components

180‧‧‧Liquid crystal element

D1~Dm, D1~Dk, Dk+1~D2k……Dxk‧‧‧Data cable

G1~Gn, Gn+1~G2n‧‧‧scan line

Z0, Z11~ZMN, A11~AMN, B11~BMN‧Backlight area

Px‧‧‧ pixels

Rled, Gled, Bled‧‧‧Lighting element

R, G, B‧‧‧ color

c1~cN, c1~c8, r1~rN, d1~dN‧‧‧Backlight area

Fd1, Fd2, Fd3 ‧‧‧ color field

T1~TN, TN+1~T2N, T2N+1~T3N during ‧‧‧

Fa1, Fa2, Fa3 ‧‧‧ frames

During P0, P1~P9‧‧‧

400‧‧‧Drive method

S420, S440, S460‧‧‧Operation

LCD, LED‧‧‧ Timing diagram

cy1~cy8‧‧‧LCD area

t1~t37‧‧‧‧

ON‧‧‧Drive signal

PB‧‧‧period

M1~Mx‧‧‧Multiplexer

L1~Lx‧‧‧Signal cable

FIG. 1 is a schematic diagram of a display device according to some embodiments of the present disclosure.

FIG. 2A is a schematic diagram illustrating another display device according to some embodiments of the present disclosure.

FIG. 2B is a schematic diagram illustrating a backlight area according to some embodiments of the present disclosure.

FIG. 3 is a schematic diagram of a backlight element displaying a frame according to some embodiments of the present disclosure.

FIG. 4 is a flowchart illustrating a driving method according to some embodiments of the present disclosure.

FIG. 5 is a schematic diagram illustrating a backlight element displaying multiple frames according to some embodiments of the present disclosure.

FIG. 6 is a timing diagram illustrating display of a liquid crystal element and a backlight element according to some embodiments of the present disclosure.

FIG. 7 is a schematic diagram illustrating another display device according to other embodiments of the present disclosure.

FIG. 8A is a schematic diagram illustrating another display device according to other embodiments of the present disclosure.

FIG. 8B is a timing diagram illustrating display by a liquid crystal element and a backlight element according to some embodiments of FIG. 8A.

FIG. 9A is a schematic diagram illustrating a backlight element displaying a color field according to some embodiments of the present disclosure.

FIG. 9B is a schematic diagram illustrating a backlight element displaying three color fields according to some embodiments of the present disclosure.

FIG. 10A is a schematic diagram illustrating a backlight element displaying a color field according to some embodiments of the present disclosure.

FIG. 10B is a schematic diagram illustrating a backlight element displaying three color fields according to some embodiments of the present disclosure.

The following is a detailed description of the embodiments in conjunction with the drawings, but the specific embodiments described are only used to explain the case, not to limit the case, and the description of the structural operation is not used to limit the order of execution, any component The recombined structure and the resulting devices with equal effects are all covered by the disclosure.

Terms used throughout the specification and the scope of patent application, unless otherwise specified, usually have the ordinary meaning that each term is used in this field, in the content disclosed herein, and in special content.

The terms "first", "second", "third", etc. used in this article do not specifically refer to order or order, nor are they intended to limit the present disclosure. The term describes the element or operation only.

In addition, as used herein, "coupled" or "connected" can refer to two or more elements making direct physical or electrical contact with each other, or indirectly making physical or electrical contact with each other, or can refer to two or Multiple elements interoperate or act.

Please refer to Figure 1. FIG. 1 is a schematic diagram of a display device 100 according to some embodiments of the present disclosure. As shown in FIG. 1, the display device 100 includes a memory 120, a driver 140, a backlight element 160 and a liquid crystal element 180. Structurally, the driver 140 is coupled to the memory 120, the backlight element 160 and the liquid crystal element 180. In operation, the backlight element 160 is used to output backlight. The liquid crystal element 180 is used to control the liquid crystal molecules to output images. The driver 140 is used to control the backlight element 160 and the liquid crystal element 180 to display according to the data signal and the scanning signal. The memory 120 is used to store data.

Please refer to Figure 2A. Figure 2A is based on this disclosure A sub-embodiment shows a schematic diagram of another display device 100. As shown in FIG. 2A, the backlight element 160 includes a plurality of backlight areas, such as the backlight areas Z11 to ZMN shown in the figure. In some embodiments, the number of backlight regions included in the backlight element 160 is M times N, where M and N are any positive integers greater than 1. Structurally, the backlight element 160 is coupled to the driver 140. Specifically, the driver 140 is coupled to the backlight element 160 through a plurality of data lines D1~Dm and a plurality of scan lines G1~Gn.

In operation, the driver 140 is used to output a plurality of data signals to the backlight element 160 through the data lines D1~Dm, and is used to output a plurality of scan signals to the backlight element 160 through the scan lines G1~Gn. The backlight element 160 is used to drive each backlight zone Z11~ZMN to output backlight according to the data signal and the scanning signal.

In some embodiments, the driver 140 may include various processing circuits, a micro controller, a central driver, a microprocessor, a digital signal processor (DSP), and an application specific integrated circuit (application specific integrated circuit) Circuit, ASIC), Complex Programmable Logic Device (CPLD), Field-programmable gate array (FPGA) or logic circuit are implemented in various ways and are not intended to limit this case.

Please refer to Figure 2B. FIG. 2B is a schematic diagram illustrating a backlight zone Z0 according to some embodiments of the present disclosure. Any one of the backlight regions Z11 to ZMN shown in FIG. 1 can be realized by the backlight region Z0 in FIG. 2B. As shown in FIG. 2B, the backlight zone Z0 corresponds to a plurality of pixels Px. specific In particular, in the vertical projection direction, the area ratio of the pixel Px and the backlight area Z0 will be matched according to the pixel density unit (Pixel Per Inch, PPI) and brightness requirements. For example, the area ratio of the pixel Px and the backlight area Z0 is about 5% to 50%.

In addition, as shown in FIG. 2B, the backlight area Z0 includes three light emitting elements Rled, Gled, and Bled of red, green, and blue. In some embodiments, the light-emitting elements Rled, Gled, and Bled can be implemented according to micro light emitting diodes (Micro Light Emitting Diode, mLED), but this case is not limited to this.

Please refer to Figure 3. FIG. 3 is a schematic diagram showing a backlight element 160 displaying a frame according to some embodiments of the present disclosure. It is worth noting that the number or size of the backlight regions included in the backlight element 160 can be adjusted according to actual needs, and is not intended to limit this case. For ease of description, the backlight element 160 includes 8 columns and 8 rows and a total of 64 backlight regions will be described as an example.

As shown in FIG. 3, during T1, the backlight area c1 in the first column of the backlight element 160 displays and emits light in the color R. During T2, the backlight area c2 of the second column of the backlight element 160 displays and emits light in the color G. During T3, the backlight area c3 in the third column of the backlight element 160 displays and emits light in the color B. By analogy, during the TN, the backlight area cN of the last column in the backlight element 160 displays and emits light in a corresponding one of the colors R, G, and B. For example, as shown in the embodiment of FIG. 3, since the backlight element 160 includes a total of 8 columns, N is 8. In other words, during T8, the backlight area c8 in the eighth column of the backlight element 160 displays and emits light in the color G.

In this way, by the first area (such as the backlight area c1, c4, c7) Display the first color (such as red R), the second area (such as backlight areas c2, c5, c8) display the second color (such as green G), and the third area (such as backlight areas c3, c6) display the third color (Such as blue B), constitutes the first color field (as shown by Fd1 in Figure 3).

Next, during TN+1, the backlight area c1 in the first column of the backlight element 160 is displayed and emits light in the color G. During TN+2, the backlight area c2 in the second column of the backlight element 160 displays and emits light in the color B. During TN+3, the backlight area c3 in the third column of the backlight element 160 displays and emits light in the color R. By analogy, during the T2N period, the backlight area cN of the last column in the backlight element 160 displays and emits light in a corresponding one of the colors R, G, and B. For example, as shown in the embodiment of FIG. 3, since the backlight element 160 includes a total of 8 columns, 2N is 16. In other words, during T16, the backlight area c8 in the eighth column of the backlight element 160 displays and emits light in the color B.

In this way, the first area (such as the backlight areas c1, c4, c7) displays the second color (such as green G), and the second area (such as the backlight areas c2, c5, c8) displays the third color (such as blue B), the third area (such as the backlight areas c3, c6) displays the first color (such as red R), which constitutes the second color field (as shown by Fd2 in Figure 3).

Next, during T2N+1, the backlight area c1 of the first column in the backlight element 160 displays and emits light in the color B. During T2N+2, the backlight area c2 in the second column of the backlight element 160 displays and emits light in the color R. During T2N+3, the backlight area c3 in the third column of the backlight element 160 displays and emits light in the color G. By analogy, during T3N, the backlight area cN of the last column in the backlight element 160 is displayed and displayed in the corresponding one of the color R, color G, and color B. Light. For example, as shown in the embodiment of FIG. 3, since the backlight element 160 includes a total of 8 columns, 3N is 24. In other words, during T24, the backlight area c8 in the eighth column of the backlight element 160 displays and emits light in the color R.

In this way, the first area (such as the backlight areas c1, c4, c7) displays the third color (such as blue B), and the second area (such as the backlight areas c2, c5, c8) displays the first color (such as red R), the third area (such as the backlight areas c3, c6) displays the second color (such as green G), which constitutes the third color field (as shown by Fd3 in Figure 3).

Therefore, during the period from T1 to T3N, the first area, the second area, and the third area sequentially display the corresponding first color, second color, or third color to form the first color field Fd1, the second color The field Fd2 and the third color field Fd3, and the first frame is formed by the first color field Fd1, the second color field Fd2, and the third color field Fd3.

In other words, each frame to be output is split into three color fields, and the backlight area at the same position in each color field Fd1, Fd2, Fd3 contains three different colors R, G, B ( For example, the backlight area r2 displays the colors G, B, and R in the color fields Fd1, Fd2, and Fd3, respectively. Since the color field update frequency of the color fields Fd1, Fd2, and Fd3 is higher than the frequency that the human eye can perceive, the human eye will have visual persistence. Therefore, the first color field Fd1, the second color field Fd2, and the third color field Fd3 It is possible to constitute the first frame picture Fa1. In addition, the color sequence displayed in different backlight areas is different (for example: the backlight area r3 displays colors B, R, and G in the color fields Fd1, Fd2, and Fd3, respectively, which is different from the order in which the backlight areas r2 display colors G, B, and R) Therefore, the periodicity of occurrence of color separation (Color Breakup, CBU) can be destroyed to reduce the occurrence of color separation.

Please refer to Figure 4 and Figure 5. FIG. 4 is a flowchart illustrating a driving method 400 according to some embodiments of the present disclosure. FIG. 5 is a schematic diagram illustrating a backlight element 160 displaying multiple frames according to some embodiments of the present disclosure. The following driving method 400 is described in conjunction with the embodiments shown in FIGS. 1 to 10, but it is not limited to this. Anyone who is familiar with this skill can make various changes without departing from the spirit and scope of this case. With retouch. As shown in FIG. 4, the driving method 400 includes operations S420, S440, and S460.

First, in operation S420, the first color field Fd1, the second color field Fd2, and the third color field Fd3 are sequentially displayed to constitute the first frame picture Fa1.

For example, as shown in FIG. 4, the first frame picture Fa1 includes a color field Fd1, a color field Fd2, and a color field Fd3. Furthermore, during the period P1 (corresponding to the period T1 to TN in FIG. 3), the backlight element 160 displays the color field Fd1. Next, during the period P2 (corresponding to the period TN+1 to T2N in FIG. 3), the backlight element 160 displays the color field Fd2. Next, during the period P3 (equivalent to the period T2N+1 to T3N in FIG. 3), the backlight element 160 displays the color field Fd3. In other words, after the period P1 to P3 (equivalent to the period T1 to T3N in FIG. 3), the backlight element 160 sequentially displays the color field Fd1, the color field Fd2, and the color field Fd3 to form the first frame picture Fa1.

Next, in operation S440, the second color field Fd2, the third color field Fd3, and the first color field Fd1 are sequentially displayed to constitute the second frame picture Fa2.

For example, as shown in FIG. 4, the second frame picture Fa2 also includes a color field Fd1, a color field Fd2, and a color field Fd3. However, further, unlike the periods P1, P2, and P3, during the periods P4, P5, and P6, the backlight element 160 sequentially displays the color field Fd2, the color field Fd3, and the color field Fd1. In other words, after the period from P4 to P6, the color field Fd2, the color field Fd3, and the color field Fd1 sequentially displayed by the backlight element 160 constitute the first Two frames Fa2.

Next, in operation S460, the third color field Fd3, the first color field Fd1, and the second color field Fd2 are sequentially displayed to constitute the third frame picture Fa3.

For example, as shown in FIG. 4, the third frame Fa3 also includes a color field Fd1, a color field Fd2, and a color field Fd3. However, unlike the periods P1, P2, and P3, or the periods P4, P5, and P6, during the periods P7, P8, and P9, the backlight element 160 sequentially displays the color field Fd3, the color field Fd1, and the color field Fd2. In other words, during the period from P7 to P9, the color field Fd3, the color field Fd1, and the color field Fd2 sequentially displayed by the backlight element 160 constitute the third frame picture Fa3.

And so on, after operation S460, it returns to operation S420 again. In other words, a cycle contains a total of three frames (such as Fa1, Fa2, Fa3) or nine color field sequences (such as Fd1, Fd2, Fd3, Fd2, Fd3, Fd1, Fd3, Fd1, Fd2). That is to say, the next frame picture will be displayed in the same color field order as the first frame picture Fa1 (such as Fd1, Fd2, Fd3).

Therefore, during the period from P1 to P9, the sequence of displaying the first color field Fd1, the second color field Fd2, and the third color field Fd3 in each frame by the backlight element 160 is alternately changed, similar to changing the display in different backlight areas The color sequence can also disrupt the periodicity of color separation. In this way, the phenomenon of color separation can be reduced without increasing the color field update frequency (field-rate).

To further explain the operation between the backlight element 160 and the liquid crystal element 180, please refer to FIG. 6. As shown in FIG. 6, the upper part is a timing diagram LCD for displaying by the liquid crystal element 180, and the lower part is a timing diagram LED for displaying by the backlight element 160. Among them, the horizontal axis represents time, and the vertical axis represents backlight areas in different areas. For the convenience of explanation, the embodiment in Figure 6 will cooperate In FIGS. 3 and 5, the backlight element 160 includes eight columns of backlight regions c1 to c8 as an example. It is worth noting that the backlight area can also be divided into other areas in other ways, which will be described in subsequent paragraphs. In addition, the liquid crystal regions cy1~cy8 in the LCD of the timing diagram divide the liquid crystal element 180 into 8-column liquid crystal regions cy1~cy8 according to the 8-column backlight regions c1~c8 included in the backlight element 160, which is also an illustrative description. , Not to limit this case.

In some embodiments, as shown in the upper part of FIG. 6, the liquid crystal area cy1 in the first column of the liquid crystal element 180 starts to rotate according to the driving signal ON during the period t1 until the end of the period t9. The liquid crystal area cy2 in the second column starts to rotate during the period t2 according to the drive signal ON until the end of the period t10. By analogy, the liquid crystal areas cy3~cy8 in the third column to the eighth column start to rotate according to the corresponding driving signal ON during t3~t8, respectively, until the end of t11~t16 respectively.

In addition, the P0 period shown in FIG. 6 is the length of time until the liquid crystal element 180 receives the corresponding driving signal until the liquid crystal molecules determine to rotate to the positioning. In other words, during the P0 period (that is, the period from t1 to t6), the backlight element 160 has not yet started to emit light. After the period from t1 to t6, the liquid crystal area c1 in the first column of the backlight element 160 displays and emits the color R during the period from t7 to t8 according to the data signal and the scan signal. The liquid crystal area c2 in the second column displays and emits light in the color G from t8 to t9 according to the data signal and the scanning signal. The liquid crystal area c3 in the third column displays and emits light in the color B from t9 to t10 according to the data signal and the scanning signal. And so on, the liquid crystal areas c4~c8 in the fourth column to the eighth column according to the data signal and the scanning signal are respectively t10~t11, t11~t12, t12~t13......t14~t15 with the corresponding colors R, G, B performs display light emission. For details, please refer to section 3 above The description of Figures to Figure 5 will not be repeated here.

In other words, after it is determined that the first column liquid crystal area cy1 rotates to the position after t1~t6, the first column liquid crystal area cy1 maintains the position during t7~t8, so that the first column backlight area c1 can output and display with the color R. Similarly, after it is determined that the second column liquid crystal area cy2 rotates to the position during t2~t7, the second column liquid crystal area cy2 maintains the position during t8~t9, so that the second column backlight area c2 can output and display in color G. After it is determined that the third column liquid crystal area cy3 rotates to the position during t3~t8, the third column liquid crystal area cy3 maintains the position during t9~t10, so that the third column backlight area c3 can output and display in color B. By analogy, after determining that the eighth column liquid crystal area cy8 rotates to position during t8~t13, the eighth column liquid crystal area cy8 maintains positioning during t14~t15, so that the eighth column backlight area c8 can output and display in color G.

In this way, during the period from t7 to t15, the backlight element 160 sequentially drives each column of the backlight regions c1 to c8 to emit light to form the first color field Fd1, and sequentially drives the liquid crystal corresponding to each column through the liquid crystal element 180 The areas cy1 to cy8 enable the output of video content displaying the first color field. Then, during t16, the backlight element 160 controls all the backlight areas c1 to c8 not to emit light. In other words, a completely black screen is included between the backlight element 160 outputting the first color field Fd1 and the second color field Fd2.

Since the operations of the liquid crystal element 180 sequentially controlling the liquid crystal regions in each column to rotate are similar, they will not be described in detail, and only the operation of the backlight element 160 will be described. As shown in FIG. 6, then, during the period from t17 to t25, similar to the period from t7 to t15, the backlight elements 160 sequentially drive each column of the backlight regions c1 to c8 to emit light to form the second color field Fd2. During t26, similar During t16, all the backlight areas c1 to c8 do not emit light. After that, during the period from t27 to 25, the backlight element 160 sequentially drives each column of the backlight regions c1 to c8 to emit light to form the third color field Fd3. During t36, all the backlight areas c1 to c8 do not emit light. In other words, a completely black screen may be included between the output color field Fd1, the color field Fd2, and the color field Fd3 of the backlight element 160.

In this way, by driving each backlight area of the backlight element 160 to sequentially display the corresponding color R, color G, or color B, together with the corresponding action of the liquid crystal element 180, the first display can be output at P1, P2, and P3, respectively. Image content of the color field Fd1, the second color field Fd2, and the third color field Fd3. The first frame Fa1 can be formed by the first color field Fd1, the second color field Fd2, and the third color field Fd3.

Regarding the operation of the backlight element in P4 after P3, as well as the detailed descriptions of the second frame Fa2 and the third frame Fa3, those with ordinary knowledge in the art can know from FIG. 3, FIG. 4 and the above description Therefore, it will not be repeated here.

It is worth noting that the unit length and number of the period t1~t37 and the ratio to P1 are based on the number of backlight areas included in the backlight element 160, the time required for the liquid crystal molecules to rotate, the length of time the backlight emits light, and the black screen insertion time (such as (Figure 6 shows PB) depending on the length. Figure 6 is for illustrative purposes only, and is not intended to limit the case. For example, the update frequency of the color fields Fd1, Fd2, and Fd3 may be 180 Hz (that is, the unit length of the period t1 is approximately 5.55 microseconds). However, this value is only an illustrative description, and is not intended to limit the case.

Please refer to Figure 7. FIG. 7 is a schematic diagram illustrating another display device 100 according to other embodiments of the present disclosure. Implementation in Figure 7 In the example, components similar to those in FIG. 2A are indicated by the same component symbols, and their operations have been described in the previous paragraphs, and will not be repeated here. Compared with FIG. 2A, in this embodiment, the display device 100 further includes multiplexers M1 to Mx. Structurally, the driver 140 is coupled to the backlight element 160 through multiplexers M1~Mx.

Specifically, the driver 140 is coupled to the multiplexers M1 to Mx through the signal lines L1 to Lx, respectively. The multiplexers M1~Mx are respectively coupled to the backlight element 160 through a plurality of data lines D1~Dk, Dk+1~D2k...Dxk. For example, the driver 140 is connected to the multiplexer M1 through the signal line L1. The multiplexer M1 can be a pair of k multiplexers, that is, the signal can be output to the k data lines D1 to Dk through the multiplexer M1. In this way, the number of pins required by the driver 140 can be reduced by the multiplexers M1~Mx, so as to reduce the cost and/or increase the feasibility of the driver 140 integrating different functions.

Please refer to Figure 8A. FIG. 8A is a schematic diagram illustrating another display device 100 according to other embodiments of the present disclosure. In the embodiment of FIG. 8A, elements similar to those of FIG. 2A are indicated by the same element symbols, and their operations have been described in the previous paragraphs, and will not be repeated here. Compared with FIG. 2A, in this embodiment, the display device 100 includes a driver 140a and a driver 140b, and the backlight element 160 includes a first part A11~AMN and a second part B11~BMN. Structurally, the drivers 140a and 140b are respectively coupled to the first part A11~AMN and the second part B11~BMN of the backlight element 160. Specifically, the driver 140a is coupled to one side (the first part A11~AMN) of the backlight element 160 through a set of data lines D1~Dm, and the driver 140b is coupled to another side of the backlight element 160 through another set of data lines D1~Dm One side (Part II B11~BMN).

In operation, the driver 140a is used to drive each backlight area of the first part of the backlight element 160 from the first side of the backlight element 160 (such as: the left side in FIG. 8A) to the second side (such as: right side in the FIG. 8A). A11~AMN emit light. The driver 140b is used to drive each backlight area B11 of the second part of the backlight element 160 from the second side of the backlight element 160 (eg, the right side in FIG. 8A) to the first side (eg: left side in the FIG. 8A). BMN emits light.

For example, the driver 140a drives the first part of the first column backlight area A11~ZM1 through the first set of data lines D1~Dm and the scan line G1 to emit light, and at the same time the driver 140b passes through the second set of data lines D1~Dm and the scan line G2n The backlight area B11~BM1 in the last column of the second part is driven to emit light. Next, the driver 140a drives the first part of the second column backlight area Z12~ZM2 through the data lines D1~Dm and the scanning line G2 to emit light, and at the same time the driver 140b drives the second through the second set of data lines D1~Dm and the scanning line G2n-1 Part of the penultimate column backlight areas B12~BM2 emit light. And so on, until the driver 140a drives the backlight area Z1N~ZMN of the last column of the first part through the data lines D1~Dm and the scanning line G1 to emit light, and at the same time the driver 140b passes the second group of data lines D1~Dm and the scanning line Gn+1 The backlight area B1N~BMN in the first column of the second part is driven to emit light.

Specifically, please refer to Figure 8B. FIG. 8B is a timing diagram showing LCD and LED for displaying by a liquid crystal element 180 and a backlight element 160 according to some embodiments of FIG. 8A. In the embodiment of FIG. 8B, elements similar to those of FIG. 6 are indicated by the same element symbols, and their operations have been described in the previous paragraphs, and will not be repeated here. Compared with Figure 6, in this embodiment, since The two drivers 140a, 140b simultaneously drive the backlight regions of the first part c1 to c4 and the second part c5 to c8 in the backlight element 160 to emit light, therefore, the total lighting time required for each color field Fd1, Fd2, Fd3 is shorter . For example, the total light emission time of one color field shown in FIG. 8B is t7 to t11, which is about half of the total light emission time t7 to t15 in the embodiment of FIG. 6.

In other words, in some embodiments, the time PB for inserting a black picture between each color field Fd1, Fd2, Fd3 can be extended. As shown in FIG. 8B, the black insertion time PB is t12 to t16, which is about five times the black insertion time PB in the embodiment of FIG. 6. In this way, by bilaterally driving half of the pictures separately, the display speed of completing a frame of pictures can be accelerated, thereby increasing the time of all black pictures when not emitting light, and achieving a better color separation without increasing the color field update rate. . It is worth noting that the unit length, number, and ratio to P1 or PB in the period t1 to t37 in Figure 8B are only illustrative illustrations. Those with ordinary knowledge in the art can adjust the design according to actual needs, not to limit this case.

Regarding the backlight area 160 being divided into different areas in other ways, please refer to FIGS. 9A and 9B. FIG. 9A is a schematic diagram illustrating a backlight element 160 displaying a color field according to some embodiments of the present disclosure. FIG. 9B is a schematic diagram illustrating a backlight element 160 displaying three color fields according to some embodiments of the present disclosure. As shown in FIG. 9A, in some embodiments, the 64 backlight regions in the backlight element 160 are divided into a first column r1, a second column r2, a third column r3, and the last column rN. In other words, as shown in FIG. 9B, taking the backlight element 160 including 8 columns of backlight regions as an example, in the first color field Fd1, the first region displaying the color R includes the backlight regions r1, r4, r7, and displaying the first color G The second area includes backlight areas r2, r5, r8, and the third area that displays color B includes backlight areas r3, r6.

Similarly, in the second color field Fd2, the first area (r1, r4, r7) displays the color G, the second area (r2, r5, r8) displays the third color B, and the third area (r3, r6) displays Color R. In the third color field Fd3, the first area (r1, r4, r7) displays the color B, the second area (r2, r5, r8) displays the color R, and the third area (r3, r6) displays the color G.

In addition, please refer to Figures 10A and 10B. FIG. 10A is a schematic diagram showing another backlight element 160 displaying a color field according to some embodiments of the present disclosure. FIG. 10B is a schematic diagram illustrating another backlight element 160 displaying three color fields according to some embodiments of the present disclosure. As shown in FIG. 10A, in some embodiments, the 64 backlight regions in the backlight element 160 are divided into a first oblique row d1, a second oblique row d2, a third oblique row d3, and the last oblique row dN. In other words, as shown in FIG. 10B, taking the backlight element 160 including 15 oblique rows of backlight regions as an example, in the first color field Fd1, the first region displaying the color R includes d1, d4, d7, d10, and d13. The second area of color G includes d2, d5, d8, d11, and d14, and the third area of display color B includes d3, d6, d9, d12, and d15.

Similarly, in the second color field Fd2, the first area (d1, d4, d7, d10, d13) displays color G, the second area (d2, d5, d8, d11, d14) displays color B, and the third area (d3, d6, d9, d12, d15) display color R. In the third color field Fd3, the first area (d1, d4, d7, d10, d13) displays color B, the second area (d2, d5, d8, d11, d14) displays color R, and the third area (d3, d6, d9, d12, d15) display color G.

It is worth noting that the above division method of the backlight area is for illustrative purposes only, and those skilled in the art can adjust the division method according to actual needs. For example, each adjacent two or more columns in the backlight element 160 can be divided into the same One area.

In addition, in other partial embodiments, the driving method 400 of this case may be performed together with local dimming. In other words, the brightness of different backlight regions that display the same of color R, color G, or color B may not be completely the same. For example, when the backlight element 160 displays the first color field Fd1, the backlight regions Z11 to Z1N in the first region r1 that also displays the color R may have different levels of gray levels.

Although the disclosed method is shown and described herein as a series of steps or events, it should be understood that the order of the steps or events shown should not be interpreted as limiting. For example, some steps may occur in a different order and/or simultaneously with other steps or events other than those shown and/or described herein. In addition, not all of the steps shown here are necessary to implement one or more aspects or embodiments described herein. In addition, one or more steps herein may also be performed in one or more separate steps and/or stages.

It should be noted that, in the case of no conflict, the various drawings, embodiments, and features and circuits in the present disclosure may be combined with each other. The circuits shown in the drawings are for illustrative purposes only, and are simplified to make the description concise and easy to understand, and are not intended to limit the case. In addition, the various devices, units, and components in the foregoing embodiments may be implemented by various types of digital or analog circuits, or may be implemented by different integrated circuit chips, or integrated into a single chip. The above is only an example, and the disclosure is not limited thereto.

In summary, in this case, the color field Fd1 and the color field Fd2 of each frame are alternately replaced by the backlight element 160 by applying the above embodiments. The sequence of the color field Fd3, and the sequence of alternately replacing the display color R, color G, and color B in each backlight area can destroy the periodicity of color separation. Therefore, the phenomenon of color separation can be reduced without increasing the color field update frequency.

Although this disclosure has been disclosed as above by way of implementation, it is not intended to limit this disclosure. Those with ordinary knowledge in the technical field can make various changes and modifications within the spirit and scope of this disclosure, so this The scope of protection of the disclosure shall be deemed as defined by the scope of the attached patent application.

400‧‧‧Drive method

S420, S440, S460‧‧‧Operation

Claims (8)

A display device includes: a backlight element including a plurality of backlight areas, the backlight areas including a first area, a second area and a third area; and a first driver coupled to the backlight element, the first A driver is used to perform the following operations: drive the first area to display a first color, the second area to display a second color, and the third area to display a third color to form a first color field; drive the first color field An area displays the second color, the second area displays the third color, and the third area displays the first color to form a second color field; the first area is driven to display the third color, the second The area displays the first color, and the third area displays the second color to form a third color field; the backlight element is driven to sequentially display the first color field, the second color field, and the third color field to Forming a first frame picture; driving the backlight element to sequentially display the second color field, the third color field and the first color field to form a second frame picture; and driving the backlight element to sequentially display the third frame picture The color field, the first color field, and the second color field form a third frame. The display device according to claim 1, wherein the first area is adjacent to the second area and the third area, and the second area is adjacent to the first area An area and the third area, the third area is adjacent to the second area and the first area. The display device according to claim 2, wherein the first area, the second area, and the third area are respectively backlight areas in different rows of the backlight areas. The display device according to claim 1, further comprising: a multiplexer, coupled between the first driver and the backlight element, for receiving a plurality of data signals from the first driver through a signal line, and The data signals are output to the backlight element through a plurality of data lines. The display device according to claim 1, further comprising a second driver, wherein the first driver is coupled to a first side of the backlight element, and the second driver is coupled to a second side of the backlight element, The first driver is used to drive the backlight element from the first side to the second side, and the second driver is used to drive the backlight element from the second side to the first side. A driving method includes: displaying a first color, a second color and a third color from a first area, a second area and a third area to form a first color field; The area, the second area and the third area respectively display the second color, the third color and the first color to form a second color field; the first area, the second area and the third area The area shows the first Three colors, the first color and the second color to form a third color field; the first color field, the second color field and the third color field are displayed in sequence to form a first frame picture; Display the second color field, the third color field and the first color field in sequence to form a second frame picture; display the third color field, the first color field and the second color field in sequence to form a A third frame picture; and repeatedly displaying the first frame picture, the second frame picture and the third frame picture in sequence to form an output image. The driving method according to claim 6, wherein the first area, the second area, and the third area each include a plurality of backlight areas that display the same of the first color, the second color, or the third color The brightness of these backlight areas is different. The driving method according to claim 6, wherein one or more completely black frames are included between the first color field, the second color field, and the third color field.

Images