JPH06100888B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a matrix type color display device.
The present invention relates to a display device in which color signals of primary colors are effectively distributed.

[Conventional technology]

Generally, a matrix-type color display device has two green elements among the three primary colors, one red element and one blue element, and one green, red, and blue element for general use. The number of elements is smaller than that of the ones that are arranged one by one, so that images with similar resolution can be displayed. This is because in a general image, the green component carries most of the information about the brightness, so by increasing the ratio of the number of green elements, the number of all pixel elements is made the same and the resolution is secured. In addition, sufficient performance is secured for color expression by additive color mixing.

[Problems to be solved by the invention]

However, when there is a red or blue monochromatic portion in the image, the number of elements of each color is small, so that it is observed as a set of dots instead of an area, and it has a drawback that it exhibits a phenomenon called dot interference. It was

The present invention has been made to solve such a problem, and in a display device in which the number of red and blue elements is smaller than that of green elements, a display that does not cause dot interference even when a single color of red or blue is displayed. It is an object of the present invention to provide a display device that can be operated by.

[Means for solving problems]

In order to achieve such an object, the present invention is such that when the red or blue element emits light, the green element also emits light at the same time.

[Action]

Even when displaying a single color of red or blue, the green element contributes to image formation.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
(I-1), 11 (i), 11 (i + 1) are the first column drive lines,
12 (i-1), 12 (i), 12 (i + 1) are second column drive lines, and 2 (j-1), 2 (j), 2 (j + 1) are row selection lines. Here, 11 (i), 12 (i-1), 2 (j), etc. indicate the i-th, (i-1), j-th one of each line. In the figure, the symbol 3G marked G is the display element of the green primary color (hereinafter referred to as the green element) arranged at the intersection of the first column drive line and the row selection line, and the symbol 3R marked R is A red primary color display element (hereinafter referred to as a red element) disposed at an intersection of the second column drive line and the row selection line, and a symbol 3B described as B is a second column drive line and a row selection line. It is a blue primary color element (hereinafter referred to as a blue element) disposed at the intersection of and. Although FIG. 1 shows only a part of the elements, the red element 3R and the blue element 3B are alternately arranged for every second column drive line, and the green element 3G is arranged in the first column drive line. It is arranged.

When calling a specific one of these elements 3G, 3R, 3B, 3G (i, j), 3R (i + 1, j), 3B (i, j + 1)
As described above, the column drive lines and the row drive lines are represented by the intersection coordinates. For example, 3G (i, j) is a green element 3G, which means that the element is at the intersection of the column drive line i and the row selection line j.

4G (i), 4R (i), and 4B (i) are the i-th green signal, red signal, and blue signal, respectively.

Further, 51 (i-1), 51 (i), 51 (i + 1) are first drive circuits, and 52 (i-1), 52 (i), 52 (i + 1) are second drive circuits, respectively. Drive the first and second column drive lines having the same number. Regarding these drive circuits,
Of the adjacent red signal 4R (i-1) and red signal 4R (i) are supplied to the second driving circuit (for example, 52 (i-1)), and the second driving circuit (for example, 52 (i)) is also supplied. Green light 4B (i)
And the green signal 4B (i + 1) are supplied. In addition, the first drive circuit (for example, 51 (i)),
Green signal 4G (i), red signal 4R (i), and blue signal 4B (i) having the same number are supplied, and the green signal is zero and the green signal is displayed by the red signal (or blue signal). Then, the gains (γ and b) for the red and blue signals are set so that the brightness of the green element is substantially equal to the brightness that the red element (or blue element) is actually displayed.

The operation of the device configured as described above is as follows. 2 (j) is selected as the row selection line, and the red signal is at level 1.
A case where red is displayed at the position (i, j) will be described. In this case, the level 1 red signal is output to the drive circuit 52 (i-
1), the red element 3R (i−1, j) emits light. At this time, the same red signal is also supplied to the drive circuit 51 (i), so that the green element 3G (i, j) also emits light.
Since the gain of the drive circuit 51 (i) with respect to the red signal is γ, this green element emits light with brightness almost equal to that of the red element 3R (i-1, j).

At this time, if the visual distance is equal to or longer than an appropriate distance (a distance in which green and red are mixed), this light emitting unit emits light with chromaticity R1 in the chromaticity diagram of FIG. 3 as a characteristic of human vision. It looks like they are doing. In addition, since the distribution of the brightness of each element at this time is as shown in FIG. 2A, it seems that the bright spot of chromaticity R1 is in the center of the red element and the green element. In the three primary color system having a chromaticity point equivalent to that of an ordinary television CRT, the point R1 shown in FIG. 3 is in a range that can be regarded as substantially red.
1), 11 (i), and it seems that a red bright spot is displayed at the intersection of the row selection line 3j, and in fact, red is displayed at the position (i, j). It looks like you are.

Also, in order to display red at the position (i−1, j), the red signal 4
Drive circuit 51 (i-1) with R (i-1) as level 1
And a red signal is supplied to 52 (i-1), column drive lines 11 (i-1), 12 (i-) as shown in FIG. 2 (b).
It seems that a red bright spot is displayed at the position (i-1, j) at the intersection of the center of 1) and the row selection line 2 (j). Therefore, looking at the entire screen, when displaying red, not only the red elements but also the green elements appear to emit red light, and it seems that the density of the red elements has increased. Compared with the case, it is possible to display without any interference. This also applies to the case of displaying blue.

Display of colors other than red and blue is almost the same as the conventional method. For example, when yellow is displayed at the position (i, j), the green signal 4G (i) and the red signal 4R (i) of level 1 are supplied when the row selection line 2 (j) is selected. Since the red signal is supplied to the drive circuit 52 (i-1), the red element 3R (i-1, j) emits light, and the level 1 green signal is supplied to the drive circuit 51 (i). The green element 3G (i, j) emits bright light. as a result,
As shown in FIG. 2 (c), the bright green and red colors are mixed and appear to be yellow. At this time, the drive circuit 51
Since the red signal 4R (i) is also supplied to (i) with a gain γ, the green light emission slightly increases from the original brightness of green and becomes slightly greenish yellow, but the change is generally acceptable. It is possible.

In addition, as a sample position of the red and blue signals to be applied to the green element, the method of setting the same position as the green signal for the corresponding green element has been exemplified. possible. Also, there may be some variations in the sample positions of the red and blue signals applied to the red and blue elements, but these do not affect the essence of the present invention, so the detailed details are omitted.

In the above description, in order to simplify the explanation of signal distribution, the case where the elements of the three primary colors are arranged as shown in FIG. 1 has been described. Also, similar signal distribution is possible. That is, in the signal distribution to the green elements in these arrangements, in addition to the original green signal, by applying the color signals to the adjacent red and / or blue elements at an appropriate ratio, the above-mentioned effect can be obtained. can get.

Further, in the above description, the case where the brightness of those elements and the green element are made approximately equal when displaying red or blue has been described, but the ratio of this brightness is the chromaticity points of the original three primary colors, and the reproduction. The optimum value changes depending on the range of chromaticity of the image to be obtained, and it is a subjective opinion that good results can be obtained by selecting the brightness of the green element in the range of 1/2 to 1 of the brightness of the red or blue element. It was confirmed as a result of the experimental evaluation.

〔The invention's effect〕

As described above, according to the present invention, when the red or blue element is made to emit light, the green element is also made to emit light. Therefore, even if the display device has a larger number of green elements than the red or blue element. This has the effect of providing a display that does not cause dot interference.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a display state, FIG. 3 is a diagram showing chromaticity, and FIGS. 4 to 6 are other allocation methods of each color element. FIG. 11,12 ... Column drive line, 2 ... Row selection line, 3G ... Green element, 3R ... Red element, 3B ... Blue element, 51,5
2 …… Drive circuit, 4G …… Green signal, 4R …… Red signal, 4B
...... Blue signal.

Claims (4)

[Claims] 1. Red, blue and green elements are provided, and red,
In a display device in which the number of green elements is larger than that of blue elements, green elements arranged at every other element position on each raster and red arranged alternately at each element position between the green element positions. An element and a blue element, and a control circuit for causing the green element on one side of the element for causing the red element or the blue element to emit light to emit light at a brightness close to that of the element to be emitted when the red element or the blue element emits light. Characteristic display device. 2. Red, blue and green elements are provided, and red,
In a display device in which the number of green elements is larger than that of blue elements, green elements are arranged at every other element position on the raster, and red and blue elements are alternately arranged at the element positions between the green element positions. A first element row and the first element row on the raster adjacent to the first element row;
Arrange the green element at the same position as the element row of
The red and blue element positions have a first element row and a second element row arranged in a state where they do not match, and when the red element or the blue element is made to emit light, the green element on one side of the element to be made to emit light And a control circuit for causing the element to emit light with a brightness close to that of the element to be emitted. 3. Red, blue and green elements are provided, and red,
In a display device in which the number of green elements is larger than that of blue elements, a first element row in which green elements are arranged at every other element position on each raster on every other raster, and the first element row On the raster between and the first
A second element row in which red elements and blue elements are alternately arranged between the green elements of the element row, and a second element row on the raster between the first element rows. A third element row having the same arrangement and arranged in a state where the red and blue elements do not match, and when the red element or the blue element is made to emit light, the green at the right or left position adjacent to the element to be made to emit light A display device comprising a control circuit for causing an element to emit light with a brightness close to that of the element to be emitted. 4. Red, blue and green elements are provided, and red,
In a display device in which the number of green elements is larger than that of blue elements, a green element is arranged at every other element position on every other raster, and a red element is arranged at an element position between the green elements. And a green element at every other element position on each raster on the raster between the element row and the first element row, and at the same element position as the red element of the first element row, A second element row in which a blue element is arranged at an element position between the green elements, and when the red element or the blue element is caused to emit light, the green element on one side of the element to emit the light is caused to emit the light. A control circuit that emits light with brightness close to that of the element Display device.