JP2017037274A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify conversion processing on an image signal to be treated and display an image with less power consumption.SOLUTION: A liquid crystal display comprises: a color filter that has R and B filters arranged separated from each other in adjacent two-line unit in the Bayer array where the component ratio of R, G, and B is 1:2:1; first signal lines S11, S13, S15, and S17 that connect pixels corresponding to the G filters in adjacent two-line unit of the color filter in a zigzag manner; second signal lines S12 and S16 that connect pixels corresponding to the R filters in adjacent two-line unit of the color filter in a zigzag manner; and third signal lines S14 and S18 that connect pixels corresponding to the B filters in adjacent two-line unit of the color filter in a zigzag manner.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid crystal display device suitable for displaying image data acquired by photographing with a solid-state imaging device such as a CCD (Charge Coupled Device).

  A solid-state imaging device such as a CCD or a CMOS image sensor is provided with a color filter corresponding to a pixel. Regarding this color filter, a technique for adjusting the optical sensitivity for each color (for example, Patent Document 1), a technique having a flat upper surface configuration without overlapping portions of patterns for each color (for example, Patent Document 2), and the like have been proposed. ing.

JP 2008-219346 A JP 2008-268278 A

  FIG. 6A shows a pixel configuration of a Bayer array that is generally used in a color filter of a solid-state imaging device. As shown in FIG. 4A, a color pixel PXi is divided into four primary color pixels (R (red pixel): G (G1, G2) (green pixel): B (blue pixel) = 1: 2: 1) Subpixels), and the two pixels G1 and G2 are arranged diagonally. This is because the human eye has higher sensitivity to luminance than chromaticity, and the G component has significantly higher luminance than the R and B components. .

  FIG. 6B illustrates a pixel configuration of a color filter used for a display device such as a liquid crystal display element. As shown in FIG. 4B, one pixel PXo is configured by three primary color pixels (sub-pixels) of R: G: B = 1: 1: 1.

  Therefore, the image signal obtained by the solid-state imaging device in FIG. 6A is subjected to signal conversion processing for display having a different pixel configuration and then supplied to a driving circuit of the display device.

  Therefore, as shown in FIG. 7, on the output side of the liquid crystal display device or the like, a signal that is executed between the input device / output device of the image signal by having a color filter with a Bayer arrangement as in the solid-state imaging device. A method for simplifying the conversion process can be considered.

  In this case, among the segment (signal) lines “1” to “8” extending in the vertical (Y) direction, the odd number signal lines “1”, “3”, “5”, and “7” have G filters and B While the filters are alternately arranged, the G filters and the R filters are alternately arranged on the even segment lines “2”, “4”, “6”, and “8”.

  Note that the common (scanning) line extending in the horizontal (X) direction in the figure is assumed to be the same as that of a general active matrix type liquid crystal display device, and illustration and description of driving thereof are omitted. Shall.

  By the way, in image display, a specific primary color is frequently displayed in a full gradation value in at least a part of the screen.

  FIG. 8 is a diagram illustrating signal waveforms given to the segment lines “1” to “8” when only the green color is used as a full gradation value and the entire pixel range shown in FIG. 7 is displayed in one green color. . As shown in the figure, the voltage “+ VD” or “−VD” corresponding to the full gradation value is alternately applied to only the pixel corresponding to the G filter in the signal to any segment line.

  When display driving is performed with such a pixel configuration, since the current consumption is proportional to the frequency, a problem arises in that the current consumption increases as the image signal becomes higher in frequency.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a liquid crystal display device capable of displaying an image with less power consumption while simplifying a conversion process for a handled image signal. Is to provide.

The liquid crystal display device according to one embodiment of the present invention has a Bayer array in which the composition ratio of R (red): G (green): B (blue) is 1: 2: 1, and R and B in units of two adjacent lines. Are separated from each other, a first signal line that zigzags the pixels corresponding to the G filter in units of two adjacent lines of the color filter, and the adjacent two of the color filters. A second signal line that connects pixels corresponding to the R filter in a line unit in a zigzag manner, and a third signal that connects pixels corresponding to the B filter in a zigzag unit in two adjacent line units in the color filter. And a line.
A liquid crystal display device according to another embodiment of the present invention includes a color filter with a Bayer arrangement in which a composition ratio of R (red): G (green): B (blue) is 1: 2: 1; The first signal line that connects the pixels corresponding to the G filter in zigzag in units of two adjacent lines, and the pixels corresponding to the R filter and B filter in units of two adjacent lines of the color filter are alternately arranged. And a second signal line connected in a zigzag manner.

  According to the present invention, it is possible to display an image with less power consumption while simplifying a conversion process for an image signal to be handled.

1 is a diagram showing a connection configuration of mainly color filters and corresponding pixels of a liquid crystal display device according to a first embodiment of the present invention. The figure which shows the voltage waveform applied to a signal wire | line when displaying the image of green of a whole surface with the liquid crystal display device which concerns on the same embodiment. The figure which shows the connection structure of the color filter and corresponding pixel mainly of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. The figure which shows the voltage waveform applied to a signal wire | line when displaying the image of green of a whole surface with the liquid crystal display device which concerns on the same embodiment. The figure which shows the voltage waveform applied to a signal wire | line when displaying the image of red one color on the whole surface with the liquid crystal display device which concerns on the same embodiment. The figure which shows the pixel structure of a Bayer array used with the color filter of a general solid-state image sensor, and the pixel structure of the color filter of a liquid crystal display element. FIG. 6 is a diagram illustrating a pixel configuration and a connection example when a Bayer arrangement is adopted for a color filter of a liquid crystal display device. FIG. 8 is a diagram illustrating a voltage waveform applied to a signal line when an entire green image is displayed on the liquid crystal display device of FIG. 7.

  Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and ratios of the drawings are not necessarily the same as actual ones. Further, even when the same portion is represented between the drawings, the dimensional relationship and ratio may be represented differently. In particular, some embodiments shown below exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of the components. It is not specified. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.

[1] First embodiment
[1-1] Configuration of the liquid crystal display device 10
FIG. 1 is a diagram mainly illustrating a connection configuration of color filters and corresponding pixels in the liquid crystal display device 10 according to the first embodiment.

  As shown in the figure, in the present embodiment, the color filters are configured in a Bayer array in which the composition ratio of R (red): G (green): B (blue) is 1: 2: 1. In the same figure, each pixel is connected by a common (scanning) line (not shown) extending in the horizontal (X) direction, and a segment (in the vertical (Y) direction extending in units of two adjacent lines of the color filter ( The pixel is connected in a zigzag pattern so that the signal line corresponds to the color filter of the same color.

  That is, in the vertical and horizontal directions, for the G filter arranged in a staggered pattern with one pixel skipped, as shown by signal lines S11, S13, S15, S17,. A signal line of each pixel is connected in a zigzag manner as the first signal line.

  On the other hand, the R filter and the B filter are sequentially arranged on the color filter so that the distribution is completely separated in units of two lines, and the signal lines are connected to the pixels in a zigzag manner in the units of the two lines. And The signal lines S12, S16,... Corresponding to the R filter are the second signal lines, and the signal lines S14, S18,.

  As a result, the signal lines S11 to S18, respectively, are connected so as to connect the color filters R, G, B of the same color extending in the longitudinal (Y) direction while maintaining the configuration of the color filters in the Bayer arrangement as a whole. In this configuration, pixels of the same color are connected in a zigzag pattern. These signal lines S11 to S18 can be formed in a pattern on the same plane without crossing each other.

  By adopting such a color filter configuration, a slightly irregular Bayer array color filter in which the positions of the R filter and the B filter other than the G filter are alternately switched in the horizontal (X) direction can be obtained. The liquid crystal display device 10 used is realized.

  Therefore, for example, the display on the liquid crystal display device 10 is executed as it is with only a simple conversion process for regularly replacing a part of R data and B data for RAW data obtained by a solid-state image sensor of a digital camera. Can do.

[1-2] Operation of the liquid crystal display device 10
The operation of the liquid crystal display device 10 configured as described above will be described.
FIG. 2 is a diagram exemplifying signal waveforms applied to the signal lines S11 to S18 when only green is displayed with full gradation values and the entire pixel range shown in FIG. 1 is displayed with one green color. As shown in the figure, the voltage “+ VD” or “−VD” corresponding to the full gradation value is alternately applied to the signal lines S11, S13, S15, and S17 corresponding to the pixel G at an appropriate timing as shown in the figure. Will be.

  On the other hand, the signal lines S12 and S16 corresponding to the pixel R and the signal lines S14 and S18 corresponding to the pixel B each have a voltage of “0” corresponding to the “0 (zero)” gradation.

  Since all of R, G, and B correspond to only pixels of the same color component, the signal lines are particularly suitable for displaying at least one color of R, G, and B in full gradation. The voltage waveform applied to can be reduced in frequency.

  For example, in the case of applying a full gradation value voltage on the same signal line, when the timing of inverting the polarity is a unit corresponding to 12 pixels, the voltage to the signal lines 1 to 8 shown in FIG. In contrast, in FIG. 2, the frequency of the voltage applied to the signal lines S11, S13, S15, and S17 can be reduced to 1/12, and the power consumption for the liquid crystal display device 10 can be sufficiently reduced by that amount.

  When such full-surface full gradation display is performed, the polarity of the voltage applied to the corresponding signal line is set for each of the four signal lines, with the signal lines S11 to S14 and the signal lines S15 to S16 as one unit. By inversion, flicker can be reduced.

[2] Second embodiment
[2-1] Configuration of the liquid crystal display device 20
FIG. 3 is a diagram mainly illustrating a connection configuration of a color filter and corresponding pixels of the liquid crystal display device 20 according to the second embodiment.

  As shown in the figure, in the present embodiment, the color filters are configured in a Bayer array in which the composition ratio of R (red): G (green): B (blue) is 1: 2: 1. In the same figure, each pixel is connected by a common (scanning) line (not shown) extending in the horizontal (X) direction, and a segment (in the vertical (Y) direction extending in units of two adjacent lines of the color filter ( The pixel is connected in a zigzag pattern so that the signal line corresponds to the color filter of the same color.

  That is, for the G filter arranged in a staggered pattern in both the vertical and horizontal directions by skipping one pixel, as shown by signal lines S21, S23, S25, S27,. A signal line of each pixel is connected in a zigzag manner as the first signal line.

  On the other hand, the R filter and the B filter are connected in the same color for each common (scanning) line. On the signal line, the R filter and the B filter are alternately zigzag in two adjacent lines. Connected configuration. The signal lines S22, S24, S26, and S28 corresponding to these R and B filters are the second signal lines.

  As a result, the signal lines S21 and S23 which are the first signal lines are connected so as to connect the color filters G of the same color extending in the longitudinal (Y) direction while maintaining the configuration of the color filters in the Bayer arrangement as a whole. , S25, S27 and zigzag connection with the second signal lines S22, S24, S26, and S28 so that the other color filters R and B are alternately connected. These signal lines S21 to S28 can be formed in a pattern on the same plane without crossing each other.

  Therefore, for example, display on the liquid crystal display device 20 can be executed as it is without performing any conversion process on the data arrangement for the RAW data obtained by the solid-state image sensor of the digital camera.

[2-2] Operation of the liquid crystal display device 20
The operation of the liquid crystal display device 20 configured as described above will be described.
FIG. 4 exemplifies signal waveforms applied to the signal lines S21 to S28 when only green is displayed with full gradation values and the entire pixel range of the liquid crystal display device 20 shown in FIG. 3 is displayed with one green color. FIG. As shown in the figure, the voltage “+ VD” or “−VD” corresponding to the full gradation value is alternately applied to the signal lines S21, S23, S25, S27 corresponding to the pixel G at an appropriate timing as shown in the figure. Will be.

  On the other hand, the signal lines S22, S24, S26, and S28 corresponding to the pixels R and B each have a voltage of “0” corresponding to the “0 (zero)” gradation.

  Regarding G, since one signal line corresponds to only pixels of the same color component, the voltage waveform applied to the signal line can be reduced in frequency especially when green is displayed in full gradation.

  For example, in the case of applying a full gradation value voltage on the same signal line, when the timing of inverting the polarity is a unit corresponding to 12 pixels, the voltage to the signal lines 1 to 8 shown in FIG. In contrast, in FIG. 2, the frequency of the voltage applied to the signal lines S21, S23, S25, and S27 can be reduced to 1/12, and the power consumption for the liquid crystal display device 10 can be sufficiently reduced by that amount.

  When such full-scale full gradation display is performed, the signal lines S21 and S22, the signal lines S23 and S24, the signal lines S25 and S26, and the signal lines S27 and S28 are used as a unit, and each of the two signal lines is supported. By reversing the polarity of the voltage applied to the signal line, flicker can be reduced.

  FIG. 5 shows the signal lines S21 to S28 in the case where only red is displayed with full gradation values and the entire pixel range of the liquid crystal display device 20 shown in FIG. It is a figure which illustrates the signal waveform given to. As shown in the drawing, the voltage “0” corresponding to the “0 (zero)” gradation is applied to the signal lines S21, S23, S25, and S27 corresponding to the pixel G as shown in the figure.

  On the other hand, the signal lines S22, S24, S26, and S28 corresponding to the pixels R and B have the voltage “+ VD” or “−VD” corresponding to the full gradation value only for the pixels corresponding to the R filters that are alternately present. Will be applied.

  That is, with respect to R, since one signal line is composed of R and B pixels of two color components alternately arranged, particularly when any one of the color components is displayed in full gradation, the above-mentioned The voltage waveform to the signal lines 1 to 8 shown in FIG.

  As described above, when the full-tone display of either R or B is performed on the signal line to the pixel in which R and B are alternately present, the voltage applied to the signal lines 1 to 8 shown in FIG. It is necessary to apply a voltage having a waveform substantially equivalent to the waveform.

  However, when the entire pixel range of the liquid crystal display device 20 is displayed in green, power consumption can be greatly reduced. Therefore, the power consumption of the liquid crystal display device 20 can be reliably reduced as a whole as compared with the liquid crystal display device having the configuration described in FIG. Consumption can be reduced.

  In the Bayer color filter, as described above, the composition ratio of R (red): G (green): B (blue) pixels (= sub-pixels) is 1: 2: 1. Therefore, the R, G, B primary color filters have the same chromaticity at 1: 1: 1, and the total color when these three primary colors are respectively displayed with full gradation values is white. In this case, the color balance as one color pixel in which the four sub-pixels are combined is out of order, and the G color component is excessive.

  Therefore, in the liquid crystal display devices 10 and 20, the chromaticity when the G sub-pixel is displayed with the full gradation value is about half that when the R and B sub-pixels are displayed with the full gradation value. As described above, it is assumed that the color balance has been adjusted in advance.

  In this case, a method of physically reducing the chromaticity of the G filter in the color filters of the liquid crystal display devices 10 and 20 and a voltage signal (or gradation) applied to the signal line corresponding to the G pixel. If adjustment is current control to the pixel TFT, a method of reducing a peak value of a current signal), a method of combining these methods, or the like can be considered.

  The present invention is not limited to the above embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiments, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.

10, 20 ... Liquid crystal display device,
R, G, B: Color filters and pixel electrodes located immediately below them,
S11 to S18, S21 to S28 ... segment (signal) lines.

Claims (4)

A color filter in which the composition ratio of R (red): G (green): B (blue) is 1: 2: 1, and the R and B filters are separated and arranged in units of two adjacent lines; ,
A first signal line for zigzag connecting pixels corresponding to the G filter in units of two adjacent lines of the color filter;
A second signal line for zigzag connecting pixels corresponding to the R filter in units of two adjacent lines of the color filter;
A liquid crystal display device comprising: a third signal line for zigzag-connecting pixels corresponding to the B filter in units of two adjacent lines of the color filter.   2. The liquid crystal display device according to claim 1, wherein the first to third signal lines are driven by inverting the polarity in units of four adjacent lines. A Bayer array color filter in which the composition ratio of R (red): G (green): B (blue) is 1: 2: 1;
A first signal line for zigzag connecting pixels corresponding to the G filter in units of two adjacent lines of the color filter;
A liquid crystal display device comprising: a second signal line that alternately connects pixels corresponding to the R filter and the B filter in zigzag units in units of two adjacent lines of the color filter.   4. The liquid crystal display device according to claim 3, wherein the first and second signal lines are driven by inverting the polarity in units of two adjacent lines.