JPH01229296A - Display device - Google Patents

Abstract

PURPOSE:To perform a monochromatic display without any brightness difference by driving two picture elements which displays the same color among picture elements in one block by a 1st driver and driving two picture elements which display the remaining two colors by a 2nd driver. CONSTITUTION:In each row, one picture element 11 which displays red, one picture element 12 which displays blue, and two picture elements 13 which display green are blocked in one in the order of red, green, blue, and green, and this block is arranged repeatedly in the row direction to arrange respective elements 11-13. Further, picture elements of upper and lower rows are so arrayed that one block shift in position to right and left alternately by one pitch of picture elements. Then when a monochromatic display of red is made, picture elements 11 of red are all driven by a segment driver 14a and when a monochromatic display of blue is made, picture elements are driven similarly. When a monochromatic display of green is made, picture elements 13 of green are all driven by a segment driver 14b. Thus, a monochromatic display which generates no brightness difference is made.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to display devices used in color television receivers, office automation equipment, and the like.

BACKGROUND ART FIGS. 5(a), (b), and (c) are schematic diagrams showing each pattern of a matrix arrangement of picture elements of a display panel in a conventional color liquid crystal display device. Figure (a) is what is called a delta type arrangement, and one block consists of three pixels arranged in a fixed order: picture element 1 that displays red, picture element 2 that displays blue, and picture element 3 that displays green. By arranging these blocks repeatedly in the row direction, picture elements for one row of the display screen are arranged, and in the next adjacent row, picture elements 1 to 1 are shifted by 1/2 pitch of one block from the previous row. 3 are arranged so that three picture elements 1 to 3, each displaying a different color, form a delta-like positional relationship between adjacent rows. ~
This is called a live type array, and the picture elements 1 to 3 are arranged so that the positions of the blocks described above are the same in all rows. Figure 5(c) is a so-called diagonal arrangement, and is a picture in which the positions of the blocks described above are shifted by one pixel pitch between adjacent rows to display the same color as a whole. The elements are arranged diagonally.

FIG. 6 is a schematic diagram showing a connection configuration between a display panel in a conventional color liquid crystal display device and a segment driver that drives picture elements of this display panel. In the display panel 4, the same number of data signal supply lines 5 as the number of picture elements for one row are wired in the column direction of the picture elements, and the data signal supply lines 5 in odd-numbered columns are connected to the first... The data supply lines 5 of the even-numbered columns are connected to the second segment driver 6b.

FIG. 7 is a schematic diagram showing a connection configuration between each of the picture elements 1 to 3 in one row in the display panel 4 shown in FIG. 6 and the segment drivers 6a to 6b. Picture elements 1 to 3 in one row are three picture elements 1 to 3 that display different colors as described above.
3 are arranged in a certain order repeatedly in the row direction, so that, for example, picture elements 1 and 2 that display red and blue in one block display green on the first segment driver 6a. The second segment driver ('
)b respectively via the data signal supply line 5, then in the next block conversely, the picture elements 1 and 2 displaying red and blue are connected to the second segment driver 6t), and the green The picture element 3 that displays
It is connected to the. Therefore, between adjacent blocks in one row, pixels displaying the same color are connected to different segment drivers, and pixels displaying the same color that are connected to the same segment driver are connected to the same segment driver in one row. Inside, six picture elements will appear repeatedly.

In the color liquid crystal display device described above, the picture elements of each row of the display panel 4 are driven along the sides.

The video signal for one row of the display panel 4, that is, the red, blue, and green color signals are sequentially sent to the segment driver 6a.

6b, these segment drivers 6a
, 6b both sample the color signal at a predetermined period,
After completing sampling for one row, a driving voltage is applied to the picture element corresponding to the color signal through the data signal supply line 5. As a result, each color corresponding to the color signal is displayed on one line of the display panel 4.

The above operations are performed sequentially over each scanning line, and one screen is displayed in color.

In the above operation, the driving of one row of picture elements is shared between the two segment drivers 6a and 6b, so the sampling frequency at which each segment driver 6a and 6b samples the color signal is a single frequency. This means that only half the amount of sampling required when using a segment driver is sufficient, and the linearity of the input/output characteristics of the smoothed segment drivers 6a and 6b is improved.

Problems to be Solved by the Invention However, in the conventional color liquid crystal display device described above, 1.
There are picture elements that display the same color every three picture elements in a row, and the picture element driven by the first segment driver 6a and the picture element driven by the second segment driver 6a). Since the arrangement and connection configuration is such that the elements are arranged alternately, when a single color is displayed on the entire display panel 4, the display screen is as shown in Fig. 8<a), (
7), as shown in (C).

FIG. 8(a) shows a display screen where the arrangement of picture elements on the display panel 4 is a delta type, and a picture element 7a with diagonal lines in the figure is shown.
indicates a picture element driven by the first segment driver 6a, and a white picture element 7b indicates a picture element that displays the same color and is driven by the second segment driver 6b. . In the figure, segment drivers 6a, 6
Picture elements that are not driven by b are omitted. 8th
FIG. 8(b) and FIG. 8(c) show cases where the pixel arrangement is striped type and diagonal type, respectively, and similarly, the diagonally shaded pixel 7a is driven by the first segment driver 6a. The white picture elements 7b indicate those driven by the second segment driver 6b.

As is clear from FIGS. 8<a) to (C), when monochrome display is performed, the group of picture elements 7a driven by the first segment driver 6a and the group of picture elements 7a driven by the second segment driver 61:) The group of picture elements 7b divides the display screen into vertical stripes. For this reason, two segment drivers 6a,
If there is even a slight difference in the input/output characteristics of pixel 7a,
, 7b, and a vertical striped pattern is observed on the display screen, which poses a practical problem. Therefore, the conventional color liquid crystal display device uses two segment drivers 6a.

It is necessary to align the input/output characteristics of the 6b with high precision, which requires strict inspection of the segment driver characteristics, which poses a problem in that it becomes an obstacle to improving the yield of segment drivers.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a display device that can perform monochromatic display without causing any brightness difference even if there is some variation in the input/output characteristics of a segment driver.

Means for Solving the Problems The present invention provides a first method for selecting an odd-numbered picture element or an even-numbered picture element among a group of picture elements in each row of a display screen in which a plurality of picture elements are arranged in a matrix. Driven by a driver,
In a display device in which the picture elements located on the other side are driven by a second driver, two different colors among red, blue, and green (red and blue, red and green,
One pixel for each displaying one of the combinations of blue and green) and one remaining color (green if the two colors are red and blue, blue if the two colors are red and green, blue if blue and green); A total of four picture elements (two picture elements displaying red) are arranged in a line in a certain order to form one block, and the picture elements in each row of the display screen are arranged repeatedly so that the whole block is in one line. Among the picture elements of one block, two picture elements displaying the same color are driven by a first driver, and the remaining two colors are displayed.
This is a display device characterized in that two picture elements are driven by a second driver.

Function According to the present invention, picture elements displaying the same color are driven by a common driver, so even if there is some variation in input/output characteristics between the two drivers, the display screen will not change in the case of monochromatic display. There is no difference in brightness.

Embodiment FIG. 1 is a schematic diagram showing an arrangement pattern of picture elements in a portion of a display panel of a color liquid crystal display device which is an embodiment of the display device of the present invention. In the figure, in each row, one picture element 11 that displays red, one picture element 12 that displays blue, and two picture elements 13 that display green are arranged in the order of red, green, blue, and green. Each picture element 11 to 13 is arranged by forming one block and repeatedly arranging this block in the row direction. Also, between certain adjacent rows above and below, for example, the position of one block in the lower row is shifted to the left by one pixel pitch with respect to the position of one block in the upper row, and further, in the row below The position of one block is shifted to the right by one picture element pitch with respect to the row above, and the position of one block is alternately shifted left and right by one picture element pitch in each row, so that the same The color picture elements are arranged so that they are not continuous from top to bottom.

FIG. 2 shows each picture element 11 to 13 on the display panel of the color liquid crystal display device of this embodiment, and these picture elements 11 to 1.
FIG. 3 is a schematic diagram showing a part of the connection configuration with segment drivers 14a and 14b that drive 3. In the figure, each 1
Picture elements 11 to 13 in the row are four picture elements 1 as described above.
It is an array in which blocks 1 to 13 are arranged in the order of red, green, blue, green repeatedly in the row direction, and between the top and bottom rows, the position of one block is changed by one pitch of the picture element, left and right for each row. Since the pixels are alternately shifted, between rows of adjacent picture elements, picture elements of the same color are arranged alternately in the column direction. Data signal supply lines 15 are connected between these columns.
For example, the odd-numbered data signal supply lines 15 from the left side of FIG. 2 are connected to the first segment driver 14a, and the even-numbered data signal supply lines 15 are connected to the second segment driver 141). There is. Further, among the odd-numbered data signal supply lines 15, those corresponding to the rows where red and green picture elements are arranged are connected to the red picture element 11 via a switch element (not shown), The lines corresponding to the rows of lines lined up are also connected to the blue picture elements 12 via switch elements, while the even-numbered data signal supply lines 1
5 is connected to green picture elements 13 arranged between corresponding columns via switch elements.

FIG. 3 is a circuit diagram showing a specific example of the connection configuration shown in FIG. 2, in which a thin film transistor 16 is used as the above-mentioned switch element. Picture elements 11 to 13 for one line
The gates of the thin film transistors 16 corresponding to each row are connected to a common scanning line 17, respectively.

FIG. 4 shows segment drivers 14a, 1 shown in FIG.
4b is a block diagram without showing an example of a specific configuration of the input video signal. one shift register that generates pulses that control the operation of the sample circuit 18;
The video signal for one row of the display panel sampled by the sample circuit 18 V1. (1) The analog memory 20 is configured to temporarily hold the data 2 and then output it to the corresponding data signal supply lines 15 all at once as a data signal. As the video signals V, V2, the segment driver 14a connected to the odd-numbered data signal supply line 15 includes:
A red color signal and a blue color signal are inputted, and a common green color signal is inputted to the segment driver 14b connected to the even-numbered data signal supply line 15. The segment driver 14b, which inputs this green color signal as video signals V, V2, connects two video signal lines into one in the circuit configuration shown in FIG. 4, and inputs the green color signal to this. Therefore, two segment drivers 14a
, 14t+, there is no need to assemble separate circuits. In addition,
The display color of each picture element 11 to 13 is red on the picture element electrode of each picture element.
It is determined by overlapping color filters of either blue or green.

Next, the operation of the color liquid crystal display device described above will be explained.

Prior to driving one row of the display panel, scanning line 1 of that row is
A scanning voltage is applied to 7. As a result, a scanning voltage is applied to the gate of each thin film transistor 16 in that row, and each thin film transistor 16 is turned on. Next, when a red color signal and a blue color signal are sequentially input to the segment driver 14a and a green color signal is input to the segment driver 14b as video signals for that row, each segment driver 14a, 14b inputs a shift register 1. The sampling circuit 18 performs a sampling operation under the control of pulses that are sequentially output from the data signal supply line 15 in synchronization with the clock. For example, in FIG. 3, if the video signal when the pulse selecting the first data signal supply line 5 from the left is output from the segment driver 14a is a red color signal, the sample circuit 18 The color signal is sampled, and the signal voltage is held in the analog memory 20 until the sampling operation for one row of the display panel is completed, and then output to the data signal supply line 15, and the signal voltage is passed through the thin film transistor 16 to the red picture. The voltage is applied to the picture element 11, and the picture element 11 is driven. Further, when the video signal at the above timing is not a red color signal, the picture element 11 is not driven. In this way, each time the above sampling operation is completed for one line,
By driving the picture elements corresponding to the video signal all at once over one row, color display for one row of the display panel is performed, and by sequentially performing the above operations on all rows, one screen is displayed. The minutes are displayed in color.

In the above operation, for example, when monochromatic red is displayed on the display panel, all the red picture elements 11 are driven by one segment driver 14a. The same applies to the case of blue monochrome display, and in the case of green monochrome display, all the green picture elements 13 are driven by the other segment driver 14b. Therefore, even if there is a slight deviation in the input/output characteristics of the two segment drivers 14, a, and 14b, no difference in brightness will occur on the monochromatic screen.

On the other hand, when picture elements of different colors are driven at the same time, two segments 1 to 14εt are generated as described above.

]4L), the picture elements 11 and 12 driven by one segment driver 145E and the picture elements driven by the other segment) and lime 141]]3
There is a difference in brightness between pixels of the same color, but this difference is difficult to perceive when compared to the difference in brightness between picture elements of the same color. Furthermore, the difference in brightness between picture elements of different colors is determined by the segment driver 14a.
, 14b can be corrected by adjusting the voltage of each color signal, that is, adjusting the color balance. Therefore, even if there is a certain degree of deviation in the input/output characteristics of the two segment drivers 14a, 141:+, this does not substantially pose a problem.

In this example, red and blue picture elements 1],
Compared to 12, the number of green picture elements 13, which have a high visual sensitivity, that is, the difference in stimulus between light emitting and non-emitting times that appeals to the human eye, is doubled, so the resolution perceived by humans is higher than that of conventional devices. Comparatively higher.

Although the second embodiment describes the case of a liquid crystal display device, the same operation can be performed even if it is applied to other display devices such as an electroluminescent display device.

Effects of the Invention As described above, according to the display device of the present invention, since picture elements displaying the same color are driven by a common driver, there is a certain degree of deviation in the input/output characteristics between the two drivers. Even if there is a difference in brightness that would cause a practical problem on the display screen in the case of monochromatic display, inspection of the input/output characteristics of the driver can be simplified, the yield of the driver can be improved, and the cost can be reduced to 1.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the pixel arrangement of a display panel in a color liquid crystal display device which is an embodiment of the present invention, and FIG. 2 shows a part of the connection configuration between each pixel and a segment driver in the embodiment. A schematic diagram, FIG. 3 is a circuit diagram showing a specific example of the connection configuration in FIG. 2, FIG. 4 is a block diagram showing a specific configuration of the segment driver in FIG. 3, and FIGS. 5(a) to (C)
6 is a schematic diagram showing each pattern of the pixel arrangement of a display panel in a conventional color liquid crystal display device, and FIG. 6 is a schematic diagram showing the connection configuration between a display panel and a segment driver in a conventional color liquid crystal display device. , FIG. 7 is a schematic diagram showing the connection configuration between the picture elements in one row of the display panel shown in FIG. 6 and the segment driver, and FIGS. 8(a) to (C) are respectively similar to FIGS. FIG. 6 is an explanatory diagram of a pixel array in which pixels of the same color are extracted and shown for each segment driver from the pixel array in FIG. 11-13...Picture element, 14a, 14b...Segment driver, 15...Data signal supply line, 16...Thin film transistor, 17.Scanning line agent Patent attorney Number of strokes Keiichi 116 = Roroen Rorororo solid Rororo enclosure ■ Rororororo ■ Roro 1st figure] Mouth area 8 figure Ro [ Same circle Roro same trouble mouth] Rorororo trouble [ Same circle Roro Entrance Entrance] Ro Confinement Roro Enclosure " Roro Entrance 1 0 Entrance 1 0 recess] Same as 0 yen] Enshroud [ Kuchi-ku ku Dai Dorororo dorororo doku Roro-ku mouth encirclement recess kuguchi a Roro encirclement Roro garden Roro O encirclement (C) Roro dodo encirclement g ] Loro I Enclosed Bakery Ear Old Ted Old Teder Introduction ■ Figure 5 Roro Lororo Lorororororororororororororo, O Toro Lorororororororororororororororororororororororororororororororororororororororororororororo Sengoguchi Lorororororororororororororororororororororororororororororororororororororororororo Roit Lo Lolo Lo Lo Lo Lo Mother Mouth Mouth Mouth Lo Lo Lo Mouth Mouth Lolo Lo Lo Lo Lo Lo Lo Lo

Claims (1)

[Scope of Claims] A first driver drives a picture element located at either an odd number or an even number among a group of picture elements in each row of a display screen in which a plurality of picture elements are arranged in a matrix, In a display device in which a picture element located on the other side is driven by a second driver, one picture element each displays two different colors among red, blue, and green, and two picture elements display the remaining one color. A total of four picture elements are arranged in a line in a certain order to form one block, and the picture elements in each row of the display screen are arranged by repeatedly arranging this block so that the whole block is in one line, Among the picture elements of one block, two picture elements displaying the same color are driven by the first driver, and the remaining two colors are displayed.
A display device characterized in that one picture element is driven by a second driver.