Liquid crystal shutter device

Abstract

A liquid crystal shutter device is provided with a liquid crystal cell including a first substrate (1), a second substrate (21), and liquid crystal sandwiched therebetween, pixel electrodes (11, 12) which are signal electrodes and lead-out electrodes (15) provided on the first substrate (1), counter electrodes which are common electrodes facing the pixel electrodes, provided on the second substrate (21), and a plurality of pixel rows (200, 300, 400) which are composed of pixels (2, 3, 4, etc.) formed by overlapped portions of the pixel electrodes and the counter electrodes, and the liquid crystal shutter device controls light applied to a photosensitive member continuously and relatively moving in a direction orthogonal to the pixel rows, in which the counter electrodes are provided separately for the respective pixel rows. Further, an RGB coupling electrode (46) for electrically connecting the counter electrodes of the respective pixel rows is preferably provided.

Description

technical field [0001] The present invention relates to a liquid crystal shutter device that controls light transmittance for each pixel by an electric signal, and particularly relates to an optical printer device that forms a color image on a photosensitive member by controlling the irradiation of light to a photosensitive member that is continuously relatively moved LCD shutter device. technical background [0002] In recent years, image printing apparatuses for printing images displayed on digitally processed monitors on data recording sheets have become widespread. In addition, there are thermal method, inkjet method, laser beam scanning method, liquid crystal shutter method, etc. among the printing methods of image printing apparatuses, however, among them, since the liquid crystal shutter method is suitable for miniaturization, light weight has attracted attention. [0003] The so-called liquid crystal shutter method refers to the method of forming an image on the pho...

AI Technical Summary

Problems solved by technology

[0023] In addition, even for other pixels in the R pixel row, when changing the gray scale of the G pixel row connected to the extraction electrode near the pixel, the transmittance will deviate from the target value in the same way.

Such a deviation becomes a banded image unevenness on the image paper

In addition, the same problem occurs between the second color pixel (G pixel) and the third color pixel (B pixel), and these also become band-like unevenness.

[0024] The banded image is uneven, especially when the pixels of each color are separated. Although it is not obvious when approaching, the unevenness still remains

Moreover, if the pixels of each color are arranged close to each other, color separation becomes difficult and the optical system becomes complicated.

Especially when increasing the amount of light, it is difficult to approach the design due to the large size of the light source

[0025] Namely: in Figure 28 ~ Figure 30 In the conventional liquid crystal shutter device as shown, if a signal is applied to the pixels in the central pixel column, there is a problem that the light transmittance of the pixels in the two outer pixel columns is greatly affected.

[0026] Here, if a matrix-type liquid crystal shutter device is used, the influence of unevenness as described above can be reduced. However, the response speed and contrast decrease, which becomes the cause of increased printing time and decreased image quality.

In addition, it is necessary to make the light sources of various colors close to each other, which will cause interference of light sources and color mixing.

In order to prevent color mixing, even if the light sources are illuminated in sequence, for example, red, green, and blue are illuminated in proportion to the time, compared with printing with the light sources illuminated at the same time, the printing time or the instability of the light intensity of the light sources increases.

Images