TWI512357B - Wide dynamic range controllable liquid crystal image sensor - Google Patents
Wide dynamic range controllable liquid crystal image sensor Download PDFInfo
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- TWI512357B TWI512357B TW102122388A TW102122388A TWI512357B TW I512357 B TWI512357 B TW I512357B TW 102122388 A TW102122388 A TW 102122388A TW 102122388 A TW102122388 A TW 102122388A TW I512357 B TWI512357 B TW I512357B
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Description
本發明是有關於一種感測器，特別是指一種寬動態範圍控光液晶影像感測器。The invention relates to a sensor, in particular to a wide dynamic range light control liquid crystal image sensor.
在夜間，人眼可以清楚看到景物，但現有的影像感測器一般無法滿足此需求，使得影像感測器夜間攝影的影像不清楚，在日間，人眼在背光的情況下也可以清楚看到景物，但現有的影像感測器在背光攝影時一般也無法滿足此需求，也就是說，人眼對於亮度的感覺範圍很寬，但現有的影像感測器對於背光景物的亮度範圍卻不夠寬，無法滿足顧客的需求，因此，一種寬動態影像感測器為目前市場所需。At night, the human eye can clearly see the scene, but the existing image sensor generally cannot meet this demand, making the image of the image sensor at night unclear. In the daytime, the human eye can clearly see in the case of backlight. To the scene, but the existing image sensor generally can not meet this demand in backlight photography, that is to say, the human eye has a wide range of brightness perception, but the existing image sensor is not enough for the brightness range of the backlight scene. Wide, unable to meet the needs of customers, therefore, a wide dynamic image sensor is currently required in the market.
而以往的一種寬動態影像感測器是使用非線性(nonlinear)的影像感測器，也就是說該影像感測器中每個像素的負載電阻是使用對數電阻(logarithmic resistor)，配合檢光二極體，當影像感測器感受到不同的亮度時，每個像素有對應的對應電阻，也就是說當亮度大時電阻值小，而亮度小時電阻值大，擷取亮度信號的大小來增加該影像感測器的動態範圍，但前述的缺點在於，因對數電阻對於溫度 過於敏感，還需要另外設計有補償電路，增加成本但仍無法獲得良好的補償效果。In the past, a wide dynamic image sensor uses a non-linear image sensor, that is to say, the load resistance of each pixel in the image sensor is a logarithmic resistor. In the polar body, when the image sensor senses different brightness, each pixel has a corresponding corresponding resistance, that is, when the brightness is large, the resistance value is small, and when the brightness is small, the resistance value is large, and the size of the brightness signal is increased. The dynamic range of the image sensor, but the aforementioned disadvantage is due to the logarithmic resistance to temperature Too sensitive, it is also necessary to design a compensation circuit to increase the cost but still can not get a good compensation effect.
此外，前述的影像處理是擷取多的畫面進行成像(multi-frame imaging)，也就是說是使用多次不同的曝光量，從小到大取得多個畫面，然後再從多個畫面當中選取像素，建構出一個清晰的畫面，使影像感測器的動態範圍加寬，缺點在於，取向的速度較慢且增大的動態範圍有限。In addition, the aforementioned image processing is multi-frame imaging, that is, multiple different exposures are used, and multiple images are taken from small to large, and then pixels are selected from among multiple images. A clear picture is constructed to widen the dynamic range of the image sensor. The disadvantage is that the orientation is slower and the dynamic range is increased.
因此，本發明之目的，即在提供一種品質佳的寬動態範圍控光液晶影像感測器。Accordingly, it is an object of the present invention to provide a wide dynamic range light control liquid crystal image sensor of good quality.
於是本發明寬動態範圍控光液晶影像感測器，包含一個影像感測模組、一個控光液晶層、一個亮度驅動電路及一個掃描驅動電路。該影像感測模組包括一個入光面，該影像感測模組包括多數個像素，該控光液晶層設置於該影像感測模組的入光面，該控光液晶層包括多數個對應該等像素的液晶胞，該寬動態範圍控光液晶影像感測器受光強時，該控光液晶層的穿透率低，該寬動態範圍控光液晶影像感測器受光弱時，該控光液晶層的穿透率高，該亮度驅動電路用於將時序信號的亮度信號與水平同步信號輸入至該控光液晶層，該掃描驅動電路用於將時序信號的時脈與垂直同步信號輸入至該控光液晶層。Therefore, the wide dynamic range light control liquid crystal image sensor of the invention comprises an image sensing module, a light control liquid crystal layer, a brightness driving circuit and a scan driving circuit. The image sensing module includes a light incident surface, and the image sensing module includes a plurality of pixels. The light control liquid crystal layer is disposed on a light incident surface of the image sensing module, and the light control liquid crystal layer includes a plurality of pairs. The liquid crystal cell of the pixel should be equal. When the wide dynamic range light control liquid crystal image sensor receives light, the transmittance of the light control liquid crystal layer is low, and when the wide dynamic range light control liquid crystal image sensor is weak, the control The transmittance of the light liquid crystal layer is used to input a luminance signal and a horizontal synchronization signal of the timing signal to the light control liquid crystal layer, and the scan driving circuit is configured to input the clock and vertical synchronization signals of the timing signal. To the light control liquid crystal layer.
本發明所述的寬動態範圍控光液晶影像感測器，其中，該影像感測模組是CCD影像感測模組。The wide dynamic range light control liquid crystal image sensor of the present invention, wherein the image sensing module is a CCD image sensing module.
本發明所述的寬動態範圍控光液晶影像感測 器，其中，該影像感測模組是CMOS影像感測模組。Wide dynamic range light control liquid crystal image sensing according to the present invention The image sensing module is a CMOS image sensing module.
本發明所述的寬動態範圍控光液晶影像感測器，其中，該控光液晶層為扭轉向列型液晶。The wide dynamic range light control liquid crystal image sensor of the present invention, wherein the light control liquid crystal layer is a twisted nematic liquid crystal.
本發明所述的寬動態範圍控光液晶影像感測器，其中，該控光液晶層為超扭轉向列液晶。The wide dynamic range light control liquid crystal image sensor of the present invention, wherein the light control liquid crystal layer is a super twisted nematic liquid crystal.
本發明之功效在於透過該亮度驅動電路以及該掃描驅動電路控制該控光液晶層的穿透率，使該控光液晶層達到該寬動態範圍控光液晶影像感測器受光強時穿透率低，該寬動態範圍控光液晶影像感測器受光弱時，該控光液晶層的穿透率高，而提高該寬動態範圍控光液晶影像感測器的動態範圍，確實達到發明目的。The effect of the present invention is to control the transmittance of the light control liquid crystal layer through the brightness driving circuit and the scan driving circuit, so that the light control liquid crystal layer reaches the light transmittance of the wide dynamic range light control liquid crystal image sensor. When the wide dynamic range light control liquid crystal image sensor is weak, the transmittance of the light control liquid crystal layer is high, and the dynamic range of the wide dynamic range light control liquid crystal image sensor is improved, which truly achieves the object of the invention.
1‧‧‧影像感測模組1‧‧‧Image Sensing Module
11‧‧‧入光面11‧‧‧Into the glossy surface
12‧‧‧像素12 ‧ ‧ pixels
2‧‧‧控光液晶層2‧‧‧Light-control liquid crystal layer
21‧‧‧液晶胞21‧‧‧ liquid crystal cell
3‧‧‧亮度控制電路3‧‧‧Brightness control circuit
4‧‧‧掃描控制電路4‧‧‧Scan control circuit
本發明之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中：圖1是一個示意圖，說明本發明寬動態範圍控光液晶影像感測器的較佳實施例；圖2是一個示意圖表，說明本較佳實施例的穿透率與電壓的關係圖；及圖3是一個方塊示意圖，說明本較佳實施例的元件作動關係。Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a schematic diagram illustrating a preferred embodiment of the wide dynamic range light control liquid crystal image sensor of the present invention; 2 is a schematic diagram showing the relationship between the transmittance and the voltage of the preferred embodiment; and FIG. 3 is a block diagram showing the component actuation relationship of the preferred embodiment.
參閱圖1、圖2與圖3，本發明寬動態範圍控光液晶影像感測器之較佳實施例包含一個影像感測模組1、一 個控光液晶層2、一個亮度驅動電路3及一個掃描驅動電路4。Referring to FIG. 1 , FIG. 2 and FIG. 3 , a preferred embodiment of the wide dynamic range light control liquid crystal image sensor of the present invention comprises an image sensing module 1 . A light control liquid crystal layer 2, a brightness driving circuit 3 and a scan driving circuit 4.
該影像感測模組1包括一個入光面11，該影像感測模組1包括多數個像素12，其中，該影像感測模組1是CCD影像感測模組1，或是CMOS影像感測模組1。The image sensing module 1 includes a light incident surface 11 , and the image sensing module 1 includes a plurality of pixels 12 , wherein the image sensing module 1 is a CCD image sensing module 1 or a CMOS image sense. Test module 1.
該控光液晶層2設置於該影像感測模組1的入光面11，該控光液晶層2包括多數個對應該等像素12的液晶胞21。The light control liquid crystal layer 2 is disposed on the light incident surface 11 of the image sensing module 1 , and the light control liquid crystal layer 2 includes a plurality of liquid crystal cells 21 corresponding to the pixels 12 .
本較佳實施例利用控光液晶層2增加該影像感測模組1的動態範圍，該寬動態範圍控光液晶影像感測器受光強時，該控光液晶層2的穿透率低，該寬動態範圍控光液晶影像感測器受光弱時，該控光液晶層2的穿透率高，藉此提高該影像感測模組1的動態範圍，該控光液晶層2的透光特性如圖2所示。The preferred embodiment uses the light control liquid crystal layer 2 to increase the dynamic range of the image sensing module 1. When the wide dynamic range light control liquid crystal image sensor receives light, the transmittance of the light control liquid crystal layer 2 is low. When the wide dynamic range light control liquid crystal image sensor is weak, the transmittance of the light control liquid crystal layer 2 is high, thereby improving the dynamic range of the image sensing module 1, and the light control liquid crystal layer 2 is transparent. The characteristics are shown in Figure 2.
該控光液晶層2由偏光板、液晶、TFT玻璃與偏光板組成，其中，該控光液晶層2為扭轉向列型液晶(TN，twisted nematic liquid crystal)，或是超扭轉向列液晶(STN，Super-twisted nematic liquid crystal)。The light control liquid crystal layer 2 is composed of a polarizing plate, a liquid crystal, a TFT glass and a polarizing plate, wherein the light control liquid crystal layer 2 is a twisted nematic liquid crystal (TN) or a super twisted nematic liquid crystal (TN). STN, Super-twisted nematic liquid crystal).
該亮度驅動電路3用於將時序信號的亮度信號與水平同步信號輸入至該控光液晶層2。The brightness driving circuit 3 is for inputting a luminance signal and a horizontal synchronization signal of the timing signal to the light control liquid crystal layer 2.
該掃描驅動電路4用於將時序信號的時脈(clock)與垂直同步信號輸入至該控光液晶層2。The scan driving circuit 4 is configured to input a clock and a vertical sync signal of the timing signal to the light control liquid crystal layer 2.
綜上所述，本發明之功效在於透過該亮度驅動電路3以及該掃描驅動電路4控制該控光液晶層2的穿透 率，使該控光液晶層2達到該寬動態範圍控光液晶影像感測器受光強時穿透率低，該寬動態範圍控光液晶影像感測器受光弱時，該控光液晶層2的穿透率高，而提高該寬動態範圍控光液晶影像感測器的動態範圍，故確實能達成本發明之品質佳目的。In summary, the effect of the present invention is to control the penetration of the light control liquid crystal layer 2 through the brightness driving circuit 3 and the scan driving circuit 4. Rate, the transmittance of the light-control liquid crystal layer 2 to the wide dynamic range light-control liquid crystal image sensor is low, and the light-control liquid crystal layer 2 is controlled when the wide dynamic range light-control liquid crystal image sensor is weak. The penetration rate is high, and the dynamic range of the wide dynamic range light control liquid crystal image sensor is improved, so that the quality of the invention can be achieved.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.
1‧‧‧影像感測模組1‧‧‧Image Sensing Module
11‧‧‧入光面11‧‧‧Into the glossy surface
12‧‧‧像素12 ‧ ‧ pixels
2‧‧‧控光液晶層2‧‧‧Light-control liquid crystal layer
21‧‧‧液晶胞21‧‧‧ liquid crystal cell
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| TW102122388A TWI512357B (en) | 2013-06-24 | 2013-06-24 | Wide dynamic range controllable liquid crystal image sensor |
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| TWI512357B true TWI512357B (en) | 2015-12-11 |
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Citations (5)
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|---|---|---|---|---|
| TW548451B (en) * | 1999-04-23 | 2003-08-21 | Ind Tech Res Inst | Integrated high resolution image sensor and display on an active matrix array |
| US6784949B1 (en) * | 1999-03-11 | 2004-08-31 | Sharp Kabushiki Kaisha | Active matrix substrate, method of manufacturing the same, and image sensor incorporating the same |
| JP2009042676A (en) * | 2007-08-10 | 2009-02-26 | Tpo Displays Corp | Display device |
| JP4759511B2 (en) * | 2004-04-19 | 2011-08-31 | 株式会社日立製作所 | Imaging function integrated display device |
| TWI397876B (en) * | 2007-11-26 | 2013-06-01 | Japan Display West Inc | Display device and electronic apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6784949B1 (en) * | 1999-03-11 | 2004-08-31 | Sharp Kabushiki Kaisha | Active matrix substrate, method of manufacturing the same, and image sensor incorporating the same |
| TW548451B (en) * | 1999-04-23 | 2003-08-21 | Ind Tech Res Inst | Integrated high resolution image sensor and display on an active matrix array |
| JP4759511B2 (en) * | 2004-04-19 | 2011-08-31 | 株式会社日立製作所 | Imaging function integrated display device |
| JP2009042676A (en) * | 2007-08-10 | 2009-02-26 | Tpo Displays Corp | Display device |
| TWI397876B (en) * | 2007-11-26 | 2013-06-01 | Japan Display West Inc | Display device and electronic apparatus |
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