Micro display driving substrate for head-mounted display
A micro display driving substrate for a head-mounted display (HMD) terminal unit worn by a user, comprises: an LCoS (Liquid Crystal on Silicon) pixel array configured of one or more first electrode lines arranged while keeping a predetermined distance and one or more second electrode lines arranged to intersect with the first electrode lines while keeping a predetermined distance; a data driving unit for supplying the video data converted into an analog signal to the first electrode lines of the LCoS pixel array; a line driving unit for receiving the video control signal and providing a line selection signal for selecting a second electrode line; and a support control unit for driving a light source needed to display an image.
1. A micro display driving substrate for a head-mounted display (HMD) terminal unit worn by a user, the micro display driving substrate comprising:
an LCoS (Liquid Crystal on Silicone) pixel array configured of one or more first electrode lines arranged while keeping a predetermined distance and one or more second electrode lines arranged to intersect with the first electrode lines while keeping a predetermined distance;
a data driving circuit for supplying the video data converted into an analog signal to the first electrode lines of the LCoS pixel array;
a line driving circuit for receiving the video control signal and providing a line selection signal for selecting a second electrode line so that the video data stored on the first electrode lines for a predetermined time period may be transferred to and stored in a pixel of a relevant line; and
a support control circuit for driving a light source needed to display an image, while controlling an on/off time and brightness of the light source,
the support control circuit including
a lens control circuit for outputting a lens control signal for controlling a lens arranged in the HMD terminal unit,
a light source control circuit for driving a light source needed to display an image, while controlling an on/off time and brightness of the light source,
a differential signal receiver circuit for receiving the video data and the video control signal converted into the differential signals, converting the video data and the video control signal into transistor-transistor logic (TTL) or low voltage complementary metal oxide semiconductor (LVCMOS) signals, and providing the TTL or LVCMOS signals to the data driving circuit and the line driving circuit, respectively,
a serial communication circuit for supporting a protocol needed between the micro display driving substrate and the terminal control circuit through a serial communication,
an audio processing circuit for processing an audio data provided together with the video data and retransmitting the audio data to an audio digital to analog converter and a user,
a radio frequency (RF) communication circuit for wirelessly transmitting and receiving the video data, the video control signal and a control signal for controlling the HMD terminal unit, which are compressed in a certain format,
wherein the support control circuit forms the differential signal receiving circuit, the lens control circuit, the light source control circuit, the serial communication circuit, the audio processing circuit, and the RF communication circuit to be embedded in the micro display driving substrate; and wherein the LCoS pixel array, the data driving circuit, the line driving circuit and the support control circuit to be embedded in the micro display driving substrate.
2. The micro display driving substrate according to claim 1 , wherein the differential signal receiver circuit stores the video data and the video control signal converted into the TTL or the LVCMOS signals for a predetermined time period.
3. The micro display driving substrate according to claim 1 , wherein the differential signal receiver circuit simultaneously provides the video data and the video control signal converted into the TTL or the LVCMOS signals and stored for a predetermined time period to the data driving unit and the line driving unit.