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Transflective liquid crystal display device

A display device, transflective technology, applied in static indicators, nonlinear optics, instruments, etc., can solve problems such as low contrast and poor image quality

Inactive Publication Date: 2007-09-12
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Now, considering specifically reflective LCD devices as opposed to transflective devices, their dependence on ambient light can lead to problems such as poorer image quality, e.g., lower contrast, in lower ambient light conditions

Method used

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  • Transflective liquid crystal display device
  • Transflective liquid crystal display device
  • Transflective liquid crystal display device

Examples

Experimental program
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Embodiment Construction

[0039]FIG. 1 is a simplified schematic diagram of a transflective LCD device according to a first embodiment. The transflective LCD device includes a transflective LCD panel 3 and a photodiode 5 . The transflective LCD panel includes a large number of transmissive pixels / reflective sub-pixels 2 arranged in an array of rows and columns, in this example 150 rows×500 columns (for clarity, only one of them is shown in FIG. part). Each transmissive pixel / reflective sub-pixel 2 comprises a transmissive pixel surrounded by a reflective sub-pixel, which will be described in more detail below with reference to FIGS. 2-5 . The operation of the transflective LCD panel 3, especially the driving of the transmissive pixels and reflective sub-pixels, is controlled to some extent according to the ambient light level sensed by the photodiode 5, which will be described below with reference to FIGS. 5-7 described in more detail.

[0040] 2 is a schematic perspective view (not to scale) of a t...

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PUM

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Abstract

A transfiective display device (1), comprising: an array of transmissive pixels (4) and reflective pixels (12) arranged such that at least one characteristic of an image is different for the image displayed in transmissive mode compared to the image displayed in reflective mode, for example different resolution, or one mode colour and the other mode monochrome, and arranged to switch off a backlight (190) that provides illumination for the transmissive mode responsive to the ambient light level (304) exceeding a threshold level (316). The device may further, or alternatively, be arranged to drive the reflective pixels (12) in an all-black state responsive to the ambient light level (304) falling below the threshold (316). An additional threshold (318) may be used to provide a hysteresis loop (320-321). These arrangements tend to alleviate the effect of mixed transmissive / reflective mode images at medium ambient brightness levels (312) where the brightness level (306) of the reflective mode and the brightness level (308) of the transmissive mode are similar.

Description

field of invention [0001] The present invention relates to liquid crystal display (LCD) devices, and more particularly, the present invention relates to transflective LCD devices. technical background [0002] Transmissive liquid crystal display (LCD) devices and reflective LCD devices have been known for many years. In a transmissive LCD device, a backlight located behind a liquid crystal layer provides light modulated by the liquid crystal layer to provide an image to a user viewing the LCD device. In reflective LCD devices, ambient light falling in front of the reflective LCD device provides light modulated by the liquid crystal layer to provide an image to a user viewing the LCD device. [0003] Recently, a transflective LCD device has been developed. Transflective LCD devices provide a combination of transmissive mode operation using a backlight from behind the liquid crystal layer and reflective mode using ambient light falling in front of the LCD device. [0004] L...

Claims

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Application Information

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IPC IPC(8): G09G3/36G02F1/1335G02F1/13357G02F1/1362
CPCG02F2001/133622G02F2001/133626G09G3/3648G02F2203/34G02F1/133555G09G2320/0626G09G2300/0456G02F1/13624G09G2360/144G02F1/133622G02F1/133626
Inventor 斯蒂芬·J.·巴特斯比大卫·W.·帕克贾森·R.·赫克托约翰·R.·休斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV