JP2006003672A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a bright display screen when performing reflective display, in a display apparatus in which a transmitting region and a reflective region are provided. <P>SOLUTION: The display screen is divided into a main screen 1 and a sub-screen 2. In the sub-screen 2 which does not often require color displaying, a ratio of a colored layer area to a pixel area in the reflective region 11 in each pixel is made smaller than the ratio of the colored layer area to the pixel area in each pixel of the main screen 1 and thereby, higher reflectivity by just an amount that the ratio of the colored layer is less in the sub-screen 2, is obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device having a transmissive area and a reflective area on a display screen.

  Thin and lightweight display devices have been widely used in word processors, personal computers, televisions, monitors, PDAs (Personal Digital Assistants), mobile phones, and the like.

  In particular, a liquid crystal display device including a thin film transistor (TFT) for each pixel has been actively developed because it is easy to reduce the thickness, weight, and power consumption.

  Liquid crystal display devices used in mobile terminals such as PDAs and mobile phones are required to further reduce power consumption. As a display device that realizes low power consumption, in order to reduce the power consumption of the backlight device, a reflection method that uses external light for display, or switching between light from the backlight and external light is used. The semi-transmission method is used (see Patent Document 1). In particular, development of a transflective display device having both a reflective region and a transmissive region in a pixel is in progress.

By the way, in a display device that performs color display, each pixel is colored in one of red (R), green (G), and blue (B) by a colored layer. In a transflective display device including a reflective region and a transmissive region in a pixel, a colored layer is disposed in both the reflective region and the transmissive region.
JP 2002-303863 A

  However, when the colored layer is arranged in the reflection region in this way, the reflectance is lowered, and the display screen may become dark at the time of reflection display.

  The present invention has been made in view of the above, and an object of the present invention is to provide a display device that includes a reflective region and a transmissive region for each pixel so that a bright display screen can be obtained during reflective display. It is in.

  The display device according to the first aspect of the present invention includes a main screen provided with a colored layer for each pixel, a sub screen provided with both a reflective region and a transmissive region for each pixel, and a color provided for each pixel on the sub screen. And a ratio of the colored layer area in the reflective region in each pixel of the sub-screen to the pixel area is smaller than a ratio of the colored layer area in each pixel of the main screen to the pixel area.

  In the present invention, in the sub-screen that does not require much color display, the ratio of the colored layer area in the reflective region of each pixel to the pixel area is higher than the ratio of the colored layer area in each pixel of the main screen to the pixel area. By reducing the number, it is possible to obtain a high reflectance at the time of reflective display by the amount of the colored layer on the sub-screen.

  The display device according to the second aspect of the present invention is characterized in that the colored layer is excluded from the reflection region in each pixel of the sub-screen.

  In the present invention, by eliminating the colored layer from the reflection area of the sub-screen, the light reflectance in the reflection area is maximized.

  With the display device according to the present invention, a bright display screen can be obtained even during reflective display.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a display screen in a display device according to an embodiment. The display screen shown in FIG. 1 has a main screen 1 and a sub screen 2. Here, the main screen 1 and the sub-screen 2 are assumed to be semi-transmissive types in which each pixel has both a reflective region and a transmissive region. The main screen 1 may be a transmissive type in which each pixel has only a transmissive region.

  Here, for example, a display screen of a mobile phone is assumed. That is, the sub-screen 2 is a screen that does not require much color display only to indicate the reception state of radio waves and the remaining amount of battery.

  FIG. 2 is an enlarged plan view showing the configuration of the sub screen 2, and FIG. 3 is an enlarged plan view showing the configuration of the main screen 1. Each pixel in the main screen 1 and the sub screen 2 transmits light from a reflective region 11 including a reflective electrode that reflects external light incident from the surface of the display device, and a backlight disposed on the back surface of the display device. A transmissive region 12 having a transmissive electrode is provided.

  In each pixel of the main screen 1, both the reflective region 11 and the transmissive region 12 are either a red (R) colored layer 14 a, a green (G) colored layer 14 b, or a blue (B) colored layer 14 c. The colored layer is colored.

  On the other hand, in each pixel of the sub-screen 2, the ratio of the colored layer area in the reflective region 11 to the pixel area is smaller than the ratio of the colored layer area in each pixel of the main screen 1 to the pixel area. More specifically, in the example of FIG. 2, in each pixel of the sub screen 2, any one of the red colored layer 13 a, the green colored layer 13 b, and the blue colored layer 13 c is arranged only in the transmissive region 12 and reflected. The colored layer is removed from the region 11.

  Therefore, according to the present embodiment, the display screen is divided into the main screen 1 and the sub screen 2, and in the sub screen 2 that does not require much color display, the pixels of the color layer area in the reflection region 11 in each pixel. Since the ratio with respect to the area is smaller than the ratio with respect to the pixel area of the colored layer area in each pixel of the main screen 1, the sub screen 2 can obtain a higher reflectivity by the smaller proportion of the colored layer. A bright screen can be obtained during reflection display.

  In particular, by removing the colored layer from the reflective area 11 in the sub-screen 2, the light reflectance in the reflective area 11 is maximized, so that the sub-screen 2 can obtain a bright screen during reflective display.

It is a figure which shows the structure of the display screen in the display apparatus of one Embodiment. It is an enlarged plan view which shows the structure of the sub screen in the said display apparatus. It is an enlarged plan view which shows the structure of the main screen in the said display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main screen, 2 ... Sub screen 11 ... Reflection area | region, 12 ... Transmission area 13a, 13b, 13c ... Colored layer 14a, 14b, 14c ... Colored layer

Claims (2)

A main screen with a colored layer for each pixel;
A sub-screen with both reflective and transmissive areas for each pixel;
A colored layer provided for each pixel on the sub-screen,
A display device, wherein a ratio of a colored layer area in a reflective region in each pixel of a sub screen to a pixel area is smaller than a ratio of a colored layer area in each pixel of a main screen to the pixel area. The display device according to claim 1, wherein the colored layer is excluded from the reflection region in each pixel of the sub-screen.